Search

Your search keyword '"Wilkin, John"' showing total 438 results
Start Over Author "Wilkin, John"
438 results on '"Wilkin, John"'

8. Altimetry for the future: Building on 25 years of progress

Author

Abdalla, Saleh, Abdeh Kolahchi, Abdolnabi, Ablain, Michaël, Adusumilli, Susheel, Aich Bhowmick, Suchandra, Alou-Font, Eva, Amarouche, Laiba, Andersen, Ole Baltazar, Antich, Helena, Aouf, Lotfi, Arbic, Brian, Armitage, Thomas, Arnault, Sabine, Artana, Camila, Aulicino, Giuseppe, Ayoub, Nadia, Badulin, Sergei, Baker, Steven, Banks, Chris, Bao, Lifeng, Barbetta, Silvia, Barceló-Llull, Bàrbara, Barlier, François, Basu, Sujit, Bauer-Gottwein, Peter, Becker, Matthias, Beckley, Brian, Bellefond, Nicole, Belonenko, Tatyana, Benkiran, Mounir, Benkouider, Touati, Bennartz, Ralf, Benveniste, Jérôme, Bercher, Nicolas, Berge-Nguyen, Muriel, Bettencourt, Joao, Blarel, Fabien, Blazquez, Alejandro, Blumstein, Denis, Bonnefond, Pascal, Borde, Franck, Bouffard, Jérôme, Boy, François, Boy, Jean-Paul, Brachet, Cédric, Brasseur, Pierre, Braun, Alexander, Brocca, Luca, Brockley, David, Brodeau, Laurent, Brown, Shannon, Bruinsma, Sean, Bulczak, Anna, Buzzard, Sammie, Cahill, Madeleine, Calmant, Stéphane, Calzas, Michel, Camici, Stefania, Cancet, Mathilde, Capdeville, Hugues, Carabajal, Claudia Cristina, Carrere, Loren, Cazenave, Anny, Chassignet, Eric P., Chauhan, Prakash, Cherchali, Selma, Chereskin, Teresa, Cheymol, Cecile, Ciani, Daniele, Cipollini, Paolo, Cirillo, Francesca, Cosme, Emmanuel, Coss, Steve, Cotroneo, Yuri, Cotton, David, Couhert, Alexandre, Coutin-Faye, Sophie, Crétaux, Jean-François, Cyr, Frederic, d’Ovidio, Francesco, Darrozes, José, David, Cedric, Dayoub, Nadim, De Staerke, Danielle, Deng, Xiaoli, Desai, Shailen, Desjonqueres, Jean-Damien, Dettmering, Denise, Di Bella, Alessandro, Díaz-Barroso, Lara, Dibarboure, Gerald, Dieng, Habib Boubacar, Dinardo, Salvatore, Dobslaw, Henryk, Dodet, Guillaume, Doglioli, Andrea, Domeneghetti, Alessio, Donahue, David, Dong, Shenfu, Donlon, Craig, Dorandeu, Joël, Drezen, Christine, Drinkwater, Mark, Du Penhoat, Yves, Dushaw, Brian, Egido, Alejandro, Erofeeva, Svetlana, Escudier, Philippe, Esselborn, Saskia, Exertier, Pierre, Fablet, Ronan, Falco, Cédric, Farrell, Sinead Louise, Faugere, Yannice, Femenias, Pierre, Fenoglio, Luciana, Fernandes, Joana, Fernández, Juan Gabriel, Ferrage, Pascale, Ferrari, Ramiro, Fichen, Lionel, Filippucci, Paolo, Flampouris, Stylianos, Fleury, Sara, Fornari, Marco, Forsberg, Rene, Frappart, Frédéric, Frery, Marie-laure, Garcia, Pablo, Garcia-Mondejar, Albert, Gaudelli, Julia, Gaultier, Lucile, Getirana, Augusto, Gibert, Ferran, Gil, Artur, Gilbert, Lin, Gille, Sarah, Giulicchi, Luisella, Gómez-Enri, Jesús, Gómez-Navarro, Laura, Gommenginger, Christine, Gourdeau, Lionel, Griffin, David, Groh, Andreas, Guerin, Alexandre, Guerrero, Raul, Guinle, Thierry, Gupta, Praveen, Gutknecht, Benjamin D., Hamon, Mathieu, Han, Guoqi, Hauser, Danièle, Helm, Veit, Hendricks, Stefan, Hernandez, Fabrice, Hogg, Anna, Horwath, Martin, Idžanović, Martina, Janssen, Peter, Jeansou, Eric, Jia, Yongjun, Jia, Yuanyuan, Jiang, Liguang, Johannessen, Johnny A., Kamachi, Masafumi, Karimova, Svetlana, Kelly, Kathryn, Kim, Sung Yong, King, Robert, Kittel, Cecile M.M., Klein, Patrice, Klos, Anna, Knudsen, Per, Koenig, Rolf, Kostianoy, Andrey, Kouraev, Alexei, Kumar, Raj, Labroue, Sylvie, Lago, Loreley Selene, Lambin, Juliette, Lasson, Léa, Laurain, Olivier, Laxenaire, Rémi, Lázaro, Clara, Le Gac, Sophie, Le Sommer, Julien, Le Traon, Pierre-Yves, Lebedev, Sergey, Léger, Fabien, Legresy, Benoı̂t, Lemoine, Frank, Lenain, Luc, Leuliette, Eric, Levy, Marina, Lillibridge, John, Liu, Jianqiang, Llovel, William, Lyard, Florent, Macintosh, Claire, Makhoul Varona, Eduard, Manfredi, Cécile, Marin, Frédéric, Mason, Evan, Massari, Christian, Mavrocordatos, Constantin, Maximenko, Nikolai, McMillan, Malcolm, Medina, Thierry, Melet, Angelique, Meloni, Marco, Mertikas, Stelios, Metref, Sammy, Meyssignac, Benoit, Minster, Jean-François, Moreau, Thomas, Moreira, Daniel, Morel, Yves, Morrow, Rosemary, Moyard, John, Mulet, Sandrine, Naeije, Marc, Nerem, Robert Steven, Ngodock, Hans, Nielsen, Karina, Nilsen, Jan Even Øie, Niño, Fernando, Nogueira Loddo, Carolina, Noûs, Camille, Obligis, Estelle, Otosaka, Inès, Otten, Michiel, Oztunali Ozbahceci, Berguzar, P. Raj, Roshin, Paiva, Rodrigo, Paniagua, Guillermina, Paolo, Fernando, Paris, Adrien, Pascual, Ananda, Passaro, Marcello, Paul, Stephan, Pavelsky, Tamlin, Pearson, Christopher, Penduff, Thierry, Peng, Fukai, Perosanz, Felix, Picot, Nicolas, Piras, Fanny, Poggiali, Valerio, Poirier, Étienne, Ponce de León, Sonia, Prants, Sergey, Prigent, Catherine, Provost, Christine, Pujol, M-Isabelle, Qiu, Bo, Quilfen, Yves, Rami, Ali, Raney, R. Keith, Raynal, Matthias, Remy, Elisabeth, Rémy, Frédérique, Restano, Marco, Richardson, Annie, Richardson, Donald, Ricker, Robert, Ricko, Martina, Rinne, Eero, Rose, Stine Kildegaard, Rosmorduc, Vinca, Rudenko, Sergei, Ruiz, Simón, Ryan, Barbara J., Salaün, Corinne, Sanchez-Roman, Antonio, Sandberg Sørensen, Louise, Sandwell, David, Saraceno, Martin, Scagliola, Michele, Schaeffer, Philippe, Scharffenberg, Martin G., Scharroo, Remko, Schiller, Andreas, Schneider, Raphael, Schwatke, Christian, Scozzari, Andrea, Ser-giacomi, Enrico, Seyler, Frederique, Shah, Rashmi, Sharma, Rashmi, Shaw, Andrew, Shepherd, Andrew, Shriver, Jay, Shum, C.K., Simons, Wim, Simonsen, Sebatian B., Slater, Thomas, Smith, Walter, Soares, Saulo, Sokolovskiy, Mikhail, Soudarin, Laurent, Spatar, Ciprian, Speich, Sabrina, Srinivasan, Margaret, Srokosz, Meric, Stanev, Emil, Staneva, Joanna, Steunou, Nathalie, Stroeve, Julienne, Su, Bob, Sulistioadi, Yohanes Budi, Swain, Debadatta, Sylvestre-baron, Annick, Taburet, Nicolas, Tailleux, Rémi, Takayama, Katsumi, Tapley, Byron, Tarpanelli, Angelica, Tavernier, Gilles, Testut, Laurent, Thakur, Praveen K., Thibaut, Pierre, Thompson, LuAnne, Tintoré, Joaquín, Tison, Céline, Tourain, Cédric, Tournadre, Jean, Townsend, Bill, Tran, Ngan, Trilles, Sébastien, Tsamados, Michel, Tseng, Kuo-Hsin, Ubelmann, Clément, Uebbing, Bernd, Vergara, Oscar, Verron, Jacques, Vieira, Telmo, Vignudelli, Stefano, Vinogradova Shiffer, Nadya, Visser, Pieter, Vivier, Frederic, Volkov, Denis, von Schuckmann, Karina, Vuglinskii, Valerii, Vuilleumier, Pierrik, Walter, Blake, Wang, Jida, Wang, Chao, Watson, Christopher, Wilkin, John, Willis, Josh, Wilson, Hilary, Woodworth, Philip, Yang, Kehan, Yao, Fangfang, Zaharia, Raymond, Zakharova, Elena, Zaron, Edward D., Zhang, Yongsheng, Zhao, Zhongxiang, Zinchenko, Vadim, and Zlotnicki, Victor

Published
2021
Full Text
View/download PDF

13. Copyright Renewal of U.S. Books Published in 1932: Reanalyzing Ringer's Study to Determine a More Accurate Renewal Rate for Books

Author

Carlstone, Jamie, Stein, Ayla, Norman, Michael, and Wilkin, John

Abstract

In 1961, Barbara Ringer published "Study No. 31: Renewal of Copyright," where she determined the renewal rate for fiscal year 1932 U.S. publications. In that study, she concludes that the renewal rate for Class A works for FY 1932 was 7 percent. This paper seeks to reassess Ringer's study by analyzing the copyright registrations for 1932 and their renewals published in the "Catalogue of Copyright Entries." This was done to determine a renewal rate specifically for books rather than Class A as a whole, which includes other materials. The analysis determines that the copyright renewal rate for books is actually 26-33 percent, significantly higher than 7 percent claimed by Ringer.

Published
2018
Full Text
View/download PDF

14. The Making of America II Testbed Project: A Digital Library Service Model.

Author

Council on Library and Information Resources, Washington, DC. Digital Library Federation., Hurley, Bernard J., Price-Wilkin, John, Proffitt, Merrilee, and Besser, Howard

Abstract

The Making of America (MoA) Testbed Project, coordinated by the Digital Library Federation, is a multi-phase endeavor. Its purpose is to investigate important issues in the creation of an integrated but distributed digital library of archival materials (i.e., digitized surrogates of primary source materials found in archives and special collections). Drawing on the example of the MoA II Testbed Project, this report examines an object-oriented approach to digital library construction, the collection of structural and administrative metadata, and the development of tools to assist scholars. It is divided into four main parts: (1) the "Executive Summary" provides an overview of the MoA II Testbed Project and describes the content and objectives of the report; (2) Part 1, "Project Background," describes the history of the project and outlines the activities to be undertaken during each of the three phases (i.e., planning, research and production, and dissemination); (3) Part 2, "The MoA II Digital Library Service Model," reviews the technical details of the model for digital library objects and briefly describes the three layers of the project--services, tools, and digital library objects; and (4) Part 3, "Implementing the Service Model," discusses the use of tools in the digital library, presents an overview of structural and administrative metadata, and provides recommendations for the collection of metadata. (Contains 26 references.) (MES)

Published
1999

16. How Large Is the 'Public Domain'? A Comparative Analysis of Ringer's 1961 Copyright Renewal Study and HathiTrust CRMS Data

Author

Wilkin, John P.

Abstract

The 1961 Copyright Office study on renewals, authored by Barbara Ringer, has cast an outsized influence on discussions of the U.S. 1923-1963 public domain. As more concrete data emerge from initiatives such as the large-scale determination process in the Copyright Review Management System (CRMS) project, questions are raised about the reliability or meaning of the Ringer data. A closer examination of both the Ringer study and CRMS data demonstrates fundamental misunderstandings and misrepresentations of the Ringer data, as well as possible methodological issues. Estimates of the size of the corpus of public domain books published in the United States from 1923 through 1963 have been inflated by problematic assumptions, and we should be able to correct mistaken conclusions with reasonable effort.

Published
2017
Full Text
View/download PDF

18. Relationships between family variables and children's mathematical achievement

Author

Wilkin, John Charles, Terrell, Colin, and Huxford, Laura

Subjects
370, LB1603 Secondary Education. High schools, QA Mathematics
Abstract

This study aims to assess the relationship between family variables and specific mathematical achievement in secondary school children. It employs both quantitative and qualitative methods. In the early stages, re-analysis of data from the National Child Development Study (NCDS), (e. g. Fogelman, K. 1983), suggested that previous findings may have confounded mathematical ability/ achievement with general educational achievement and/or measures of cognitive ability. In addition these studies tended to use only family variables which could be measured quantitatively and in ways which facilitated statistical analysis. However, the re-analysis of NCDS data showed a significant association between teachers' subjective assessment of parental interest in their children's education when they were aged 7 years, and the children's mathematical achievement at age 11 years. This significant relationship led to the focus in the second, qualitative phase on the involvement of parents in their children's education (Steinberg and Silverberg, 1986; Lareau, A. 1987,1989), on intra-family interactions (Wentzel, K. R. 1994), and the possible relations between them and the children's mathematical achievement. In the later stages, therefore, following a methodological model developed by Goetz and Lecompte (1995), qualitative techniques were utilised to elicit from parents details of intra-family interactions, with particular emphasis on their involvement with their children's educational activities. The results of the qualitative phase of this study suggested that high mathematics achievers were more likely to be found in families where mothers and fathers had both obtained 0 Levels, where a similar history of educational achievement in the wider families was reported, and where there was a high level of parent/child/sibling interaction. In contrast, low mathematics achievers were more likely to be found in families where only one or neither parent had obtained 0 Levels, where there was little evidence offered of educational achievements in the wider families.

Published
1999

19. EuroSea Strategic vision

Author

Revelard, Adele, Tintore, Joaquin, Verron, Jacques, Bahurel, Pierre, Barth, John A., Belbeoch, Mathieu, Benveniste, Jerome, Bonnefond, Pascal, Chassignet, Eric P., Cravatte, Sophie, Davidson, Fraser, deYoung, Brad, Heupel, Michelle, Heslop, Emma, Hörstmann, Cora, Karstensen, Johannes, Yves Le Traon, Pierre, Marques, Miguel, McLean, Craig, Medina, Raul, Paluszkiewicz, Theresa, Pascual, Ananda, Pearlman, Jay, Petihakis, George, Pinardi, Nadia, Pouliquen, Sylvie, Rayner, Ralph, Shepherd, Iian, Sprintail, Janet, Tanhua, Toste, Testor, Pierre, Seppälä, Jukka, Siddorn, John, Thomsen, Soeren, Valdes, Luis, Visbeck, Martin, Waite, Anya M., Werner, Francisco, Wilkin, John, Williams, Ben, Revelard, Adele, Tintore, Joaquin, Verron, Jacques, Bahurel, Pierre, Barth, John A., Belbeoch, Mathieu, Benveniste, Jerome, Bonnefond, Pascal, Chassignet, Eric P., Cravatte, Sophie, Davidson, Fraser, deYoung, Brad, Heupel, Michelle, Heslop, Emma, Hörstmann, Cora, Karstensen, Johannes, Yves Le Traon, Pierre, Marques, Miguel, McLean, Craig, Medina, Raul, Paluszkiewicz, Theresa, Pascual, Ananda, Pearlman, Jay, Petihakis, George, Pinardi, Nadia, Pouliquen, Sylvie, Rayner, Ralph, Shepherd, Iian, Sprintail, Janet, Tanhua, Toste, Testor, Pierre, Seppälä, Jukka, Siddorn, John, Thomsen, Soeren, Valdes, Luis, Visbeck, Martin, Waite, Anya M., Werner, Francisco, Wilkin, John, and Williams, Ben

Abstract

This report provides recommendations to foster collaboration and cooperation between technologies and disciplines and for implementing truly integrated ocean observing systems. Based on an intensive literature review and a careful examination of different examples of integration in different fields, this work identifies the issues and barriers that must be addressed, and proposes a vision for a real implementation of this ocean integration ambition. This work is a contribution to the implementation of EOOS, a much-needed step forward in Europe, following the international guidance of GOOS.

Published
2023
Full Text
View/download PDF

20. Evaluation of operational ocean forecasting systems from the perspective of the users and the experts

Author

Ciliberti, Stefania A., Fanjul, Enrique Alvarez, Pearlman, Jay, Wilmer-Becker, Kirsten, Bahurel, Pierre, Ardhuin, Fabrice, Arnaud, Alain, Bell, Mike, Berthou, Segolene, Bertino, Laurent, Capet, Arthur, Chassignet, Eric, Ciavatta, Stefano, Cirano, Mauro, Clementi, Emanuela, Cossarini, Gianpiero, Coro, Gianpaolo, Corney, Stuart, Davidson, Fraser, Drevillon, Marie, Drillet, Yann, Dussurget, Renaud, El Serafy, Ghada, Fennel, Katja, Sotillo, Marcos Garcia, Heimbach, Patrick, Hernandez, Fabrice, Hogan, Patrick, Hoteit, Ibrahim, Joseph, Sudheer, Josey, Simon, Le Traon, Pierre-Yves, Libralato, Simone, Mancini, Marco, Matte, Pascal, Melet, Angelique, Miyazawa, Yasumasa, Moore, Andrew M., Novellino, Antonio, Porter, Andrew, Regan, Heather, Romero, Laia, Schiller, Andreas, Siddorn, John, Staneva, Joanna, Thomas-Courcoux, Cecile, Tonani, Marina, Garcia-Valdecasa, Jose Maria, Veitch, Jennifer, von Schuckmann, Karina, Wan, Liying, Wilkin, John, Zufic, Romane, Ciliberti, Stefania A., Fanjul, Enrique Alvarez, Pearlman, Jay, Wilmer-Becker, Kirsten, Bahurel, Pierre, Ardhuin, Fabrice, Arnaud, Alain, Bell, Mike, Berthou, Segolene, Bertino, Laurent, Capet, Arthur, Chassignet, Eric, Ciavatta, Stefano, Cirano, Mauro, Clementi, Emanuela, Cossarini, Gianpiero, Coro, Gianpaolo, Corney, Stuart, Davidson, Fraser, Drevillon, Marie, Drillet, Yann, Dussurget, Renaud, El Serafy, Ghada, Fennel, Katja, Sotillo, Marcos Garcia, Heimbach, Patrick, Hernandez, Fabrice, Hogan, Patrick, Hoteit, Ibrahim, Joseph, Sudheer, Josey, Simon, Le Traon, Pierre-Yves, Libralato, Simone, Mancini, Marco, Matte, Pascal, Melet, Angelique, Miyazawa, Yasumasa, Moore, Andrew M., Novellino, Antonio, Porter, Andrew, Regan, Heather, Romero, Laia, Schiller, Andreas, Siddorn, John, Staneva, Joanna, Thomas-Courcoux, Cecile, Tonani, Marina, Garcia-Valdecasa, Jose Maria, Veitch, Jennifer, von Schuckmann, Karina, Wan, Liying, Wilkin, John, and Zufic, Romane

Abstract

The Intergovernmental Oceanographic Commission (IOC) has an Ocean Decade Implementation Plan (UNESCO-IOC, 2021) that states seven outcomes required for the ocean we want, with the fourth outcome being “A predicted ocean where society understands and can respond to changing ocean conditions.” To facilitate the achievement of this goal, the IOC has endorsed Mercator Ocean International to implement the Decade Collaborative Center (DCC) for OceanPrediction (https://www.mercator-ocean.eu/oceanprediction/, last access: 21 August 2023), which is a cross-cutting structure that will work to develop global-scale collaboration between Decade Actions related to ocean prediction.

Published
2023

23. Estuarine Dissolved Organic Carbon Flux from Space: With Application to Chesapeake and Delaware Bays

Author

Signorini, Sergio, Mannino, Antonio, Friedrichs, Marjorie A. M, St‐Laurent, Pierre, Wilkin, John, Tabatabai, Aboozar, Najjar, Raymond G, Hofmann, Eileen E, Da, Fei, Tian, Hanqin, and Yao, Yuanzhi

Subjects
Earth Resources And Remote Sensing, Meteorology And Climatology
Abstract

This study uses a neural network model trained with in situ data, combined with satellite data and hydrodynamic model products, to compute the daily estuarine export of dissolved organic carbon (DOC) at the mouths of Chesapeake Bay (CB) and Delaware Bay (DB) from 2007 to 2011. Both bays show large flux variability with highest fluxes in spring and lowest in fall as well as interannual flux variability (0.18 and 0.27 Tg C/year in 2008 and 2010 for CB; 0.04 and 0.09 Tg C/year in 2008 and 2011 for DB). Based on previous estimates of total organic carbon (TOCexp) exported by all Mid-Atlantic Bight estuaries (1.2 Tg C/year), the DOC export (CB + DB) of 0.3 Tg C/year estimated here corresponds to 25% of the TOCexp. Spatial and temporal covariations of velocity and DOC concentration provide contributions to the flux, with larger spatial influence. Differences in the discharge of fresh water into the bays (74 billion m(exp3)/year for CB and 21 billion m9exp3)/year for DB) and their geomorphologies are major drivers of the differences in DOC fluxes for these two systems. Terrestrial DOC inputs are similar to the export of DOC at the bay mouths at annual and longer time scales but diverge significantly at shorter time scales (days to months). Future efforts will expand to the Mid-Atlantic Bight and Gulf of Maine, and its major rivers and estuaries, in combination with coupled terrestrial-estuarine-ocean biogeochemical models that include effects of climate change, such as warming and CO2 increase.

Published
2019
Full Text
View/download PDF

24. Ocean Circulation Causes Strong Variability in the Mid-Atlantic Bight Nitrogen Budget

Author

Friedrichs, Marjorie A. M, St-Laurent, Pierre, Xiao, Yongjin, Hofmann, Eileen, Hyde, Kimberly, Mannino, Antonio, Najjar, Raymond G, Narvaez, Diego A, Signorini, Sergio R, Tian, Hanqin, Wilkin, John, Yao, Yuanzhi, and Xue, Jianhong

Subjects
Environment Pollution, Oceanography
Abstract

Understanding of nitrogen cycling on continental shelves, a critical component of global nutrient cycling, is hampered by limited observations compared to the strong variability on a wide range of time and space scales. Numerical models have the potential to partially alleviate this issue by filling spatio-temporal data gaps and hence resolving annual area-integrated nutrient fluxes. In this study, a three-dimensional bio geo chemical-circulation model was implemented to simulate the Mid-Atlantic Bight (MAB) nitrogen budget. Model results demonstrate that, on average, MAB net community production (NCP) was positive (plus 0.27 teragrams (Tg) Nitrogen per year), indicating net autotrophy. Inter-annual variability in NCP was strong, with annual values ranging between 0.19 and 0.41 Tg N/year. Along-shelf and across-shelf horizontal transport fluxes were the other dominant terms in the nitrogen budget and were primarily responsible for this NCP variability. The along-shelf current transported nitrogen from the north (0.65 Tg N/year) into the MAB, supplementing the nitrogen entering from terrestrial inputs (0.27 Tg N/year). However, NCP was highest in the year when total water volume transport and inorganic nitrogen input was strongest across the continental slope in the southern MAB, rather than when terrestrial inputs were greatest. Inter-annual variability of NCP appears to be linked to changes in the positions of the Gulf Stream and Slope Water Gyre. Overall, the strong spatio temporal variability of the nitrogen fluxes highlights the importance of observations throughout all seasons and multiple years in order to accurately resolve the current status and future changes of the MAB nitrogen budget.

Published
2018
Full Text
View/download PDF

26. Satellite Altimetry in Coastal Regions

Author

Cipollini, Paolo, primary, Benveniste, Jérôme, additional, Birol, Florence, additional, Fernandes, M. Joana, additional, Obligis, Estelle, additional, Passaro, Marcello, additional, Strub, P. Ted, additional, Valladeau, Guillaume, additional, Vignudelli, Stefano, additional, and Wilkin, John, additional

Published
2017
Full Text
View/download PDF

27. Estimating the seasonal impact of optically significant water constituents on surface heating rates in the western Baltic Sea.

Author

Cahill, Bronwyn E., Kowalczuk, Piotr, Kritten, Lena, Gräwe, Ulf, Wilkin, John, and Fischer, Jürgen

Subjects
DISSOLVED organic matter, HEAT flux, SPRING, OCEAN temperature, SEASONS, ATMOSPHERE, SEDIMENT-water interfaces, OCEAN color
Abstract

Heating rates induced by optically significant water constituents (OSCs), e.g. phytoplankton and coloured dissolved organic matter (CDOM), contribute to the seasonal modulation of thermal energy fluxes across the ocean–atmosphere interface in coastal and regional shelf seas. This is investigated in the western Baltic Sea, a marginal sea characterised by considerable inputs of freshwater carrying nutrients and CDOM and by complex bio-optical and hydrodynamic processes. Using a coupled bio-optical ocean model (ROMS–Bio-Optic), the inherent optical properties of different OSCs are modelled under varying environmental conditions, and the underwater light field is spectrally resolved in a dynamic ocean. We estimate the relative contribution of these OSCs to the divergence of the heat flux and heating rates and find that, while phytoplankton and CDOM both contribute to surface heating in summer, phytoplankton dominates the OSC contribution to heating in spring, and CDOM dominates the OSC contribution to heating in autumn. The study shows that seasonal and spatial changes in OSCs in the western Baltic Sea have a small but noticeable impact on radiative heating in surface waters and consequences for the exchange of energy fluxes across the air–sea interface and the distribution of heat within the water column. In the Pomeranian Bight, where riverine influx of CDOM is strongest, water-constituent-induced heating rates in surface waters in 2018 are estimated to be between 0.8 and 0.9 K m -1 d -1 in spring and summer, predominantly as a result of increased absorption by phytoplankton and CDOM. Further offshore, OSC-induced heating rates during the same periods are estimated to be between 0.4 and 0.8 K m -1 d -1. Warmer surface waters are balanced by cooler subsurface waters. Surface heat fluxes (latent, sensible and longwave) respond to warmer sea surface temperatures, with a small increase in heat loss to the atmosphere of 5 W m -2 during the period April to September. We find relatively good agreement between our modelled water constituent absorption and in situ and satellite observations. More rigorous co-located heating-rate calculations using an atmosphere–ocean radiative transfer model provide evidence of the suitability of the ROMS–Bio-Optic model for estimating heating rates. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

29. Modeling and Data Assimilation

Author

Moisan, John R., Miller, Arthur J., Di Lorenzo, Emanuele, Wilkin, John, van der Meer, Freek D., editor, Miller, Richard L., editor, Del Castillo, Carlos E., editor, and Mckee, Brent A., editor

Published
2005
Full Text
View/download PDF

33. ROMS configuration of a two-way nested model of the Mid-Atlantic Bight and Delaware Bay

Author

Gerbi, Gregory P., Hunter, Elias, Wilkin, John L., Chant, Robert, Fuchs, Heidi L., and Garwood, Jessica C.

Subjects
Waves, Larval Transport, Coastal Circulation, Ocean Modeling, Estuarine Circulation
Abstract

This is an archive of model configuration files for the Regional Ocean Modeling System (ROMS) with two grids and two-way nesting. The parent grid resolution (referred to as Doppio) is 7 km and spans the Atlantic Ocean off the northeast United States from Cape Hatteras to Nova Scotia. The refinement grid (referred to as Snaildel) focuses on Delaware Bay and the adjacent coastal ocean at 1 km resolution. This ROMS configuration uses turbulence kinetic energy flux and significant wave height from Simulating Waves Nearshore (SWAN) as surface boundary conditions for turbulence closure. Also included is a MATLAB script to compute statistics of acceleration and vorticity caused by turbulence. This model configuration is part of NSF-funded research investigating the link between behavior and transport of larvae using waves and turbulence as cues. It provides the 4-dimensional velocity field used in the offline particle tracking model ROMSPath, as well as 4-D temperature and turbulent quantities necessary to simulate larvae behavior. References: Hunter, E. J., H. L. Fuchs, J. L. Wilkin, G. P. Gerbi, R. J. Chant and J. C. Garwood (2021). "ROMSPath v1.0: Offline Particle Tracking for the Regional Ocean Modeling System (ROMS)." Geosci. Model Dev. Discuss. [preprint]: https://doi.org/10.5194/gmd-2021-5400. Garwood, J. C., H. L. Fuchs, G. P. Gerbi, E. J. Hunter, R. J. Chant and J. L. Wilkin (2022). "Estuarine retention of larvae: Contrasting effects of behavioral responses to turbulence and waves." Limnol. Oceanogr. In press., The Doppio model is nudged to a reanalysis which assimilates observations and is located at https://tds.marine.rutgers.edu/thredds/roms/doppio/catalog.html. This is updated periodically as new data and methods become available. Additional funding from National Science Foundation Grants OCE- 2051795.

Published
2022
Full Text
View/download PDF

34. Ocean Integration: The needs and challenges of effective coordination within the ocean observing system

Author

Révelard, Adèle, Tintoré, Joaquín, Verron, Jacques, Bahurel, Pierre, Barth, John A., Belbéoch, Mathieu, Benveniste, Jérôme, Bonnefond, Pascal, Chassignet, Eric P., Cravatte, Sophie, Davidson, Fraser, deYoung, Brad, Heupel, Michelle, Heslop, Emma, Hörstmann, Cora, Karstensen, Johannes, Le Traon, Pierre Yves, Marques, Miguel, McLean, Craig, Medina, Raul, Paluszkiewicz, Theresa, Pascual, Ananda, Pearlman, Jay, Petihakis, George, Pinardi, Nadia, Pouliquen, Sylvie, Rayner, Ralph, Shepherd, Iian, Sprintall, Janet, Tanhua, Toste, Testor, Pierre, Seppälä, Jukka, Siddorn, John, Thomsen, Soeren, Valdés, Luis, Visbeck, Martin, Waite, Anya M., Werner, Francisco, Wilkin, John, Williams, Ben, Révelard, Adèle, Tintoré, Joaquín, Verron, Jacques, Bahurel, Pierre, Barth, John A., Belbéoch, Mathieu, Benveniste, Jérôme, Bonnefond, Pascal, Chassignet, Eric P., Cravatte, Sophie, Davidson, Fraser, deYoung, Brad, Heupel, Michelle, Heslop, Emma, Hörstmann, Cora, Karstensen, Johannes, Le Traon, Pierre Yves, Marques, Miguel, McLean, Craig, Medina, Raul, Paluszkiewicz, Theresa, Pascual, Ananda, Pearlman, Jay, Petihakis, George, Pinardi, Nadia, Pouliquen, Sylvie, Rayner, Ralph, Shepherd, Iian, Sprintall, Janet, Tanhua, Toste, Testor, Pierre, Seppälä, Jukka, Siddorn, John, Thomsen, Soeren, Valdés, Luis, Visbeck, Martin, Waite, Anya M., Werner, Francisco, Wilkin, John, and Williams, Ben

Abstract

Understanding and sustainably managing complex environments such as marine ecosystems benefits from an integrated approach to ensure that information about all relevant components and their interactions at multiple and nested spatiotemporal scales are considered. This information is based on a wide range of ocean observations using different systems and approaches. An integrated approach thus requires effective collaboration between areas of expertise in order to improve coordination at each step of the ocean observing value chain, from the design and deployment of multi-platform observations to their analysis and the delivery of products, sometimes through data assimilation in numerical models. Despite significant advances over the last two decades in more cooperation across the ocean observing activities, this integrated approach has not yet been fully realized. The ocean observing system still suffers from organizational silos due to independent and often disconnected initiatives, the strong and sometimes destructive competition across disciplines and among scientists, and the absence of a well-established overall governance framework. Here, we address the need for enhanced organizational integration among all the actors of ocean observing, focusing on the occidental systems. We advocate for a major evolution in the way we collaborate, calling for transformative scientific, cultural, behavioral, and management changes. This is timely because we now have the scientific and technical capabilities as well as urgent societal and political drivers. The ambition of the United Nations Decade of Ocean Science for Sustainable Development (2021–2030) and the various efforts to grow a sustainable ocean economy and effective ocean protection efforts all require a more integrated approach to ocean observing. After analyzing the barriers that currently prevent this full integration within the occidental systems, we suggest nine approaches for breaking down the silos and promot

Published
2022

35. Otolith chemistry from Menhaden nurseries collected from multiple sites along the US Eastern Coast from 2009-2011 (Contribution of Menhaden Nurseries project)

Author

Jones, Cynthia M., Miller, Thomas, Wilkin, John, Schaffler, Jason, Jones, Cynthia M., Miller, Thomas, Wilkin, John, and Schaffler, Jason

Abstract

Dataset: Menhaden Otolith Chemistry, This dataset reports otolith chemistry measurements from Menhaden nurseries collected from multiple sites along the US Eastern Coast from 2009-2011. For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/528569, NSF Division of Ocean Sciences (NSF OCE) OCE-0961421, NSF Division of Ocean Sciences (NSF OCE) OCE-0961827, NSF Division of Ocean Sciences (NSF OCE) OCE-0961632

Published
2022

36. Ocean Integration: The Needs and Challenges of Effective Coordination Within the Ocean Observing System

Author

European Commission, Révelard, Adèle, Tintoré, Joaquín, Verron, Jacques, Bahurel, Pierre, Barth, Alexander, Belbéoch, Mathieu, Benveniste, Jérôme, Bonnefond, Pascal, Chassignet, Eric P., Cravatte, Sophie, Davidson, Fraser, deYoung, Brad, Heupel, Michelle, Heslop, Emma, Hörstmann, Cora, Karstensen, Johannes, Le Traon, Pierre-Yves, Marques, Miguel, McLean, Craig, Medina, Raúl, Paluszkiewicz, Theresa, Pascual, Ananda, Pearlman, Jay, Petihakis, George, Pinardi, Nadia, Pouliquen, Sylvie, Rayner, Ralph, Shepherd, Iian, Sprintall, Janet, Tanhua, Toste, Testor, Pierre, Seppälä, Jukka, Siddorn, John, Thomsen, Soeren, Valdés, Luis, Visbeck, Martin, Waite, Anya M., Werner, Francisco, Wilkin, John, Williams, Ben, European Commission, Révelard, Adèle, Tintoré, Joaquín, Verron, Jacques, Bahurel, Pierre, Barth, Alexander, Belbéoch, Mathieu, Benveniste, Jérôme, Bonnefond, Pascal, Chassignet, Eric P., Cravatte, Sophie, Davidson, Fraser, deYoung, Brad, Heupel, Michelle, Heslop, Emma, Hörstmann, Cora, Karstensen, Johannes, Le Traon, Pierre-Yves, Marques, Miguel, McLean, Craig, Medina, Raúl, Paluszkiewicz, Theresa, Pascual, Ananda, Pearlman, Jay, Petihakis, George, Pinardi, Nadia, Pouliquen, Sylvie, Rayner, Ralph, Shepherd, Iian, Sprintall, Janet, Tanhua, Toste, Testor, Pierre, Seppälä, Jukka, Siddorn, John, Thomsen, Soeren, Valdés, Luis, Visbeck, Martin, Waite, Anya M., Werner, Francisco, Wilkin, John, and Williams, Ben

Abstract

Understanding and sustainably managing complex environments such as marine ecosystems benefits from an integrated approach to ensure that information about all relevant components and their interactions at multiple and nested spatiotemporal scales are considered. This information is based on a wide range of ocean observations using different systems and approaches. An integrated approach thus requires effective collaboration between areas of expertise in order to improve coordination at each step of the ocean observing value chain, from the design and deployment of multi-platform observations to their analysis and the delivery of products, sometimes through data assimilation in numerical models. Despite significant advances over the last two decades in more cooperation across the ocean observing activities, this integrated approach has not yet been fully realized. The ocean observing system still suffers from organizational silos due to independent and often disconnected initiatives, the strong and sometimes destructive competition across disciplines and among scientists, and the absence of a well-established overall governance framework. Here, we address the need for enhanced organizational integration among all the actors of ocean observing, focusing on the occidental systems. We advocate for a major evolution in the way we collaborate, calling for transformative scientific, cultural, behavioral, and management changes. This is timely because we now have the scientific and technical capabilities as well as urgent societal and political drivers. The ambition of the United Nations Decade of Ocean Science for Sustainable Development (2021–2030) and the various efforts to grow a sustainable ocean economy and effective ocean protection efforts all require a more integrated approach to ocean observing. After analyzing the barriers that currently prevent this full integration within the occidental systems, we suggest nine approaches for breaking down the silos and promot

Published
2022

37. Multiscale multiphysics data-informed modeling for three-dimensional ocean acoustic simulation and prediction

Author

Duda, Timothy F., Lin, Ying-Tsong, Newhall, Arthur E., Helfrich, Karl R., Lynch, James F., Zhang, Weifeng Gordon, Lermusiaux, Pierre F. J., Wilkin, John, Duda, Timothy F., Lin, Ying-Tsong, Newhall, Arthur E., Helfrich, Karl R., Lynch, James F., Zhang, Weifeng Gordon, Lermusiaux, Pierre F. J., and Wilkin, John

Abstract

© 2019 Acoustical Society of America. Three-dimensional (3D) underwater sound field computations have been used for a few decades to understand sound propagation effects above sloped seabeds and in areas with strong 3D temperature and salinity variations. For an approximate simulation of effects in nature, the necessary 3D sound-speed field can be made from snapshots of temperature and salinity from an operational data-driven regional ocean model. However, these models invariably have resolution constraints and physics approximations that exclude features that can have strong effects on acoustics, example features being strong submesoscale fronts and nonhydrostatic nonlinear internal waves (NNIWs). Here, work to predict NNIW fields to improve 3D acoustic forecasts using an NNIW model nested in a tide-inclusive data-assimilating regional model is reported. The work was initiated under the Integrated Ocean Dynamics and Acoustics project. The project investigated ocean dynamical processes that affect important details of sound-propagation, with a focus on those with strong intermittency (high kurtosis) that are challenging to predict deterministically. Strong internal tides and NNIW are two such phenomena, with the former being precursors to NNIW, often feeding energy to them. Successful aspects of the modeling are reported along with weaknesses and unresolved issues identified in the course of the work.

Published
2022

43. New global Mean Dynamic Topography CNES-CLS-22 combining drifters, hydrological profiles and High Frequency radar data

Author

Jousset, Solène, Mulet, Sandrine, Wilkin, John, Greiner, Eric, Dibarboure, Gérald, and Picot, Nicolas

Abstract

The Mean Dynamic Topography (MDT) is a key reference surface for altimetry. It is needed for the calculation of the ocean absolute dynamic topography, and under the geostrophic approximation, the estimation of surface currents. The MDT is the missing component for the optimal assimilation of altimeter data into operational ocean system. However, in coastal areas, where in-situ measurements are sparse, mainly on the shelf, the global MDT solutions are often less accurate than in the open ocean. Considering the availability of long time-series of high-quality HF-Radar velocity measurements in the Mid Atlantic Bight, the main objective is to include these data to calculate an improved MDT is this area. The prerequisites for the computation of this new Mean Dynamic Topography are to remove the non-geostrophic signal from the HF radar measured velocities. The first step is thus to pre-process these data. We used average currents from December 2006 through November 2016, estimated from HF radars and processed by Rutgers University (https://tds.marine.rutgers.edu/thredds/cool/codar/cat_totals.html ; Roarty et al, 2021). Then the mean wind-driven currents modelized as in Mulet et al (2021), were removed. Besides, the first guess MDT computed from altimetry and gravimetry was improved by using a dedicated filter along the coast. Finally, the improved MDT was estimated from the first guess MDT and the processed in-situ data (HF-radars, drifters and T/S profiles) through a multivariate objective analysis. This new regional MDT defines better currents near the coast. In particular, the MDT shows more organized across-shelf gradient following the shelf-break, and a more continuous mean flow on the shelf. Mulet, Sandrine, Marie-Hélène Rio, Hélène Etienne, Camilia Artana, Mathilde Cancet, Gérald Dibarboure, Hui Feng, et al. « The New CNES-CLS18 Global Mean Dynamic Topography ». Ocean Science 17, nᵒ 3 (17 juin 2021): 789‑808. https://doi.org/10.5194/os-17-789-2021. Roarty, Hugh, Scott Glenn, Joseph Brodie, Laura Nazzaro, Michael Smith, Ethan Handel, Josh Kohut, et al. « Annual and Seasonal Surface Circulation Over the Mid-Atlantic Bight Continental Shelf Derived From a Decade of High Frequency Radar Observations ». Journal of Geophysical Research: Oceans 125, nᵒ 11 (2020): e2020JC016368. https://doi.org/10.1029/2020JC016368.

Published
2022
Full Text
View/download PDF

45. Ocean Integration: The Needs and Challenges of Effective Coordination Within the Ocean Observing System

Author

Révelard, Adèle, primary, Tintoré, Joaquín, additional, Verron, Jacques, additional, Bahurel, Pierre, additional, Barth, John A., additional, Belbéoch, Mathieu, additional, Benveniste, Jérôme, additional, Bonnefond, Pascal, additional, Chassignet, Eric P., additional, Cravatte, Sophie, additional, Davidson, Fraser, additional, deYoung, Brad, additional, Heupel, Michelle, additional, Heslop, Emma, additional, Hörstmann, Cora, additional, Karstensen, Johannes, additional, Le Traon, Pierre Yves, additional, Marques, Miguel, additional, McLean, Craig, additional, Medina, Raul, additional, Paluszkiewicz, Theresa, additional, Pascual, Ananda, additional, Pearlman, Jay, additional, Petihakis, George, additional, Pinardi, Nadia, additional, Pouliquen, Sylvie, additional, Rayner, Ralph, additional, Shepherd, Iian, additional, Sprintall, Janet, additional, Tanhua, Toste, additional, Testor, Pierre, additional, Seppälä, Jukka, additional, Siddorn, John, additional, Thomsen, Soeren, additional, Valdés, Luis, additional, Visbeck, Martin, additional, Waite, Anya M., additional, Werner, Francisco, additional, Wilkin, John, additional, and Williams, Ben, additional

Published
2022
Full Text
View/download PDF

48. Estimating the seasonal impact of optically significant water constituents on surface heating rates in the Western Baltic Sea.

Author

Cahill, Bronwyn E., Kowalczuk, Piotr, Kritten, Lena, Gräwe, Ulf, Wilkin, John, and Fischer, Jürgen

Subjects
SPRING, SEASONS, DISSOLVED organic matter, HEAT flux, OCEAN temperature, ATMOSPHERE, SEDIMENT-water interfaces, OCEAN color
Abstract

Abstract. Heating rates induced by optically significant water constituents (OSCs), e.g. phytoplankton and coloured dissolved organic matter (CDOM), contribute to the seasonal modulation of thermal energy fluxes across the ocean- atmosphere interface in coastal and regional shelf seas. This is investigated in the Western Baltic Sea, a marginal sea characterised by considerable inputs of freshwater carrying nutrients and CDOM, and complex bio-optical and hydrodynamic processes. Using a coupled bio-optical-ocean model (ROMS-Bio-Optic), the inherent optical properties of different OSCs are modelled under varying environmental conditions and the underwater light field is spectrally- resolved in a dynamic ocean. We estimate the relative contribution of these OSCs to the divergence of the heat flux and heating rates and find that phytoplankton dominates the OSC contribution to heating in spring and summer, while CDOM dominates in summer and autumn. The study shows that seasonal and spatial changes in OSCs in the Western Baltic Sea have a small but noticeable impact on radiative heating in surface waters and consequences for the exchange of energy fluxes across the air-sea interface and the distribution of heat within the water column. In the Pomeranian Bight, where riverine influx of CDOM is strongest, water constituent-induced heating rates in surface waters in 2018 are estimated to be between 0.8 and 0.9 K m-1 d-1 in spring and summer, predominantly as a result of increased absorption by phytoplankton and CDOM. Further offshore, OSC-induced heating rates during the same periods are estimated to be between 0.4 and 0.8 K m-1 d-1. Warmer surface waters are balanced by cooler subsurface waters. Surface heat fluxes (latent, sensible and longwave) respond to warmer sea surface temperatures with a small increase in heat loss to the atmosphere of 5 Wm-2 during the period April to September. We find relatively good agreement between our modelled water constituent absorption, and in situ and satellite observations. More rigorous co-located heating rate calculations using an atmosphere-ocean radiative transfer model provide evidence of the suitability of the ROMS-Bio-Optic model for estimating heating rates. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results