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Your search keyword '"Meyer, Amelie"' showing total 19 results
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19 results on '"Meyer, Amelie"'

3. Closing the loops on Southern Ocean dynamics: From the circumpolar current to ice shelves and from bottom mixing to surface waves

Author

Bennetts, Luke G, primary, Shakespeare, Callum J, additional, Vreugdenhil, Catherine A, additional, Foppert, Annie, additional, Gayen, Bishakhdatta, additional, Meyer, Amelie, additional, Morrison, Adele K, additional, Padman, Laurie, additional, Phillips, Helen E, additional, Stevens, Craig L, additional, Toffoli, Alessandro, additional, Constantinou, Navid C., additional, Cusack, Jesse, additional, Cyriac, Ajitha, additional, Doddridge, Edward W, additional, England, Matthew H, additional, Evans, D Gwyn, additional, Heil, Petra, additional, Hogg, Andrew Mcc, additional, Holmes, Ryan M, additional, Huneke, Wilma G C, additional, Jones, Nicole L, additional, Keating, Shane R, additional, Kiss, Andrew E, additional, Kraitzman, Noa, additional, Malyarenko, Alena, additional, Mcconnochie, Craig D, additional, Meucci, Alberto, additional, Montiel, Fabien, additional, Neme, Julia, additional, Nikurashin, Maxim, additional, Patel, Ramkrushnbhai S, additional, Peng, Jen-Ping, additional, Rayson, Matthew, additional, Rosevear, Madelaine G, additional, Sohail, Taimoor, additional, Spence, Paul, additional, and Stanley, Geoffrey J, additional

Published
2024
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5. Connecting to the oceans: supporting ocean literacy and public engagement

Author

Kelly, Rachel, Evans, Karen, Alexander, Karen, Bettiol, Silvana, Corney, Stuart, Cullen-Knox, Coco, Cvitanovic, Christopher, de Salas, Kristy, Emad, Gholam Reza, Fullbrook, Liam, Garcia, Carolina, Ison, Sierra, Ling, Scott, Macleod, Catriona, Meyer, Amelie, Murray, Linda, Murunga, Michael, Nash, Kirsty L., Norris, Kimberley, Oellermann, Michael, Scott, Jennifer, Stark, Jonathan S., Wood, Graham, and Pecl, Gretta T.

Published
2022
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7. Observational Evidence for a Regime Shift in Summer Antarctic Sea Ice.

Author

Hobbs, Will, Spence, Paul, Meyer, Amelie, Schroeter, Serena, Fraser, Alexander D., Reid, Philip, Tian, Tian R., Wang, Zhaohui, Liniger, Guillaume, Doddridge, Edward W., and Boyd, Philip W.

Subjects
ANTARCTIC ice, SEA ice, DYNAMICAL systems, SUMMER, RESEARCH personnel, SYSTEMS theory
Abstract

In recent years, the Southern Ocean has experienced extremely low sea ice cover in multiple summers. These low events were preceded by a multidecadal positive trend that culminated in record high ice coverage in 2014. This abrupt transition has led some authors to suggest that Antarctic sea ice has undergone a regime shift. In this study we analyze the satellite sea ice record and atmospheric reanalyses to assess the evidence for such a shift. We find that the standard deviation of the summer sea ice record has doubled from 0.31 million km2 in 1979–2006 to 0.76 million km2 for 2007–22. This increased variance is accompanied by a longer season-to-season sea ice memory. The atmosphere is the primary driver of Antarctic sea ice variability, but using a linear predictive model we show that sea ice changes cannot be explained by the atmosphere alone. Identifying whether a regime shift has occurred is difficult without a complete understanding of the physical mechanism of change. However, the statistical changes that we demonstrate (i.e., increased variance and autocorrelation, and a changed response to atmospheric forcing), as well as the increased spatial coherence noted by previous research, are indicators based on dynamical systems theory of an abrupt critical transition. Thus, our analysis is further evidence in support of a changed Antarctic sea ice system. Significance Statement: In recent years, there have been several summers with extremely low Antarctic sea ice cover, including consecutive record lows in February 2022 and February 2023. Since then, the 2023 winter has seen a remarkably low sea ice growth with an anomaly far below expected climatology. This has led researchers to question whether there has been a regime shift, and we assess the observational evidence for such a shift. In the last decade or so, the variability of summer sea ice has almost doubled, accompanied by a much longer sea ice memory from season to season. These statistical changes, as well an increased spatial coherence noted by other researchers, are consistent with theoretical indicators of a critical transition, or regime shift. [ABSTRACT FROM AUTHOR]

Published
2024
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9. Closing the loops on Southern Ocean dynamics: From the circumpolar current to ice shelves and from bottom mixing to surface waves

Author

Bennetts, Luke G, primary, Shakespeare, Callum J, additional, Vreugdenhil, Catherine A, additional, Foppert, Annie, additional, Gayen, Bishakhdatta, additional, Meyer, Amelie, additional, Morrison, Adele K, additional, Padman, Laurie, additional, Phillips, Helen E, additional, Stevens, Craig L, additional, Toffoli, Alessandro, additional, Constantinou, Navid C., additional, Cusack, Jesse, additional, Cyriac, Ajitha, additional, Doddridge, Edward W, additional, England, Matthew H, additional, Evans, D Gwyn, additional, Heil, Petra, additional, Hogg, Andrew Mcc, additional, Holmes, Ryan M, additional, Huneke, Wilma G C, additional, Jones, Nicole L, additional, Keating, Shane R, additional, Kiss, Andrew E, additional, Kraitzman, Noa, additional, Malyarenko, Alena, additional, Mcconnochie, Craig D, additional, Meucci, Alberto, additional, Montiel, Fabien, additional, Neme, Julia, additional, Nikurashin, Maxim, additional, Patel, Ramkrushnbhai S, additional, Peng, Jen-Ping, additional, Rayson, Matthew, additional, Rosevear, Madelaine G, additional, Sohail, Taimoor, additional, Spence, Paul, additional, and Stanley, Geoffrey J, additional

Published
2023
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11. Mapping of Upper Ocean Velocity and Transport in the Cape Farewell Area

Author

Meyer, Amelie

Subjects
Physical oceanography
Abstract

The global Thermohaline Circulation (THC), driven by fluxes of heat and fresh water at the ocean surface, is known to be intimately involved with major vanations tn the Earth' climate. The East Greenland Coastal Current (EGCC) together with the East Greenland Current (EGC), represent the major surface currents drawing fresh water southwards in the North Atlantic and therefore play an important role in the THC. By identifying and quantifying Sub-Polar ocean processes such as the EGC we can consolidate our knowledge on present-day climate variability. To do so, hydro graphic data from cruise D298 was analyzed and volume transport calculated. We found that the EGC (initially 8.3 Sv) and the EGCC (initially 1.6 Sv), merge around Cape Farewell and that 2.2 Sv of volume transport is lost in the process. We suggest that a certain volume of the boundary currents is integrated into recirculation cells and that 2 2 Sv is exported southward. Further work is needed on the fresh water fluxes to investigate the exact quantity of fresh water exported from the EGC and EGCC into the North Atlantic.

Published
2023
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17. Nutrients in Water Masses in the Atlantic Sector of the Arctic Ocean: Temporal Trends, Mixing and Links With Primary Production

Author

Duarte, Pedro, Meyer, Amelie, and Moreau, Sebastien

Subjects
geography, Water mass, geography.geographical_feature_category, Primary producers, Climate change, Oceanography, Geophysics, Nutrient, Arctic, Space and Planetary Science, Geochemistry and Petrology, Earth and Planetary Sciences (miscellaneous), Sea ice, Environmental science, Photic zone, Surface water
Abstract

There is strong evidence of an increase in primary production (PP) in the Arctic Ocean (AO) over the last two decades. Further increases will depend on the interplay between decreasing light limitation for primary producers, as the sea ice extent and thickness decrease, and the availability of nutrients, which is controlled by, but not limited to, inputs from the Atlantic and the Pacific Oceans. While these inputs are the major nutrient sources to the AO, ocean vertical mixing is required to bring the nutrients into the photic zone. We analyze data collected in the Western Eurasian Basin (WEB) between 1980 and 2016 and characterize the nutrient climatology of the various water masses. We conclude that there were no significant trends in the concentrations of the two macronutrients that typically limit PP in the AO (nitrate and silicic acid, in the case of diatoms), except a decreasing trend for silicic acid in Polar Surface Water (PSW), which is consistent with the reported increase in PP in the AO. We suggest that the Whalers Bay polynya, located in the northwestern corner of Svalbard, may act as a mixing hotspot, creating patches of nutrient replenished PSW. These patches may then be advected to higher latitudes under the ice pack, later boosting PP upon release from light limitation or else, keeping a nutrient reservoir that may be used in a subsequent growth season. It is likely that this remaining nutrient reservoir will decrease as sea ice cover retreats and light limitation alleviates.

Published
2021

18. Warming world, changing ocean: mitigation and adaptation to support resilient marine systems

Author

Trebilco, Rowan, primary, Fleming, Aysha, additional, Hobday, Alistair J., additional, Melbourne-Thomas, Jess, additional, Meyer, Amelie, additional, McDonald, Jan, additional, McCormack, Phillipa C., additional, Anderson, Kelli, additional, Bax, Narissa, additional, Corney, Stuart P., additional, Dutra, Leo X. C., additional, Fogarty, Hannah E., additional, McGee, Jeffrey, additional, Mustonen, Kaisu, additional, Mustonen, Tero, additional, Norris, Kimberley A., additional, Ogier, Emily, additional, Constable, Andrew J., additional, and Pecl, Gretta T., additional

Published
2021
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