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22 results on '"Xiong, Jilian"'

1. Using observed bacteria concentration and modeled transit time under an analytical framework to estimate overall removal rate of fecal coliform in an estuary

Author

Du, Jiabi, Shen, Jian, Park, Kyeong, Yu, Xin, Ye, Fei, Qin, Qubin, Xiong, Jilian, and Chen, Yu

Subjects
Physics - Atmospheric and Oceanic Physics
Abstract

Abundance of fecal coliform (FC) is widely used to indicate the potential presence of pathogens, the No.1 cause of water impairments in the U.S. Despite extensive monitoring efforts, assessing and modeling FC pollution still faces challenges, largely owing to the uncertainties in estimation of overall removal rate (K). This study proposes an alternative method to estimate in situ K by combining observational data, hydrodynamic simulation, and analytical solution. The method requires the observed spatial distribution of FC concentration along an estuarine channel and the numerically-simulated transit time, and converts the K estimation from a temporal problem into a spatial problem, potentially reducing survey duration, effort, and cost. Application of the method gave an estimation of K = 0.5 d-1 on average for the Nassawadox Creek in Chesapeake Bay. The numerical and analytical model results with the estimated K agreed well with the observation, demonstrating the credibility of the method.

Published
2020

5. Intercomparisons of Tracker v1.1 and four other ocean particle-tracking software packages in the Regional Ocean Modeling System.

Author

Xiong, Jilian and MacCready, Parker

Subjects
*INTEGRATED software, *MARINE biology, *CIRCULATION models, *OCEAN circulation, *OCEAN
Abstract

Particle tracking is widely utilized to study transport features in a range of physical, chemical, and biological processes in oceanography. In this study, a new offline particle-tracking package, Tracker v1.1, is introduced, and its performance is evaluated in comparison to an online Eulerian dye, one online particle-tracking software package, and three offline particle-tracking software packages in a small, high-resolution model domain and a large coarser model domain. It was found that both particle and dye approaches give similar results across different model resolutions and domains when they were tracking the same water mass, as indicated by similar mean advection pathways and spatial distributions of dye and particles. The flexibility of offline particle tracking and its similarity against online dye and online particle tracking make it a useful tool to complement existing ocean circulation models. The new Tracker was shown to be a reliable particle-tracking package to complement the Regional Ocean Modeling System (ROMS) with the advantages of platform independence and speed improvements, especially in large model domains achieved by the nearest-neighbor search algorithm. Lastly, trade-offs of computational efficiency, modifiability, and ease of use that can influence the choice of which package to use are explored. The main value of the present study is that the different particle and dye tracking codes were all run on the same model output or within the model that generated the output. This allows some measure of intercomparison between the different tracking schemes, and we conclude that all choices that make each tracking package unique do not necessarily lead to very different results. [ABSTRACT FROM AUTHOR]

Published
2024
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7. Better Together: Early Career Aquatic Scientists Forge New Connections at Eco‐DAS XV

Author

Graham, Olivia J., primary, Al‐Haj, Alia, additional, Arrington, Eleanor C., additional, Arsenault, Emily R., additional, Barbosa, Carolina C., additional, Bice, Kadir, additional, Brahmstedt, Evie, additional, Bryant, S. River D., additional, Cai, Xun, additional, Calhoun‐Grosch, Stacy, additional, Culpepper, Joshua, additional, Dale, Katherine, additional, Detweiler, Derek J., additional, Doughty, Katlin D., additional, Emery, Kyle A., additional, Gadeken, Kara, additional, Griffiths, Laura, additional, Hosseini, Atefeh, additional, Jones, Catriona, additional, Miraly, Hadis, additional, Mott, Alexander W., additional, Münzner, Karla, additional, Ogashawara, Igor, additional, Olson, Carly R., additional, Rabaey, Joseph S., additional, Rich, Walter A., additional, Rogers, Phoenix A., additional, Seeley, Meredith Evans, additional, Selak, Lorena, additional, Shangguan, Qipei, additional, Solomon, Kelsey J., additional, Sun, Xinyu, additional, Tassone, Spencer J., additional, Thellman, Audrey, additional, Tracey, John, additional, Xiong, Jilian, additional, and Xue, Tianfei, additional

Published
2023
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9. Intercomparisons of five ocean particle tracking software packages

Author

Xiong, Jilian and MacCready, Parker

Abstract

Particle tracking is widely utilized to study transport features in a range of physical, chemical, and biological processes in oceanography. In this study, a new offline particle tracking package, Tracker, is introduced and its performance is evaluated in comparison to an online Eulerian dye, one online and three offline particle tracking software packages in a small high-resolution (200 m) model domain and a large coarser (1000 m) model domain. It was found that both particle and dye approaches give similar results across different model resolutions and domains when they were tracking the same water mass, as indicated by similar mean advection pathways and spatial distributions of dye and particles. The flexibility of offline particle tracking and its similarity against online dye and particle tracking make it a useful tool to complement existing ocean circulation models. Lastly, the new Tracker was shown to be a reliable particle tracking package to complement the Regional Ocean Modeling System (ROMS), and tradeoffs of performance, modifiability, and ease of use that can influence the choice of which package to use are discussed.

Published
2023

16. Data supplementing article 'Vertical Transport Timescale of Surface-Produced Particulate Material in Chesapeake Bay' submitted to the Journal of Geophysical Research: Oceans

Author

Xiong, Jilian and Shen, Jian

Abstract

Thisdataset supplements the article: Xiong, J., Shen, J., Vertical Transport Timescale of Surface-Produced Particulate Material in Chesapeake Bay, submitted totheJournal of Geophysical Research: Oceans contact: Jilian Xiong, jxiong@vims.edu or xiongjilian@gmail.com

Published
2021
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