气候变化领域集成服务门户(CCPortal): Modeling Spatiotemporal Patterns of Ecosystem Metabolism and Organic Carbon Dynamics Affecting Hypoxia on the Louisiana Continental Shelf

CCPortal

DOI	10.1029/2019JC015630
	Modeling Spatiotemporal Patterns of Ecosystem Metabolism and Organic Carbon Dynamics Affecting Hypoxia on the Louisiana Continental Shelf
	Jarvis B.M.; Lehrter J.C.; Lowe L.L.; Hagy J.D.; Wan Y.; Murrell M.C.; Ko D.S.; Penta B.; Gould R.W.; Jr.
发表日期	2020
ISSN	21699275
卷号	125 期号:4
英文摘要	The hypoxic zone on the Louisiana Continental Shelf (LCS) forms each summer due to nutrient-enhanced primary production and seasonal stratification associated with freshwater discharges from the Mississippi/Atchafalaya River Basin (MARB). Recent field studies have identified highly productive shallow nearshore waters as an important component of shelf-wide carbon production contributing to hypoxia formation. This study applied a three-dimensional hydrodynamic-biogeochemical model named CGEM (Coastal Generalized Ecosystem Model) to quantify the spatial and temporal patterns of hypoxia, carbon production, respiration, and transport between nearshore and middle shelf regions where hypoxia is most prevalent. We first demonstrate that our simulations reproduced spatial and temporal patterns of carbon production, respiration, and bottom-water oxygen gradients compared to field observations. We used multiyear simulations to quantify transport of particulate organic carbon (POC) from nearshore areas where riverine organic matter and phytoplankton carbon production are greatest. The spatial displacement of carbon production and respiration in our simulations was created by westward and offshore POC flux via phytoplankton carbon flux in the surface layer and POC flux in the bottom layer, supporting heterotrophic respiration on the middle shelf where hypoxia is frequently observed. These results support existing studies suggesting the importance of offshore carbon flux to hypoxia formation, particularly on the west shelf where hypoxic conditions are most variable. ©2020 American Geophysical Union. This article has been contributed to by US Government employees and their work is in the public domain in the USA.
英文关键词	Carbon; Hypoxia; Louisiana Continental Shelf; Primary Production; Respiration
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186907
作者单位	Office of Research and Development, U.S. EPA, Gulf Breeze, FL, United States; Department of Marine Sciences, University of South Alabama, Mobile, AL, United States; Dauphin Island Sea Lab, Dauphin Island, AL, United States; Office of Information Technology, Advanced Computing, North Carolina State University, Raleigh, NC, United States; Naval Research Laboratory, Stennis Space Center, MS, United States
推荐引用方式 GB/T 7714	Jarvis B.M.,Lehrter J.C.,Lowe L.L.,et al. Modeling Spatiotemporal Patterns of Ecosystem Metabolism and Organic Carbon Dynamics Affecting Hypoxia on the Louisiana Continental Shelf[J],2020,125(4).
APA	Jarvis B.M..,Lehrter J.C..,Lowe L.L..,Hagy J.D..,Wan Y..,...&Jr..(2020).Modeling Spatiotemporal Patterns of Ecosystem Metabolism and Organic Carbon Dynamics Affecting Hypoxia on the Louisiana Continental Shelf.Journal of Geophysical Research: Oceans,125(4).
MLA	Jarvis B.M.,et al."Modeling Spatiotemporal Patterns of Ecosystem Metabolism and Organic Carbon Dynamics Affecting Hypoxia on the Louisiana Continental Shelf".Journal of Geophysical Research: Oceans 125.4(2020).