气候变化领域集成服务门户(CCPortal): Impacts of Marine Heatwaves on Subsurface Temperatures and Dissolved Oxygen in the Chesapeake Bay

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DOI	10.1029/2023JC020338
	Impacts of Marine Heatwaves on Subsurface Temperatures and Dissolved Oxygen in the Chesapeake Bay
	Shunk, Nathan P.; Mazzini, Piero L. F.; Walter, Ryan K.
发表日期	2024
ISSN	2169-9275
EISSN	2169-9291
起始页码	129
结束页码	3
卷号	129 期号:3
英文摘要	Subsurface impacts associated with Marine Heatwaves (MHWs) in estuaries are not well understood, largely due to data scarcity. Using over three decades (1986-2021) of observations from several monitoring programs, this study investigates subsurface temperature and dissolved oxygen (DO) anomalies associated with surface MHWs in the Chesapeake Bay (CB). Seasonal variability in temperature anomalies followed a simple 1-D response to surface heating with downward heat transport and diffusion controlled by seasonally variable stratification and mixing. Two distinct temperature regimes were found: a thermally stratified spring-summer regime, when positive temperature anomalies were confined to the surface mixed layer (SML); and a homogeneous fall-winter regime. Additionally, surface (subsurface) temperatures were elevated for months (days to weeks) before and after MHWs, indicating individual events were shorter than the timescales of elevated temperatures. A simple 1-D SML heat budget identified air-estuary heat flux changes as the leading driver of MHW onsets and declines, with latent heat flux being the dominant term. DO anomaly patterns were more complex, with considerable along-channel gradients. Notable DO decreases (1-4 mg L-1) primarily occurred in the winter/spring below the SML, and the hypoxic zone expanded from spring through fall. Only a small fraction of these DO anomalies could be attributed to MHW temperature-induced solubility changes, demonstrating that other physical and/or biogeochemical processes dominate changes in DO during these events. In CB, concurrent low DO and persistent high temperatures could compound the impacts of MHWs on this valuable ecosystem, with MHW event impacts likely to be exacerbated by climate change.
英文关键词	marine heatwave; estuary; subsurface; dissolved oxygen; heat budget; Chesapeake Bay
语种	英语
WOS研究方向	Oceanography
WOS类目	Oceanography
WOS记录号	WOS:001176861900001
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/289210
作者单位	William & Mary; Virginia Institute of Marine Science; California State University System; California Polytechnic State University San Luis Obispo
推荐引用方式 GB/T 7714	Shunk, Nathan P.,Mazzini, Piero L. F.,Walter, Ryan K.. Impacts of Marine Heatwaves on Subsurface Temperatures and Dissolved Oxygen in the Chesapeake Bay[J],2024,129(3).
APA	Shunk, Nathan P.,Mazzini, Piero L. F.,&Walter, Ryan K..(2024).Impacts of Marine Heatwaves on Subsurface Temperatures and Dissolved Oxygen in the Chesapeake Bay.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,129(3).
MLA	Shunk, Nathan P.,et al."Impacts of Marine Heatwaves on Subsurface Temperatures and Dissolved Oxygen in the Chesapeake Bay".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 129.3(2024).