气候变化领域集成服务门户(CCPortal): Mechanisms Driving Decadal Changes in the Carbonate System of a Coastal Plain Estuary

CCPortal

DOI	10.1029/2021JC017239
	Mechanisms Driving Decadal Changes in the Carbonate System of a Coastal Plain Estuary
	Da F.; Friedrichs M.A.M.; St-Laurent P.; Shadwick E.H.; Najjar R.G.; Hinson K.E.
发表日期	2021
ISSN	21699275
卷号	126 期号:6
英文摘要	Understanding decadal changes in the coastal carbonate system is essential for predicting how the health of these waters responds to anthropogenic drivers, such as changing atmospheric conditions and riverine inputs. However, studies that quantify the relative impacts of these drivers are lacking. In this study, the primary drivers of decadal trends in the surface carbonate system, and the spatiotemporal variability in these trends, are identified for a large coastal plain estuary: the Chesapeake Bay. Experiments using a coupled three-dimensional hydrodynamic-biogeochemical model highlight that, over the past three decades, the changes in the surface carbonate system of Chesapeake Bay have strong seasonal and spatial variability. The greatest surface pH and aragonite saturation state (ΩAR) reductions have occurred in the summer in the middle (mesohaline) Bay: −0.24 and −0.9 per 30 years, respectively, with increases in atmospheric CO2 and reductions in nitrate loading both being primary drivers. Reductions in nitrate loading have a strong seasonal influence on the carbonate system, with the most pronounced decadal decreases in pH and ΩAR occurring during the summer when primary production is strongly dependent on nutrient availability. Increases in riverine total alkalinity and dissolved inorganic carbon have raised surface pH in the upper oligohaline Bay, while other drivers such as atmospheric warming and input of acidified ocean water through the Bay mouth have had comparatively minor impacts on the estuarine carbonate system. This work has significant implications for estuarine ecosystem services, which are typically most sensitive to surface acidification in the spring and summer seasons. © 2021. The Authors.
英文关键词	anthropogenic drivers; carbonate system; Chesapeake Bay; coastal acidification; decadal trends
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/186277
作者单位	Virginia Institute of Marine Science, William & Mary, Gloucester Point, VA, United States; CSIRO Oceans and Atmosphere, Hobart, TAS, Australia; Department of Meteorology and Atmospheric Science, The Pennsylvania State University, University ParkPA, United States
推荐引用方式 GB/T 7714	Da F.,Friedrichs M.A.M.,St-Laurent P.,et al. Mechanisms Driving Decadal Changes in the Carbonate System of a Coastal Plain Estuary[J],2021,126(6).
APA	Da F.,Friedrichs M.A.M.,St-Laurent P.,Shadwick E.H.,Najjar R.G.,&Hinson K.E..(2021).Mechanisms Driving Decadal Changes in the Carbonate System of a Coastal Plain Estuary.Journal of Geophysical Research: Oceans,126(6).
MLA	Da F.,et al."Mechanisms Driving Decadal Changes in the Carbonate System of a Coastal Plain Estuary".Journal of Geophysical Research: Oceans 126.6(2021).