气候变化领域集成服务门户(CCPortal): Alkalinity in Tidal Tributaries of the Chesapeake Bay

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DOI	10.1029/2019JC015597
	Alkalinity in Tidal Tributaries of the Chesapeake Bay
	Najjar R.G.; Herrmann M.; Cintrón Del Valle S.M.; Friedman J.R.; Friedrichs M.A.M.; Harris L.A.; Shadwick E.H.; Stets E.G.; Woodland R.J.
发表日期	2020
ISSN	21699275
卷号	125 期号:1
英文摘要	Despite the important role of alkalinity in estuarine carbon cycling, the seasonal and decadal variability of alkalinity, particularly within multiple tidal tributaries of the same estuary, is poorly understood. Here we analyze more than 25,000 alkalinity measurements, mostly from the 1980s and 1990s, in the major tidal tributaries of the Chesapeake Bay, a large, coastal-plain estuary of eastern North America. The long-term means of alkalinity in tidal-fresh waters vary by a factor of 6 among seven tidal tributaries, reflecting the alkalinity of nontidal rivers draining to these estuaries. At 25 stations, mostly in the Potomac River Estuary, we find significant long-term increasing trends that exceed the trends in the nontidal rivers upstream of those stations. Box model calculations in the Potomac River Estuary indicate that the main cause of the estuarine trends is a declining alkalinity sink. The magnitude of this sink is consistent with a simple model of calcification by the invasive bivalve Corbicula fluminea. More generally, in tidal tributaries fed by high-alkalinity nontidal rivers, alkalinity is consumed, with sinks ranging from 8% to 27% of the upstream input. In contrast, tidal tributaries that are fed by low-alkalinity nontidal rivers have sources of alkalinity amounting to 34% to 171% of the upstream input. For a single estuarine system, the Chesapeake Bay has diverse alkalinity dynamics and can thus serve as a laboratory for studying the numerous processes influencing alkalinity among the world's estuaries. © 2019. American Geophysical Union. All Rights Reserved.
英文关键词	alkalinity; biogeochemistry; carbon cycle; estuaries
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/187039
作者单位	Department of Meteorology and Atmospheric Science, The Pennsylvania State University, University Park, PA, United States; Physics Department, University of Puerto Rico, Mayagüez Campus, Mayagüez, Puerto Rico; Virginia Institute of Marine Science, William & Mary, Gloucester Point, VA, United States; Chesapeake Biological Laboratory, University of Maryland Center for Environmental Science, Solomons, MD, United States; CSIRO, Oceans & Atmosphere, Hobart, TAS, Australia; United States Geological Survey, Mounds View, MN, United States
推荐引用方式 GB/T 7714	Najjar R.G.,Herrmann M.,Cintrón Del Valle S.M.,et al. Alkalinity in Tidal Tributaries of the Chesapeake Bay[J],2020,125(1).
APA	Najjar R.G..,Herrmann M..,Cintrón Del Valle S.M..,Friedman J.R..,Friedrichs M.A.M..,...&Woodland R.J..(2020).Alkalinity in Tidal Tributaries of the Chesapeake Bay.Journal of Geophysical Research: Oceans,125(1).
MLA	Najjar R.G.,et al."Alkalinity in Tidal Tributaries of the Chesapeake Bay".Journal of Geophysical Research: Oceans 125.1(2020).