气候变化领域集成服务门户(CCPortal): Comparison of northeastern and southeastern U.S. watershed response to the declines in atmospheric sulfur deposition

CCPortal

DOI	10.1016/j.atmosenv.2021.118365
	Comparison of northeastern and southeastern U.S. watershed response to the declines in atmospheric sulfur deposition
	Eng L.E.; Scanlon T.M.
发表日期	2021
ISSN	1352-2310
卷号	253
英文摘要	Since the implementation of the 1970 Clean Air Act and its 1990 amendments, sulfur dioxide (SO2) emissions and subsequent sulfur (S) deposition have been declining across the eastern U.S. Although temporal patterns of deposition have been similar in the northeast (NE) and southeast (SE) regions of the U.S., stream and watershed responses have differed. This is primarily due to the spatial extent of the last glaciation, which terminated in northern Pennsylvania, rendering the soils in the SE more clay-rich and deeper than soils in the NE. Through the use of improved estimates of atmospheric deposition and more highly constrained estimates of stream export, we calculated S mass balances from New Hampshire to Georgia for 8 glaciated NE watersheds and 8 unglaciated SE watersheds that have high frequency (i.e. weekly) chemistry data available. Overall, total atmospheric S deposition declined by 70–90% from the early 1990s to the late 2010s across all sites. The resulting S budgets show that the timing of the conversion of the watersheds from net S retention to net S release differ between regions. The SE watersheds converted recently (late 2000s–2010s), while the NE watersheds have been net exporters of S since the 1990s to early 2000s. This delayed response in the SE is a consequence of the much higher sulfate (SO42−) adsorption capacity of the soils in this region. The flow normalized concentrations of SO42−, which eliminates variability due to discharge, shows that the majority of NE sites converged to similar concentrations by the mid to late 2010s, whereas the SE sites exhibit much greater spatial variability in concentrations. An evaluation of the storage and release of S within watersheds, using changes in adsorbed S and dissolved S (i.e. flow normalized concentration), suggests irreversibility of the S adsorption processes in NE and SE watersheds. The conversion of watersheds to a net release of S indicates improvements in watershed recovery due to the declines in acid deposition across the Eastern U.S. © 2021 Elsevier Ltd
关键词	Adsorption Atmospheric deposition Irreversibility Sulfate Sulfur budgets Watersheds
语种	英语
scopus关键词	Adsorption; Atmospheric chemistry; Budget control; Deposition; Digital storage; Meteorological problems; Soils; Sulfur dioxide; Atmospheric depositions; Clean air act; Irreversibility; SO$-2$; SO$-4$/$+2-$; Southeastern US; Sulphates; Sulphur budget; Sulphur deposition; Temporal pattern; Watersheds; soil organic matter; sulfur; sulfur dioxide; acid deposition; adsorption; atmospheric deposition; mass balance; sulfur dioxide; temporal analysis; watershed; acid deposition; acid rain; adsorption; Article; atmospheric deposition; budget; catchment area (hydrology); chemistry; comparative study; concentration (parameter); controlled study; Georgia (U.S.); glaciation; isotherm; New Hampshire; Pennsylvania; priority journal; United States; water supply; watershed; Georgia; New Hampshire; Pennsylvania; United States
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248486
作者单位	Department of Environmental Sciences, University of Virginia, 291 McCormick Road, Charlottesville, VA 22904, United States
推荐引用方式 GB/T 7714	Eng L.E.,Scanlon T.M.. Comparison of northeastern and southeastern U.S. watershed response to the declines in atmospheric sulfur deposition[J],2021,253.
APA	Eng L.E.,&Scanlon T.M..(2021).Comparison of northeastern and southeastern U.S. watershed response to the declines in atmospheric sulfur deposition.ATMOSPHERIC ENVIRONMENT,253.
MLA	Eng L.E.,et al."Comparison of northeastern and southeastern U.S. watershed response to the declines in atmospheric sulfur deposition".ATMOSPHERIC ENVIRONMENT 253(2021).