DOI: 10.1002/2017JG004259
Scopus记录号: 2-s2.0-85044405143
论文题名: Effects of Extreme Events on Arsenic Cycling in Salt Marshes
作者: Northrup K. ; Capooci M. ; Seyfferth A.L.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 3 起始页码: 1086
结束页码: 1100
语种: 英语
英文关键词: arsenic
; desorption
; hurricane
; ionic strength
; salinity
英文摘要: Extreme events such as storm surges, intense precipitation, and supermoons cause anomalous and large fluctuations in water level in tidal salt marshes, which impacts the sediment biogeochemistry that dictates arsenic (As) cycling. In addition to changes in water level, which impacts soil redox potential, these extreme events may also change salinity due to freshwater inputs from precipitation or saltwater inputs due to surge. It is currently unknown how As mobility in tidal salt marshes will be impacted by extreme events, as fluctuations in salinity and redox potential may act synergistically to mobilize As. To investigate impacts of extreme events on As cycling in tidal salt marshes, we conducted a combined laboratory and field investigation. We monitored pore water and soil samples before, during, and after two extreme events: a supermoon lunar eclipse followed by a storm surge and precipitation induced by Hurricane Joaquin in fall 2015 at the St. Jones Reserve in Dover, Delaware, a representative tidal salt marsh in the Mid-Atlantic United States. We also conducted soil incubations of marsh sediments in batch and in flow-through experiments in which redox potential and/or salinity were manipulated. Field investigations showed that pore water As was inversely proportional to redox potential. During the extreme events, a distinct pulse of As was observed in the pore water with maximum salinity. Combined field and laboratory investigations revealed that this As pulse is likely due to rapid changes in salinity. These results have implications for As mobility in the face of extreme weather variability. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114369
Appears in Collections: 气候减缓与适应
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作者单位: Department of Plant and Soil Science, University of Delaware, Newark, DE, United States
Recommended Citation:
Northrup K.,Capooci M.,Seyfferth A.L.. Effects of Extreme Events on Arsenic Cycling in Salt Marshes[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(3)