DOI: 10.1007/s10533-013-9905-6
Scopus记录号: 2-s2.0-84896391884
论文题名: Storm event patterns of particulate organic carbon (POC) for large storms and differences with dissolved organic carbon (DOC)
作者: Dhillon G.S. ; Inamdar S.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 118, 期: 2018-01-03 起始页码: 61
结束页码: 81
语种: 英语
英文关键词: Climate change
; Organic carbon
; Runoff
; Storm events
; Water quality
; Watersheds
Scopus关键词: catchment
; climate change
; concentration (composition)
; dissolved organic carbon
; hurricane
; numerical model
; particulate organic carbon
; sediment analysis
; sediment chemistry
; soil horizon
; storm
; suspended sediment
; temporal analysis
; water quality
; watershed
; Atlantic Ocean
; Middle Atlantic Bight
; Piedmont [United States]
; United States
英文摘要: This study compared the storm event patterns, sources, and flow paths for particulate (POC) and dissolved organic carbon (DOC <0.45 μm) with a special focus on responses during large storm events. The study was conducted in a 12 ha forested catchment in the mid-Atlantic, Piedmont region of USA. A total of 14 storm events were sampled over a 16-month period (September 2010 to December 2011) including large, intense storms (precipitation >150 mm) associated with two hurricanes-Nicole (2010) and Irene (2011). Storm-event concentrations for suspended sediment (SS), POC and DOC varied between 10-7589, 0.05-252, and 0.7-18.3 mg L-1, respectively. Within-event POC concentrations continued to increase for the large hurricane storms whereas DOC displayed a dilution at peak streamflow discharge. Flow-weighted mean POC concentrations decreased for closely spaced, successive storm events whereas no such decrease was observed for DOC. These results suggest that there are important differences in the supply and transport (leaching rates and kinetics) for POC and DOC which occur at different temporal scales. The % POC content of SS was highest for the summer events. Summer events also registered a sharper increase in DOC with stream discharge and then a decline for peak flow, suggesting critical seasonal controls on storm-event POC and DOC responses. End-member mixing analysis revealed POC is transported with surface runoff while DOC is transported by saturation overland flow and rising groundwater into the soil horizons. A mixing model for sediment sources failed to identify key end-members but event mixing patterns revealed near-stream sources for small events and more distal, upland sediment sources for large and intense storms. This study highlights the need to better understand POC and DOC responses in headwater catchments especially for the large, intense, storm events that are predicted to increase in intensity with climate change. © 2013 Springer Science+Business Media Dordrecht. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83690
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Plant and Soil Sciences Department, University of Delaware, 152 Townsend Hall, 531 S. College Avenue, Newark, DE, 19716, United States; Soil Sciences Department, University of Saskatoon, Saskatoon, SK, Canada
Recommended Citation:
Dhillon G.S.,Inamdar S.. Storm event patterns of particulate organic carbon (POC) for large storms and differences with dissolved organic carbon (DOC)[J]. Biogeochemistry,2014-01-01,118(2018-01-03)