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DOI10.1016/j.scitotenv.2017.10.279
Watershed export of fine sediment, organic carbon, and chlorophyll-a to Chesapeake Bay: Spatial and temporal patterns in 1984-2016
Zhang, Qian1; Blomquist, Joel D.2
发表日期2018-04-01
ISSN0048-9697
卷号619页码:1066-1078
英文摘要

Chesapeake Bay has long experienced nutrient enrichment and water clarity deterioration. This study provides new quantification of loads and yields for sediment (fine and coarse grained), organic carbon (total, dissolved, and particulate), and chlorophyll-a from the monitored nontidal Chesapeake Bay watershed (MNTCBW), all of which are expected to drive estuarine water clarity. We conducted an integrated analysis of nine major tributaries to the Bay to understand spatial and temporal export patterns over the last thirty years (1984-2016). In terms of spatial pattern, export of these constituents from the MNTCBW was strongly dominated (similar to 90%) by the three largest tributaries (i.e., Susquehanna, Potomac, and James). Among the nine tributaries, the ranking of constituent export generally follows the order of their watershed sizes, with other factors such as land use and reservoir playing important roles in some exceptions. In terms of partitioning, suspended sediment (SS) export was dominated by fine-grained sediment (SSfine) in all nine tributaries; overall, similar to 90% of the MNTCBW SS is SSfine. Total organic carbon (TOC) export was dominated by dissolved organic carbon (DOC) in all tributaries except Potomac River; overall, similar to 60% of the MNTCBW TOC is DOC. A comparison with literature shows that the MNTCBW SS and TOC yields were similar to 80% and similar to 60% of the respective medians of worldwide watersheds. In terms of temporal pattern, flow-normalized yields from the MNTCBW show overall increases in SS (both long-term [1984-2016] and short-term [2004-2016]), SSfine (long-term and short-term), TOC (long-term), and chlorophyll-a (short-term). The rises in SS, SSfine, and TOC were largely driven by Susquehanna River where Conowingo Reservoir's trapping efficiency has greatly diminished in the last twenty years. Overall, these new results on the status and trends of sediment, organic carbon, and chlorophyll-a provide the foundation for building potential linkages between riverine inputs and estuarine water clarity patterns. (c) 2017 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).


英文关键词River monitoring;Statistical modeling;Trend analysis;Water clarity;Water quality;WRTDS
语种英语
WOS记录号WOS:000424144200108
来源期刊SCIENCE OF THE TOTAL ENVIRONMENT
来源机构美国环保署
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/59701
作者单位1.Univ Maryland, Ctr Environm Sci, US EPA, Chesapeake Bay Program, 410 Severn Ave,Suite 112, Annapolis, MD 21403 USA;
2.US Geol Survey, Dist Columbia Water Sci Ctr, 5522 Res Pk Dr, Baltimore, MD 21228 USA
推荐引用方式
GB/T 7714
Zhang, Qian,Blomquist, Joel D.. Watershed export of fine sediment, organic carbon, and chlorophyll-a to Chesapeake Bay: Spatial and temporal patterns in 1984-2016[J]. 美国环保署,2018,619:1066-1078.
APA Zhang, Qian,&Blomquist, Joel D..(2018).Watershed export of fine sediment, organic carbon, and chlorophyll-a to Chesapeake Bay: Spatial and temporal patterns in 1984-2016.SCIENCE OF THE TOTAL ENVIRONMENT,619,1066-1078.
MLA Zhang, Qian,et al."Watershed export of fine sediment, organic carbon, and chlorophyll-a to Chesapeake Bay: Spatial and temporal patterns in 1984-2016".SCIENCE OF THE TOTAL ENVIRONMENT 619(2018):1066-1078.
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