期刊
CRYOSPHERE
卷 8, 期 4, 页码 1161-1176出版社
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/tc-8-1161-2014
关键词
-
资金
- NSF-OPP Award [0909349]
The freshwater flux from the Greenland Ice Sheet (GrIS) to the North Atlantic Ocean carries extensive but poorly documented volumes of sediment. We develop a suspended sediment concentration (SSC) retrieval algorithm using a large Greenland specific in situ data set. This algorithm is applied to all cloud-free NASA Moderate Resolution Imaging Spectrometer (MODIS) Terra images from 2000 to 2012 to monitor SSC dynamics at six river plumes in three fjords in southwest Greenland. Melt-season mean plume SSC increased at all but one site, although these trends were primarily not statistically significant. Zones of sediment concentration > 50 mg L-1 expanded in three river plumes, with potential consequences for biological productivity. The high SSC cores of sediment plumes (> 250 mg L-1) expanded in one-third of study locations. At a regional scale, higher volumes of runoff were associated with higher melt-season mean plume SSC values, but this relationship did not hold for individual rivers. High spatial variability between proximal plumes highlights the complex processes operating in Greenland's glacio-fluvial-fjord systems.
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