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| Titel |
MODIS observed increase in duration and spatial extent of sediment plumes in Greenland fjords |
| VerfasserIn |
B. Hudson, I. Overeem, D. McGrath, J. P. M. Syvitski, A. Mikkelsen, B. Hasholt |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 8, no. 4 ; Nr. 8, no. 4 (2014-07-04), S.1161-1176 |
| Datensatznummer |
250116240
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| Publikation (Nr.) |
 copernicus.org/tc-8-1161-2014.pdf |
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| Zusammenfassung |
| 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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