The author(s) chose to restrict access to this thesis to current Whitman students, faculty, and staff. Please log in to view it.
Glaciomarine sediment flux and transportation mechanisms, Kronebreen/Kongsvegan, Kongsfjorden, Svalbard
Barnhart, Theodore B.
May 12, 2010
Geology - Environmental Studies
Arctic tidewater glaciers are likely to respond rapidly to changes in climate, due to a variety of climate forcing mechanisms. This study is designed to assess how these glaciers are now responding to these changes. We collected marine sediment samples near Kronebreen/Kongsvegan, a polythermal subpolar tidewater glacier in Kongsfjorden, Svalbard, over the summer melt season of 2009. CTD/OBS and meteorological data were also collected to characterize this dynamic Arctic system. One-to-three-day modern sediment records were collected near the top, the middle, and the bottom of the fjord water column with mooring locations ranging in depth from 20 to 120 m below sea level. Accumulation rates from the bottommost sediment traps of 380, 220, and 160 kg/m²/yr were found at 0.45, 0.75, and 1.00 km, respectively, from the ice-marginal delta on the southern edge of Kronebreen/Kongsvegan. Sedimentation rates appear to decrease logarithmically away from the ice-marginal delta. Couplets of coarse and ne sediment were found in sediment traps from the meltwater sediment plume indicating a diurnal meltwater discharge pattern. The couplets may be due more to solar incidence than to temperature and precipitation. Tidal current velocity may play a role in differentiating coarse and fine particles as they are released from the meltwater sediment plume, but there is not sufficient evidence to test for this fully.
If you have questions about permitted uses of this content, please contact the Arminda administrator: http://works.whitman.edu/contact-arminda