CS08 Biogeochemical Cycles
Date: Tuesday, June 11, 2002
Location: Poster Session - VCC
 
FahlK, Alfred Wegener Institute, Bremerhaven, Germany, kfahl@awi-bremerhaven.de
Gaye-Haake, B, , Institute of Biogeochemistry and Marine Chemistry, Hamburg, Germany, haake@geowiss.uni-hamburg.de
Noethig, E, , Alfred Wegener Institute, Bremerhaven, Germany, enoethig@awi-bremerhaven.de
 
A STUDY ON LITHOGENIC AND BIOGENIC PARTICLE FLUX IN THE EURASIAN ARCTIC
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Data on particle flux based on sediment trap studies are still very rare in the Arctic Ocean, and no results especially exist in the Eurasian and central part. Most information is from long-term deployment from the Fram Strait (Hebbeln & Wefer, 1991), Greenland Sea (von Bodungen et al., 1995), other North Atlantic areas (e.g., Honjo, 1990, 1996; Honjo & Manganini, 1993; Newton et. Al, 1994) and the Bering Sea (Takahashi, 1995). In order to enlarge our sparse knowledge about the annual flux of organic carbon and other particulate matter as well as biomarker composition and the relevance of the Arctic Ocean for the global carbon budget, preliminary results of a short- and long-term deployment from the Kara Sea (north of Yenisei, 74N, 80E) and a long-term deployment (September '95 - August '96) with two multi-sampling-traps (20 sampling cups, 150 and 1550 m below surface) from the eastern Lomonosov Ridge (81N, 140E, for further details see Rachor, 1997) are presented. The flux in the long-term sediment traps from the Lomonosov Ridge displays significant differences in vertical flux values over the year. Higher values were generally determined from mid July until end of October (4 -21 mgC / m2 / d), but absolute values differ in both traps. This was probably caused by the main outflow of the Lena River (Laptev Sea), which occurs from June to October with a maximum supply in June, and correlates well with high portions of terrigenous biomarker in both traps. During all other months sedimentation of particulate organic carbon was fairly low (0.2 - 4 mgC / m2 / d).