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Sea-air exchange pa...
Sea-air exchange patterns along the central and outer East Siberian Arctic Shelf as inferred from continuous CO2, stable isotope, and bulk chemistry measurements
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Humborg, Christoph (author)
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Geibel, Marc C. (author)
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Anderson, Leif G. (author)
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Björk, Göran (author)
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Mörth, Carl-Magnus (author)
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Sundbom, Marcus (author)
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Thornton, Brett F. (author)
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Deutsch, Barbara (author)
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Gustafsson, Erik (author)
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Gustafsson, Bo (author)
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Ek, Jörgen (author)
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Semiletov, Igor (author)
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- 2017
- 2017
- English.
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In: Global Biogeochemical Cycles. - 0886-6236. ; 31:7, 1173-1191
Abstract
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- This large-scale quasi-synoptic study gives a comprehensive picture of sea-air CO2 fluxes during the melt season in the central and outer Laptev Sea (LS) and East Siberian Sea (ESS). During a 7 week cruise we compiled a continuous record of both surface water and air CO2 concentrations, in total 76,892 measurements. Overall, the central and outer parts of the ESAS constituted a sink for CO2, and we estimate a median uptake of 9.4 g C m(-2) yr(-1) or 6.6 Tg C yr(-1). Our results suggest that while the ESS and shelf break waters adjacent to the LS and ESS are net autotrophic systems, the LS is a net heterotrophic system. CO2 sea-air fluxes for the LS were 4.7 g C m(-2) yr(-1), and for the ESS we estimate an uptake of 7.2 g C m(-2) yr(-1). Isotopic composition of dissolved inorganic carbon (delta C-13(DIC) and delta C-13(CO2)) in the water column indicates that the LS is depleted in delta C-13(DIC) compared to the Arctic Ocean (ArcO) and ESS with an offset of 0.5% which can be explained by mixing of delta C-13(DIC)-depleted riverine waters and 4.0 Tg yr(-1) respiration of OCter; only a minor part (0.72 Tg yr(-1)) of this respired OCter is exchanged with the atmosphere. Property-mixing diagrams of total organic carbon and isotope ratio (delta C-13(SPE-DOC)) versus dissolved organic carbon (DOC) concentration diagram indicate conservative and nonconservative mixing in the LS and ESS, respectively. We suggest land-derived particulate organic carbon from coastal erosion as an additional significant source for the depleted delta C-13(DIC).
Subject headings
- Natural Sciences (hsv)
- Earth and Related Environmental Sciences (hsv)
- Naturvetenskap (hsv)
- Geovetenskap och miljövetenskap (hsv)
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Humborg, Christo ...
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Geibel, Marc C.
-
Anderson, Leif G ...
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Björk, Göran
-
Mörth, Carl-Magn ...
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Sundbom, Marcus
-
show more...
-
Thornton, Brett ...
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Deutsch, Barbara
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Gustafsson, Erik
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Gustafsson, Bo
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Ek, Jörgen
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Semiletov, Igor
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show less...
- By the university
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