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Sea-air exchange patterns along the central and outer East Siberian Arctic Shelf as inferred from continuous CO2, stable isotope, and bulk chemistry measurements

Artikel i vetenskaplig tidskrift
Författare Christoph Humborg
Marc C. Geibel
Leif G Anderson
Göran Björk
Carl Magnus Mörth
Marcus Sundbom
Brett F. Thornton
Barbara Deutsch
Erik Gustafsson
Bo Gustafsson
Jörgen Ek
Igor Semiletov
Publicerad i Global Biogeochemical Cycles
Volym 31
Nummer/häfte 7
Sidor 1173–1191
ISSN 0886-6236
Publiceringsår 2017
Publicerad vid Institutionen för marina vetenskaper
Sidor 1173–1191
Språk en
Länkar dx.doi.org/10.1002/2017GB005656
Ämnesord Air-sea flux, Carbon, Carbon isotope, Climate change, Respiration, Siberian Shelf
Ämneskategorier Klimatforskning

Sammanfattning

This large-scale quasi-synoptic study gives a comprehensive picture of sea-air CO 2 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 CO 2 concentrations, in total 76,892 measurements. Overall, the central and outer parts of the ESAS constituted a sink for CO 2 , 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. CO 2 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 (δ 13 C DIC and δ 13 C CO2 ) in the water column indicates that the LS is depleted in δ 13 C DIC compared to the Arctic Ocean (ArcO) and ESS with an offset of 0.5‰ which can be explained by mixing of δ 13 C DIC -depleted riverine waters and 4.0 Tg yr -1 respiration of OC ter ; only a minor part (0.72 Tg yr -1 ) of this respired OC ter is exchanged with the atmosphere. Property-mixing diagrams of total organic carbon and isotope ratio (δ 13 C 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 δ 13 C DIC .

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