Air–water exchange and vertical profiles of organic carbon in a subarctic fjord
In this article, we examine the air–sea exchange of exchangeable organic carbon (OC) as well as the internal pools and sources within a subarctic fjord. Air–water fluxes of OC ranged from an uptake of 22 6 10 mmol C m22 d21 in winter to a release of 2 6 8 mmol C m22 d21 in the fall, sizable compared...
| Published in: | Limnology and Oceanography |
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| Main Authors: | , , , , , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
American Society of Limnology and Oceanography
2010
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10261/44053 https://doi.org/10.4319/lo.2010.55.4.1733 |
| Summary: | In this article, we examine the air–sea exchange of exchangeable organic carbon (OC) as well as the internal pools and sources within a subarctic fjord. Air–water fluxes of OC ranged from an uptake of 22 6 10 mmol C m22 d21 in winter to a release of 2 6 8 mmol C m22 d21 in the fall, sizable compared to that of CO2 (average uptake of 136 mmol C m22 d21 for the fall and 2.6 6 0.84 mmol C m22 d21 in the winter). The water column profiles of exchangeable dissolved organic carbon (EDOC) followed closely those of dissolved organic carbon (DOC), and EDOC represented, on average, about one-third of DOC. The dynamic characteristic and active cycling of EDOC was evidenced by incubation experiments performed on each fjord compartment (sediment, water column, macroalgae) where sediments and macroalgae were found to be substantial sources and the water column acted as a strong sink of EDOC. This research was funded by the Commission for Scientific Research in Greenland, a complementary action of the Spanish Ministry of Science and Technology (reference CGL2007-28773-E/ANT), the Greenland Ecosystem Monitoring program (http://www.g-e-m.dk), and the Arctic Tipping Points project (http://www.eu-atp.org) funded by FP7 of the European Union (contract 226248). Peer reviewed |
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