期刊
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
卷 149, 期 -, 页码 206-217出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.dsr2.2018.03.003
关键词
Carbon export; Biological carbon pump; Intra-season variability; High-salinity shelf water; Recalcitrant carbon
类别
资金
- Brazilian Ministry of the Environment (MMA)
- Brazilian Ministry of Science, Technology, Innovation and Communication (MCTIC)
- Council for Research and Scientific Development of Brazil (CNPq) through Brazilian National Institute of Science and Technology of Cryosphere (INCT-CRIOSFERA) [573720/2008-8]
- INTERBIOTA (CNPq) [407889/2013-2]
- CAPES/CMAR2 (CAPES) [23038.001421/2014-30]
- CNPq [302604/2015-4]
- CAPES/PNPD
- NAUTILUS (CNPq) [405869/2013-4]
Dissolvedorganic carbon (DOC) was determined at the Gerlache Strait, a coastal area off the Northern Antarctic Peninsula, in the austral summers of 2015 and 2016 during NAUTILUS I and II cruises, respectively. Hydrographic conditions in the area were very different between the study years. Despite that, the surface mixed layer displayed higher DOC concentrations compared to intermediate and deeper waters, as a result of the strong water column stratification, for both years. DOC accumulation on the surface is significantly related to the net community production (NCP), and stronger when the nitrate surface deficit (Delta NO3-) is higher (2016). The presence of a surface/subsurface thermal front at the central Gerlache Strait likely promotes the export of surface-produced organic carbon to deeper layers. A weak correlation between DOC and apparent oxygen utilization (AOU) suggests that the degradationof organic carbon in the deeper water column has a small role in oxygen consumption (less than 10%). This recalcitrant DOC characteristic below the surface layers observed in this study is similar to that found twenty years ago in the same area (FRUELA campaign, early Summer 1995). The Gerlache Strait allows, as an adequate regional scale study, assessments on the efficiency of the export and distribution of organic carbon in deep water masses in view of the observed trends of freshening, cooling, and lightening in the Antarctic Peninsula shelf waters.
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