期刊
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
卷 57, 期 16, 页码 1446-1459出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.dsr2.2010.02.014
关键词
DOC; AOU; Mediterranean Sea; Bathypelagic layer; Levatine Intermediate Water; Deep waters
类别
资金
- European Commission [GOCE-036949]
- Italian Ministry of Research and University
Seven years (2001-2008) of dissolved organic carbon (DOC) vertical profiles were examined in order to assess the main processes determining DOC concentration and distribution in the meso- and bathypelagic layers of the Mediterranean Sea. As expected, DOC showed high and highly variable concentrations in the surface layer of 57-68 mu M (average values between 0 and 100 m), with a decrease to 44-53 mu M between 200 and 500 m. Deep DOC distribution was strongly affected by deep-water formation, with a significant increase to values of 76 mu M in recently ventilated deep waters, and low concentrations, comparable to those observed in the open oceanic waters (34-45 mu M), where the oldest, deep waters occurred. In winter 2004/2005 a deep-water formation event was observed and the consequent DOC export at depth was estimated to range between 0.76-3.02 Tg C month(-1). In the intermediate layer, the main path of the Levantine Intermediate Water (LIW) was followed in order to estimate the DOC consumption rate in its core. Multiple regression between DOC, apparent oxygen utilization (AOU), and salinity indicated that 38% of the oxygen consumption was related to DOC mineralization when the effect of mixing was removed. In deep waters of the southern Adriatic Sea a DOC decrease of 6 mu M, together with an AOU increase of 9 mu M, was observed between the end of January 2008 and the end of June 2008 (5 months). These data indicate a rate of microbial utilization of DOC of about 1.2 mu M C month(-1), with 92% of the oxygen consumption due to DOC mineralization. These values are surprisingly high for the deep sea and represent a peculiarity of the Mediterranean Sea. (C) 2010 Elsevier Ltd. All rights reserved.
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