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• W2074017963 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 223:27-38 (2001) - doi:10.3354/meps223027 Dissolved and suspended organic carbon in the Atlantic sector of the Southern Ocean. Stock dynamics in upper ocean waters M. D. Doval1,*, X. A. Álvarez-Salgado1, J. M. Gasol2, L. M. Lorenzo1, I. Mirón1, F. G. Figueiras1, C. Pedrós-Alió2 1CSIC, Instituto de Investigación Mariñas, Eduardo Cabello 6, 36208 Vigo, Spain 2CSIC, Institut de Ciències del Mar, Passeig Joan de Borbó s/n, 08039 Barcelona, Spain *E-mail: marylo@iim.csic.es ABSTRACT: Dissolved and suspended organic carbon (DOC and POC) distributions were studied in the undersampled Atlantic sector of the Southern Ocean during Cruise HE052 of the ŒBio Hespérides¹ in December 1998. The coastal waters of the ice edge, the Gerlache Strait, and the open-ocean waters of the Weddell Sea and the Drake Passage were sampled. The high correlation between chlorophyll a (chl a), DOC and POC suggest that a considerable fraction (estimated at 15 to 30%) of the organic matter available in the upper mixed layer of the different study regions is the product of synthesis and early degradation of planktonic primary production. Relatively low renewal times (≤2 wk) of this material, except in the Polar Front Zone (>5 were deduced from measured primary/bacterial production rates. Maximum contributions of this potentially bioreactive organic carbon pool (TOCB) to the total organic carbon (TOC) were observed in the highly productive waters of the ice edge (24%) and Gerlache Strait (30%) regions, where high chl a levels and shallow upper mixed layers (due to marked salinity gradients) occurred. DOC represented 42 and 56% of TOCB, in these regions, respectively. In contrast, TOCB comprised ≤20% of TOC in the less productive open-ocean waters of the Weddell Sea and Drake Passage, where DOC made up ≥65% of TOCB. The Subantarctic Zone constituted an exception, with high chl a levels and a shallow upper (due to marked temperature gradients): 29% of the organic carbon in the upper mixed layer was TOCB, 68% of which was in the dissolved fraction. Accumulation of DOC in the study regions points to a reduction in bacterial activity through mechanisms other than substrate limitation. KEY WORDS: Dissolved and suspended organic carbon · Primary and bacterial production · Carbon renewal time · Drake Passage · Southern Ocean Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 223. Online publication date: November 28, 2001 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2001 Inter-Research." @default.
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• W2074017963 title "Dissolved and suspended organic carbon in the Atlantic sector of the Southern Ocean. Stock dynamics in upper ocean waters" @default.
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