Journal
CONTINENTAL SHELF RESEARCH
Volume 24, Issue 12, Pages 1271-1283Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.csr.2004.04.004
Keywords
sedimentary denitrification; N/P ratio; Bering Sea; nitrogen cycle; nitrogen isotope; nitrate
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Anomalously low ratios of dissolved inorganic nitrogen (DIN) to dissolved inorganic phosphorus (DIP) were found in a well-oxygenated cold bottom water over the southeastern Bering Sea shelf during late summer. Our study shows that the anomalously low DIN/DIP ratios are caused by sedimentary denitrification. The estimated sedimentary denitrification rates, ranging from 0.7 to 1.5 mmol/m(2)/day, are similar to values previously reported for continental shelf regions. An annual rate of sedimentary denitrification in the Bering Sea shelf can be, at a low limit, in the order of 2.5 Tg N/yr. This corresponds to roughly one-third of the annual net supply of the nitrate to the Bering Sea shelf and, at least, 2.5% of annual global denitrification rate in oceanic sediments, implying that the sedimentary denitrification in the Bering Sea shelf could be a significant sink of nitrogen in both regional and global scales. (C) 2004 Elsevier Ltd. All rights reserved.
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