期刊
CONTINENTAL SHELF RESEARCH
卷 59, 期 -, 页码 28-36出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.csr.2013.04.004
关键词
Phytoplankton; Bering Sea; Chukchi Sea; Carbon uptake rates; IPY
类别
资金
- Korea Research Foundation (KRF)
- Korea government (MEST) [2011-0007761]
- NOAA Office of Arctic Research through CIFAR grant [NA080AR4320751]
- National Research Foundation of Korea [2011-0007761] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The Bering and Chukchi Seas are well known to be one of the most productive regions in the world. However, these regions have many climate induced-environmental changes over the last decades. Whether these changes enhance or reduce the overall primary production is important in major ecosystems of the Bering and Chukchi Seas. During the Oshoro Maru cruise in 2007 as an IPY (International Polar Year) event of Hokkaido University, nitrogen and carbon uptake rates of phytoplankton were measured at 15 productivity stations in the Bering and Chukchi Seas, using a C-13-N-15 dual isotope tracer technique. The 2007 mean daily carbon uptake rates of phytoplankton were 0.20 and 0.16 g C m(-2) d(-1), respectively in the southern and northern Bering Sea. These rates are lower than those reported previously in the regions mainly because of the well-known strong seasonal variation of the carbon uptake rate between May (bloom period) and July (post-bloom period; this cruise). In the Chukchi Sea, the mean uptake rates from this study were 1.63 and 0.18 g C m(-2) d(-1), respectively in the central and northern regions which are noticeably lower than those reported previously in decades ago. Based on the enhancement experiments, light is an important controlling factor for the phytoplankton productivity rates in the Bering and Chukchi Seas during the cruise period as indicated by higher carbon uptake rates with increased light conditions. Accordingly, nutrients might not be the controlling factor, given there were only minimal increases of primary productivity rates with higher nitrate concentrations. (C) 2013 Elsevier Ltd. All rights reserved.
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