期刊
GEOPHYSICAL RESEARCH LETTERS
卷 48, 期 6, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2020GL091394
关键词
dissolved oxygen; net community production; phytoplankton bloom; profiling float; sea ice melt; seasonal ice zone
资金
- NOAA Grant [NA15OAR4320063]
- Ministry of Education, Culture, Sports, Science and Technology in Japan [17H00775, 17H01157, 20H05707]
- Grants-in-Aid for Scientific Research [17H01157, 17H00775, 20H05707] Funding Source: KAKEN
The data collected by profiling floats deployed in the Sea of Okhotsk indicate that sea-ice melt may be a significant factor in promoting phytoplankton blooms, especially in the southwestern region where iron availability is limited. Sea-ice melt likely induces prominent phytoplankton blooms by providing iron supply.
Seven profiling floats equipped with oxygen sensors deployed in the Sea of Okhotsk provide time series data for 33 cases of spring phytoplankton bloom period, including 9 cases in which sea ice existed just before the bloom (prior-ice case). As an index of biological productivity, we calculated net community production (NCP) based on the increasing oxygen rate using the Redfield ratio. The total NCP in the euphotic layer averaged for prior-ice cases is 31.3 mmolC m(-2) day(-1)), similar to 3 times higher than that of non-ice cases. In addition to intensification of surface stratification, other factors of sea-ice melt likely enhance the bloom. The influence of sea-ice melt is particularly large in the southwestern region, where the iron availability likely limits phytoplankton growth. A suggested scenario is that when the sea ice containing sediment/iron is transported from the northern shelves, a prominent bloom is induced via the iron supply by sea-ice melt.
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