The Prominent Spring Bloom and Its Relation to Sea‐Ice Melt in the Sea of Okhotsk, Revealed by Profiling Floats
Abstract 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 calcul...
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| Format: | Article |
| Language: | English |
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Wiley
2021-03-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2020GL091394 |
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| author | S. Kishi K. I. Ohshima J. Nishioka N. Isshiki S. Nihashi S. C. Riser |
| author_facet | S. Kishi K. I. Ohshima J. Nishioka N. Isshiki S. Nihashi S. C. Riser |
| author_sort | S. Kishi |
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| description | Abstract 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), ∼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. |
| format | Article |
| id | doaj-art-c494aff628d54f2bb16606f6dc9d9f12 |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2021-03-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-c494aff628d54f2bb16606f6dc9d9f122025-08-20T02:11:09ZengWileyGeophysical Research Letters0094-82761944-80072021-03-01486n/an/a10.1029/2020GL091394The Prominent Spring Bloom and Its Relation to Sea‐Ice Melt in the Sea of Okhotsk, Revealed by Profiling FloatsS. Kishi0K. I. Ohshima1J. Nishioka2N. Isshiki3S. Nihashi4S. C. Riser5Graduate School of Environmental Science Hokkaido University Sapporo JapanInstitute of Low Temperature Science Hokkaido University Sapporo JapanInstitute of Low Temperature Science Hokkaido University Sapporo JapanGraduate School of Environmental Science Hokkaido University Sapporo JapanDepartment of Engineering for Innovation National Institute of Technology Tomakomai College Tomakomai JapanSchool of Oceanography University of Washington Seattle WA USAAbstract 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), ∼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.https://doi.org/10.1029/2020GL091394dissolved oxygennet community productionphytoplankton bloomprofiling floatsea ice meltseasonal ice zone |
| spellingShingle | S. Kishi K. I. Ohshima J. Nishioka N. Isshiki S. Nihashi S. C. Riser The Prominent Spring Bloom and Its Relation to Sea‐Ice Melt in the Sea of Okhotsk, Revealed by Profiling Floats Geophysical Research Letters dissolved oxygen net community production phytoplankton bloom profiling float sea ice melt seasonal ice zone |
| title | The Prominent Spring Bloom and Its Relation to Sea‐Ice Melt in the Sea of Okhotsk, Revealed by Profiling Floats |
| title_full | The Prominent Spring Bloom and Its Relation to Sea‐Ice Melt in the Sea of Okhotsk, Revealed by Profiling Floats |
| title_fullStr | The Prominent Spring Bloom and Its Relation to Sea‐Ice Melt in the Sea of Okhotsk, Revealed by Profiling Floats |
| title_full_unstemmed | The Prominent Spring Bloom and Its Relation to Sea‐Ice Melt in the Sea of Okhotsk, Revealed by Profiling Floats |
| title_short | The Prominent Spring Bloom and Its Relation to Sea‐Ice Melt in the Sea of Okhotsk, Revealed by Profiling Floats |
| title_sort | prominent spring bloom and its relation to sea ice melt in the sea of okhotsk revealed by profiling floats |
| topic | dissolved oxygen net community production phytoplankton bloom profiling float sea ice melt seasonal ice zone |
| url | https://doi.org/10.1029/2020GL091394 |
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