Time‐series observations of photosynthetic oxygen production in the subtropical western North Pacific by an underwater profiling buoy system
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- Tetsuichi Fujiki
- Research and Development Center for Global Change Japan Agency for Marine‐Earth Science and Technology Yokosuka Japan
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- Ryuichiro Inoue
- Research and Development Center for Global Change Japan Agency for Marine‐Earth Science and Technology Yokosuka Japan
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- Makio C. Honda
- Research and Development Center for Global Change Japan Agency for Marine‐Earth Science and Technology Yokosuka Japan
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- Masahide Wakita
- Mutsu Institute for Oceanography Japan Agency for Marine‐Earth Science and Technology Mutsu Japan
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- Yoshihisa Mino
- Institute for Space‐Earth Environmental Research Nagoya University Nagoya Japan
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- Chiho Sukigara
- Tokyo University of Marine Science and Technology Tokyo Japan
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- Osamu Abe
- Graduate School of Environmental Studies Nagoya University Nagoya Japan
書誌事項
- 公開日
- 2019-11-12
- 資源種別
- journal article
- 権利情報
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- http://creativecommons.org/licenses/by/4.0/
- DOI
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- 10.1002/lno.11372
- 公開者
- Wiley
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説明
<jats:title>Abstract</jats:title><jats:p>We conducted time‐series observations in the northwestern part of the North Pacific subtropical gyre (30°N, 145°E) from July 2012 to March 2013 using a profiling buoy system equipped with a fast repetition rate fluorometer and dissolved oxygen (DO) sensor in order to understand vertical and temporal variations in gross oxygen production (GOP) by phytoplankton and its contribution to the oxygen cycle in the upper ocean. Under stratified conditions (July–November), daily GOP slightly exceeded 2 mmol O<jats:sub>2</jats:sub> m<jats:sup>−3</jats:sup> d<jats:sup>−1</jats:sup> and only in near‐surface waters. However, during periods of vertical mixing (December–March) when phytoplankton blooms occurred, daily GOP increased in the upper 30 m and often exceeded 5 mmol O<jats:sub>2</jats:sub> m<jats:sup>−3</jats:sup> d<jats:sup>−1</jats:sup>. The depth‐integrated daily GOP within the euphotic layer (∫GOP<jats:sub>EL</jats:sub>) was relatively low (84.0 ± 23.6 mmol O<jats:sub>2</jats:sub> m<jats:sup>−2</jats:sup> d<jats:sup>−1</jats:sup>) during stratification, but increased gradually with vertical mixing and reached 460 mmol O<jats:sub>2</jats:sub> m<jats:sup>−2</jats:sup> d<jats:sup>−1</jats:sup> on 17 March 2013. Additionally, during stratified conditions, a subsurface oxygen maximum (SOM) formed below the mixed‐layer depth (MLD) because the steep density gradient constrained upward diffusion of oxygen produced below the MLD. During the period of vertical mixing, the SOM disappeared, and DO concentrations within the upper 100 m increased through both increasing ∫GOP<jats:sub>EL</jats:sub> and atmospheric oxygen uptake. Using our buoy observations and air–sea gas flux model, we estimated that 24% ± 7% of ∫GOP<jats:sub>EL</jats:sub> was emitted to the atmosphere during the stratification period, and ∫GOP<jats:sub>EL</jats:sub> during the mixing period was about 2.4 times the rate of oxygen uptake by the ocean from the atmosphere.</jats:p>
収録刊行物
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- Limnology and Oceanography
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Limnology and Oceanography 65 (5), 1072-1084, 2019-11-12
Wiley
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詳細情報 詳細情報について
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- CRID
- 1361694364643849600
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- ISSN
- 19395590
- 00243590
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- Web Site
- https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Flno.11372
- https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11372
- https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11372
- https://onlinelibrary.wiley.com/doi/am-pdf/10.1002%2Flno.11372
- https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11372
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- 資料種別
- journal article
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- データソース種別
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- Crossref
- KAKEN
- OpenAIRE
