DOI: 10.1002/2014GB005065
Scopus记录号: 2-s2.0-84939257749
论文题名: Multidecadal trends of oxygen and their controlling factors in the western North Pacific
作者: Sasano D ; , Takatani Y ; , Kosugi N ; , Nakano T ; , Midorikawa T ; , Ishii M
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2015
卷: 29, 期: 7 起始页码: 935
结束页码: 956
语种: 英语
英文关键词: dissolved oxygen
; ocean deoxygenation
; ocean warming
; western North Pacific
Scopus关键词: concentration (composition)
; decadal variation
; dissolved oxygen
; global warming
; isopycnal layer
; oxygen minimum layer
; solubilization
; transition zone
; Pacific Ocean
; Pacific Ocean (North)
英文摘要: The rate of change of dissolved oxygen (O2 ) concentrations was analyzed over 1987-2011 for the high-frequency repeat section along 165°E in the western North Pacific. Significant trends toward decreasing O2 were detected in the northern subtropical to subtropical-subarctic transition zones over a broad range of isopycnal horizons. On 25.3σθ between 25°N and 30°N in North Pacific Subtropical Mode Water, the rate of O2 decrease reached -0.45 ± 0.16 μmol kg-1 yr-1. It is largely attributed to a deepening of isopycnal horizons and to a reduction in oxygen solubility associated with ocean warming. In North Pacific Intermediate Water, the rate of O2 decrease was elevated (-0.44 ± 0.14 μmol kg-1 yr-1 on 26.8σθ ) and was associated with net increases in apparent oxygen utilization in the source waters. On 27.3σθ in the subtropical Oxygen Minimum Layer (OML) between 32.5°N and 35°N, the rate of O2 decrease was significant (-0.22 ± 0.05 μmol kg-1 yr-1). It was likely due to the increases in westward transport of low-oxygen water. These various drivers controlling changes in O2 along the 165°E section are the same as those acting along 137°E (analyzed previously) and also account for the differences in the rate of O2 decrease between these sections. Additionally, in the tropical OML near 26.8σθ between 5°N and 10°N, significant trends toward increasing O2 were detected in both sections (+0.36 ± 0.04 μmol kg-1 yr-1 in the 165°E section). These results demonstrate that warming and circulation changes are causing multidecadal changes in dissolved O2 over wide expanses of the western North Pacific. ©2015. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77968
Appears in Collections: 气候变化事实与影响
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作者单位: Oceanography and Geochemistry Research Department, Meteorological Research Institute, Tsukuba, Japan; Global Environment and Marine Department, Japan Meteorological Agency, Tokyo, Japan
Recommended Citation:
Sasano D,, Takatani Y,, Kosugi N,et al. Multidecadal trends of oxygen and their controlling factors in the western North Pacific[J]. Global Biogeochemical Cycles,2015-01-01,29(7)