气候变化领域集成服务门户(CCPortal): Decline and Bidecadal Oscillations of Dissolved Oxygen in the Oyashio Region and Their Propagation to the Western North Pacific

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DOI	10.1029/2017GB005876
	Decline and Bidecadal Oscillations of Dissolved Oxygen in the Oyashio Region and Their Propagation to the Western North Pacific
	Sasano D.; Takatani Y.; Kosugi N.; Nakano T.; Midorikawa T.; Ishii M.
发表日期	2018
ISSN	0886-6236
EISSN	1944-9224
起始页码	909
结束页码	931
卷号	32 期号:6
英文摘要	During the period 1954–2014, concentrations of dissolved oxygen (O2) in the Oyashio region of the western subarctic North Pacific has been oscillating over bidecadal timescales and significantly decreasing over the isopycnal layer spanning σθ = 26.6–27.5 kg/m3. The cycles of oscillation (16.4–19.6 years) are almost consistent and synchronized within 1 year over this density layer and are probably controlled by the nodal tidal cycle of 18.6 years and/or atmospheric forcing. The mean rate of the long-term decrease is the highest (−0.70 ± 0.06 μmol · kg−1 · year−1) in the temperature minimum layer. The O2 decline there is predominantly attributed to a reduction of ventilation in winter due to warming and freshening. On the other hand, the O2 decline in deeper layers down to the oxygen minimum layer is attributable to a reduction in ventilation in the Sea of Okhotsk associated with a reduction in sea ice formation and propagation of its impact through diapycnal mixing adjacent to the Bussol' Strait. These trends of bidecadal oscillations and decline of O2 were also found in the downstream to the east in the 165°E section at latitudes 30°N–42.5°N on σθ = 26.8 kg/m3 and with attenuated amplitudes at latitudes of 40°N–45°N in the oxygen minimum layer on σθ = 27.4 kg/m3. These results indicate that the signal of secular declines of O2, together with bidecadal oscillations, is being propagated broadly from the Oyashio source region into the interior of the Pacific Ocean. ©2018. American Geophysical Union. All Rights Reserved.
英文关键词	bidecadal oscillation; dissolved oxygen; ocean deoxygenation; western North Pacific
语种	英语
scopus关键词	air-sea interaction; atmospheric forcing; dissolved oxygen; isopycnal layer; oxygen minimum layer; sea ice; subarctic region; tidal cycle; Bussol Strait; Kuril Islands; Oyashio Region; Pacific Ocean; Pacific Ocean (North); Russian Federation; Sakhalin; Sea of Okhotsk
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129816
作者单位	Global Environment and Marine Department, Japan Meteorological Agency, Tokyo, Japan; Oceanography and Geochemistry Research Department, Meteorological Research Institute, Tsukuba, Japan
推荐引用方式 GB/T 7714	Sasano D.,Takatani Y.,Kosugi N.,et al. Decline and Bidecadal Oscillations of Dissolved Oxygen in the Oyashio Region and Their Propagation to the Western North Pacific[J],2018,32(6).
APA	Sasano D.,Takatani Y.,Kosugi N.,Nakano T.,Midorikawa T.,&Ishii M..(2018).Decline and Bidecadal Oscillations of Dissolved Oxygen in the Oyashio Region and Their Propagation to the Western North Pacific.Global Biogeochemical Cycles,32(6).
MLA	Sasano D.,et al."Decline and Bidecadal Oscillations of Dissolved Oxygen in the Oyashio Region and Their Propagation to the Western North Pacific".Global Biogeochemical Cycles 32.6(2018).