DOI: 10.1029/2017GB005876
论文题名: Decline and Bidecadal Oscillations of Dissolved Oxygen in the Oyashio Region and Their Propagation to the Western North Pacific
作者: Sasano D. ; Takatani Y. ; Kosugi N. ; Nakano T. ; Midorikawa T. ; Ishii M.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2018
卷: 32, 期: 6 语种: 英语
英文关键词: 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
学科: bidecadal oscillation
; dissolved oxygen
; ocean deoxygenation
; western North Pacific
中文摘要: 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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160220
Appears in Collections: 气候变化与战略
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作者单位: Global Environment and Marine Department, Japan Meteorological Agency, Tokyo, Japan; Oceanography and Geochemistry Research Department, Meteorological Research Institute, Tsukuba, Japan
Recommended Citation:
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]. Global Biogeochemical Cycles,2018-01-01,32(6)