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学科主题: Meteorology & Atmospheric Sciences
题名: Regime shifts in the North Pacific simulated by a COADS-driven isopycnal model
作者: Wang, DX ; Wang, J ; Wu, LX ; Liu, ZY
关键词: North Pacific ; ventilated thermocline ; regime shift ; isopycnal model
刊名: ADVANCES IN ATMOSPHERIC SCIENCES
发表日期: 2003
卷: 20, 期:5, 页:743-754
收录类别: sci
部门归属: Chinese Acad Sci, S China Sea Inst Oceanol, LED, Guangzhou 510301, Peoples R China; CMA, Guangzhou Inst Trop Ocean & Meteorol, Guangzhou 510080, Peoples R China; Univ Alaska Fairbanks, Int Arctic Res Ctr, Fairbanks, AK 99775 USA; Univ Wisconsin, Dept Atmospher & Ocean Sci, Madison, WI 53706 USA
项目归属: LED
摘要: The Miami Isopycnal Coordinate Ocean Model (MICOM) is adopted to simulate the interdecadal variability in the Pacific Ocean with most emphasis on regime shifts in the North Pacific. The computational domain covers 60degreesN to 40degreesS with an enclosed boundary condition for momentum flux, whereas there are thermohaline fluxes across the southern end as a restoring term. In addition, sea surface salinity of the model relaxes to the climatological season cycle, which results in climatological fresh water fluxes. Surface forcing functions from January 1945 through December 1993 are derived from the Comprehensive Ocean and Atmospheric Data Set (COADS). Such a numerical experiment reproduces the observed evolution of the interdecadal variability in the heat content over the upper 400-m layer by a two-year lag. Subduction that occurs at the ventilated thermocline in the central North Pacific is also been simulated and the subducted signals propagate from 35degreesN to 25degreesN, taking about 8 to 10 years, in agreement with the eXpendable Bathy Thermograph observation over recent decades. Interdecadal signals take a southwestward and downward path rather than westward propagation, meaning they are less associated with the baroclinic planetary waves. During travel, the signals appear to conserve potential vorticity. Therefore, the ventilated thermocline and related subduction are probably the fundamental physics for interdecadal variability in the mid-latitude subtropics of the North Pacific.
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WOS记录号: WOS:000185670500006
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/5545
Appears in Collections:热带海洋环境动力实验室(LTO)_期刊论文

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Recommended Citation:
Wang, DX; Wang, J; Wu, LX; Liu, ZY.Regime shifts in the North Pacific simulated by a COADS-driven isopycnal model,ADVANCES IN ATMOSPHERIC SCIENCES,2003,20(5):743-754
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