Regime shifts in the North Pacific simulated by a COADS-driven isopycnal model
Wang, DX; Wang, J; Wu, LX; Liu, ZY
2003
发表期刊ADVANCES IN ATMOSPHERIC SCIENCES
ISSN0256-1530
卷号20期号:5页码:743-754
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.
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
关键词North Pacific Ventilated Thermocline Regime Shift Isopycnal Model
学科领域Meteorology & Atmospheric Sciences
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收录类别sci
资助项目LED
WOS记录号WOS:000185670500006
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被引频次:8[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/5545
专题热带海洋环境国家重点实验室(LTO)
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Wang, DX,Wang, J,Wu, LX,et al. Regime shifts in the North Pacific simulated by a COADS-driven isopycnal model[J]. ADVANCES IN ATMOSPHERIC SCIENCES,2003,20(5):743-754.
APA Wang, DX,Wang, J,Wu, LX,&Liu, ZY.(2003).Regime shifts in the North Pacific simulated by a COADS-driven isopycnal model.ADVANCES IN ATMOSPHERIC SCIENCES,20(5),743-754.
MLA Wang, DX,et al."Regime shifts in the North Pacific simulated by a COADS-driven isopycnal model".ADVANCES IN ATMOSPHERIC SCIENCES 20.5(2003):743-754.
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