北太平洋副热带模态水形成区潜沉率的年际变化及其机制

胡海波; 刘秦玉; 刘伟

北太平洋副热带模态水形成区潜沉率的年际变化及其机制

中国海洋大学, 物理海洋实验室, 海洋-大气相互作用及气候实验室, 山东, 青岛, 266003

基金项目: 国家自然科学基金项目(40333030;40276009)

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出版历程
- 收稿日期: 2005-06-05
- 修回日期: 2006-01-11

Interannual and decadal variation of the subduction rate in the subtropical mode water formation regions in the North Pacific

Physical Oceanography Laboratory and Ocean-Atmosphere Interaction and Climate Laboratory, Ocean University of China, Qingdao 266003, China

摘要

摘要: 根据Huang和Qiu 1995年的潜沉率计算公式,采用同化的海洋模式资料和海洋-大气界面的通量观测资料,计算了北太平洋副热带海域3个模态水形成区逐年的潜沉率,研究了潜沉率产生年际变化的机制.研究结果表明:西部、中部和东部3个模态水形成区潜沉率的年际变化主要周期分别为6,2~5和2 a;北太平洋副热带模态水的3个形成区的潜沉率都发现年代际的变化特征:在1985年以前,西部模态水形成区的潜沉率年际变化最为显著,但1985后年际变化振幅明显减小;在中部模态水形成区,1975~1992年间潜沉率随时间的变化的振幅较大,潜沉率在这段时间内的平均值也达到33.99 m/a,而在1970~1975年间和1993~1998年间潜沉率都小于20 m/a;西部副热带模态水形成区的潜沉率的年际变化与这里海面的净热通量的年际变化有很好的相关性,中部副热带模态水形成区潜沉率的年际变化则取决于局地Ekman流的年际变化,而在东部模态水形成区局地风应力旋度的变化直接影响潜沉率的大小.
- 潜沉率 /
- 北太平洋副热带模态水 /
- 年际变化 /
- 年代际变化
Abstract: Annual subduction rate in the subtropical mode water (STMW) formation regions in the Nort hPacific has been calculated from the assimilated ocean model data and the observation of the flux between the ocean and atmosphere by using Huang's equation of subduction rate (1995),and the mechanism in its interannual variation is further studied.It has been found that the significant periods of the subduction rate are respectively 6 a in the western STMW formation region,2~5 a in the central STMW formation region and 2 a in eastern STMW formation region Besides,decadal variations exist in all regions:interannual variations of the subduction rate in the western STMW formation region were stronger before 1985 and then trail off with weaker amplitudes.In the central STMW formation region,the amplitudes for interannual variations were greater between 1975 and 1992,corresponding to a mean value of the subduction rate of 33.99 m/a,much bigger than two other spans (1970~1975 and 1993~1998) There was an abrupt change of the subduction rate in the eastern STMW formation region between 1992 and 1993,the mean value of the subduction rate changed from 46.31 m/a to 22.02 m/a around 1992,in the western STMW formation region.In the analysis,the correlation is good between variations of the subduction rate and the netheat flux in the western STMW formation region,and variations of the subduction rate in the central STMW formation region are deter mined by variations of local Ekman mass transports and the geostrophic currents.While in the eastern STMW formation region,the subduction rate is directly determ ined by the cure of the wind.
- subduction rate /
- subtropical mode water /
- interannual variation /
- decadal variation

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参考文献(20)

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