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

HU Hai-bo; LIU Qin-yu; LIU Wei

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HU Hai-bo, LIU Qin-yu, LIU Wei. Interannual and decadal variation of the subduction rate in the subtropical mode water formation regions in the North Pacific[J]. Haiyang Xuebao, 2006, 28(2): 22-28.

Citation:

HU Hai-bo, LIU Qin-yu, LIU Wei. Interannual and decadal variation of the subduction rate in the subtropical mode water formation regions in the North Pacific[J]. Haiyang Xuebao, 2006, 28(2): 22-28.

HU Hai-bo, LIU Qin-yu, LIU Wei. Interannual and decadal variation of the subduction rate in the subtropical mode water formation regions in the North Pacific[J]. Haiyang Xuebao, 2006, 28(2): 22-28.

Citation:

HU Hai-bo, LIU Qin-yu, LIU Wei. Interannual and decadal variation of the subduction rate in the subtropical mode water formation regions in the North Pacific[J]. Haiyang Xuebao, 2006, 28(2): 22-28.

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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

Received Date: 2005-06-05
Rev Recd Date: 2006-01-11

Abstract

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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References(20)

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