Variation of sea surface temperature and its influence factors in the North Pacific

LIU Shan; WANG Hui; JIANG Hua; JIN Qihua

doi:10.3969/j.issn.0253-4193.2013.01.008

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LIU Shan, WANG Hui, JIANG Hua, JIN Qihua. Variation of sea surface temperature and its influence factors in the North Pacific[J]. Haiyang Xuebao, 2013, 35(1): 63-75. doi: 10.3969/j.issn.0253-4193.2013.01.008

Citation:

LIU Shan, WANG Hui, JIANG Hua, JIN Qihua. Variation of sea surface temperature and its influence factors in the North Pacific[J]. Haiyang Xuebao, 2013, 35(1): 63-75. doi: 10.3969/j.issn.0253-4193.2013.01.008

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Variation of sea surface temperature and its influence factors in the North Pacific

doi: 10.3969/j.issn.0253-4193.2013.01.008

1.
Chinese Academy of Meteorological Sciences, Beijing 100081, China
2.
National Marine Enviromental Forecasting Center, Beijing 100081, China

Received Date: 2011-08-14
Rev Recd Date: 2012-05-07

Abstract

Abstract

Based on the simple ocean data assimilation(SODA)1958-2007 monthly mean datasets and the thermal equation,the charateristics of interannual and interdecadal variability of the North Pacific sea surface temperature anomalies(SSTA)and their local factors are analyzed. The results show that,after Aleutian low deepened and moved southeastward around 1976/1977,the North Pacific SST cooled down in two regions: one is in the subtropical interior around 30°N,controlled by the wind stress anomalies;the other is located in the boundary region between the subpolar and the subtropical gyres around 40°N,controlled by the displacement of the zero wind stress curl line.In the subtropical interior region,the SST cooling reached its extreme during 1978-1982. Two main contributors are the surface heat flux and the meridional advection anomalies,which account for about 50%-60% of the SST anomalies. The residual term in the thermal equation accounts for about 20%-50% in this region. The SSTA shifted to negatives around 1975 almost simultaneously in the interior and western boundary region between the subpolar and the subtropical gyres. But the shift of vertical mixing term in the interior region occurred about 5 years earlier than in the western boundary region. Both the heatflux and the meridional advection terms are responsible for SST anomalies in this region,but the meridional advection terms dominant the SST variations during 1983-1988. The vertical mixing terms of these two regions are both small,but show strong decadal variations. The meridional advection is two times larger than the zonal advection.
- the North Pacific SST,
- horizontal advection,
- vertical mixing,

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References(43)

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