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Relationship between the Asian-Pacific oscillation and the tropical cyclone frequency in the western North Pacific

Science china Earth Sciences 2008年第3期51卷 380-385页

作者： zhou botao1, cui xuan2.& zhao ping3 1 laboratory for climate studies,{2., china Meteorological Administration, beijing 100081, china 2.national Meteorological center, china Meteorological Administration, beijing 100081, china 3 Chinese Academy of Meteorological Sciences, china Meteorological Administration, beijing 100081, china 1. laboratory for climate {2. National Climate Center China Meteorological Administration Beijing 100081 China 2. national Meteorological center China Meteorological Administration Beijing 100081 China 3. Chinese Academy of Meteorological Sciences China Meteorological Administration Beijing 100081 China

The relationship between the Asian-Pacific oscillation (APO) and the tropical cyclone frequency over the western North Pacific (WNP) in summer is preliminarily investigated through an analysis of ob- served data. The result has shown clearly that APO is significantly and positively correlated to the tropical cyclone frequency in the WNP. If APO is above (below) the normal in summer, more (less) tropical cyclones will tend to appear in the WNP. The present study also addresses the large-scale at- mospheric general circulation changes underlying the linkage between APO and the WNP tropical cy- clone frequency. It follows that a positive phase of summer APO is concurrent with weakened as well as northward and eastward located western Pacific subtropical high (WPSH), low-level convergence and high-level divergence, and reduced vertical zonal wind shear in the WNP, providing favorable envi- ronment for the tropical cyclone genesis, and thus more tropical cyclones will come into being, and vice versa.

关键词： Asian-Pacific oscillation western North Pacific tropical cyclone atmospheric circulation

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Linkage between the Asian-Pacific Oscillation and the sea surface temperature in the North Pacific

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Chinese Science Bulletin 2010年第12期55卷 1193-1198页

作者： zhou botao {2. ping cui xuan national climate {2. China Meteorological Administration Beijing 100081 China national Meteorological Information center China Meteorological Administration Beijing 100081 China national Meteorological center China Meteorological Administration Beijing 100081 China

The linkage between the Asian-Pacific Oscillation (APO) and the sea surface temperature (SST) in the North Pacific during the summertime (June-August) is preliminarily investigated through an analysis of observed *** is found that APO is significantly and positively correlated to the North Pacific SST,with the correlation coefficient being 0.58 on the interannual timescale during the period 1954-2.03,which suggests that a strong (weak) APO corresponds to high (low) SST in the North *** in-phase relationship is well supported by the dynamic and thermal conditions in association with the APO *** APO is in the positive phase,the East Asian westerly jet in the upper troposphere is weakened,and the anomalous anticyclonic circulation prevails in the low-troposphere over the North ***,the negative anomaly of the sensible and latent heat fluxes is predominated in the North Pacific,indicating ocean gets heat flux from the ***,warm water advection northward is strengthened in the North *** of these provide beneficial conditions to warm the North Pacific SST,and thus the SST is increased in this region,and vice versa.

关键词：北太平洋海表温度亚洲涛动太平洋海温年际时间尺度潜热通量海表面温度

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