中国近海海温年际年代际振荡关键海区分析研究  

A study of SST decadal oscillation in China Sea

作　　者：张志华[1] 陈幸荣[1] 蔡怡[1] 

机构地区：[1]国家海洋环境预报中心,北京100081

出　　处：《海洋预报》2012年第4期1-6,共6页Marine Forecasts

基　　金：国家自然科学基金(40976015);国家"973"项目(2010CB950302)

摘　　要：用HADLEY中心的HadISST的海温资料、NCEP的大气资料、国家气象局发布的74个月平均环流指数和美国华盛顿大学的PDO指数,讨论研究了中国近海海温的年际年代际振荡。通过对我国近海海温的EOF分析,可以发现我国近海30 N附近是海温年际年代际振荡信号最强的关键区,它占了总量的58.2%,与澳大利亚东北沿海海温年代际振荡有相同的周期,最明显周期是44—45年,滞后PDO信号近15年左右。该关键区海温与澳大利亚东北沿海海温都还存在1年、5年和15年的振荡,它们的相关系数达到0.604,属于同一个模态。另外,1年的海温振荡信号除了澳大利亚东北沿岸以外,还沿着西太平洋海岸线分布,因此中国近海海温年际年代际振荡不是一种局地现象,而与太平洋海温变化有关。另外,它是海气相互作用的结果,与中高纬度的东亚大槽和低纬度太平洋印度洋的风场、西太平洋副高和南海副高、大气温度场甚至南半球环流有明显的关系。Based on the HadlSST data from HADLEY Center, geopotential height at 500 hPa and air tempera- ture and wind at 850hPa from NCEP, 74-month averaged circulation index from Chinese Meteorology Adminis- tration and PDO index from Washington University, the SST decadal oscillation in China Sea is analyzed by EOF method. The results show that the key area is close to 30~N in the East of the China Sea, where showing strongest SST decadal oscillation and. It takes account about 58.2 % of total amount. The period of SST decadal oscillation in the key area of the China Sea is same as that in the northeast coast of the Australia Ocean. The period of the strongest signal SST decadal oscillation is 44--45 years, showing a lag of 15 years with PDO. The SST oscilla- tion in the key area of the China Sea and in the northeast coast of the Australia Ocean share the same periods with 1 year, 5 years and 15 years and the correlation coefficient is 0.604, suggesting that they are in the same mode. There is also 1 year period in the western Pacific coast. The results indicate that the SST decadal oscillation in the key area of the China Sea is not a local event, but connects to the sea temperature in the Pacific Ocean. It is the re- suits of the air---sea interaction, being related with the wind from mid-high and low latitude, the subtropical high in the west Pacific Ocean and the South China Sea, the air temperature and the circulation in the southern hemi- sphere.

关 键 词：中国近海海温 海温年际年代际振荡 关键海区 

分 类 号：P732[天文地球—海洋科学]