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《大气科学进展(英文版)》 2013-01
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Intraseasonal Oscillation in Global Ocean Temperature Inferred from Argo

HU Ruijin 1 and WEI Meng 2 1 Physical Oceanography Laboratory and Ocean-Atmosphere Interaction and Climate Laboratory,Ocean University of China,Qingdao 266100 2 Jiaozhou Meteorological Bureau,Jiaozhou,Qingdao 266300  
The intraseasonal oscillation(ISO;14-97-day periods) of temperature in the upper 2000 m of the global ocean was studied based on Argo observations from 2003-2008.It is shown that near the surface the ISO existed mainly in a band east of 60 E,between 10 S and 10 N,and the region around the Antarctic Circumpolar Current(ACC).At other levels analyzed,the ISOs also existed in the regions of the Kuroshio,the Gulf Stream,the Indonesian throughflow,the Somalia current,and the subtropical countercurrent(STCC) of the North Pacific.The intraseasonal signals can be seen even at depths of about 2000 m in some regions of the global ocean.The largest amplitude of ISO appeared at the thermocline of the equatorial Pacific,Atlantic and Indian Ocean,with maximum standard deviation(STD) exceeding 1.2 C.The ACC,the Kuroshio,and the Gulf Stream regions all exhibited large STD for all levels analyzed.Especially at 1000 m,the largest STD appeared in the south and southeast of South Africa—a part of the ACC,with a maximum value that reached 0.5 C.The ratios of the intraseasonal temperature variance to the total variance at 1000 m and at the equator indicated that,in a considerable part of the global deep ocean,the ISO was dominant in the variations of temperature,since such a ratio exceeded even 50% there.A case study also confirmed the existence of the ISO in the deep ocean.These results provide useful information for the design of field observations in the global ocean.Analysis and discussion are also given for the mechanism of the ISO.
【Fund】: supported by the National Basic Research Program of China (2007CB816004);; the National Natural Science Foundation of China (Grant Nos.41076004 40830106 and 40921004)
【CateGory Index】: P731.11
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