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《Marine Forecasts》 2011-04
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A preliminary study on upper ocean heat content of tropical Western Pacific

WU Xiao-fen1,XU Jian-ping1,2,ZHANG Qi-long3,SUN Zhao-hui1(1.Second Institute of Oceanography,SOA,Hangzhou 310012 China;2.State Key Lab of Satellite Ocean Environment Dynamics,SOA,Hangzhou 310012 China;3.Key Laboratory of Ocean Circulation and Wave,CAS,Qingdao 266071 China)  
The spatial distribution and seasonal variations of the upper ocean heat content(UOHC) over the tropical western Pacific have been studied;The differences between UOHC and the heat content within 2.5m,mixed layer and 400m,the effect of salinity on ocean Heat content,and the integral range in ocean heat content estimation also be analyzed,by using Argo profiling data from 2004 to 2008.The main results indicated that:(1)the distribution of the tropical Western Pacific UOHC was just like "horse saddle," the value of UOHC was higher in the region of the north of 12°N and south of 5°S,while it's lower between the region from 2°N to 12°N,especially in the Mindanao Cold Eddy.This spatial distribution maintains all the year.(2)the strength of UOHC change with season and its amplitude is large.The value of total UOHC was the highest in Spring,the lowest in Summer and a medium in Winter and Autumn.The characteristics of its seasonal change in the region of north of 12°N and south of 6°S where the UOHC is high are different with that in the region from 2°N to 12°N where the UOHC is low.(3)The fluctuation of thermocline depth has a much greater influence on UOHC than mixed lay-er,especially in the region of the north of 10°N and south of 10°S,therefore,in order to get more accurate UO-HC data for analysis and it can truly reflect the thermal structure of the tropical western Pacific,when calculating the UOHC of tropical western Pacific,the integral depth should be the bottom of thermocline,while for simplici-ty,700 m is a better choice.In addition,the impact of salinity on UOHC should also be taken into account.
【Key Words】: heat content mixed layer thermocline Argo profiling data tropical Western Pacific
【Fund】: 国家重点基础研究发展规划(“973”)项目(2007CB816000);; 国家海洋局青年海洋科学基金项目(1059—50)
【CateGory Index】: P733.4
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