中国东部近海热含量季节变化及影响因素分析

Study on Seasonal Variation of Heat Content in Marginal Seas in the East of China

利用实测海水温度、盐度资料和SODA,NCEP/NCAR再分析资料,分析了渤、黄、东海热含量和海气界面净热通量及海洋平流输送热量的季节变化。结果表明,用SODA资料与用实测资料计算得到的热量输送的变化趋势比较一致。计算海域中海水热含量具有明显的季节变化特征,最大值出现在9月份,最小值出现在2,3月份。海表净热通量与海洋平流热量输送在不同的月份对海域海水热含量变化的作用与季节有关,5~8月渤、黄、东海通过海气界面获得的净表面热量大于通过海洋平流输送的热量,两者都使热含量增加。从9月到次年3月,海气界面净热通量为负,海洋通过海表面失去热量,特别是在冬季,海水失去热量比较多,而平流输送就弥补了部分热量散失。

Seasonal variation of heat content in marginal seas in the east of China is studied by using observational data of sea temperature and salinity and oceanic reanalysis data from SODA.Results show that heat transports calculated from observational and from reanalysis data are similar.There are obvious seasonal variations of heat content in the marginal seas.The maximum value is in September and minimum value is in February and March.Net heat flux down from sea surface and heat transports by ocean current reveal different significance for the variation of heat content in different seasons.The seas gain more heat through air-sea surface than by ocean advection during May to August,and in other months the situation is contrary.From September to March next year,the seas lose heat through air-sea surface,especially much in winter.Then heat transports by advection make up part of the loses in this area.