基于Argo资料的热带西太平洋上层热含量初步研究-海洋预报

基于Argo资料的热带西太平洋上层热含量初步研究

单位：1. 国家海洋局第二海洋研究所, 杭州310012;
2. 国家海洋局第二海洋研究所, 杭州310012;
3. 中国科学院海洋研究所, 中国科学院海洋环流与波动重点实验室, 青岛266071

分类号：研究与分析

出版年·卷·期（页码）：2011·28·第四期（76-86）

摘要：

根据2004年1月-2008年12月间的Argo剖面浮标观测资料,分析了热带西太平洋上层热含量的空间分布及其季节变化特征,并考察了不同计算深度以及盐度对热含量的影响,且探讨了有关计算上层热含量的深度选取问题。结果表明:(1)热带西太平洋上层热含量的气候态大致呈"马鞍型"分布,即在12°N以北和5°S以南海域上层热含量都较高,而在2°-12°N之间热含量则较低,特别在棉兰老冷涡区热含量很低;(2)研究海域的上层热含量一年四季均呈这种两高一低的空间分布形势,但强度的季节性变幅却较大,整个研究海域的热含量体现为春季最高,夏季最低,秋冬季居中的特点,但两个高热含量区和低热含量带的热含量各呈现出不同的季节变化;(3)温跃层深度的波动对海洋上层热含量的影响要大于上混合层,尤其在南北纬10°以外海域。因此,计算西太平洋上层热含量时,应将积分深度取为温跃层下界深度,才有可能比较真实地反映该海域的上层热含量的分布和变化,若为简单起见,取等深度计算时,以700 m为宜,此外,盐度对上层热含量的影响也应引起重视。

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.

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