热带太平洋混合层盐度季节-年际变化特征研究

发布时间：2018-06-13 23:02

本文选题：Argo + 热带太平洋　；参考：《热带气象学报》2016年02期

【摘要】：基于2004年1月-2013年12月的Argo及卫星遥感等观测数据,运用经验正交函数(EOF)方法分析了热带太平洋混合层盐度(MLS)的时空特征并探讨其物理机制。结果表明:热带西太平洋混合层盐度呈现出明显的递增趋势,南太平洋辐合带(SPCZ)区域尤为显著,而南热带太平洋东部的混合层则有变淡的趋势。在季节时间尺度上,MLS在如下的4个区域呈现显著变化:西太平洋暖池、赤道东太平洋美洲沿岸、赤道辐合带(ITCZ)和SPCZ。利用盐收支方程进一步定量分析了两个代表区域(暖池区和ITCZ区)的MLS变化率及其控制因子,研究发现:暖池区淡水通量长年表现为负值,且随季节变化波动不大。除6、7月之外,水平平流对MLS变化率均有正的贡献,其峰期出现在10-12月。ITCZ区的淡水通量存在显著季节变化,其下半年的贡献明显大于上半年,水平平流输送和混合层底的夹卷也在11月达到最大。暖池区的盐度变化主要受到水平平流的影响,混合层底的夹卷作用贡献相对较小,而在ITCZ区混合层底的夹卷贡献作用则更显著。
[Abstract]:Based on the observation data of Argo and satellite remote sensing in January 2004 -2013, the spatio-temporal characteristics of the tropical Pacific mixed layer salinity (MLS) are analyzed by using the empirical orthogonal function (EOF) method and its physical mechanism is discussed. The results show that the salinity of the mixed layer in the tropical western Pacific presents an obvious increasing trend, and the South Pacific convergence zone (SPCZ) region. The mixed layer in the eastern part of the south tropical Pacific has a weak trend. On the seasonal time scale, the MLS is significantly changed in the following 4 regions: the Western Pacific warm pool, the eastern equatorial Pacific coast, the equatorial convergence zone (ITCZ) and the SPCZ. utilization of the salt budget are further quantitative analysis of the two representative regions (warm pool and I). The change rate of MLS and its control factors in the TCZ area showed that the fresh water flux in the warm pool area was negative and fluctuated little with the seasonal variation. Except for the 6,7 months, the horizontal advection had a positive contribution to the change rate of MLS, and the fresh water flux in the peak period of the 10-12 month.ITCZ region existed in a significant seasonal change, and the contribution of the second half of the year was obviously greater than that of the second half of the year. In the first half of the year, the horizontal advection and mixed layer bottom clamps reached the largest in November. The salinity changes in the warm pool area were mainly affected by horizontal advection, and the contribution of the mixing layer at the bottom of the mixed layer was relatively small, while the entrainment contribution at the bottom of the ITCZ zone was more significant.
【作者单位】：中国科学院南海海洋研究所/热带海洋环境国家重点实验室;中国科学院大学;
【基金】：中国科学院战略性先导科技专项(XDA11010203) 国家973计划项目资助(2013CB430301)共同资助
【分类号】：P731.12

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