基于多源卫星观测的黄海冷水团海平面高度变化调制机理研究

The Yellow Sea Cold Water Mass (YSCWM) is one of the most important hydrology features of the Yellow Sea (YS). The occurrence and development of YSCWM can influence the thermal and haline distribution of the YS bottom water, and thus is related to the steric height and further to the sea level variation. However, seldom are there any published papers study the mechanism of the YSCWM affecting the sea level variations. Using multi-sensor satellite observations, in-situ measurements and reanalysis datasets with multiple data processing methods, the proposed project aims to investigate the spatial and temporal distribution of the YSCWM steric height, separate the multiply time scale oceanic processes involved in the sea level variation, and finally clarify the modulation mechanism of the YSCWM to the sea level variations based on theory derivation. The proposed work can serve as a baseline for the comprehensive understanding of the YS sea level variation.

黄海冷水团作为黄海最主要的水文特征之一，其存在和发展会影响黄海底部温盐分布，从而影响局地比容高度场，进而对黄海海面高度变化产生调制。但目前尚未见到公开发表的文献对此机理进行研究。本项目拟利用多源卫星遥感数据、现场观测数据和再分析数据，应用多种数据分析和处理方法，认知黄海冷水团比容高度变化特征，诊断分离高度计数据中多时间尺度海面高度变化贡献，再结合理论推导统一现场观测和卫星遥感结果，阐明黄海冷水团对黄海海域海平面高度异常的调制机理，为全面认识黄海海平面高度变化打下基础。

黄海冷水团通常出现在黄海中部海域夏秋季节，因为海水层化较强而冷水团位于混合层以下，一直以来对黄海冷水团的研究都以现场观测和数值模拟为主，尚无公开发表的文献阐述黄海冷水团对于海面高度变化的机理。本项目利用多源卫星遥感数据、现场观测数据和再分析数据，从理论出发提出并验证了黄海冷水团的海面高度变化调制机理，利用多源遥感观测数据重构海面高度变化场，并由此定义了一种新型遥感参数（CMW Index）表征黄海冷水团的空间分布特征，发展了黄海冷水团乃至水下水团的遥感研究手段，增进了黄海海域海平面高度变化的认知，对于中深层遥感的发展具有重要的科学意义。