区域气候变化背景下南海叶绿素浓度时空变异特征及其成因研究

南海叶绿素浓度在海洋热力和动力过程作用下表现出复杂的多时空尺度变化特征，深入分析其时空变化规律并揭示海洋热力、动力过程对叶绿素浓度时空变异的影响，对于认识全球气候变化、区域海洋响应及海洋生态环境演变具有借鉴意义。.本项目拟以多源卫星遥感资料和历史常规观测资料分析为主，辅以海上现场观测和数值模拟等手段，研究不同类型ENSO（东部型和中部型）、正负IOD模态以及ENSO与IOD联合模态影响下，南海区域大气和海洋环境场的变化特征，尤其是海洋的热力与动力过程变化特征，探讨叶绿素浓度水平和垂向结构的多时间尺度变异特征及其形成机制，并重点从季节内、季节以及年际等不同时间尺度揭示南海叶绿素浓度对区域气候变化的响应特征和机制，以进一步提升对气候变化背景下南海生态环境演变规律的认识水平。

The regional thermal and dynamic processes contribute a lot to the evolution of chlorophyll-a (Chl-a) concentration in the South China Sea (SCS). It is of great importance to investigate the temporal and spatial variations of Chl-a concentration under climate change. Moreover, an in-depth analysis of the impact of ocean thermal and dynamic processes on the Chl-a variations will in turn facilitate studies in the global climate variability and ocean ecological environment evolution。.??Based on the multi-source satellite remote sensing data historical observations, and the in-site observations, this study proposes to combine the usage of statistical analysis and numerical modeling to examine the variations of Chl-a concentration in the SCS influenced by three perspectives: 1) pure El Ni?o-Southern Oscillation (ENSO) with different types (including the eastern Pacific El Ni?o and the central Pacific El Ni?o), 2) pure Indian Ocean Dipole (IOD, including the positive and negative IOD Modes) and 3) co-occurring ENSO and IOD events. The present research will investigate both the horizontal and vertical structures of Chl-a concentration and their variations driven by the regional thermal and dynamic processes. The responses of Chl-a concentration and physical environmental parameters to climate change will also be explored in this research at multiple time-scales from intraseasonal to interannual. The proposed research will thus be devoted to provide research foundations to the ecological environment evolution and forecasting of the SCS under climate change.