班达海水体充放过程及其对印尼贯穿流的调制机理研究

The Indonesian Throughflow (ITF) is one important part of the Great Ocean Conveyor Belt, and is also the significant channel of water and thermohaline exchange between the tropical Pacific and Indian Ocean. It plays an important role in the oceanic heat and freshwater budgets and in the climate system. Over 3/4 of the ITF water mass flow into the Banda Sea before its export into the Indian Ocean. The Banda Sea does not simply provide a passive conduit for ITF, it plays a “capacitor” role with recharge-discharge of the water mass in the Banda Sea. By analyzing in-situ observation data, we found that the recharge-discharge of the water mass of the Banda Sea can effect on the variation of ITF. But the recharge-discharge process and effect mechanism are obscure. Based on the observation data and satellite data, the numerical model, passive tracer method, adjoint model and theoretical analysis will be applied in this study on revealing the recharge-discharge of water mass of the Banda Sea and its effect on the variation of the ITF. Our study will improve the understanding of the role of the Banda Sea in the Indian-Pacific inter-ocean heat and freshwater budgets. This research can provide some scientific basis for revealing the mechanism of intraseasonal to interannual variations for ITF.

印尼贯穿流（ITF）是全球热盐环流的重要环节之一，是热带太平洋与印度洋进行水体和热盐交换的重要通道，对全球环流、物质交换及气候变化有重要影响。班达海承载着超过3/4的ITF流量，ITF水体进入班达海后，主要通过翁拜海峡和帝汶通道进入印度洋，在此过程中班达海不仅仅是ITF“通道”，而是起到更为重要的具水体质量、热量和淡水充放功能的“容器”作用，分析显示发生在其内部的水体充放对ITF具有重要的调制作用，但具体的水体充放过程及其对ITF的调制机理尚不清楚。本项目拟基于现场观测资料、卫星遥感资料和补充调查资料，结合数值模拟、水团示踪、伴随模拟和理论分析等手段，研究给出班达海水体充放过程及变化规律，揭示班达海水体充放对印尼贯穿流的调制作用及机理。通过本项目研究，能够阐释班达海在太平洋-印度洋物质和能量交换过程中的纽带性作用，对深入揭示印尼贯穿流的季节内至年际变化机理提供科学参考。

班达海承载着超过3/4的ITF流量，ITF水体进入班达海后，主要通过翁拜海峡和帝汶通道进入印度洋，在此过程中班达海不仅仅是ITF“通道”，而是起到更为重要的具水体质量、热量和淡水充放功能的“容器”作用。本项目基于HYCOM模式结果开展了班达海环流水体充放的特征规律研究，分析了班达海环流的垂直结构；基于一个四层半的准地转模型来研究了班达海环流结构和水体充放过程，量化了ITF分支、上升流和季风对班达海环流的贡献；基于现场观测资料分析了班达海上游的卡里马塔海峡和龙目海峡、下游的翁拜海峡和帝汶通道的流量特征，分析了印尼贯穿流源区（北赤道流分叉点附近海域）的多尺度变化；基于卫星测高资料、再分析资料和现场观测资料评估了印尼贯穿流出流海域海洋动力环境状况及其多尺度变化特征。项目研究成果共发表期刊论文4篇，其中SCI收录3篇。