2008年孟加拉湾春季暖池生消过程的热收支诊断分析

刘延亮; 于卫东; 李奎平; 李志; 王辉武; 高立宝

2008年孟加拉湾春季暖池生消过程的热收支诊断分析

国家海洋局第一海洋研究所, 山东青岛 266061;国家海洋局海洋与气候研究中心, 山东青岛 266061

基金项目: “印度洋季风爆发监测及社会生态影响研究与航次调查”（QY0113002）；“孟加拉湾春季暖池生消机制及其季节内和年际变化研究”（GY0213G36）；国家自然科学基金项目（41005032）；“影响我国气候变化的关键海气相互作用研究”（2008T02）；“黄东海季风海洋学研究”（GY02-2007T08）。

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- 收稿日期: 2012-02-04

Mixed layer heat budget in Bay of Bengal： Mechanism of the generation and decay of spring warm pool

First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;Center for Ocean and Climate Research, State Oceanic Administration, Qingdao 266061, China

摘要

摘要: 在夏季风爆发前孟加拉湾会出现季节性暖池，在季风爆发后它则快速消失。本文利用RAMA浮标阵列中孟加拉湾中部浮标的观测资料，通过进行混合层热收支诊断，对2008年孟加拉湾春季暖池的生消过程进行了分析。结果表明：热通量项主导了暖池的生成和消亡过程，它在暖池生成期表现为强加热效应，而在暖池消亡期变为强冷却效应；垂向卷夹的冷却作用在暖池生成阶段比较突出；温度平流项的冷却作用在冬季较强。对热通量项的进一步分析表明：短波辐射平均热效应在暖池生成期高达0.32℃/d，而在暖池消亡期降低一半，这是使热通量项在两个时期有不同表现的根本原因；潜热通量在各阶段的平均冷却效应基本保持不变，都在-0.14℃/d左右；长波辐射的冷却效应在暖池生成期比较显著，一定程度上减缓了海温的上升速度；感热通量的热效应相对较小。
- 孟加拉湾 /
- 热通量 /
- 混合层深度 /
- 暖池
Abstract: A spring warm pool appeared before the summer monsoon onset in Bay of Bengal (BOB), and disappeared rapidly after the monsoon onset. The RAMA buoy data in central BOB were used to study seasonal warm pool process by diagnosing the heat budget of mixed layer in BOB. The study showed: The Net surface heat flux dominated both generation and decay phase of the spring warm pool, which performed a strong heating effect in generation phase and a strong cooling effect in decay phase. Advection of temperature only played an important role only in winter time when the entrainment effect became strong during the warming period. Analysis on heat flux term showed: The heating effect of solar radiation was the main determining factor of the behalf of net surface heat flux, which was high to 0.32℃/d in generation phase. The cooling effect of latent heat flux was not varied much, which was about -1.4℃/d all the time. The cooling effect of long wave radiation slowed down the speed of temperature increase in generation phase. The sensible heat flux played a negligible role all the time.
- Bay of Bengal /
- heat flux /
- mixed layer depth /
- warm pool

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