| 孟加拉湾夏季季节内振荡的湿静力能分析 |
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| 引用本文： | 李奎平,王海员,杨洋,于卫东,李俐俐.孟加拉湾夏季季节内振荡的湿静力能分析[J].海洋科学进展,2020,38(1):51-59. |
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| 作者姓名： | 李奎平 王海员 杨洋 于卫东 李俐俐 |
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| 作者单位： | 自然资源部第一海洋研究所,山东青岛266061;青岛海洋科学与技术试点国家实验室区域海洋动力学与数值模拟功能实验室,山东青岛266237,中山大学大气科学学院,广东珠海,519082 |
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| 基金项目： | 全球变化与海气相互作用专项——太平洋-印度洋与亚洲季风的相互影响;国家重点研发计划项目——10～30天极端天气过程可预报性及预报理论与方法研究;中央级公益性科研院所基本科研业务费专项资金资助项目——印度洋年际异常对孟加拉湾夏季风爆发的影响;束星北青年学者项目-全球变暖背景下印度洋海气相互作用与季节内振荡的联系 |
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| 摘 要： | 夏季期间大气季节内振荡(ISO)活跃于孟加拉湾区域,并存在显著的向北传播。采用1979-2016年ERA-Interim大气再分析资料,通过对典型ISO事件进行位相合成,揭示了夏季期间孟加拉湾湿静力能季节内变化的演变特征和控制机理。结果表明,ISO大气对流在向北传播期间伴随着显著的湿静力能累积(充电)和释放(放电)过程。其中,水汽主导的湿静力能水平平流是充电和放电的关键控制因素。水汽水平平流在对流层中高层和对流层低层的变异机理存在一定差异,在中高层主要取决于ISO扰动纬向风对低频水汽的纬向输送,在低层则主要取决于低频经向风对ISO扰动水汽的经向输送。
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| 关 键 词： | 孟加拉湾 季节内振荡 湿静力能 |
Budget Analysis of Moist Static Energy in Summertime Intra-seasonal Oscillations Over the Bay of Bengal |
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| LI Kui-ping,WANG Hai-yuan,YANG Yang,YU Wei-dong,LI Li-li.Budget Analysis of Moist Static Energy in Summertime Intra-seasonal Oscillations Over the Bay of Bengal[J].Advances in Marine Science,2020,38(1):51-59. |
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| Authors: | LI Kui-ping WANG Hai-yuan YANG Yang YU Wei-dong LI Li-li |
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| Institution: | (First Institute of Oceanography,MNR,Qingdao 266061,China;Laboratory for Regional Oceanography and Numerical Modeling,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266237,China;School of Atmospheric Science,Sun Yat-sen University,Zhuhai 519082,China) |
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| Abstract: | The northward-propagating intra-seasonal oscillations(ISOs) activate in the Bay of Bengal(BoB) during boreal summer. In this study, the intra-seasonal evolutions and controlling mechanisms of moist static energy(MSE) in the BoB are diagnosed based on ERA-Interim reanalysis data in 1979-2016. The ISO phase-dependent composite indicates that strong MSE recharge and discharge occurs during the ISO northward propagation in the BoB. A budget analysis of MSE further reveals that the recharge and discharge are primarily controlled by the moisture term associated with horizontal advection. In addition, it is noted that different physical processes dominate the horizontal moisture advection between the mid-upper and the lower troposphere. At mid-upper level, the horizontal moisture advection mainly depends on the transport of low-frequency moisture by intra-seasonal zonal wind. While at lower level, the horizontal moisture advection is mainly due to the transport of intra-seasonal moisture by low-frequency meridional wind. |
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| Keywords: | the Bay of Bengal intra-seasonal oscillation moist static energy |
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