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CN 11-1768/O4

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夏季青藏高原及周边上对流层水汽质量及其向平流层传输年际异常Ⅰ:水汽质量异常主导型
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1.南京信息工程大学气象灾害预报预警与评估协同创新中心;2.中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验;3.中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室;4.中国科学院大学;5.南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心

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基金项目:

中国科学院战略性先导科技专项(A类)项目XDA17010105,国家自然科学基金项目91437105、41575041、91837311,中国科学院前沿科学重点研究项目QYZDY-SSW-DQC018


Interannual variations of the upper tropospheric water vapor and its transport into the stratosphere over the Ti-betan Plateau area in summer, Part Ⅰ: on the leading pat-terns of water vapor mass anomalies
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Affiliation:

1.State Key Laboratory of Numerical Modeling of Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences;2.University of Chinese Academy of Sciences;3.Key Laboratory of Meteorological Disaster, Ministry of Education (KLME)/ Joint International Research Laboratory of Climate and Environment Change (ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Metrological Disasters (CIC-FEMD), Nanjing University of Infor-mation Science &Technology

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    摘要:

    本文利用逐年7~8月平均的ERA-Interim再分析资料并结合SWOOSH水汽数据,分析了青藏高原及周边地区330~360 K层次水汽质量分布的年际异常特征及其成因。结果表明,水汽质量分布异常表现为整体异常型、东西偶极异常型和南北偶极异常型三个主导分布型。整体异常型在水汽质量整体偏多时,青藏高原地区对流和垂直向上的水汽质量非绝热传输偏强,上对流层为异常偏强的水汽质量非绝热辐合;此时对应南亚高压偏强,青藏高原地区上对流层的水汽质量绝热辐散和高原以西地区的水汽质量绝热辐合都异常偏强,水汽质量整体偏少时则相反。东西偶极异常型水汽质量呈西多/东少分布时,青藏高原西部(中东部)对流和垂直向上的水汽质量非绝热传输异常偏强(弱),上对流层的水汽质量非绝热辐合也异常偏强(偏弱);同时对应南亚高压偏西,青藏高原西部到伊朗高原对流层上层,存在异常偏强的由东向西的水汽质量绝热输送造成的水汽质量辐合,而青藏高原中东部的上对流层为异常偏弱的水汽质量绝热辐散。水汽质量呈西少/东多分布时则有相反的结果。南北偶极异常型水汽质量呈北多/南少分布时,对?应南亚高压偏北,青藏高原北部的上对流层存在自南向北的水汽质量绝热输送所造成的水汽质量辐合,同时该地区低层异常偏强的自下向上的水汽质量非绝热输送也加强水汽质量辐合,而青藏高原南侧上对流层则为异常偏弱的水汽质量绝热辐散和水汽质量非绝热辐合,水汽质量呈北少/南多分布时相反。

    Abstract:

    Monthly averaged ERA-Interim reanalysis datasets and SWOOSH water vapor data are used to analyze the interannually geographic pattern of the water vapor mass anomaly in 340–360K lay-ers and its maintenance over the Tibetan Plateau (TP) region in July–August. Results show that the interannual variations of the geographic patterns of the water vapor mass anomaly are domi-nated by three leading modes, namely the uniform mode, the east-west dipole abnormal mode and the south-north dipole mode. Associated with the positive phase of the uniform mode, namely more (less) water vapor mass over the entire TP area, the stronger convective and upward dia-batic water vapor mass transport over the TP regions leads to an enhanced convergence of water vapor mass, while the strengthened South Asian High (SAH) results in an enhanced divergence and convergence of adiabatic water vapor mass transport over the TP and to the west of TP, and vice versa for the less water vapor mass over the entire TP area. For the positive phase of the east-west diploe mode when the water vapor mass is more/less in the west/east of TP area, both the convective and the diabatic water vapor mass transport are enhanced over the western TP but weakened over the central and eastern TP. Meanwhile, the center of SAH shifts westward giving rise to a stronger westward adiabatic water vapor mass transport from the TP to the Iranian Plat-eau in the upper troposphere. Such diabatic and adiabatic processes cooperatively contribute to the abnormal convergence of water vapor mass over the western TP, but divergence in the central and eastern TP in the upper troposphere. When the water vapor mass is less/more in the west/east of TP area, the results are also opposite. For the positive phase of the south-north dipole mode when water vapor mass is more/less in the northern/ southern TP, the center of SAH shifts north-ward giving rise to a stronger northward adiabatic water vapor mass transport in the northern TP in the upper troposphere and a stronger upward diabatic water vapor mass transport also in lower layers are found, which both leading to the abnormal convergence of water vapor mass. While the divergence of adiabatic water vapor mass transport and the convergence of diabatic water vapor mass transport are weakened in the southern TP, vice versa when water vapor mass is less/more in the northern/ southern TP.

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  • 收稿日期:2018-12-12
  • 最后修改日期:2019-03-19
  • 录用日期:2019-05-07
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