| 不同PDO背景下华南前汛期锋面和季风降水的水汽输送差异 |
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| 引用本文： | 李俊杰,范伶俐,梁梅,徐建军.不同PDO背景下华南前汛期锋面和季风降水的水汽输送差异[J].大气科学学报,2022,45(4):539-551. |
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| 作者姓名： | 李俊杰 范伶俐 梁梅 徐建军 |
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| 作者单位： | 广东海洋大学 海洋与气象学院, 广东 湛江 524088;广东海洋大学 海洋与气象学院, 广东 湛江 524088;广东海洋大学 陆架及深远海气候、资源与环境广东省高等学校重点实验室, 广东 湛江 524088;中国气象局-广东海洋大学海洋气象联合实验室, 广东 湛江 524088 |
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| 基金项目： | 国家重点研发计划项目(2018YFC1506002);CYL2020高水平大学重点学科-海洋科学(231420003);广东省普通高校创新团队项目(2019KCXTF021);广东海洋大学大学生省级创新实验项目(CXXL2020048) |
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| 摘 要： | 基于华南地区60个站点的逐日降水资料及NCEP再分析资料,采用拉格朗日后向气流轨迹模式(HYSPLIT_4.9),分析了1960—2012年PDO (Pacific Decadal Oscillation,太平洋年代际振荡)不同相位期间,华南前汛期锋面和季风降水的水汽输送轨迹、主要源地及不同源地水汽的降水贡献率的差异。结果表明:1)锋面降水阶段,在PDO正相位期间,西太平洋-中国南海-孟加拉湾水汽较多;夏季风降水阶段,在PDO正位相期间,北印度洋-孟加拉湾-中国南海的整层水汽含量较多。2)锋面降水阶段,水汽主要来自西北太平洋与中国南海,在PDO正相位期间,副热带高压位置偏北,使得西太平洋水汽输送路径偏北,有更多水汽向华南输送,有利于华南季风降水形成,降水与PDO呈显著的正相关关系。3)季风降水阶段,在PDO正位相期间,尽管北印度洋-孟加拉湾-中国南海的整层水汽含量大,但并未都输送至华南,故形成的有效季风降水偏少,降水与PDO呈显著的负相关关系。
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| 关 键 词： | 华南前汛期 拉格朗日轨迹模式 太平洋年代际振荡 降水异常 水汽输送 |
| 收稿时间： | 2021/6/24 0:00:00 |
| 修稿时间： | 2021/10/10 0:00:00 |
Water vapor transport differences of frontal and monsoon precipitation during South China pre-flood season under different PDO phases |
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| LI Junjie,FAN Lingli,LIANG Mei,XU Jianjun.Water vapor transport differences of frontal and monsoon precipitation during South China pre-flood season under different PDO phases[J].大气科学学报,2022,45(4):539-551. |
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| Authors: | LI Junjie FAN Lingli LIANG Mei XU Jianjun |
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| Institution: | College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China;College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China;Key Laboratory of Climate, Resources and Environment in Continental Shelf Sea and Deep Sea of Department of Education of Guangdong Province, Guangdong Ocean University, Zhanjiang 524088, China;CMA-GDOU Joint Laboratory for Marine Meteorology, Zhanjiang 524088, China |
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| Abstract: | Based on the daily precipitation data of 60 stations in South China and NCEP reanalysis data,the Hybrid Single-Particle Lagrangian Integrated Trajectory model (HYSPLIT_4.9) are used to analyze the difference of water vapor transport trajectories of frontal and monsoon precipitation in the pre-flood season in South China,main water vapor sources and precipitation contribution rates of water vapor in main sources during different Pacific Decadal Oscillation (PDO) phases from 1960 to 2012.Results show that:(1)In the frontal precipitation stage,there is more water vapor in the Western Pacific-the South China Sea-the Bay of Bengal during the positive PDO phase.In the summer monsoon precipitation stage,the water vapor in the northern Indian Ocean-the Bay of Bengal-the South China Sea is more during the positive PDO phase.(2)In the frontal precipitation stage,the water vapor mainly comes from the Northwest Pacific and the South China Sea.During the positive PDO phase,the subtropical high is located to the north,which makes the water vapor transport path in the Western Pacific to the north and transports more water vapor to South China.It is conducive to the formation of monsoon precipitation in South China.There is a significant positive correlation between precipitation and PDO.(3)In the monsoon precipitation stage,during the positive PDO phase,although the water vapor content in the whole layer from the northern Indian Ocean-the Bay of Bengal-the South China Sea is large,it is not completely transported to South China,so the effective monsoon precipitation is less,and there is a significant negative correlation between precipitation and PDO. |
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| Keywords: | South China pre-flood season Lagrangian trajectory model Pacific Decadal Oscillation precipitation anomaly water vapor transport |
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