青藏高原冬季积雪与华南前汛期降水年际变率的联系
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1.①南宁师范大学地理科学与规划学院;2.②广西壮族自治区气象科学研究所;3北海国家气候观象台开放实验室;4.1广西壮族自治区气象科学研究所;5.2北海国家气候观象台开放实验室;6.③广西壮族自治区气候中心

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国家自然科学基金(41905077)和广西重点研发计划(桂科AB21196041,桂科AB22035016,桂科AB21075005)


Connections between winter snow depth over the Tibetan Plateau and the interannual variation of precipitation during the first rainy season in South China
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1School of Geography and Planning, Nanning Normal University, Nanning 530001, China 2Guangxi Institute of Meteorological Sciences, Nanning 530022, China 3Laboratory of Beihai National Climate Observatory, Nanning 530022, China;2.1Guangxi Institute of Meteorological Sciences, Nanning 530022, China 2Laboratory of Beihai National Climate Observatory, Nanning 530022, China;3.广西南宁市民族大道81号

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    摘要:

    利用1979–2018年青藏高原(高原)卫星积雪、华南地区261站逐日降水及ERA5再分析资料,探讨了高原冬季积雪与华南前汛期降水的联系。结果表明:1)高原西部积雪与华南前汛期降水的正相关关系最为稳定,其主要影响前汛期的锋面降水,对夏季风降水的影响较小;2)华南前汛期在高原西部积雪偏多年比偏少年偏早20天,使得前汛期降雨日数偏多,持续时间偏长,总降水量偏多,而降水强度受积雪的影响较小;3)高原积雪偏多年,积雪的冷却作用形成了低层异常反气旋环流,而东亚沿岸为“+-+”的位势高度异常,中纬度“西高东低”的环流配置有利于中高纬冷空气南侵,使得华南上空温度偏低,同时偏强偏南的西太平洋副热带高压加强了低纬地区偏南气流和水汽输送。3-4月锋面在华南北部南北摆动,四月初偏北干冷空气南侵和偏南暖湿气流的持续北推使得锋面加强,触发了前汛期的较早建立;积雪偏少年冷空气和偏南暖湿气流均较弱,华南北部锋面在四月初中断,四月中下旬华南北部锋面在偏北弱冷空气和偏南暖湿气流的共同作用下重新建立,从而华南前汛期开始偏晚。

    Abstract:

    Based on the satellite derived snow depth over the Tibetan Plateau (TP), daily rainfall data of 261 meteorological stations in South China (SC) and the ERA5 reanalysis dataset during 1979-2018, relationships between the TP winter snow depth and precipitation during the first rainy season (FRS) in SC have been investigated. Results show that: (1) Connections between snow depth over the western TP and precipitation during the FRS in SC are the most robust and the TP snow depth mainly affects frontal precipitation of the FSR, whereas it shows less impact on summer monsoonal rainfall. (2) Onset date of the FRS in above normal TP snow years is about 20 days earlier than that in below normal snow years, leading to more rainy days, longer of the FRS and more rainfall during the FRS. However, rainfall intensity during the FRS shows small difference between different types of the TP snow years. (3) The TP is colder in above normal snow year and the cooling effect stimulates an abnormal anticyclonic circulation over the TP. However, tripole anomaly patterns of 500 hPa geopotential height occur at East Asian coastal region. Configurations of the circulation facilitate cold air in middle-high latitude regions invade SC, which makes a colder SC. And the enhanced northwest Pacific subtropical high intensifies the low-level southerly flow and water vapor supplement. The front swings northward-southward in northern part of the SC during March-April. The FRS has been established once the dry cold northerly and the warm-wet southerly flow invade the SC in early April. In below normal TP snow years, both the cold northerly and warm southerly flow are weak and inactivity and the front in northern part of the SC is interrupted in early April. When the northerly and southerly flow invades the SC in mid-to-late April, the front is reverted and the FRS occurs later.

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  • 收稿日期:2022-05-03
  • 最后修改日期:2022-06-25
  • 录用日期:2022-07-07
  • 在线发布日期: 2022-07-07
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