首页|8月高原季风对成都降水的影响研究

8月高原季风对成都降水的影响研究

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选取高时空分辨率的融合降水资料和ERA5再分析资料,研究8月高原季风影响成都降水的规律及物理机制.结果表明:成都 8月降水量呈西高东低的分布特征;4个 8月高原季风指数与同期成都降水均呈负相关,说明 8月高原季风增强(减弱),对应同期成都降水减少(增多);两者的负相关性在 8月中旬最强,表明这一时段高原季风对成都降水的影响最为显著;高原季风指数TPMI强年,西太副高偏南,孟加拉湾槽偏东较强,500 hPa距平场呈"+-"为主的经向分布,高原低压加强,四川东部上空受偏北气流影响,成都地区受下沉运动控制并且整层水汽辐散,对流稳定,不利于产生降水;TPMI弱年,西太副高偏北,孟加拉湾槽偏西较弱,500 hPa距平场呈"-+"为主的纬向分布,高原低压减弱,四川东部受偏南气流影响,有明显的水汽辐合且以上升运动为主,对流不稳定,利于产生降水.
Study on the Influence of Plateau Monsoon on Precipitation in Chengdu in August
Based on the fusion of precipitation data and ERA-5 reanalysis data,the law and physical mechanism of plateau monsoon affecting precipitation in Chengdu in August are studied.The results show that the precipitation in Chengdu in August is characterized by high in the west and low in the east.The four plateau monsoon indexes in Augusts are negatively correlated with the precipitation in Chengdu during the same period,indicating that the plateau monsoon increases(decreases)in August and the precipitation in Chengdu de-creases(increases).The negative correlation is the strongest in mid-August,indicating that the plateau monsoon has the most significant impact on precipitation in Chengdu during this period.In the strong TPMI years,the Western Pacific Subtropical High is southerly,the Bay of Bengal trough is stronger easterly,the 500 hPa anomaly field is mainly distributed in the meridional direction of"+-",the plat-eau low pressure is strengthened,and the east of Sichuan is affected by the northerly airflow.The Chengdu area is controlled by the sink-ing motion and the whole layer of water vapor divergence,the convection is stable,which is not conducive to precipitation.In weak years,the Western Pacific Subtropical High is to the north,the trough over the Bay of Bengal is to the west,the 500 hPa anomaly field is mainly zonal distribution of"-+",the plateau low pressure is weakened,the eastern part of Sichuan is affected by the southerly airflow,there is obvious water vapor convergence and upward movement,the convection is not stable,which is conducive to produce precipitation.

Plateau monsoonPrecipitation in ChengduCorrelationInfluence mechanism

吴尧、肖天贵、假拉

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安徽省蚌埠市气象局,蚌埠 233000

成都信息工程大学,成都 610225

成都信息工程大学云南自然灾害防御技术研发中心,昆明 650034

西藏自治区气象台,拉萨 850000

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高原季风 成都降水 相关关系 影响机制

青藏高原综合科学考察研究项目(第二次)云南省重点研发计划云南省重点研发计划国家自然科学基金集成项目中国气象局创新发展专项世界大学生运动会成都市赛事强天气短临预报系统项目(第三十一届)

2019QZKK010408202203AC10005202203AC1000691937301CXFZ2021Z0102020H467

2024

10.3969/j.issn.1674-2184.2024.02.017

高原山地气象研究
中国气象局成都高原气象研究所 中国气象学会高原气象学委员会

高原山地气象研究

CSTPCD
影响因子：1.313
ISSN：1674-2184
年,卷(期)：2024.44(2)