海岛降水的数值模拟研究OA
Numerical simulation of precipitation over tropic island
基于理想化辐射对流平衡模型,开展准二维对流允许数值试验,研究了岛屿降水时空分布特征,分析纬度、地形、大小等因素对岛屿降水的影响.数值试验结果表明,海岛日平均降水随着纬度的增加而逐渐减少,海岛降水日变化显著,降水峰值集中在午后-傍晚时间,随着纬度的降低,降水峰值时间推后,高纬度海岛的降水峰值出现在午后(14时左右),低纬度海岛的降水峰值出现在傍晚(21时左右),其原因可部分归结于不同纬度的海陆风的差异.海岛地形高度的增加有助于增强降水,地形强迫有利于海岛中心垂直上升运动的发展,但降水和地形高度之间的关系是非线性的.岛屿面积的有限增大不能改变岛上环流结构,岛上总对流降水有所增加,但降水更加分散,显著降低了日平均降水.
Quasi-two-dimensional convection-permitting simulations under an idealized radiative-convective equilibrium framework are used to examine how latitude,topography,and island size shape the spatiotemporal characteristics of tropical island precipitation.Daily mean precipitation decreases with increasing latitude,and a pronounced diurnal cycle appears,with rainfall peaking from afternoon to evening.The peak occurs earlier at higher latitudes(～14:00 LT)and shifts to the evening at lower latitudes(～21:00 LT),partly due to latitude-dependent variations in sea-land breeze circulations.Increasing topographic height enhances precipitation by strengthening vertical upwelling over the island's interior.Enlarging island size does not alter the overall circulation structure,but leads to more spatially dispersed rainfall,reducing the island-mean daily precipitation despite an increase in total convective precipitation.
余潜;汪曙光
灾害天气科学与技术全国重点实验室,中尺度灾害性天气教育部重点实验室,南京大学大气科学学院,南京,210023灾害天气科学与技术全国重点实验室,中尺度灾害性天气教育部重点实验室,南京大学大气科学学院,南京,210023
天文与地球科学
海岛降水数值模拟纬度地形作用岛屿大小
island precipitationnumerical simulationlatitudetopographyisland size
《南京大学学报（自然科学版）》 2026 (3)
347-356,10
国家重点研发计划(2023YFC3008003)
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