宁波地区海风环流的数值模拟分析

Numerical Simulation Analysis of a Sea Breeze Circulation in Ningbo

利用1km分辨率的WRF模式对2010年8月24日至8月26日宁波地区的海风环流进行了数值模拟分析,根据模拟结果,分析了宁波地区海风环流各要素等变化特征,通过风场特征讨论了海风环流的时空演变特征。结果表明:WRF模式能较好地模拟海风环流各个气象要素的变化特征;海风环流发生时间为中午12:00左右,发展最强盛时期在下午16:00,海风在底层最先发展、在底层最先消失;陆风、海风最大值出现时间分别对应在温度的日最低值和日最高值后,而陆风转海风则出现在全天气压变化的第一次峰值后;风速随着高度增高而减小,在陆风时段风速明显偏小,在海风时段风速明显偏大;在有利的天气尺度背景下,海风环流的发生、发展能够进一步加强。

Using 1km resolution WRF model, the sea breeze circulation numerical simulation in Ningbo on 24 to 26 August 2010 was simulated and analyzed, according to the simulation results, tile characteristics of each element in Ningbo sea breeze circulation was analyzed, temporal and spatial variations discussed by the wind field characteris- tics of the sea breeze circulation .The results showed as follows： during this sea breeze circulation, WRF model suc- cessfully simulated the characteristics of each element. Period of sea breeze circulation occurred in around 12：00, the development of tile most powerful and prosperous period in the afternoon 16：00, sea breeze appeared and disappeared firstly in the lower level. Land breeze,sea breeze maximum time correspond to the value of daily minimum and daily maximum value at a temperature, but tile land breeze turned sea breeze after tile first peak of the all-day changes in air pressure. The wind force decreased with height, in the land breeze time, the wind significantly smaller, and in the sea breeze time, the wind significantly larger. In a favorable weather scale background, the occurrence and develop- ment of the sea breeze circulation could further strengthen.