【摘要】 以浙江沿海30个测站1982年1,4,7三个月风的自记记录为依据,对浙江沿海海陆风环流进行了研究。发现它具有明显的演变规律和重要的天气动力学特征。主要结果如下:(1)海风强,维持时间短;陆风弱、维持时间长。(2)海陆风相互转换的时间在海岸线附近最早。(3)海陆风向内陆伸展的范围一般在50公里左右;垂直伸展高度在600米左右。(4)海风(陆风)盛行时,在奉化、宁海和临海一带存在一条辐合(辐散)线,主要辐合(辐散)中心也都在这一带。它是大气边界层重要的中尺度系统。(5)海陆风造成的地面风辐合带常是浙江沿海地区大暴雨发生的地方。在作浙江沿海暴雨预报时,不可忽视海陆风环流的作用。更多还原

【Abstract】 In this paper, the autographic records of wind from 30 meteorological stations over Zhejiang coast in January, April and July 1982 are used to calculate and analyse in detail the circulation and divergence field of sea-land breeze over Zhejiang coast.By analysing the characteristic features of sea-land breeze circulation over Zhejiang coast, we find that (1) The sea breeze is stronger than the land breeze, but its maintenance time is shorter than that of the latter, (2) The transition time from the sea breeze to the land breeze and vice versa over Zhejiang coast line is earlier than that over other regions. (3) The horizontal dilatation extension of sea-land breeze toward the inland is about 50 km. and the vertical dilatation altitude is about 600 m. (4) When the sea breeze prevails, there is a convergent line along Fenghua (奉化), Ninghai (宁海) and Linhai (临海). The main convergent center is just situated on the same regions. However, during the prevailing landbreeze period, there is a divergent line along the above regions. It is the important mesoscale pressure system in the atmospheric boundary layer.By making an investigation on the contributions of the sea-land breeze to heavy rain, it is found that the convergence zone of sea-land breeze plays an important role in the formation, strengthening and maintenance of heavy rain over Zhejiang coast. Therefore, we must set great store by the effects of sea-land breeze circulation on the heavy rain.更多还原