2011年10月大气环流和天气分析

摘要

2011年10月大气环流主要特征如下：极涡呈偶极型分布,中心分别位于格陵兰岛北部和亚洲北部,位于格陵兰岛的中心比常年略偏强。中高纬度地区环流呈现4波型分布,大西洋中部和太平洋东部大槽的强度略偏强,东欧槽和东亚槽比常年偏弱。南支槽大约位于90。E附近略偏西,与多年平均位置一致,强度略偏强。副热带高压强度接近常年同期。2011年10月全国平均气温为10.6℃,较常年偏高1.0℃。全国平均降水量为38.7 mm,较常年同期偏多1.7 mm。月内出现4次较强降水过程、2次较强冷空气过程和3次大雾天气过程。%The following are the main characteristics of the general circulation of atmosphere in October 2011.There were two polar vortex centers in the Northern Hemisphere.The circulation presents a fourwave pattern in middle-high latitudes.The intensity of the center of Atlantic and the east of Pacific deep trough is stronger than that of troughs in average conditions.The average temperature（10.6℃） is 1.0℃higher than and the average precipitation（38.7 mm） is 1.7 mm more than compared the same time of normal years during October in 2011.There were four precipitation processes,two cold air processes and three heavy fog processes in the month.