【摘要】 2008年6月中上旬,广西出现了大范围持续性暴雨或特大暴雨天气,持续性强降雨使得广西6月降雨量显著偏多。对比分析了2008年6月和广西多雨年同期500hPa高度场和距平场,及主导环流型和V分量特征,结果表明:(1)2008年6月和广西多雨年同期6月亚欧中高纬同为两脊一槽型,青藏高原西侧和亚洲东岸均为持续稳定的高压脊,贝加尔湖及其以北为持续稳定的低压槽,青藏高原东部和孟加拉湾附近低压槽活动频繁;西太平洋副热带高压在华东、华南沿海一带持续稳定;(2)广西及附近区域500hPa环流W型和SLP环流C型与广西6月降雨量存在显著的正相关关系,2008年6月主要为这2种环流型控制;(3)当在垂直3层高度上广西东南部维持一条深厚的偏南风区域带、西北部维持一条深厚的偏北风区域带,且在广东中东部附近海面和中南半岛附近南风分量偏强,青藏高原东部北风分量偏强或为弱南风分量时,则广西6月降雨量明显偏多,2008年6月垂直3层高度上V分量符合广西6月多雨年的特征。更多还原

【Abstract】 Early June in 2008,persistent heavy rain or severe heavy rain appeared in most of Guangxi,persistent torrential rain resulted in more precipitation in June.The 500hPa circulation in the same period of wet weather in Guangxi,the correlations among circulations,V component and the precipitation in June were analyzed.Results show that(1) the pattern of mid and high latitudes was two ridges with one trough in Asia;there were stable high ridges over westside of the Tibetan Plateau and the east Asia;and there were troughs over the Lake Baikal and the North of Lake Baikal;from east Tibetan Plateau and the Bay of Bengal the trough was active;the subtropical high was still stable over the coastal area of South China or East China;(2) The correlations were positive between the W-type of 500hPa circulation,the C-type of SLP circulation and the precipitation in June,and these were the main control systems causing extremely rainy days of Guangxi in June 2008;(3) From the low layer to the high layer there maintained a deep south wind in the southeast region of Guangxi and a deep north wind in the northwest region of Guangxi,meanwhile,there was strong south wind near the coastal of eastern Guangdong and the Central South Peninsula.Over eastern Tibetan Plateau there was strong north wind or weak south wind,so that the precipitation was larger than normal in June.In June 2008,the V component was in line with the characteristics of extremely rainy days of Guangxi.更多还原