摘要
用1951年1月至2003年12月NCEP/NCAR再分析格点比湿、垂直速度资料,以及杭州站降水量资料,分析了杭州地区对流层整层可降水量、低层空气垂直上升运动强度以及地面降水量的演变特点。结果发现,可降水量与低层空气垂直上升运动具有显著的年代际变化,且这两者均利于降水的时段,降水量不一定偏多,这说明空中水资源具有很大的开发空间。对杭州6月大气可降水量的长期变化特征与全球同纬度地区作了对比,发现近53年来,杭州地区6月份降水量处于下降趋势。
The evolutionary features of the whole tropospheric precipitable water, the intensity of vertical ascending motion in the lower layers over Hangzhou, and the surface precipitation in Hangzhou are analyzed by the NCEP/NCAR reanalysis grid data of humidity and vertical velocity, as well as the stationary data of precipitation in Hangzhou, from January 1951 to November 2003. The results show that there is significant interannual variation both in precipitable water and vertical ascending motion, and even though both precipitable water and vertical ascending motion are favorable, the precipitation would not certainly greater than normal, which means that atmospheric water resources have great potential. The long-term variation features of atmospheric precipitable water in June over Hangzhou are compared with those of other places at the same latitude over the world, and the results show that the precipitable water in the troposphere in June over Hangzhou and the other cities at the same latitude had a decreasing trend in the past 53 years.
出处
《气象科技》
2007年第1期61-65,共5页
Meteorological Science and Technology
关键词
杭州
可降水量
垂直上升运动
降水量
变化趋势
Hangzhou, precipitable water, vertical ascending motion, precipitation, variation trend
