应用气象学报
應用氣象學報
응용기상학보
QUARTERLY JOURNAL OF APPLIED METEOROLOGY
2009年
6期
753-760
,共8页
陈娇娜%李国平%黄文诗%刘碧全%杨东
陳嬌娜%李國平%黃文詩%劉碧全%楊東
진교나%리국평%황문시%류벽전%양동
秋雨%华西%地基GPS%水汽总量%降水
鞦雨%華西%地基GPS%水汽總量%降水
추우%화서%지기GPS%수기총량%강수
autumn rain%West China%ground-based GPS%precipitable water vapor%precipitation
利用成都地区地基GPS观测网2007年9-11月的观测数据,结合自动气象站资料计算出30 min间隔GPS遥感的大气水汽总量(GPS-PWV).将成都地区秋季降雨分为阵性降雨和连续性降雨(秋绵雨),结合其他气象要素资料,分析了GPS-PWV变化与成都秋雨之间的关系.结果表明:高值的水汽总量是产生降水的必要条件;不同的降水过程,GPS-PWV的变化幅度、极值水平和持续时间存在明显差异.水汽的增长、上升运动的增强和温度的减少是造成阵性降水的主要原因;而秋绵雨过程中,水汽的增长和地面露点温度差与降水过程有较好的对应关系.
利用成都地區地基GPS觀測網2007年9-11月的觀測數據,結閤自動氣象站資料計算齣30 min間隔GPS遙感的大氣水汽總量(GPS-PWV).將成都地區鞦季降雨分為陣性降雨和連續性降雨(鞦綿雨),結閤其他氣象要素資料,分析瞭GPS-PWV變化與成都鞦雨之間的關繫.結果錶明:高值的水汽總量是產生降水的必要條件;不同的降水過程,GPS-PWV的變化幅度、極值水平和持續時間存在明顯差異.水汽的增長、上升運動的增彊和溫度的減少是造成陣性降水的主要原因;而鞦綿雨過程中,水汽的增長和地麵露點溫度差與降水過程有較好的對應關繫.
이용성도지구지기GPS관측망2007년9-11월적관측수거,결합자동기상참자료계산출30 min간격GPS요감적대기수기총량(GPS-PWV).장성도지구추계강우분위진성강우화련속성강우(추면우),결합기타기상요소자료,분석료GPS-PWV변화여성도추우지간적관계.결과표명:고치적수기총량시산생강수적필요조건;불동적강수과정,GPS-PWV적변화폭도、겁치수평화지속시간존재명현차이.수기적증장、상승운동적증강화온도적감소시조성진성강수적주요원인;이추면우과정중,수기적증장화지면로점온도차여강수과정유교호적대응관계.
Based on the principle of deriving precipitable water vapor with ground-based GPS,the estimates of total zenith delay are calculated using ZTD data from the ground-based GPS network in Chengdu Plain during the period of September to November 2007.Precipitable water vapor (PWV) derived from GPS are obtained at 30-minute interval combining meteorological data from automatic weather stations.The autumn rain is classified as showery rain and continuous precipitation in Chengdu Plain,and the relationship between GPS-PWV and autumn rain is analyzed.It shows that precipitation always happens in high value phase of water vapor,so the high precipitable water vapor is necessary for rain in most cases.Precipitation happen when the PWV anomaly is positive,and the PWV anomaly is always higher than 1 when a rainstorm occurs.The variation range of showery in autumn is large.The GPS-PWV always increases 12 hours before the precipitation.When GPS-PWV is higher than the base value of the month or acutely increases in the adjacent time,a shower is likely to occur.High GPS-PWV level and weak updrafts just lead to small rain.But the increasing of precipitable water with strong ascending motion and the decreasing of temperature always causes shower.During continuous precipitation in autumn in Chengdu Plain,the accumulation of water vapor is very important,strong precipitation often happens when water vapor rises once again.If the precipitable water vapor maintains the high level,it may rain within 12 hours.If the water vapor falls to the base value of the month then rise to above that within 12 hours,it indicates the beginning of another phase of precipitation.GPS-PWV variation range,extremum level and duration are different in different rain process.These results may be referential for applying precipiatable production derived from ground-based GPS network in precipitation forecast.