GPS遥感大气可降水量在降水天气过程分析中的应用

应用GPS探测的大气可降水量(PWV)对2010年大连地区降水过程中水汽变化特征进行了分析。结果表明：GPS/PWV资料能反映大气中水汽的时间和空间变化，其变化特征与降水有较好的对应关系；不同性质的降水过程PWV变化特征明显不同，稳定性降水过程中PWV变化较为平缓，呈明显的单峰结构，对流性降水过程水汽变化程度剧烈，呈震荡趋势，而混合型降水具有两种性质降水的共同特征；降水过程中GPS/PWV阈值表明，GPS/PWV资料在降水天气预报方面有一定的应用价值。

Application of precipitable water vapor from ground based GPS data to analysis of precipitation weather process

Based on the perceptible water vapor（PWV） data from the ground based GPS, the water vapor character- istics of precipitation weather processes in Dalian in 2010 were analyzed. The results show that the PWV data could reflect the temporal and spatial variation of water vapor and its variation characteristics has a significant corre- sponding relationship with precipitation. If the precipitation process differs, the PWV characteristics are also dis- tinctly different. The PWV variation is gentle for a stable precipitation type and it has a single peak value;water vapor changes violently for a convective precipitation type and it is in a fluctuating trend ;it is of the common char- acteristics of the above two precipitation types for a mixed precipitation type. The thresholds of the PWV related to rain are also given in We text,which indicates that the PWV data are useful to forecast precipitation to some extent.