名山站探空资料与风廓线雷达资料的对比分析

Comparative Analysis of Sounding Data and Wind Profile Radar Data at Mingshan Station

应用四川省名山站2015~2017年6月21日~7月31日每日四个时次的西南涡加密探空资料与风廓线雷达资料,对比分析了在对流层低层风探测上两种资料的差异。结果表明:名山站风廓线雷达资料有效探测高度约为4200m;风廓线雷达和探空测得的风场廓线形状总体接近,两者的风速偏差较小,仅在个别层次和时次偏差大,风速的偏差大小与风廓线风速大小存在正相关关系,除少数情况外风廓线雷达测得的风速均大于探空;两者风向差值随高度的变化规律与风速相反,在中高层较小,低层较大;除01:15时次的500m高度外,其余时次自低层到高层两者观测到的主风向均由偏东北风变为偏西南风,一致性较好;U风和V风散点分布主要沿对角线呈棒槌型,V风质量优于U风,19:15这一时次的风廓线雷达探测U风相对探空资料存在明显系统性正偏差;风廓线雷达探测高度受降水影响较大,在07:15和13:15时次有降水时其探测高度明显高于无降水时。

By using the southwest vortex dense sounding data and wind profile radar data achieved in Southwest Vortex Dense Observation Experiment at Mingshan Station in Sichuan Province from 2015 to 2017,the difference between the two data in the detection of lowlevel wind in the troposphere are compared and analyzed.The results show that the effective detection height of the wind profile radar data at Mingshan Station is about 4200m.The shape of wind profile measured by wind profile radar and sounding is generally close.The deviation of wind speed between wind profile radar and sounding is small,and the deviation is large only at individual levels and times.There is a positive correlation between the wind speed deviation and wind profile wind speed.Except for a few cases,the wind speed measured by wind profile radar is greater than that measured by sounding.The variation of wind direction difference with height is opposite to that of wind speed,which is smaller in the middle and high levels,and larger in the low level.Except for the 500m altitude layer in the early morning,the main wind direction observed from the lower level to the upper level changed from the northeast wind to the southwest wind with good consistency.The distribution of U-wind and V-wind scattered points mainly presents a hammer-shaped distribution along the diagonal,and the quality of V-wind is better than that of U-wind.The U-wind detected by wind profile radar has obvious systematic positive deviation relative to the sounding data in the night period.Precipitation has a great influence on wind profile radar detection height,when there is precipitation in the morning and at noon,the detection height is significantly higher than that without precipitation.