摘要
对伊犁河谷地区初冬降水条件下风廓线雷达资料评估其数据获取率并与探空资料进行对比分析,定义两者风向偏差在10°以内或风速偏差在1 m/s范围的样本为有效样本,分别用E_v和E_d表示风速有效样本比率(风速有效样本数/总样本数)和风向有效样本比率(风向有效样本数/总样本数)。结果显示:超过80%数据获取率的高度,降雨时为3000 m,降雪时达到预设2000 m;降雪时E_v和E_d均比无降水时高,且降雪量大小与风廓线的探测高度呈正相关,降雪量大小对E_d有明显影响,对E_v无明显影响;比较不同高度数据,降雪时0~3 km范围的E_v和E_d值均比无降水时高30%左右,无降水时3~5 km范围的E_d接近100%。
The data acquisition rate of the wind profile radar data under the early winter precipitation conditions in the Ili River valley area is evaluated and compared with the radiosonde data. When the deviation of direction or velocity of the wind sample is not greater than 10 degrees or 1 m/s respectively, it is defined as an effective sample. The effective sample ratio of direction and velocity is indicated by Ed (number of effective sample of direction / total number of sample) and Ev (number of effective sample of velocity / total number of sample) respectively. The results show that: The height of the data acquisition rate exceeding 80% is 3000 m when rainfall, and 2000 m when snowfall. Ev and Ed are higher than when there is no precipitation during snowfall, and the snowfall is positively detected with the wind profile. Correlation, the amount of snowfall has a significant impact on Ed and has no obvious effect on Ev. Comparing different height data, the Ev and Ed values in the range of 0~3 km during snowfall are about 30% higher than those without precipitation, and the Ed in the range of 3~5 km without precipitation is close to 100%.
作者
刘凡
杨莲梅
LIU Fan;YANG Lianmei(Institute of Desert and Meteorology, China Meteorological Administration, Urumqi 830002, China;Center for Central Asia Atmosphere Science Research, Urumqi 830002, China)
出处
《沙漠与绿洲气象》
2019年第5期34-40,共7页
Desert and Oasis Meteorology
基金
中亚大气科学研究基金(CAAS201916)
中央级公益性科研院所基本科研业务费(IDM201920)
国家重点研发计划(2018YFC1507102)
关键词
风廓线雷达
数据获取率
探空资料
评估
wind profile radar
data availability
radiosonde data
evaluation
