柴达木盆地GPS大气可降水量精度检验及其变化特征

干旱气象 ›› 2020, Vol. 38 ›› Issue (1): 50-57.

柴达木盆地GPS大气可降水量精度检验及其变化特征

韩辉邦1,2，张小军1，张博越1，田建兵1，康晓燕1

（1.青海省人工影响天气办公室，青海西宁810001；2.青海省防灾减灾重点实验室，青海西宁810001）

出版日期:2020-02-29 发布日期:2020-03-13
作者简介:韩辉邦（1987— ），男，工程师，主要从事人工影响天气相关技术研究. E-mail: hmjerry@163.com。
基金资助:
国家自然科学基金项目（41665008、41565008）资助

Accuracy Test of Precipitable Water Vapor Retrieved by GPS Data and Its Variation Characteristic in Qaidam Basin

HAN Huibang1,2, ZHANG Xiaojun1, ZHANG Boyue1,TIAN Jianbing1, KANG Xiaoyan1

(1. Weather Modification Office of Qinghai Province, Xining 810001, China;
2. Key Laboratory of Disaster Preventing and Reducing of Qinghai Province, Xining 810001, China)

Online:2020-02-29 Published:2020-03-13

摘要/Abstract

摘要： 利用柴达木盆地格尔木站2014年每日00:00和12:00 （世界时，下同）L波段探空数据计算得到的大气可降水量资料（PWV_RS）用来验证GPS数据反演的大气可降水量（PWV_GPS）精度。在此基础上，利用格尔木、德令哈两站PWV_GPS资料，对该地区大气可降水量PWV变化特征进行分析。结果表明：柴达木盆地PWV_RS和PWV_GPS逐日变化具有很好的一致性，PWV_GPS略高于PWV_RS，两者相关系数在0.9以上。夏秋季PWV_RS和PWV_GPS相关性明显好于冬春季，00:00的相关系数略高于12:00。00:00和12:00 PWV_GPS均方根误分别为1.8和2.4 mm，平均相对误差分别为0.2和0.4，平均偏差分别为4.2和4.3 mm。柴达木盆地PWV_GPS能够反映这一地区实际大气可降水量水平。柴达木盆地PWV_GPS月变化呈单峰型分布，7月最大、12月最小。PWV_GPS夏季最为丰富、秋季次之、冬季最小，呈南多北少的空间分布特征。柴达木盆地日均PWV_GPS为0.4～28.0 mm，逐时PWV_GPS为6.9～7.3 mm。

关键词: 大气可降水量, GPS大气可降水量, 精度检验, 柴达木盆地

Abstract: Based on the precipitable water vapor calculated by radiosonde data (PWV_RS) at 00:00 UTC and 12:00 UTC in 2014 at Golmud station of Qaidam Basin, the accuracy of precipitable water vapor retrieved by GPS data (PWV_GPS) was tested. Meanwhile, the variation characteristics of PWV_GPS was analyzed at Golmud and Delingha stations in Qaidam Basin. The results show that daily variations of PWV_GPS and PWV_RS were consistent and the correlation coefficient between them was more than 0.9. The correlation was better in summer and autumn than in winter and spring, the correlation coefficient at 00:00 UTC was slightly higher than that at 12:00 UTC. At 00:00 UTC and 12:00 UTC, the RMSE of PWV_GPS was 1.8 and 2.4 mm, and the MRE was 0.2 and 0.4, and the BIAS was 4.2 and 4.3 mm, respectively. Monthly variation of PWV_GPS presented a single peak distribution, the maximum appeared in July and the minimum appeared in December. PWV_GPS was rich in summer and shortage in winter, and it was more in south and less in north. The diurnal variation of PWV_GPS ranged from 0.4 to 28 mm and the hourly PWV_GPS ranged from 6.9 to 7.3 mm.

Key words: precipitable water vapor, precipitable water vapor retrieved by GPS data, accuracy test, Qaidam Basin

中图分类号:

P468.0+24

韩辉邦, 张小军, 张博越, 田建兵, 康晓燕. 柴达木盆地GPS大气可降水量精度检验及其变化特征[J]. 干旱气象, 2020, 38(1): 50-57.

HAN Huibang, ZHANG Xiaojun, ZHANG Boyue, TIAN Jianbing, KANG Xiaoyan. Accuracy Test of Precipitable Water Vapor Retrieved by GPS Data and Its Variation Characteristic in Qaidam Basin[J]. Journal of Arid Meteorology, 2020, 38(1): 50-57.