Page 273 - 《高原气象》2022年第5期

高 原 气 象 41 卷
1366

A Study on the Principle of Space-time Matching for the Detection of Cloud

Height Consistency by Radiosonde and Millimeter-Wave Cloud Radar

2
2
WANG Jin 1，2，5，6 ，ZHANG Lei ，DU Tao ，LI Yan ，YUE Zhiguo ，LI Jinhui ，
1，6
1，6
1，6
ZHOU Xu ，CHEN Chuang ，DING Jie 2
3，6
4，5
（1. Center of Weather Modification of Shaanxi Province，Xi’an 710016，Shaanxi，China；
2. Key Laboratory for Semi-Arid Climate Change of the Ministry of Education，College of Atmospheric Sciences，
Lanzhou University，Lanzhou 730000，Gansu，China；
3. Meteorological Institute of Shaanxi Province，Xi’an 710016，Shaanxi，China；
4. Chinese Academy of Meteorological Sciences，Beijing 100081，China；
5. Key Laboratory for Cloud Physics of China Meteorological Administration，Beijing 100081，China；
6. Key Laboratory of Eco-Environment and Meteorology for the Qinling Mountains and
Loess Plateaue，Xi’an 710016，Shaanxi，China）

Abstract：When comparing the consistency of the cloud vertical structure detected by L-band radiosonde and
millimeter-wave cloud radar，the observation error caused by the drift deviation of radiosonde balloon shouldn’t
be ignored. Therefore，the principle of time matching and space matching of screening the samples is put forward
which can effectively reduce it. By analyzing a total of 406 pairs of cloud base and top height samples observed
by radiosonde and cloud radar at Xi’an Jinghe Meteorological Station over a period of 508 days from August 17，
2017 to December 31，2018. The results showed that when using the principle of time and space matching to
screen cloud height samples，the correlation coefficients of them were significantly improved and the errors
caused by the balloon drifting were effectively reduced. The correlation coefficients of the cloud base/top height
samples increased from 0. 70/0. 66 to 0. 98/0. 97 by using the time matching and space matching principle，and
the mean square root errors decreased from 2009 m/2148 m to 602 m/708 m，and the mean absolute percentage
errors reduced from 47%/47% to 14%/9%. Using only the time matching principle can greatly improve the corre‐
lation coefficients of cloud base height samples，which average value increased from 0. 35 to 0. 86. When filter‐
ing the cloud top heights，the principle of time and space matching must be used at the same time to effectively
improve the consistency of the two observations. Whether or not the time and space matching principle are used
to select the samples，the cloud base and top heights observed by radiosonde are higher than those observed by
cloud radar. In addition，the correlation coefficients of the cloud base and top height samples do not decrease
with the increase of their relative distances.
Key words：Millimeter-wave cloud radar；L-band radiosonde；cloud vertical structure；consistency compari‐
son；time matching；space matching