Characteristics Analysis of Cloud Motion Vectors in the Area of Danxiashan
WANG Sihua
LI Liwei
Abstract：Based on the data of a Doppler weather radar available every six minutes for the station of Shaoguan in 2021 to 2022,this paper combined the cross correlation tracking technique with the Barnes fil-ter to study the characteristics of cloud motion vectors for the area of Danxiashan.The results are shown as follows.For the study area,cloud frequencies had significant variations on the seasonal and diurnal scales,with the monthly peaks in June and September and the diurnal peaks at 12:00 to 20:00,respectively.Clouds moved relatively fast in late autumn,winter and early spring(from November to the following April)but relatively slow in the warm season(from May to October).Clouds moved mostly at the directions from 100°to 150°(with the southeasterly)in August and September and mostly from 200°to 260°(with the south-westerly)in the remaining months.In the early stage of the rainy season(from April to June),clouds ap-peared frequently and moved at high velocities,dominantly with the southwesterly and with small diurnal ranges in moving direction,and in the late stage of the rainy season(from July to September),they oc-curred less frequently and moved at low velocities,dominantly with the southeasterly and with large diurnal ranges in moving direction.
Keywords：climatologycloud motion vectorcross correlation trackingBarnes filterDanxiashan
Publication Date：2025-04-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 38-42 )