Affiliations: Key Laboratory of Desert and Desertification, Cold and
Arid Regions Environmental and Engineering Research Institute, Chinese Academy
of Sciences, Lanzhou 730000, China
Abstract: The purpose of this present study is to investigate the frequency
and variation of sandstorm in Minqin Oasis. Using daily observational data of
sandstorm and other meteorologic data from 1954 to 2000, we have illuminated
the relationship between sandstorm, meteorological parameters and human
activities. The results of the analysis show that the highest frequency of
sandstorms occurrence and their duration mainly focus on March, April and May,
especially in April. Most of sandstorms occur from midday to nightfall, but
relative few appear from midnight to forenoon, which apparently correlates to
the daily variations of atmospheric thermal stability within atmospheric
boundary layer. Monthly mean and annual mean duration of sandstorms coincide
well with the frequencies of sandstorm occurrence.