Abstract:Based on the formulas recommended by the U.S. Environmental Protection Agency, the dust emission rates trend and impact factors of PM50 and PM30 were analyzed. Both the dust emission rates and the dust storm frequency decreased significantly during the period from 1960 to 2008 in the Taklimakan Desert; and the finer dust possessed more significant decreasing emission rate. The dust emission rates in the early 21th in Taklimakan desert decreased by 65.01% to 85.14% compared to that in 1960s. The contribution of mean wind velocity decreasing and precipitation increasing to the decrease of PM50 emission rate was 37.8% and 62.2% respectively; the decrease of mean wind velocity and blown sand winds frequency, and the increase of precipitation contribution to the decrease of PM30 emission rate was 9.1%, 33.2%, and 57.7% respectively; the decrease of mean wind velocity and blown sand winds contribution to the decrease of dust storm frequency was 41.3% and 58.7% respectively. The total amount both the coarse and fine particles will increase in atmosphere during the windy weather, but the latter had a more obvious trend.
李晋昌, 康晓云, 张彩霞. 塔克拉玛干沙漠近48年起尘速率变化趋势分析[J]. 中国环境科学, 2012, 32(1): 43-47.
LI Jin-Chang, KANG Xiao-Yun, ZHANG Cai-Xia. Change trend of dust emission rates in Taklimakan Desert in last 48 years. CHINA ENVIRONMENTAL SCIENCECE, 2012, 32(1): 43-47.