930505特大沙尘暴沙尘在甘肃沉降状况研究

Research of Dust Depositions of 930505 Extremely Severe Sandstorm in Gansu

对发生在河西走廊东部的 930 5 0 5特大沙尘暴在甘肃省境内的降尘分布、降尘状况、降尘量等进行了研究。并对此次沙尘暴造成的大气环境的污染范围和有关报道的特强沙尘暴天气影响范围作了比较。前者的影响范围为 35 .5× 10 4 km2 ,后者为 7.0× 10 4 km2 。此次特大沙尘暴在甘肃 80 .7%的总土地面积上共尘降沙尘暴降尘 12 45 .3× 10 4 t·月 -1。

Research and analysis were carried out of the deposition distribution and amount of the 930505 extremely severe sandstorm occured at Jinchang, east Gansu corridor. The main results are as follows: (1) The dust deposition of the sandstorm corers 80.7 percentage of the tatal area of Gansu Province. The totaly amount of dust deposition in Gansu Province is estimated to reached 1 245.3×10\+4 t·mon\+\{-1\} with the maximum value of 699.4×10\+4 t·mon\+\{-1\} in Jinchang area. (2) The active duststorm weather region is about 7.0×10\+4 km\+2, but the area in which the atmospheric environment was severely degraded is much more larger and reach 35.5×10\+4 km\+2.