dust storm in china
DESCRIPTION
Dust Storm in ChinaTRANSCRIPT
Peshawa Mahmod
Categories Horizontal visibility Weather condition
Dust storm < 1 kmStrong and turbulent wind
Strong Sandstorm < 200m Wind velocity 20 km/s
Very strong sandstorm < 50m
Wind velocity 25 km/s
Strong wind at low level
Thermally unstable atmospheric stratification
Thick dry soil or sand
Natural conditionClimate
Soil and vegetation covers
topography
Human activities
Intensification of soil farming
Over grazing and Overstocking
Road and urban construction and min west
Vegetation cover Erosion
More than 60% Zero erosion
60-20% Medium erosion
Less than 20% High erosion
Source of dust-sand storm in China
- Taklimakan desert (Xinjiang region)
- Gobi Desert
Impact of dust-Sandstorm in China
Decade 1950-1960 1970-1980 1990
Desertification area (Km2)
1560 2100 2460
1-Environmental impact
2- Human impact (example of 5th may 1993)
- 115 Death, 264 injured
- Oxidative damage in lunge, heart and liver
3- Economic impact
70 $ million in 5th may 1993
Ability of human to control weather is very limited
thus the approaches point is to decrease the
density and frequency of dust-sandstorm.
Developing ecological barriers
Using wire fencing system with straw of wheat or reed
Using chemical waste materials
Policy reform to use land
Water use efficiency
An example of ecological barriers in Gansu province of Northwest of China
References Guoguang Zheng (2002), Dust storm; An Extreme Climate Event in China, China Metrological
Administration, Beijing.
Longiun Ci (2001) Disasters of Strong Sandstorms over Large Area and the Spread of
Land Desertification in China,. In: Youlin Yang, Victor Squires and Lu Qi, eds. Global
ala rm: Dust and Sandstorms from the World’s Drylands, Bangkok, pp. 215-226.
Qian Weihong, Xu Tang, Linsheng Quan (2004), Regional Characteristics of dust storm in
China, Atmospheric Environment, Vol. 38 pp. 4895-4907.
United Nation Environmental Program (2005) what is Dust storm. Environmental
Emergencies News, Issue 4 pp.1-4
Wang Xunming, Zhibao Dong, Jiawu Zhang, Lichao Liu (2004), Modern dust storm in china:
an overview, Journal of Arid Environment, vol. 58 pp. 559-547.
Wang Xiaobin, O. Oenema, W.B. Hoogmoed, U.D. Perdok, Dianxiong Cai (2006), Dust storm
Erosion and its impact on soil carbon and nitrogen losses in northern China, CATENA,
Vol. 66 pp. 221-227.
Yang Youlin, Victor Squires and Lu Qi (2001) Global Alarm: Dust and Sandstorms from the
World’s Drylands, Bangkok.
Thank you