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Mechanism and Force Driven Asian Dust Storm

Mechanism and Force Driven Asian Dust Storm. Wang Guo Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, No. 3, Datun Road, outside Andingmen, Beijing 100101,People's Republic of China Email: wg699@hotmail.com.

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Mechanism and Force Driven Asian Dust Storm

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  1. Mechanism and Force Driven Asian Dust Storm Wang Guo Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, No. 3, Datun Road, outside Andingmen, Beijing 100101,People's Republic of China Email: wg699@hotmail.com

  2. 1. Modern Sources of and Paths Asia Dust storm (1) Favonian Dust storm The dust storm covers from Asia to the Midwest of America. (2) Subtropical Dust storm It covers circum-Mediterranean Sea

  3. This SeaWiFS image show the development of a large dust storm in Asia and its interaction with a meteorological system that carried the dust far out into the Pacific Ocean. From April 16, 1998, the bright yellowish-brown cloud near the coast is the center of the storm, being pushed by a frontal system. April 20-24, the atmospheric circulation around a low-pressure system entrains the dust from the storm and carries it over the north Pacific Ocean. One of Sources of Favonian Dust storm

  4. SeaWiFS image of the west coast of North America on April 25, showing the arrival of airborne dust from Asia. The dust is visible in the clouds at the center of the left edge of the image, and as streaks of light brown haze over Cape Mendocino on the California coast.

  5. (a) China, April 17, 2001, as captured by SeaWiFS (b) Japan, April 17, 2001, as captured by SeaWiFS

  6. Duststorm over America (a) San Diego, California, on January 3, 2001, as captured by SeaWiFS (b) Superior, April 17, 2001, as captured by SeaWiFS

  7. The Middle East Dust Storm, May, 20, 1999, from SeaWiFS The large dust storm off of North Africa on April 18th 2001.

  8. Upper Lift: On the Coast of West Africa, dust storms, Feb. 26, 2000 from SeaWiFS Right: the large dust storm off the coast of North Africa on July 18th 2000 Upper Right: This SeaWiFS image clearly shows a massive dust storm over Libya. The image was taken on August 23, 2001

  9. 2. Favonian Floating Dust Change over China in the last 50 Years (1) Change in Space-time The Floating Dust in China prevailed in 1950s -1970s, began to weaken in 1980s. And it is small since 1990s . (2) Nationwide Trendline in Time Days of Dust storm is decreased in China since 1954.

  10. Change of Days of Dust storm in China from 1954 to 2001 The total trence is decrease, Dust Storm Maximum is in 1666

  11. 2. Dust Storm Change over China in the last 1700 Years There are 5 activity periods of dust storm in China, 1060-1090, 1160-1270,1470-560,1610-1700,1820-1890 since AD. 300

  12. 3. Dust Storm Change over China in Quaternary Loess sediment in China occur in glacial, paleo-soil develop in interglacial.

  13. 4. Onset of Asian desertification by 22 Myr ago inferred from loess deposits in China Dust accumulation rate (DAR) in northern China. Data for 0–6.2 Myr interval are calculated based on the loess–soil sequence and the Hipparion Red-Earth formation at Xifeng. It show that the loess sedmentary rate in cold period is greater than in warm period. (from Nature, 416, 159 - 163, 2002 )

  14. 5. Dust Storm in China and Cooling • On scale of 50 years: 1960s,1970s • On scale of 1000 years: little glacial • On scale of 2Ma: glacial loess • On scale of 22Ma: the high sedimentary rate in the last 3Ma.

  15. 6. Conclusion • Asia Dust storm driven by climatic system. Dust storm in Asian westerlies relate to cool. • Human activity don’t play a important role on Asia Dust storm.

  16. Thank You

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