| Weather and Climate |
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| A Sensitive Experiment of Impact of Tianshan Mountains Landform on a Rainstorm Process |
| MA Yu-fen, ZHAO Ling, ZHAO Yong |
| Institute of Desert Meteorology, China Meteorological Administration, Urumqi 830002, China |
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Abstract For quantitatively studying the effect of the Tianshan Mountains landform on regional rainstorm, a simulation experiment with WRFV3.1 model on a rainstorm process accompanied by gale and cold wave occurred at the night of 24th and lasted till the night of 26th of May, 2009 in Xinjiang was conducted. A set of sensitive experiments were designed through changing the topographic height of the Tianshan Mountains. Some conclusions are drawn as follows: (1) The topographic effect of the Tianshan Mountains is one of the dominating causes of rainstorm occurring in the Tianshan Mountains. The higher the terrain of the Tianshan Mountains is, the more uneven of the rainfall distribution, and the more outstanding of the zonal distribution of the precipitation on the windward slope, also the lager the maximum precipitation on the windward slope. The topographical effect is significant in increasing the rainfall volume on the windward slope, which also plays a great role in the distribution of rainfall region. (2) The Tianshan Mountains not only obstructs the northeastward moving of the warm and wet flows from the southwest, but also divides this air stream into two parts and further makes the north part become weaker and wider while made the south part stronger and wider. (3) Topographic blocking of the Tianshan Mountains contributes to the upward movement of warm and wet airflows over the Tianshan Mountains, which creates the vertical flow ascending condition during a rainfall process; and it also contributes to the upward movement of warm and wet airflows over the north slope of the Kunlun Mountains to some extent. (4) The Tianshan Mountains plays a great role not only in obstructing and retarding the air stream from the northwest part of the Junggar Basin to the north slope of the Tianshan Mountains, but also in formation of the notable gale fields along the Lanzhou-Xinjiang railway, namely "Sanshili wind field" and "Baili wind field", as well as the gale belt in the north slope of Khan Tengri Peak. The higher the topographic height is, the stronger the forcing uplifting function and the more fierce vertical rising movement. (5) The Tianshan Mountains can significantly alleviate the extent of air cooling in the Tarim Basin and the Junggar Basin, while that in the former is much more obvious than that in the latter.
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Received: 23 October 2011
Published: 08 February 2012
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2012, Vol. 32 
