| Weather and Climate |
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| Spatialtemporal Variations of Thunderstorms in Aksu, Xinjiang, China |
| Ali Mamtimin1,2, Hajigul Sayit3, HE Qing1,2, HUO Wen1,2, YANG Xing-hua1,2, LIU Xin-chun1,2 |
1.Institute of Desert Meteorology, China Meteorological Administration, Urumqi 830002, China;
2.Taklimakan Desert Atmosphere and Environment Observation Experiment Station, Tazhong 841000, Xinjiang, China;
3.Compilation & Translation Room of Xinjiang Meteorological Bureau, Urumqi 830002, China |
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Abstract The spatial-temporal variations and change trend of thunderstorms happened in Aksu were analyzed by means of climate diagnose methods such as climatic trend rate and guarantee rate, and based on observation data of thunderstorms from 1960 to 2010. Results showed that: (1) The spatial distribution pattern of thunderstorms in Aksu was characterized by rare in south and east but much in north and west, and with the most frequency in the Uchturpan County. (2) The mean annual thunderstorm frequency in Aksu area ranged from 18.7 to 52.0 days. (3) The variation of the annual thunderstorm days in Aksu decreased at the rate of 2.8 days per decade in these 50 years. (4) Thunderstorms mainly occurred from March to November, with peak in July. There were almost no thunderstorms from late November to the next February. (5) Under the guarantee rate of 80%, the initial day of thunderstorms occurred in period from the second pentad to the third pentad of May, and the last date occurred from the third pentad of September to the second pentad of October. (6) Thunderstorms frequently occurred from afternoon to midnight and the peak appeared in 16:00-19:00. The mean duration was 35~47 minutes and the most frequent direction of thunderstorms was north and west.
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Received: 21 October 2011
Published: 19 December 2011
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2012, Vol. 32 
