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| Study on Extreme Characteristics of Temperature, Humidity and Daily Temperature Difference in Dunhuang |
| Received:June 04, 2014 Revised:June 23, 2014 |
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| DOI：10.7643/issn.1672-9242.2014.04.015 |
| KeyWord:the extreme meteorological factors the Gumbel model location parameter scale parameter the maximum likelihood method return period |
| Author | Institution |
| LIU Yan-lin |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| GUO Zan-hong |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| TANG Qi-huan |
Southwest Technology and Engineering Research Institute, Chongqing , China |
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| Abstract: |
| Objective To establish an annual extreme fitting model of temperature, relative humidity and daily temperature difference in Dunhuang area. Methods According to the daily data of temperature and relative humidity at the local meteorological station, we statistically analyzed the annual extreme value of three elements. Then we established the elements of the annual extreme value Gumbel model by the likelihood method. And we discussed a bounded domain of meteorological elements in the extreme return period domain at the same time. Results We presented the annual extreme Gumbel model parameters of the temperature, relative humidity and daily temperature difference in Dunhuang area. Conclusion The Gumbel model of meteorological factors in Dunhuang area gave the location parameter and scale parameter. The maximal temperature was 35. 193, 1. 072 ℃ , and the minimal temperature was-20. 085, 1. 945 ℃ . The maximal relative humidity was 95. 254, 2. 471% , and the minimal relative humidity was 5. 837, 1. 505% . The maximal daily temperature difference value was 20. 676, 0. 777 ℃ , and the minimal daily temperature difference value was 1. 398, 0. 593 ℃ . The return periods of the maximal relative humidity, the minimal relative humidity and the minimal daily temperature difference value were 6. 3 years,47 years and 10 years, respectively. |
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