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| Spatial and Temporal Characteristics of Extremely Weak Precipitation in the Area Around the Taklimakan Desert |
| Wang Xinping1,2, Yang Qing1 |
1. Institute of Desert Meteorology, China Meteorological Administration, Urumqi 830002, China;
2. College of Mathematics and System Sciences, Xinjiang University, Urumqi 830046, China |
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Abstract With the daily precipitation data of 40 meteorological stations surrounding the Taklimakan Desert from 1961 to 2009 and four precipitation indices, the spatio-temporal variations of extremely weak precipitation in this area were analyzed in this paper. The Mann-Kendall method and F test were used to verify and calculate the trends and the changing rates of these indices in each station. Monte Carlo simulation was used to verify the regional significance of precipitation events and Copula function was used to determine the joint distribution and return period for every two of these indices. The results showed that: (1) CDD frequently ranged 80-100 days and exhibited a decreasing trend. The most frequent D25 values ranged 0-10 days, the number of days with extremely precipitation increased over time. Most P25 values ranged 0-1.5 mm, but values of 2-3 mm began to appear after 2000. I25 with the highest frequency ranged 0.1-0.3 mm, I25>0.4 mm was extremely rare; and (2) the spatial distribution of CDD in each 5-year period showed patterns contrasting those of D25 and P25. The joint return period for most values was short, and the occurrence probability of diverse types of extreme precipitation events is different.
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Received: 28 April 2013
Published: 20 September 2014
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2014, Vol. 34 
