| 国家重点基础研究发展规划 |
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| Analysis of Temperature Fluctuations during a Dust Storm |
| XIE Liang, ZHANG Jing-hong |
| Key Laboratory of the Ministry of Education for Mechanics on Disaster and Environment in Western China, Lanzhou University, Lanzhou 730000, China |
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Abstract Near surface wind velocity and temperature at 0.5 m, 1.0 m, 8.0 m and 16 m were measured during a dust storm in Minqin in April 24, 2010, and the measuring frequency of wind velocity and temperature was all 50 Hz. Measurement results show that the dust storm presented a severe dust storm type during the first two hours, then into dust storm type. The wind speed during April 24 to 27 underwent three stages which contained an increasing period, a contemporary stable period and a decreasing period. Analysis of the wind and temperature of the first stage (from 19:00 of April 24 to 18:00 of the next day) showed that the fluctuation of temperature increased sharply during the severe dust storm period, the reason for that was the transportation of temperature caused by horizontal advection, while the variations of the mean and fluctuation intensity of temperature in the following dust storm period were basically caused by radiation change. Calculation results showed that the probability distribution of temperature fluctuation was Gaussian distribution, indicating that the dust particles had no influence on the distribution of temperature. Spectrum analysis confirmed the existence of a buoyancy scaling region in the frequency range below 1 Hz, either at night or daytime; while the temperature spectra were apparently different at night and day for the frequency higher than 1 Hz.
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Received: 01 December 2010
Published: 20 May 2011
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2011, Vol. 31 
