Analysis of the Periodic Change Rule of Precipitation in the Northern Semi-Arid Area Based on Remote Sensing

Authors:Zhang Yannan, Liang Chuan


Using remote sensing technology to analyze the periodic change of precipitation in the northern semi-arid area, can provide scientific basis for the short-term, medium-term and long-term precipitation prediction in the north. Using GPS observation data and corresponding ground meteorological parameters, the comprehensive water vapor content values of Harbin, Changchun, Shenyang and Dalian stations in 1955-2005 are obtained. Based on the content values, the linear regression equation of precipitation and time is established to represent the precipitation trend changes of the four stations. The periodic precipitation series of the four stations in different time scales are obtained by wavelet analysis according to the structure and the law of abnormal change; The increase and decrease characteristics of precipitation in four stations are analyzed by combining with the anomaly calculation; And the periodic oscillation of precipitation in different time scales is reflected by using the Morlet continuous wavelet transform chart, and the distribution of regional precipitation with the scale year is reflected by using the wavelet variance chart. According to the analysis, the comprehensive precipitation series of four regions experience five cycles of less-more-less-more -less, and the precipitation fluctuation is the most obvious in 41-63a time period; The precipitation trend rate of Harbin, Changchun, and Dalian are -7.1 mm/10a, -12.7 mm/10a, -2.7 mm/10a, respectively, and that of Shenyang slightly increases to 1.3 mm/10a, which shows that the precipitation in the past 50 years in the four regions is decreasing. The results show that after 2005, Harbin and Changchun are in the period of 2-3a, 5-6a with short-term oscillation period, that in the period of 10a with little precipitation, in 20a with medium-term oscillation period and in 50a with long-term oscillation period. Shenyang and Dalian are in the period of 2-3a, 10a and 50a with more precipitation. The wavelet variance map reflects that the main periods of precipitation series in four stations are 6a, 14a, 20a, 37a and 50a respectively, and obtains the variation characteristics of precipitation in the whole time domain in the northern semi-arid area. The variation characteristics of precipitation in the whole time domain in the northern semi-arid area are obtained.

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