Abstract
The remote sensing technology is used to analyze the periodic changes of precipitation in the semi-arid areas of northern China and provide a reference basis for precipitation prediction. Authors were based on GPS observation data and corresponding ground meteorological parameters to obtain the study area’s comprehensive water vapor content value and use precipitation and time to establish a linear regression equation based on the content value to express the precipitation trend change. The periodic structure and abnormal changes of the periodic precipitation series on different time scales were obtained through wavelet analysis, combined with anomaly calculations to analyze the increase and decrease precipitation characteristics. The Morlet continuous wavelet transform map was also used to reflect the periodic oscillations of precipitation on different time scales. The wavelet variance map was used to reflect the distribution of regional precipitation with scale years. The authors analyzed the cycle change characteristics of the comprehensive precipitation series in Harbin, Changchun, Shenyang, and Dalian. They concluded that the annual precipitation in the four regions showed a decreasing trend in 50 years. And through the wavelet cycle frequency-domain relationship change law, the change characteristics of precipitation in the northern semi-arid area in the entire time domain were obtained.
Highlights
Global warming has led to global and regional climate change, frequent occurrence of high temperature, drought, flood, and other disastrous weather, causing ecological and environmental deterioration, seriously affecting agricultural production, social economy, and sustainable development (Bi et al 2018)
Lan Yongchao et al studied the impact of climate change on the water resources system in the upper reaches of the Yellow River; Xu Yueqing et al studied the law of precipitation change in Hebei Plain based on wavelet analysis; Lin Zhenyao et al studied the temporal and spatial characteristics of temperature and precipitation change in the Qinghai Tibet Plateau; Dai Xingang et al studied the multi-scale characteristics of precipitation in flood season and the inter-generational decay characteristics of summer monsoon in North China Levy
The research on the change rules of precipitation time series and the characteristics of multi-time scales in the semi-arid area of North China is the basis of the research on how to mine the water production potential and development degree of grain crops, which is of great theoretical significance for the rational development of grain production in the commodity grain production area of North China
Summary
Global warming has led to global and regional climate change, frequent occurrence of high temperature, drought, flood, and other disastrous weather, causing ecological and environmental deterioration, seriously affecting agricultural production, social economy, and sustainable development (Bi et al 2018). The northern part of China is located in the northernmost end of the East Asian monsoon, which belongs to the temperate continental monsoon climate (Guo et al, 2019; Huang et al, 2018) It is the transitional zone between the humid Eastern monsoon region and China’s arid inland region (Colliander et al, 2017). The climate and its evolution are pretty different (Dai et al, 2018; Ren et al, 2019; Zeng et al, 2018) It is a typical “vulnerable area” and one of the most sensitive areas affected by climate warming. Lan Yongchao et al studied the impact of climate change on the water resources system in the upper reaches of the Yellow River; Xu Yueqing et al studied the law of precipitation change in Hebei Plain based on wavelet analysis; Lin Zhenyao et al studied the temporal and spatial characteristics of temperature and precipitation change in the Qinghai Tibet Plateau; Dai Xingang et al studied the multi-scale characteristics of precipitation in flood season and the inter-generational decay characteristics of summer monsoon in North China Levy
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