Characteristics of temperature and precipitation on the Loess Plateau from 1961 to 2014
The pattern and characteristics of climate changes on the Loess Plateau were analyzed with the methods of the linear regression, cumulative anomaly, Mann-Kendall test and Morlet wavelets analysis based on monthly temperature and monthly precipitation data observed at 52 meteorological stations from 1961 to 2014. The results showed that the climate on the Loess Plateau featured a signiifcant warming trend, and the annual mean temperature has increased by 0.31℃?10a?1 (P < 0.01) from 1961 to 2014, and an abrupt change from low temperature to high temperature occurred in 1991. The four seasonal temperatures all showed increasing trends, especially in winter with the increasing rate of 0.44℃?10a?1. The decadal change in temperatures also showed increasing trends, and exhibited greater warming rates since 1991, especially for winter temperature. The warming rate was larger on the northern Loess Plateau than that on the southern Loess Plateau, and featured greater warming rate with higher latitude. The annual precipitation showed a decreasing trend in recent 54 years, and has decreased by ?7.51 mm?10a?1 (P>0.05) from 1961 to 2014, and the precipitation in 1960s was higher, while in 1990s was less. The seasonal precipitation showed various trends. The autumn, summer and spring precipitation showed decreasing trends, especially for autumn precipitation by ?3.56 mm?10a?1, while the winter precipitation showed an increasing trend of 0.43 mm?10a?1. The southeastern Loess Plateau showed greater decreasing trend in precipitation, while the northwestern Loess Plateau showed negligible trend. The climate change interval analysis revealed that the annual mean temperature lfuctuated with the intervals of 4 years and 7~9 years, and the annual precipitation lfuctuated with intervals of 5~7 years and 12~14 years. Overall, the climate was tended to be warmer and dryer in recent 54 years on the Loess Plateau.
NETL
NSTL
万方数据
维普
