Climate change analysis in Hotan region of southern Xinjiang——A case of northern oasis region

Using the average monthly temperature,precipitation and relative humidity information of six weather stations in Hotan region during 1960 - 2008,a linear tendency,Mann-kendall,a total anomaly and Morlet wavelet analysis methods were used to analyze the three elements of 49a temperature,precipitation and relative humidity,the space-time of four seasonal change,mutation and cycle characteristics in Hotan region. Results showed that: (1) From west to east,showing a drop in temperature,precipitation and humidity;(2) temperature,precipitation and relative humidity had a linear increasing trend,temperatures and relative humidity increases in winter especially,and the more obvious increasing precipitation in summer; (3) temperature,precipitation and relative humidity had significant changes in inter-decadal and inter-annual cycle; inter-annual cycle had more complex and significant inter - decadal oscillation period than inter-decadal cycle;(4) mutations of temperature,precipitation and relative humidity occurred during 49a,the point mutation of year and seasonal elements and the mutation were differend; (5) between the three elements,temperature and precipitation,temperature and relative humidity had a anti-correlation,precipitation was positively related to relative humidity.