Research in the variation characteristics of temperature and precipitation for lately 50 years in the Qinghai Lake basin

This paper has made a research about variation characteristics of temperature and precipitation from 1961 to 2010years in the Qinghai Lake basin.The results showed that there emerged an increasing trend in the temperature,with the maximum linear rate of 0.40℃/10a.And there appeared four obvious increasing temperature periods,especially the time of the recent warming period is very long and the maximum increase is 0.1℃/a.Although precipitation has no obvious increasing trend,there existed in three significant increase periods.Maximum precipitation appeared from1988 to1989 years. For the seasonal change,the temperature presented different increasing trends.There was especially obvious increase in winter and autumn.The increase of seasonal precipitation is not obvious,and it mainly concentrated in summer with the multi-year average rainfall of 239.30mm,accounting for about 65% of the annual precipitation.The characteristics of temperature and precipitation change during recently 50years indicated that there is being in an increasing stage of the temperature and precipitation in the Qinghai Lake basin at the present.