Abstract:

By using the observation data from meteorological stations in Zoige from 1957 to 2011, the changes of the initial date, final date, continuous days and the accumulated temperature above 0 ℃ in different years were analyzed. The accumulated temperature mutation test was analyzed. It was found that the initial date of the accumulated temperature above 0℃ was not obviously earlier, it’s final date was obviously later and it’s continuous days showed increasing trend. There was a very obvious ascending trend for the variation of annual accumulated temperature above 0℃ in Zoige from 1957 to 2011. In 1997 the annual accumulated temperature had abrupt change. The ascending trends of annual accumulated temperature above 0℃ and continuous days were most significant form1998 to 2011. Under the each accumulated frequency, continuous days above 0℃ from 1998 to 2011 were higher than that from 1957 to1997, that was, the initial date was advanced and the final date was postponed, and the accumulated temperature above 0℃ from 1998 to 2011 was higher than that from 1957 to1997.〖HJ1〗〖HJ〗