The Variation Characteristic And Relationship Analysis Of Heat Resources And Sea-land Pressure In North China

Based on the daily temperature data during 1958 to 2007 in North China, the change trends and characteristic of temperature, and its relationship with sea-land pressure index relations have been discussed in detail.In recent 50 years, temperature of North China was on the rise obviously, especially after 90s of the 20th century. The warming rate of minimum temperature was greater than mean temperature and maximum temperature. Warming effect of winter minimum temperature was the largest, while summer maximum temperature is the smallest. The extreme temperature was on the rise remarkably, and heating rate of extreme minimum temperature was greater than extreme maximum temperature. Heating effect of Inner Mongolia plateau and Loess plateau in northern with higher elevation was larger than North China Plain with lower elevation in northeast.≥0℃&≥10℃accumulated temperature was rise remarkably, and the trend of≥0℃&≥10℃accumulated temperature in Inner Mongolia plateau and north of the north China plain was higher than other parts of the North China. The start time of≥0℃&≥10℃was advanced, however the terminal time was delayed.Spring and autumn sea-land pressure index has increased, but have reduced in winter from 50's to 80's. Spring, autumn and winter sea-land pressure index have decreased since 80's. Correspondingly, spring and autumn average temperature has decreased from 50's to 80's, but winter average temperature has increased. Spring, autumn and winter mean temperature have increased. Significantly negative relationship has been performed between land area pressure and spring, autumn, winter mean temperature, however positive correlation with marine area pressure.