Resources Science ›› 2016, Vol. 38 ›› Issue (9): 1733-1741.

• Orginal Article •

### Variation in ground temperature at a depth of 0 cm and the relationship with air temperature in China from 1961 to 2010

WANG Jialin1(), PAN Zhihua1(), HAN Guolin1, CHENG Lu2, DONG Zhiqiang1, ZHANG Jingting1, PAN Yuying1, HUANG Lei1, ZHAO Hui1, FAN Dongliang1, WU Dong1

1. 1. College of Resources and Environmental Sciences,China Agricultural University,Beijing 100193 ,China
2. National Meteorological Center,Beijing 100081,China
• Received:2016-01-26 Revised:2016-06-20 Online:2016-09-25 Published:2016-09-22

Abstract:

In recent years,climate warming has become a global problem. As the underlying surface is the direct heat and water source of the atmosphere,it has a strong effect on forming and maintaining local climates. The study of ground temperature variation characteristics helps to understand climate change more clearly and researching the relationship between ground temperature and air temperature variation is of great significance to understanding the mechanism of climate change. Based on daily mean air temperature and ground temperature at a depth of 0 cm from 581 stations during 1961 to 2010,correlation analysis and Mann-Kendall nonparametric tests,spatial and temporal variation characteristics,regional differentiation characteristics and seasonal differentiation characteristics of ground temperature at the depth of 0 cm and air temperature were analyzed. The results indicate that ground temperature at a depth of 0 cm in China decreased and then increased with an abruption around 2000,after the abruption the rising trend of ground temperature tended to be more obvious. In most regions,ground temperature at 0 cm rose and the trend in the north was more obvious than the south. The rise in ground temperature at 0 cm in winter was more apparent than in summer. Correlation analysis showed that variation air temperature and ground temperature at 0 cm were similar,but before the1970s and after the 20th century,large differences were apparent. Compared to variation in air temperature,ground temperature at 0 cm from 1961 to 2010 tended to have a larger range and later abruption.