Variations in soil temperature at BJ site on the central Tibetan Plateau |
| |
Authors: | Guoning Wan Meixue Yang Xuejia Wang |
| |
Institution: | 1. State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, China 2. Graduate University of Chinese Academy of Sciences, Beijing, 100049, China
|
| |
Abstract: | The temporal and spatial variation in soil temperature play a significant role in energy and water cycle between land surface
and atmosphere on the Tibetan Plateau. Based on the observed soil temperature data (hourly data from 1 January 2001 to 31
December 2005) obtained by GAME-Tibet, the diurnal, seasonal and interannual variations in soil temperature at BJ site (31.37°
N, 91.90° E; 4509 a.s.l.) near Naqu in the central Tibetan Plateau were analyzed. Results showed that the average diurnal
variation in soil temperature at 4 and 20 cm depth can be described as sinusoidal curve, which is consistent with the variation
of solar radiation. However, the average diurnal variation in soil temperature under 60 cm was very weak. The average diurnal
amplitude in soil temperature decreased by the exponential decay function with the increase of soil depth (R2=0.92, p<0.01). It is demonstrated that the average diurnal maximum soil temperature decreased by the exponential decay function
with the increase of soil depth (R2 =0.78, p<0.01). In contrast, the average diurnal minimum soil temperature increased by the exponential grow function with
increasing of soil depth (R2=0.86, p<0.01). There were a linear negative correlation between the average annual maximum Ts and soil depth (R2=0.96, p<0.01), a logarithmic function relationship between the average annual minimum soil temperature and soil depth (R2=0.92, p<0.01). The average seasonal amplitude in soil temperature followed the exponential decay function with the increase
of soil depth (R2=0.98, p<0.01). The mean annual soil temperature in each layer indicated a warming trend prominently. During the study period,
the mean annual soil temperature at 4, 20, 40, 60, 80, 100, 130, 160, 200 and 250 cm depth increased by 0.034, 0.041, 0.061,
0.056, 0.062, 0.050, 0.057, 0.051, 0.047 and 0.042 °C /a, respectively. |
| |
Keywords: | Tibetan Plateau Land-atmosphere interaction Soil temperature Climate warming |
本文献已被 CNKI SpringerLink 等数据库收录! |
|