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Recent changes in ground surface thermal regimesin the context of air temperature warmingover the Heihe River Basin, China
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Citation of this paper:QingFeng Wang,TingJun Zhang,XiaoQing Peng,Bin Cao,2014.Recent changes in ground surface thermal regimesin the context of air temperature warmingover the Heihe River Basin, China.Sciences in Cold and Arid Regions,6(4):0273~0281.
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Author NameAffiliationE-mail
QingFeng Wang State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China qf_w@lzb.ac.cn 
TingJun Zhang 1. College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, Gansu 730000, China 2. National Snow and Ice Data Center, Cooperative Institute for Research in Environmental Sciences, University of Colorado at Boulder, Boulder, 80309, USA  
XiaoQing Peng College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, Gansu 730000, China  
Bin Cao College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, Gansu 730000, China  
 
Abstract:Changes in ground surface thermal regimes play a vital role in surface and subsurface hydrology, ecosystem diversity and productivity, and global thermal, water and carbon budgets as well as climate change. Estimating spring, summer, autumn and winter air temperatures and mean annual air temperature (MAAT) from 1960 through 2008 over the Heihe River Basin reveals a statistically significant trend of 0.31 °C/decade, 0.28 °C/decade, 0.37 °C/decade, 0.50 °C/decade, and 0.37 °C /decade, respectively. The averaged time series of mean annual ground surface temperature (MAGST) and maximum annual ground surface temperature (MaxAGST) for 1972–2006 over the basin indicates a statistically significant trend of 0.58 °C/decade and 1.27 °C/decade, respectively. The minimum annual ground surface temperature (MinAGST) in the same period remains unchanged as a whole. Estimating surface freezing/thawing index as well as the ratio of freezing index to thawing index (RFT) in the period between 1959 and 2006 over the basin indicates a statistically significant trend of -42.5 °C-day/decade, 85.4 °C-day/decade and -0.018/decade, respectively.
keywords:air temperature  ground surface temperature  freezing index  thawing index  tendency rate  Heihe River Basin
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