气候变化领域集成服务门户(CCPortal): Response of seasonal soil freeze depth to climate change across China

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DOI	10.5194/tc-11-1059-2017
	Response of seasonal soil freeze depth to climate change across China
	Peng X.; Zhang T.; Frauenfeld O.W.; Wang K.; Cao B.; Zhong X.; Su H.; Mu C.
发表日期	2017
ISSN	19940416
卷号	11 期号:3
英文摘要	The response of seasonal soil freeze depth to climate change has repercussions for the surface energy and water balance, ecosystems, the carbon cycle, and soil nutrient exchange. Despite its importance, the response of soil freeze depth to climate change is largely unknown. This study employs the Stefan solution and observations from 845 meteorological stations to investigate the response of variations in soil freeze depth to climate change across China. Observations include daily air temperatures, daily soil temperatures at various depths, mean monthly gridded air temperatures, and the normalized difference vegetation index. Results show that soil freeze depth decreased significantly at a rate of -0.18±0.03 cm yr-1, resulting in a net decrease of 8.05±1.5 cm over 1967-2012 across China. On the regional scale, soil freeze depth decreases varied between 0.0 and 0.4 cm yr-1 in most parts of China during 1950-2009. By investigating potential climatic and environmental driving factors of soil freeze depth variability, we find that mean annual air temperature and ground surface temperature, air thawing index, ground surface thawing index, and vegetation growth are all negatively associated with soil freeze depth. Changes in snow depth are not correlated with soil freeze depth. Air and ground surface freezing indices are positively correlated with soil freeze depth. Comparing these potential driving factors of soil freeze depth, we find that freezing index and vegetation growth are more strongly correlated with soil freeze depth, while snow depth is not significant. We conclude that air temperature increases are responsible for the decrease in seasonal freeze depth. These results are important for understanding the soil freeze-thaw dynamics and the impacts of soil freeze depth on ecosystem and hydrological process. © Author(s) 2017.
学科领域	air temperature; climate change; climate effect; environmental factor; freeze-thaw cycle; freezing; index method; NDVI; seasonality; soil depth; surface temperature; thawing; China
语种	英语
scopus关键词	air temperature; climate change; climate effect; environmental factor; freeze-thaw cycle; freezing; index method; NDVI; seasonality; soil depth; surface temperature; thawing; China
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119404
作者单位	Key Laboratory of Western China's Environmental Systems, Ministry of Education, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, 730000, China; Department of Geography, Texas AandM University, College StationTX 77843-3147, United States; Institute of Arctic and Alpine Research, University of Colorado at Boulder, Boulder, CO 80309, United States; Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China
推荐引用方式 GB/T 7714	Peng X.,Zhang T.,Frauenfeld O.W.,et al. Response of seasonal soil freeze depth to climate change across China[J],2017,11(3).
APA	Peng X..,Zhang T..,Frauenfeld O.W..,Wang K..,Cao B..,...&Mu C..(2017).Response of seasonal soil freeze depth to climate change across China.Cryosphere,11(3).
MLA	Peng X.,et al."Response of seasonal soil freeze depth to climate change across China".Cryosphere 11.3(2017).