| Spatiotemporal variations of maximum seasonal freeze
depth in 1950s–2007 over the Heihe River Basin,
Northwest China |
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| 作者姓名： | QingFeng Wang TingJun Zhang |
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| 基金项目： | supported by the Global Change Research Program of China (No. 2010CB951402);the Natural Science Foundation of China (Nos. 91025013, 91325202);the State Key Laboratory of Frozen Soil Engineering (No. SKLFSE-ZY-06), CAS, China;the Major Research Plan of the Natural Science Foundation of China (No. 2013CBA01802) |
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| 摘 要： | Investigation on spatiotemporal variations of maximum seasonal freeze depth （MSFD） over the Heihe River Basin is of great importance for systematic understanding of regional climate and environmental change, ecological-hydrological processes, water resources assessment, construction and resource development. Based on soil and air temperatures at the meteorological stations of the China Meteorological Administration （CMA） over the Heihe River Basin, MSFDs time series are structured into a composite time series over the 1960-2007 period. Evaluating the averaged MSFD time series for 1960 2007 reveals a statistically significant trend of 4.0 cm/decade or a net change of-19.2 cm for the 48-year period over the basin. The MSFD had significantly negative correlation with mean annual air temperature （MAAT）, winter air temperature, mean annual ground surface temperature （MAGST）, degree days of thawing for the air （DDTa） as well as for the surface （DDTs）, and degree days of freezing for the surface （DDFs）. While there was significantly positive correlation between DDF,. and MSFD time series, MSFD was deeper and changed greatly in the Heihe River source area. It was shallower in the east-central basin and gradually deepened in other sections of the basin. The MSFD distribution pattern in 2003-2005 is consistent with that of averaged degree days of freezing for air （DDFa） in 1960-2007. However, the maximum of MSFD may not be accurate, because there is no long term observation data in the deep seasonally frozen ground regions near the lower boundary of permafrost. With increasing elevation, averaged DDFa increased at a rate of 51.6 ℃-day/100m, therefore, the MSFG and the date reaching MSFG became deeper and later, respectively.
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| 关 键 词： | 中国西北地区 冻结深度 黑河流域 时空变化 季节 年平均气温 水资源论证 时间序列 |
Spatiotemporal variations of maximum seasonal freeze depth in 1950s-2007 over the Heihe River Basin,Northwest China |
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| QingFeng Wang,TingJun Zhang.Spatiotemporal variations of maximum seasonal freeze depth in 1950s-2007 over the Heihe River Basin,Northwest China[J].Sciences in Cold and Arid Regions,2014,6(3):0209-0218. |
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| Authors: | QingFeng Wang and TingJun Zhang |
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| Institution: | State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research
Institute, CAS, Lanzhou, Gansu 730000, China;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, 80309, USA |
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| Abstract: | spatiotemporal variations MSFD potential driving variables seasonally frozen ground Heihe River Basin |
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| Keywords: | spatiotemporal variations MSFD potential driving variables seasonally frozen ground Heihe River Basin |
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