Impacts of historic climate variability on seasonal soil frost in the midwestern United States.
Impacts of historic climate variability on seasonal soil frost in the midwestern United States.
复制标题
历史气候变化对美国中西部季节性土壤霜冻的影响。
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
V. Mishra
中科院分区：
文献类型：
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作者：
T. Sinha;K. Cherkauer;V. Mishra
摘要本研究探讨了历史气候变化对冷季过程的影响，包括土壤温度、霜冻深度、霜冻天数和冻融循环次数。考虑到空间和时间变化在冷季过程中的重要性，这项研究是在美国中西部进行的，同时使用观测和模式模拟。模型模拟使用可变入渗能力（维克）陆面模型（LSM）来重建和分析长期变化（即，1917-2006年）土壤霜冻变量的平均值。维克模型进行了校准，使用观测到的径流记录和近地表土壤温度，然后评估径流，土壤温度，霜冻深度和土壤水分之前，其应用程序在区域尺度。土壤霜冻指标，如霜冻天数和冻融循环的数量，确定从观察到的记录，并进行了测试的存在下显着的趋势。极端和平均的总体趋势..
Abstract The present study examines the effects of historic climate variability on cold-season processes, including soil temperature, frost depth, and the number of frost days and freeze–thaw cycles. Considering the importance of spatial and temporal variability in cold-season processes, the study was conducted in the midwestern United States using both observations and model simulations. Model simulations used the Variable Infiltration Capacity (VIC) land surface model (LSM) to reconstruct and to analyze changes in the long-term (i.e., 1917–2006) means of soil frost variables. The VIC model was calibrated using observed streamflow records and near-surface soil temperatures and then evaluated for streamflow, soil temperature, frost depth, and soil moisture before its application at the regional scale. Soil frost indicators—such as the number of frost days and freeze–thaw cycles—were determined from observed records and were tested for the presence of significant trends. Overall trends in extreme and mean ...