Effects of soil moisture on the responses of soil temperatures to climate change in cold regions
Effects of soil moisture on the responses of soil temperatures to climate change in cold regions
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DOI：
10.1175/jcli-d-12-00305.1
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发表时间：
2012-12
影响因子：
4.9
通讯作者：
Z. Subin;C. Koven;W. Riley;M. Torn;D. Lawrence;S. Swenson
中科院分区：
文献类型：
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作者：
Z. Subin;C. Koven;W. Riley;M. Torn;D. Lawrence;S. Swenson
在高纬度地区，土壤湿度的变化可以通过与雪热整流的相互作用而独立于气温变化而改变土壤温度。在设定了大气强迫和植被状态的群落土地模式4 （CLM4）中，通过模式试验研究了这一机制。在平衡历史条件下，植物经历的CO2浓度从285 ppm增加到857 ppm，导致全球部分地区土壤充水孔空间局地增加0.1 ~ 0.2。在经历这种湿润的永久冻土区，垂直和年平均土壤温度升高了3°C（所有永久冻土区的平均温度为0.27°C）。在6月至9月（JJAS）规定的降雨量比历史值增加25%的模拟中也出现了类似的湿润和随之而来的变暖模式，这一增加水平与预测的未来降雨量增加相称。湿润反应对t有很强的敏感性。
AbstractAt high latitudes, changes in soil moisture could alter soil temperatures independently of air temperature changes by interacting with the snow thermal rectifier. The authors investigated this mechanism with model experiments in the Community Land Model 4 (CLM4) with prescribed atmospheric forcing and vegetation state. Under equilibrium historical conditions, increasing CO2 concentrations experienced by plants from 285 to 857 ppm caused local increases in soil water-filled pore space of 0.1–0.2 in some regions throughout the globe. In permafrost regions that experienced this moistening, vertical- and annual- mean soil temperatures increased by up to 3°C (0.27°C averaged over all permafrost areas). A similar pattern of moistening and consequent warming occurred in simulations with prescribed June–September (JJAS) rainfall increases of 25% over historical values, a level of increase commensurate with projected future rainfall increases. There was a strong sensitivity of the moistening responses to t...