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利用CAMP/Tibet在藏北高原D105点所观测的2002年1月1日—2005年12月31日土壤温度、含水量资料,分析了该点的土壤温、湿度变化及其冻融特征.结果表明:D105点40cm深度以上土壤温度日变化明显,随着深度增加,土壤温度日变化相位明显滞后.各层土壤温度月最高值出现在8—9月,月最低值都出现在1—2月;年际气候的差异至少可以反映到185cm深处的土壤.土壤冻结和消融都是由表层开始,土壤随深度增加冻结快,消融则慢.冻结期间,土壤温度分布上部低,下部高;消融期间,则分布相反.60cm深度以上的土壤含水量在消融期有显著的波动,表明60cm深度以上的土壤与大气之间的水热交换比较频繁.土壤温度的日变化和平均温度对土壤的冻融过程有较大的影响;土壤含水量的多少会极大的影响土壤的冻融过程、土壤热量的分布状况以及地表能量的分配.因此水(湿度)热(温度)相互耦合影响着土壤的冻融过程.
Based on the data of soil temperature and water content measured at D105 on Cangbai Plateau from January 1, 2002 to December 31, 2005 by CAMP / Tibet, the changes of soil temperature and humidity and their freeze-thaw characteristics were analyzed. The results showed that the diurnal variation of soil temperature was obvious at the depth of 40cm above D105, with the depth increasing, the phase of diurnal variation of soil temperature lagged obviously.The monthly maximum of soil temperature in each layer occurred in August to September, and the monthly minimum appeared in January to February The difference of annual climate can be at least reflected to the depth of 185cm. Soil freezing and thawing are all started from the surface layer, the soil freezing fast with increasing depth, and the ablation is slow. During freezing, the upper soil temperature distribution is low and the lower is high. During the period of 60cm depth, the soil water content fluctuated significantly during the ablation period, indicating that the water-heat exchange between the soil and the atmosphere above the depth of 60cm occurred more frequently. The diurnal variation of the soil temperature and the average temperature affected the soil freezing Melting process has a greater impact; the amount of soil moisture will greatly affect the soil freezing and thawing process, soil heat distribution and surface energy distribution. Therefore, water (humidity) heat (temperature) mutual coupling Soil freezing and thawing process.