冻土发育期不同埋深地温对气温变化响应的监测与分析——以大兴安岭地区松岭区为例

Monitoring and analysis of ground temperature response to temperature change at different burial depths during frozen soil development period:Taking the Songling district of the Daxinganling region as an example

利用黑龙江大学寒区地下水研究所埋设于大兴安岭松岭区水文站内的寒区低温地温自动监测装置和1.5 m百叶箱,选择冻土发育期内实测的地温与气温数据资料,运用双变量分析法监测分析了该研究区内冻土发育期的地温对气温变化的响应关系。结果表明:①近5 d地表日平均气温与不同深度地温的相关系数最大为0.999,不同深度的地温对气温变化的响应具有一定的滞后性,且与过去时间气温的积累温度呈正相关;②50 cm和地表的土壤30 d的两要素相关性相对稳定,无论是进行5、8、11、15步长的滑动,都较为稳定;③气温表现出自相关不明显,滞时1 d后相关系数下降到0.4以下,地表温度负相关系数较高的时间在15 d左右,而其他土壤层温度在20 d左右,尤其是300 cm的土壤温度自相关在18 d左右。

The automatic monitoring device of negative groundtemperature and 1.5 m louvered box buried in the hydrological station of Songling District,Daxinganling,were used to monitor and analyze the response of ground temperature to temperature change during the frozen soil development period in the study area by using the bivariate analysis method of the cold ground water research institute of Heilongjiang University.The results show that:①the correlation coefficient between the average daily surface temperature in the last 5 d and the ground temperature at different depths is the maximum of 0.999,and the response of the ground temperature at different depths to the temperature change has a certain lag,and is positively correlated with the accumulated temperature of the past time temperature;②the correlation between the two elements of the soil at 50 cm and the surface for 30 d is relatively stable,both for 5,8,11,15 steps of sliding,are more stable;③temperature and wet performance of autocorrelation is not obvious,the correlation coefficient dropped to below 0.4 after 1d lag time,the time of negative correlation coefficient of surface temperature is higher in about 15 d,while the temperature of other soil layers in about 20 d,especially the soil temperature of 300 cm autocorrelation in about 18 d.