淮河源浅层地温时空变化及其对全球增暖停滞的响应

Spatial and Temporal Variations of Shallow Ground Temperature in the Huaihe River Source and Its Response to Recent Global Warming Hiatus

利用1961—2017年淮河源地区10个气象站的逐月平均气温和逐月平均0~20 cm地温资料,采用线性回归、功率谱分析等方法,分析了近57年淮河源地区0~20 cm地温的时空变化特征及其对全球增暖停滞的响应。结果表明:(1)1961—2017年淮河源地区0~20 cm各层年平均地温均呈波动上升趋势;(2)淮河源0~20 cm年均地温均呈东部和西南部高、北部和西北部低的空间格局,西南部各层地温变化速率最大,中部地区变化速率最小;(3)淮河源各层年均地温变化均检测出2.29 a的周期信号,信阳、息县、新县、淮滨和商城周期信号较强,其余站点各层年均地温无明显的周期信号;(4)1998—2012年淮河源各层地温对全球增暖停滞的响应极为敏感。

Based on the monthly mean air temperature and shallow ground temperature data at the depth of 0~20 cm from 1961 to 2017 in the Huaihe River Source,the spatial and temporal variation characteristics of 0~20 cm ground temperature in the Huaihe River Source and its response to the global warming hiatus in the past 57 years are analyzed by using linear regression and power spectrum analysis methods.The results show that:(1)During 1961—2007,the annual mean ground temperature of each layer in the Huaihe River Source shows a significant increasing trend.(2)Significant periodicity of 2.29 a is detected in annual mean ground temperature of each layer over the past 57 years,with stronger signals in Xinyang,Xixian,Xinxian,Huaibin and Shangcheng.However,no significant periodic signals are detected in the rest stations.(3)The annual mean ground temperature of each layer at the Huaihe River Source shows a spatial pattern of higher temperatures in the east and southwest,and lower in the north and northwest.The largest warming trend of annual ground temperature is found in the southwestern part of the study area,while the rate in the central region is the smallest.(4)From 1998 to 2012,the ground temperature of each layer in the Huaihe River Source is extremely sensitive to the global warming hiatus.