河西走廊东部冻土初、终日的变化特征分析
发布时间：2018-11-08 15:28
【摘要】：利用1961-2015年河西走廊东部4个气象站点逐日冻土观测资料和地温、气温资料,采用现代气候诊断分析方法,系统分析了河西走廊东部冻土初、终日的时空变化特征以及冻土初、终日与地、气温和海拔高度的关系。结果表明:受海拔高度、地形地势以及植被覆盖情况的影响,在空间变化上,冻土初日为山区早于荒漠区早于绿洲平原区,冻土终日为山区晚于荒漠区晚于绿洲平原区。在时间变化上,冻土初日呈推迟趋势,冻土终日呈提早趋势,民勤冻土初日推迟趋势和终日提早的趋势尤为明显。冻土初、终日时间序列均分别存在着6~7a、4~6a的准周期变化。冻土初、终日与地、气温和海拔高度具有极显著相关性,地、气温每升高1℃,冻土初日分别推迟约2.1d、2.2d,冻土终日分别提早约4.9d、5.2d,海拔每升高100m,冻土初日提早约1.8d,冻土终日推迟约2.3d。了解河西走廊东部冻土初、终日的变化特征,对研究区域气候变化、指导各行业安全生产和促进地方经济发展等具有重要意义。
[Abstract]:Based on the daily frozen soil observation data, ground temperature and temperature data of 4 meteorological stations in the eastern part of Hexi Corridor from 1961 to 2015, the preliminary frozen soil in the eastern part of Hexi Corridor was systematically analyzed by using modern climate diagnosis and analysis method. The temporal and spatial characteristics of the whole day and the relationship between the initial frozen soil, the whole day and the ground, air temperature and altitude. The results show that, influenced by altitude, topography and vegetation coverage, the first day of frozen soil is earlier in mountain area than in desert area than in oasis plain area, and the whole day is later in mountain area than in desert area. In terms of time change, the first day of frozen soil was delayed, and the whole day of frozen soil showed an early trend, especially in Minqin permafrost, especially in the trend of delaying the first day of frozen soil and advancing the whole day. At the beginning of permafrost, there is a quasi-periodic variation of 6 ~ 7a ~ (4) a ~ (4) a ~ (6) a in the whole day time series. At the beginning of frozen soil, the whole day has a very significant correlation with the ground, air temperature and altitude. For each temperature rise of 1 鈩，
本文编号：2318893
[Abstract]:Based on the daily frozen soil observation data, ground temperature and temperature data of 4 meteorological stations in the eastern part of Hexi Corridor from 1961 to 2015, the preliminary frozen soil in the eastern part of Hexi Corridor was systematically analyzed by using modern climate diagnosis and analysis method. The temporal and spatial characteristics of the whole day and the relationship between the initial frozen soil, the whole day and the ground, air temperature and altitude. The results show that, influenced by altitude, topography and vegetation coverage, the first day of frozen soil is earlier in mountain area than in desert area than in oasis plain area, and the whole day is later in mountain area than in desert area. In terms of time change, the first day of frozen soil was delayed, and the whole day of frozen soil showed an early trend, especially in Minqin permafrost, especially in the trend of delaying the first day of frozen soil and advancing the whole day. At the beginning of permafrost, there is a quasi-periodic variation of 6 ~ 7a ~ (4) a ~ (4) a ~ (6) a in the whole day time series. At the beginning of frozen soil, the whole day has a very significant correlation with the ground, air temperature and altitude. For each temperature rise of 1 鈩，
本文编号：2318893
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