大连地区冻土特征及影响因素

Permafrost Features and Influence Factors in Dalian Area

利用大连地区近10年的冻土观测资料和地面温度资料,分析了大连地区最大冻土深度、冻结日期、解冻日期及冻土持续时间的变化特征和空间分布特征,并讨论大连地区冻土的影响因素。结果表明:近10年来,大连地区的土壤冻结深度具有厚、薄、厚的变化特点;大连地区的冻土具有明显的季节性变化特点;从整体上来看,大连地区的土壤冻结日期及完全解冻日期呈推迟的趋势,且土壤完全解冻日期的推迟幅度大于冻结日期的推迟幅度;大连地区冻土的持续时间呈增加的趋势且大连地区冻土的持续时间年变化幅度很大。大连地区最大冻土深度与大连地区冬季的地面温度两者间的变化趋势完全相反,大连地区土壤的最大冻结深度随着纬度的增加而逐渐加深。

Using the data of Dalian area nearly 10 years of frozen soil observations and ground temperature to analyzed the maximum depth of frozen soil of Dalian,the date of freeze and thaw,the change characteristics and spatial distribution characteristics of frozen soil duration, and discussed the influence factors of frozen soil of Dalian region.The results showed that the last 10 years ,the depth of Dalian soil freezing changes along with thick, thin, thick.The frozen soil of Dalian region had obvious seasonal changes.On the whole,the starting and ending date of frozen soil was both postponed trend, and the postponed amplitude of completely thawed date was larger than the postponed amplitude of frozen date.The duration of Dalian permafrost was increasing and the annual variation of duration of permafrost was large.In Dalian area,the trend of changes of maximum depth of frozen soil was contrary to ground temperature in winter, the maximum depth of frozen soil was increasing with the latitude gradually deepened.