摘要
利用1990~2022年玉树地区5个观测站的冻土深度、地温、气温、气温日较差、积雪日数、降水和日照等观测资料,采用现代气候诊断分析方法,对冻土特征及其变化进行了分析。结果表明,近33a来:(1)各站年平均气温呈明显的上升趋势;(2)冻土开始结冻日期杂多最早,依次为杂多、治多、曲麻莱、玉树、囊谦;完全消融日期囊谦最早,依次为囊谦、玉树、杂多、治多、曲麻莱;年冻土深度从深到浅依次为曲麻莱、治多、杂多、玉树、囊谦,与年平均气温从低到高的次序一致;(3)冻土呈退化趋势;(4)影响冻土的主要气象因子为气温、气温日较差、地温、积雪日数;(5)冻土不同时期降水量、日照与地温相关性比较复杂,对冻土的冻结与消融的影响,存在时间与地域的差异。
Based on the observation data of permafrost depth,ground temperature,air temperature,diurnal temperature range,days with snow cover,precipitation and sunshine from five observation stations in Yushuarea from 1990 to 2022,the characteristics and changes of frozen soil were analyzed by modern climate diagnosis andanalysis method.The results show that:(1)the annualmean temperature of each stationhas an obvious rising trend in the past 33 years;(2)Frozen soil began to freeze the earliest date,in order to Zaduo,Zhiduo,Qumalai,Yushu,capsule qian;The date of completeablation was cystic Qian,followed by cystic Qian,Yushu,Zadoduo,Zhiduo and Qumalai.The annual frozen soil depth from deep to shallow in order to Qumalai,Zhiduo,Zaduo,Yushu,nangqian,and the annual average temperature from low to high order is consistent;(3)The frozen soil tends to degrade;(4)Themainmeteorological factors affecting frozen soil are air temperature,daily temperature range,ground temperature and days with snow cover.(5)The correlation between precipitation,sunshine and ground temperature in different periods of frozen soil is complex,and the influence on freezing and thawing of frozen soil varies with time and region.
作者
山发梅
张得香
玉红英
SHAN Fa-mei(Tam Giang Source sub-center for eco-meteorology,Yushu Qinghai 815099,China)
出处
《青海草业》
2023年第2期65-72,共8页
Qinghai Prataculture
关键词
玉树地区
气候变化
冻土特征
影响
Yushu district
Climate change
Characteristics of frozen soil
Impact
