首页|1961-2020年柴达木盆地霜冻时空变化特征分析

1961-2020年柴达木盆地霜冻时空变化特征分析

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利用青海省柴达木盆地1961-2020年日最低气温资料,结合1978-2020年霜冻次数数据,研究柴达木盆地霜冻发生的时空分布特征.结果表明:柴达木盆地以晚霜冻为主,近60年来,无霜期日数呈现出波动延长的趋势,其气候倾向率为4.5 d·(10a)-1,无霜期平均增长了 14 d;柴达木盆地霜冻日数呈显著减少趋势,气候倾向率为-4.6 d·(10a)-1.从年代际变化特征来看,20世纪60到90年代,霜冻日数长于历年平均日数.突变检验结果显示,柴达木盆地无霜期在1994-1995年间发生突变,霜冻日数在1996-1997年间发生突变;空间分布上,柴达木作物种植区晚霜冻具有东部和西北部发生次数多,中间区域发生次数少的特征;柴达木盆地晚霜冻发生次数周期震荡有一定规律,主要存在10~17年的周期性变化;柴达木盆地晚霜冻发生次数呈现偏多或偏少的一致性特征,也存在明显的东西部差异分布.
Temporal and Spatial Distribution Characteristics of Frost Period in Qaidam Basin from 1961 to 2020
Using daily minimum temperature data from 1961 to 2020 in the Qaidam Basin of Qinghai Province,combined with frost frequency data from 1978 to 2020,this study investigated the spatiotemporal distribution character-istics of frost occurrence in the Qaidam Basin.The results showed that the Qaidam Basin was mainly characterized by late frost,and in the past 60 years,the number of frost free days has shown a fluctuating and prolonged trend,with a climate inclination rate of 4.5 d·(10a)-1.The average frost free period has increased by 14 days;The number of frost days in the Qaidam Basin showed a significant decreasing trend,with a climate inclination rate of-4.6 d·(10a)-1.From the perspective of inter decadal changes,from the 1960s to the 1990s,the number of frost days was longer than the annual average;The mutation test results showed that the frost free period in the Qaidam Basin under-went a sudden change between 1994 and 1995,and the number of frost days underwent a sudden change between 1996 and 1997;In terms of spatial distribution,the late frost in the Qaidam crop planting area had the characteristic of more occurrences in the eastern and northwestern regions,and fewer occurrences in the middle region;The frequency of late frost occurrence in the Qaidam Basin exhibited a certain pattern of periodic oscillation,mainly with a period of 10-17 years;The occurrence of late frost in the Qaidam Basin showed a consistent pattern of more or less occurrences,and there were also significant differences in distribution between the east and west.

FrostSpatiotemporal distributionMutation

戴广婷、庞搏、陈宏松、王力、祁贵明、李耀华

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青海省都兰县气象局,青海 都兰 816199

青海省格尔木市气象局,青海 格尔木 816099

青海省气象干部培训学院,青海 西宁 810000

霜冻 时空分布 突变

2024

青海农林科技
青海省农林科学院 青海省林学会 青海省农学会

青海农林科技

影响因子:0.183
ISSN:1004-9967
年,卷(期):2024.(4)