ZHANG Xiangjian,LI Jinjian.Spatial and Temporal Variations of Winter Accumulation of Snow over Tibet Plateau and its Surrounding Areas in the Last 45 Years[J].Journal of Chengdu University of Information Technology,2021,36(04):460-466.[doi:10.16836/j.cnki.jcuit.2021.04.016]
近45年青藏高原及周边地区冬半年积雪时空演变特征
- Title:
- Spatial and Temporal Variations of Winter Accumulation of Snow over Tibet Plateau and its Surrounding Areas in the Last 45 Years
- 文章编号:
- 2096-1618(2021)04-0460-07
- Keywords:
- climatology; tibetan Plateau climatology; winter snow; temporal and spatial features; periodic variation; abruptchange
- 分类号:
- P468.0+25
- 文献标志码:
- A
- 摘要:
- 为更好揭示近年来青藏高原及周边地区不同区域冬半年积雪的时空变化特征,利用115个青藏高原气象站日积雪观测数据,采用经验正交函数法(EOF)、旋转经验正交函数法(REOF)、小波分析等方法,得到青藏高原地区积雪深度的时空分布特征及各区的周期振荡和突变特征。主要结果有:青藏高原地区积雪的空间分布不均,东西部存在显著差异; 高海拔地区的积雪深度和年际变化率普遍大于相对低海拔地区。EOF第一模态呈现东北-西南反位相分布,第二模态自北向南呈现“少-多-少-多-少”多极子态分布。将青藏高原地区分为8个积雪气候区,各个气候区存在比较明显的周期及突变特征差异,其中青海东北部区和柴达木盆地区具有较为一致的积雪周期变化特征; 而高原东部区在1987年发生了由少到多、1998年发生了由多到少的显著突变,其他区域的突变现象并不显著。
- Abstract:
- Based on daily snow depth observation data derived from 115 meteorological stations in the Qinghai-Tibet Plateau(QTP)and its surrounding areas in recent years, the spatial and temporal distribution characteristics of snow cover depth in the QTP, as well as the periodic oscillation and mutation of each of regions, were analyzed by empirical orthogonal function(EOF),rotational empirical orthogonal function(REOF), wavelet analysis and mutation test. The results showed that spatial distribution of snow cover in the TPQ is uneven and there were significant differences between the east and the west, and the snow depth and annual change rate in high altitude areas were generally higher than those in low altitude areas. Secondly, the first mode of EOF presents a northeast-southwest distribution, while the second mode presents a "less-more-less-more-less" multipole distribution from north to south. Thirdly, the QTP could be divided into 8 subregions of the climate ofsnow accumulation, and each of regions have different characteristics of snow cover change. The Morlet wavelet analysis manifested that the characteristics of snow cover periodic variation of average winter half-year snow cover depth in the northeastern Qinghai is relatively consistent with that in Qaidam Basin. Mutation test indicated that significant mutations occurred in 1987 and 1998 in the eastern plateau region, according to change in snow cover depth from less to more and from more to less respectively, while the mutation phenomena were not significant in the other regions.
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备注/Memo
收稿日期:2020-08-05
基金项目:第二次青藏高原综合科学考察研究国家专项资助项目(2019QZKK0103)