干旱区生态环境知识资源中心(Arid): Spatial and Temporal Variations of Freezing and Thawing Indices From 1960 to 2020 in Mongolia

Arid

DOI	10.3389/feart.2021.713498
	Spatial and Temporal Variations of Freezing and Thawing Indices From 1960 to 2020 in Mongolia
	Dashtseren, Avirmed; Temuujin, Khurelbaatar; Westermann, Sebastian; Batbold, Altangerel; Amarbayasgalan, Yondon; Battogtokh, Dorjgotov
通讯作者	Dashtseren, A (corresponding author), Mongolian Acad Sci, Inst Geog Geoecol, Ulaanbaatar, Mongolia.
来源期刊	FRONTIERS IN EARTH SCIENCE
EISSN	2296-6463
出版年	2021
卷号	9
英文摘要	Mongolia is one of the most sensitive regions to climate change, located in the transition of several natural and permafrost zones. Long-term trends in air freezing and thawing indices can therefore enhance our understanding of climate change. This study focuses on changes of the spatiotemporal patterns in air freezing and thawing indices over Mongolia from 1960 to 2020, using observations at 30 meteorological stations. Our results shows that the freezing index ranges from -945.5 to -4,793.6 degrees C day, while the thawing index ranges from 1,164.4 to 4,021.3 degrees C day over Mongolia, and their spatial patterns clearly link to the latitude and altitude. During the study period, the trend in the thawing index (14.4 degrees C-day per year) was larger than the trend in the freezing index (up to -10.1 degrees C-day per year), which results in the net increase of air temperature by 2.4 degrees C across Mongolia. Overall, the increase in the thawing index was larger in the low latitudes and altitudes (e.g., the Gobi-desert, steppes, the Great lake depression and major river valleys) than in high latitudes and altitudes (mountain regions), while it was the opposite for the freezing index. The highest values for both thawing index and freezing index (i.e. the least negative values) have occurred during the last 2 decades. As the trends in the freezing and thawing indices and mean annual air temperature confirm intensive climate warming, increased permafrost degradation and shallower seasonally frozen ground are expected throughout Mongolia.
英文关键词	freezing index thawing index transition zones climate warming Mongolia
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000733893200001
WOS关键词	NORTHERN-HEMISPHERE ; ACTIVE-LAYER ; SPATIOTEMPORAL VARIATIONS ; AIR-TEMPERATURE ; PERMAFROST ; CLIMATE ; ASIA
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/373847
作者单位	[Dashtseren, Avirmed; Temuujin, Khurelbaatar; Amarbayasgalan, Yondon; Battogtokh, Dorjgotov] Mongolian Acad Sci, Inst Geog Geoecol, Ulaanbaatar, Mongolia; [Westermann, Sebastian] Univ Oslo, Dept Geosci, Oslo, Norway; [Batbold, Altangerel] Informat & Res Inst Meteorol Hydrol & Environm, Ulaanbaatar, Mongolia
推荐引用方式 GB/T 7714	Dashtseren, Avirmed,Temuujin, Khurelbaatar,Westermann, Sebastian,et al. Spatial and Temporal Variations of Freezing and Thawing Indices From 1960 to 2020 in Mongolia[J],2021,9.
APA	Dashtseren, Avirmed,Temuujin, Khurelbaatar,Westermann, Sebastian,Batbold, Altangerel,Amarbayasgalan, Yondon,&Battogtokh, Dorjgotov.(2021).Spatial and Temporal Variations of Freezing and Thawing Indices From 1960 to 2020 in Mongolia.FRONTIERS IN EARTH SCIENCE,9.
MLA	Dashtseren, Avirmed,et al."Spatial and Temporal Variations of Freezing and Thawing Indices From 1960 to 2020 in Mongolia".FRONTIERS IN EARTH SCIENCE 9(2021).