气候变化领域集成服务门户(CCPortal): A Comparative Study of Temperature and Precipitation-Based Aridity Indices and Their Trends in Mongolia

CCPortal

DOI	10.1007/s41742-018-0143-6
	A Comparative Study of Temperature and Precipitation-Based Aridity Indices and Their Trends in Mongolia
	Nyamtseren, Mandakh; Feng, Qi; Deo, Ravinesh
发表日期	2018
ISSN	1735-6865
EISSN	2008-2304
卷号	12 期号:6
英文摘要	Aridity is a major indicator for defining the area of land that is prone to drought, land degradation, and desertification. The present research explores spatiotemporal variations of aridity using four different equations: (1) de Martonne aridity index (IDM); (2) Thornthwaite aridity index (AI); (3) moisture coefficient by V. I. Mezentsev (MI) and (4) Hydrothermal coefficient by Selyaninov (HTC) over Mongolia based on the primary climatic data from 70 different stations in Mongolia for the last 55 years (1961-2015). Utilizing these data using RegCM4-HadGEM climate change scenario, this study explores how the aridity level is likely to change in the future. The results showed that the total area of drylands (i.e., hyper-arid, arid, semi-arid and sub-humid regions) determined by IDM, MI, AI and HTC is approximately 64.1%, 70.7%, 85%, and 98%, respectively. Out of the four aridity indices considered, the metrics defined by AI and MI showed high correlation with the NDVI derived dryland regions. Time series analysis of AI and MI both showed a decreasing tendency for the period of 1961-2015. In the central and the northeastern regions in Mongolia, significantly decreasing trends in the aridity indices were observed. With respect to the stations with significantly decreasing trends in aridity, the relative changes of the aridity index magnitude varied between 14% and 74%. The aridity index calculated using climate change scenarios also indicated that the aridity level is likely to increase in the twenty-first century in the central part of Mongolia, whilst the extra arid areas will stable. The study has implications for water resources management, agriculture and social and economic life of the people of Mongolia and the other regions globally where aridity presents a significant challenge for decision makers.
关键词	Aridity index Drylands Spatiotemporal trend Relative change
学科领域	Environmental Sciences & Ecology
语种	英语
WOS研究方向	Environmental Sciences
来源期刊	INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/111984
作者单位	Mongolian Acad Sci, Inst Geog & Geoecol, Div Desertificat Studies, Baruun Selbe 15, Ulaanbaatar 15170, Mongolia
推荐引用方式 GB/T 7714	Nyamtseren, Mandakh,Feng, Qi,Deo, Ravinesh. A Comparative Study of Temperature and Precipitation-Based Aridity Indices and Their Trends in Mongolia[J]. 中国科学院西北生态环境资源研究院,2018,12(6).
APA	Nyamtseren, Mandakh,Feng, Qi,&Deo, Ravinesh.(2018).A Comparative Study of Temperature and Precipitation-Based Aridity Indices and Their Trends in Mongolia.INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH,12(6).
MLA	Nyamtseren, Mandakh,et al."A Comparative Study of Temperature and Precipitation-Based Aridity Indices and Their Trends in Mongolia".INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH 12.6(2018).