A comparative study of temperature and precipitation‑based aridity indices and their trends in Mongolia

Nyamtseren, Mandakh and Feng, Qi and Deo, Ravinesh C. (2018) A comparative study of temperature and precipitation‑based aridity indices and their trends in Mongolia. International Journal of Environmental Research. ISSN 1735-686

Abstract

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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published online: 21 September 2018. © University of Tehran 2018.
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Applied Climate Sciences
Date Deposited: 27 Sep 2018 01:17
Last Modified: 13 Jun 2019 05:34
Uncontrolled Keywords: aridity index; drylands; spatiotemporal trend; relative change
Fields of Research : 05 Environmental Sciences > 0502 Environmental Science and Management > 050209 Natural Resource Management
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970105 Expanding Knowledge in the Environmental Sciences
Identification Number or DOI: 10.1007/s41742-018-0143-6
URI: http://eprints.usq.edu.au/id/eprint/34873

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