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A Comparative Study of Temperature and Precipitation-Based Aridity Indices and Their Trends in Mongolia

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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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Authors and Affiliations

  1. Division for Desertification Studies, Institute of Geography and Geoecology, Mongolian Academy of Sciences, Baruun Selbe 15, Ulaanbaatar, 15170, Mongolia

    Mandakh Nyamtseren

  2. Key Laboratory of Ecohydrology of Inland River Basin, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Donggang West Rd 320, Lanzhou, 730000, Gansu, China

    Qi Feng

  3. International Centre for Applied Climate Sciences, Institute of Agriculture and the Environment, School of Agricultural, Computational and Environmental Sciences, University of Southern Queensland, Springfield, QLD, 4300, Australia

    Ravinesh Deo

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  1. Mandakh Nyamtseren
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  2. Qi Feng
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  3. Ravinesh Deo
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Correspondence to Mandakh Nyamtseren.

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Nyamtseren, M., Feng, Q. & Deo, R. A Comparative Study of Temperature and Precipitation-Based Aridity Indices and Their Trends in Mongolia. Int J Environ Res 12, 887–899 (2018). https://doi.org/10.1007/s41742-018-0143-6

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  • DOI: https://doi.org/10.1007/s41742-018-0143-6

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