Spatiotemporal Variations of Drought in Inner Mongolia over the Past 50 years Based on SPEI

DOI

10.2991/rac-16.2016.126How to use a DOI?

Keywords

Standardized Precipitation Evapotranspiration Index; drought; spatial-temporal variation; Inner Mongolia

Abstract

The Standardized Precipitation Evapotran- spiration Index (SPEI) was used as the indicator of drought, calculating the monthly precipitation and monthly mean temperature among the 109 weather stations in Inner Mongolia from 1961 to 2010 to obtain the SPEI value of each site at the time scale of 12 month. Then according to the temporal and spatial change trend of SPEI, spatial distribution and drought occurrence frequencies, this paper analyzed the spatial-temporal variation characteristics of drought in Inner Mongolia. The results showed that: 1)over the past 50 years in Inner Mongolia the drought is decreasing at a rate of 0.22/10a, becoming more and more dryer, the occurrence of different grades of drought has increased, and most prominent in early twenty-first century. 2) There was a clear mutation in 1998 and after this year the occurrence frequency of extreme drought and severe drought increased, showing that the drought in Inner Mongolia is exacerbated since the 1998. 3) There is significant regional differences of drought interannual variability in spatial distribution from 1961 to 2010, in short, the drought degree in east of Inner Mongolia is higher than that of west in study area. 4) During 1961 to 2010 the SPEI in Inner Mongolia has a different degree of reducing trend, which means that the whole area of the region tends to be dry since the 60's.

Copyright

© 2016, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Siqin Tong
AU  - Jiquan Zhang
AU  - Quan Lai
AU  - Rina Wu
PY  - 2016/11
DA  - 2016/11
TI  - Spatiotemporal Variations of Drought in Inner Mongolia over the Past 50 years Based on SPEI
BT  - Proceedings of the 7th Annual Meeting of Risk Analysis Council of China Association for Disaster Prevention
PB  - Atlantis Press
SP  - 781
EP  - 786
SN  - 1951-6851
UR  - https://doi.org/10.2991/rac-16.2016.126
DO  - 10.2991/rac-16.2016.126
ID  - Tong2016/11
ER  -