Preprint Article Version 1 NOT YET PEER-REVIEWED

Analysis of Drought Characteristics using Time Series of Modified SPEI in South Korea from 1981 to 2010

1
Institute of Green Bio Science Technology, Seoul National University, Pyeongchang, Republic of Korea
2
Biological and Agricultural Engineering, Texas A&M University, College station, Texas, USA
3
Department of Rural and Bio-Systems Engineering, Chonnam National University, Gwangju, Republic of Korea
4
Institute on the Environment, University of Minnesota, Saint Paul, Minnesota, USA
Version 1 : Received: 6 October 2016 / Approved: 6 October 2016 / Online: 6 October 2016 (13:04:49 CEST)

How to cite: Bae, S.; Lee, S.; Yoo, S.; Kim, T. Analysis of Drought Characteristics using Time Series of Modified SPEI in South Korea from 1981 to 2010. Preprints 2016, 2016100013 (doi: 10.20944/preprints201610.0013.v1). Bae, S.; Lee, S.; Yoo, S.; Kim, T. Analysis of Drought Characteristics using Time Series of Modified SPEI in South Korea from 1981 to 2010. Preprints 2016, 2016100013 (doi: 10.20944/preprints201610.0013.v1).

Abstract

The aim of this study is to analyze the characteristics of drought such as intensity, cumulative curves and trends, based on SPEI (Standardized Precipitation Evapotranspiration Index) at 8 stations in Korea from 1981 to 2010. The traditional SPEI is based on Thornthwaite equation for estimating evapotranspiration; SPEI_th. However, a standard of agricultural water management in Korea suggests FAO Penman-Monteith equation; SPEI_pm. In this study, we analyzed the intensity and trends of drought using SPEI_th and SPEI_pm, respectively, and analyzed the relationship between them. Both of central and southern region, the SPEIs were below -1.0 (moderated drought) for the periods May-August in the representative drought year such as 1988, 2001, and 2008-09. The frequency of drought was higher in southern region than central region. In addition, SPEI_pm showed slightly more intensive drought rather than SPEI_th except for Chuncheon and Gwangju. In 5 stations except for Cheoncheon, Gwangju and Jinju, the cumulative probability that SPEI_pm is below -1.5 was significantly increased from 1981-1995 to 1996-2010. As the results of drought trends, the increasing trend of SPEIs was shown on fall season, and the cumulative probability that SPEI_pm is below -1.5 was also significantly increased.

Subject Areas

drought; SPEI; evapotranspiration; Thornthwaite; FAO Penman-Monteith

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