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A comparative assessment of climate change impacts on drought over Korea based on multiple climate projections and multiple drought indices

  • Moon-Hwan Lee
  • Eun-Soon ImEmail author
  • Deg-Hyo BaeEmail author
Article

Abstract

This study assesses future changes in drought characteristics in response to different emission scenarios over Korea based on multiple climate projections and multiple drought indices. To better resolve regional climate details and enhance confidence in future changes, multi-model projections are dynamically downscaled, and their systematic biases are statistically removed. Bias-corrected climate data are directly used to calculate the standardized precipitation index (SPI) and standardized precipitation evapotranspiration index (SPEI), and they are fed into a hydrological model to generate runoff used for the calculation of the standardized runoff index (SRI). The analysis is focused on changes in the frequencies and severities of severe or extreme droughts measured by the SPI, SPEI, and SRI for the Han River and Nakdong River basins. Fine-scale ensemble projections reveal robust changes in temperatures that monotonically respond to emission forcings, whereas precipitation changes show rather inconsistent patterns across models and scenarios. Temperature and precipitation shifts lead to changes in evapotranspiration (ET) and runoff, which modulate the drought characteristics. In general, the SPEI shows the most robust pattern with significant increases in both drought frequency and severity. This result is mainly due to the excessive potential ET that is hypothetically estimated without considering water availability. While the SPI based on only precipitation exhibits behavior different from that of the SPEI, the SRI that considers actual ET produces an intermediate level of changes between the SPI and SPEI. Compared to the large uncertainty of the frequency changes that overwhelm the change signal due to inconsistency across models and indices, the severity of future drought is likely to be exacerbated with enhanced confidence.

Keywords

Drought projection Multi-model ensemble Korean river basin Dynamical downscaling Standardized drought index 

Notes

Acknowledgements

This research is supported by the Korea Agency for Infrastructure Technology Advancement (KAIA) grant funded by the Ministry of Land, Infrastructure, and Transport (Grant 18AWMP-B083066-05). We thank Prof. Joong-Bae Ahn and Mr. Yeon-Woo Choi at Pusan National University for providing WRF projections driven by HadGEM2-AO. We also extend our thanks to Prof. Myoung-Seok Suh and Dr. Seok-Geun Oh at Kongju National University for providing the RegCM4 projections driven by HadGEM2-AO.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Civil and Environmental EngineeringThe Hong Kong University of Science and TechnologyKowloonChina
  2. 2.Division of Environment and SustainabilityThe Hong Kong University of Science and TechnologyKowloonChina
  3. 3.Department of Civil and Environmental EngineeringSejong UniversitySeoulSouth Korea

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