Editorial Type:
Article
Article Type:
Research Article

Nearest Neighbor–Genetic Algorithm for Downscaling of Climate Change Data from GCMs

Soojun Kim Columbia Water Center, Columbia University, New York, New York

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Jaewon Kwak Forecast and Control Division, Nakdong River Flood Control Office, Busan, South Korea

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Hung Soo Kim Department of Civil Engineering, Inha University, Incheon, South Korea

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Younghun Jung Institute of Environmental Research, Kangwon National University, Chuncheon, Gangwon, South Korea

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Gilho Kim Water Resources Research Division, Korea Institute of Civil Engineering and Building Technology, Goyang, Gyeonggi, South Korea

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Print Publication:
01 Mar 2016
DOI:
https://doi.org/10.1175/JAMC-D-15-0100.1
Page(s):
773–789
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Abstract

The spatial and temporal resolution of readily available climate change projections from general circulation models (GCM) has limited applicability. Consequently, several downscaling methods have been developed. These methods predominantly focus on a single meteorological series at specific sites. Spatial and temporal correlation of the precipitation and temperature fields is important for hydrologic applications. This research uses a nearest neighbor–genetic algorithm (NN–GA) method to analyze the Namhan River basin in the Korean Peninsula. Using the simulation results of the CNRM-CM for the RCP 8.5 climate change scenario, archived in the fifth phase of the Coupled Model Intercomparison Project (CMIP5), the GCM projections are downscaled through the NN–GA. The NN–GA simulations reproduce the features of the observed series in terms of site statistics as well as across variables and sites.

Current affiliation: K-water Institute, Yuseong-gu, Daejeon, South Korea.

Corresponding author address: Hung Soo Kim, Department of Civil Engineering, Inha University, Yonghyun-Dong, Nam-gu, Inchon 402-751, South Korea. E-mail: sookim@inha.ac.kr.

Abstract

The spatial and temporal resolution of readily available climate change projections from general circulation models (GCM) has limited applicability. Consequently, several downscaling methods have been developed. These methods predominantly focus on a single meteorological series at specific sites. Spatial and temporal correlation of the precipitation and temperature fields is important for hydrologic applications. This research uses a nearest neighbor–genetic algorithm (NN–GA) method to analyze the Namhan River basin in the Korean Peninsula. Using the simulation results of the CNRM-CM for the RCP 8.5 climate change scenario, archived in the fifth phase of the Coupled Model Intercomparison Project (CMIP5), the GCM projections are downscaled through the NN–GA. The NN–GA simulations reproduce the features of the observed series in terms of site statistics as well as across variables and sites.

Current affiliation: K-water Institute, Yuseong-gu, Daejeon, South Korea.

Corresponding author address: Hung Soo Kim, Department of Civil Engineering, Inha University, Yonghyun-Dong, Nam-gu, Inchon 402-751, South Korea. E-mail: sookim@inha.ac.kr.
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