Abstract
Despite evidence from numerous studies that over-reliance on a single General Circulation Model (GCM) could lead to inappropriate predictions or adaptation responses to climate change, single GCMs are still used in most mesoscale impact assessments. The objective of this article was to analyze the uncertainty associated with the use of multiple GCMs on future climate change impact assessments on the paddy irrigation water requirements in the Geumho river basin, Korea. Climate projections were extracted for 13 GCMs from the Intergovernmental Panel on Climate Change (IPCC) for A2, A1B, and B1 scenarios, downscaled using the change factor method and were then analyzed. The Food and Agricultural Organization CROPWAT model was used to calculate the paddy irrigation water requirements. Reference evapotranspiration and the crop water requirements were predicted to increase in future periods (2030s, 2055s, and 2090s). Rainfall predictions from the different GCMs exhibited high variability. The projected mean (range) of the paddy irrigation water requirement increase was 1.1% (−9 to 15%), 2.4% (−9 to 13%), and 7.9% (−4 to 24%) for the 2030s, 2055s, and 2090s, respectively, compared to the baseline values (1975s). The predicted irrigation water requirements for the future were shown to have a relative standard deviation of up to 7.1%. Regression analysis was performed on the trends of predicted water requirement over time using the coefficient of determination. It was concluded that multiple models should be used where possible to avoid inappropriate planning or adaptation responses particularly in the short term. Adaptation strategies are required to mitigate the future impact of increasing future water demand.
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References
Allen MR, Stott PA, Mitchell JFB, Schnur R, Delworth TL (2000) Quantifying the uncertainty in forecasts of anthropogenic climate change. Nature 407:617–620
Bae DH, Jung W, Lettenmaier DP (2011) Hydrologic uncertainties in climate change from IPCC AR4 GCM simulations of the Chungju Basin. Korean J Hydrol 401:90–105
Chung SO (2009) Climate change impacts on paddy irrigation water requirement in the Nakdong river basin. J Korean Soc Agric Eng 51(2):35–41 (in Korean)
Chung SO (2011) Projecting future paddy irrigation demands in Korea using high-resolutions climate simulations. J Korea Water Resour Assoc 44(3):169–177
Chung SO, Rodriguez-Diaz JA, Weatherhead EK, Knox JW (2011) Climate change impacts on water for irrigating paddy rice in South Korea. Irrig Drain 60(2):263–273
Cox P, Stephenson D (2007) A changing climate for prediction. Science 317:207–208
Diaz-Nieto J, Wilby R (2005) A comparison of statistical downscaling and climate change factor methods: impacts on low flows in the river Thames, United Kingdom. Clim Change 69:245–268
Elgaali E, Garcia LA, Ojima DS (2007) High resolution modeling of the regional impacts of climate change on irrigation water demand. Clim Change 84:441–461
Giorgi F, Mearns L (2002) Calculation of average, uncertainty range, and reliability of regional climate changes from AOGCM simulations via the ‘‘reliability ensemble averaging’’ (REA) method. J Clim 15:1141–1158
Im ES, Jung IW, Chang H, Bae DH, Kwon WT (2010) Hydroclimatological response to dynamically downscaled climate change simulations for Korean basins. Clim Change 100:485–508
Intergovernmental Panel on Climate Change (IPCC) (2007) Data distribution centre. http://www.ipcc-data.org accessed on 4 Jan. 2011
Kim JC, Kim SD (2007) A study on characteristics of Geumho river basin runoff as urbanization. In: Proceedings of the Korean society of water environment and the Korean society of water and wastewater joint spring conference, pp 928–936 (in Korean)
Kim MJ JO, Shin LeeHS, Kwon WT (2008) An uncertainty assessment of AOGCM and future projection over East Asia. Atmosphere 18(4):507–524 (in Korean)
Liu TM, Tung CP, Ke KY, Chuang LH, Lin CY (2009) Application and development of a decision-support system for assessing water shortage and allocation with climate change. Paddy Water Environ 7:301–311
Ministry for Food, Agriculture, Forestry and Fisheries, Korea (MFAFF) (2011) Statistical yearbook of crop production (in Korean)
New M, Lister D, Hulme M, Makin I (2002) A high resolution data set of surface climate over general land areas. Clim Res 21:1–25
Park GA, Shin HJ, Lee MS, Hong WY, Kim SJ (2009) Future potential impacts of climate change on agricultural watershed hydrology and the adaptation strategy of paddy rice irrigation reservoir by release control. Paddy Water Environ 7:271–282
Randall DA, Wood RA, Bony S, Colman R, Fichefet T, Fyfe J, Kattsov V, Pitman A, Shukla J, Srinivasan J, Stouffer RJ, Sumi A, Taylor KE (2007) Climate models and their evaluation. In: Climate change 2007: the physical scientific basis. Contribution of Working Group I to the fourth assessment report of the intergovernmental panel on climate change. Cambridge University Press, Cambridge
Shahid S (2011) Impact of climate change on irrigation water demand of dry season Boro rice in northwest Bangladesh. Clim Change 105:433–453
Smith M (1992) CROPWAT: a computer program for irrigation planning and management. FAO irrigation and drainage paper No. 46
Stainforth DA, Aina T, Christensen C, Collins M, Faull N, Frame DJ, Kettleborough JA, Knight S, Martin A, Murphy JM, Piani C, Sexton D, Smith LA, Spicer RA, Thorpe AJ, Allen MR (2005) Uncertainty in predictions of the climate response to rising levels of greenhouse gases. Nature 433:403–406
Tebaldi C, Smith RL, Nychka D, Mearns LO (2005) Quantifying uncertainty in projections of regional climate change: A Bayesian approach to the analysis of multimodel ensembles. J Clim Am Met Soc 18:1524–1540
Watanabe T, Kume T (2009) A general adaptation strategy for climate change impacts on paddy cultivation: special reference to the Japanese context. Paddy Water Environ 7:313–320
Wilby RL, Charles SP, Zorita E, Timbal B, Whetton P, Mearns LO (2004) Guidelines for use of climate scenarios developed from statistical downscaling methods. http:/www.ipcc-data.org/guidelines/dgm_no2_v1_2004.pdf. Accessed on 3 March 2011
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This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (No. 2010-0007884).
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Chung, SO., Nkomozepi, T. Uncertainty of paddy irrigation requirement estimated from climate change projections in the Geumho river basin, Korea. Paddy Water Environ 10, 175–185 (2012). https://doi.org/10.1007/s10333-011-0305-z
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DOI: https://doi.org/10.1007/s10333-011-0305-z