Abstract
Climate change information required for impact studies is of a much finer scale than that provided by Global circulation models (GCMs). This paper presents an application of partial least squares (PLS) regression for downscaling GCMs output. Statistical downscaling models were developed using PLS regression for simultaneous downscaling of mean monthly maximum and minimum temperatures (T max and T min) as well as pan evaporation to lake-basin scale in an arid region in India. The data used for evaluation were extracted from the NCEP/NCAR reanalysis dataset for the period 1948–2000 and the simulations from the third-generation Canadian Coupled Global Climate Model (CGCM3) for emission scenarios A1B, A2, B1, and COMMIT for the period 2001–2100. A simple multiplicative shift was used for correcting predictand values. The results demonstrated that the downscaling method was able to capture the relationship between the premises and the response. The analysis of downscaling models reveals that (1) the correlation coefficient for downscaled versus observed mean maximum temperature, mean minimum temperature, and pan evaporation was 0.94, 0.96, and 0.89, respectively; (2) an increasing trend is observed for T max and T min for A1B, A2, and B1 scenarios, whereas no trend is discerned with the COMMIT scenario; and (3) there was no trend observed in pan evaporation. In COMMIT scenario, atmospheric CO2 concentrations are held at year 2000 levels. Furthermore, a comparison with neural network technique shows the efficiency of PLS regression method.
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Appendix
Appendix
Abbreviations used in text
CCCma: Canadian Center for Climate Modeling and Analysis
CGCM: Canadian Coupled Global Climate Model
CGCM3: Third-generation Canadian Global Climate Model
GCM: Global Climate Model
IPCC: Intergovernmental panel on climate change
NCAR: National Center for Atmospheric Research, USA
RMSE: Root mean square error
SRES: Special report of emission scenarios
Ta 925: Air temperature at 925 hPa
Ua 925: Zonal wind at 925 hPa
Va 925: Meridional wind at 925 hPa
Ta 950: Air temperature at 500 hPa
Va 500: Meridional wind at 500 hPa
Zg 500: geo-potential height at 500 hPa
Ta 200: Air temperature at 200 hPa
Ua 200: Zonal wind at 200 hPa
Va 200: Meridional wind at 200 hPa
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Goyal, M.K., Ojha, C.S.P. PLS regression-based pan evaporation and minimum–maximum temperature projections for an arid lake basin in India. Theor Appl Climatol 105, 403–415 (2011). https://doi.org/10.1007/s00704-011-0406-z
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DOI: https://doi.org/10.1007/s00704-011-0406-z