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1 Trend and Year-to-year Variability of Land-Surface Air Temperature and Land-only Precipitation Simulated by the JMA AGCM By Shoji KUSUNOKI, Keiichi MATSUMARU, Toshiyuki NAKAEGAWA, and Osamu ARAKAWA Climate Research Department Meteorological Research Institute Japan Meteorological Agency
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2 Contents 1.Purpose 2.Model 3. Experimental design 4. Results 5. Summary
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3 Purpose Evaluate model’s reproducibility 1. Focus ● Trend ● Year-to-year variability 2. Target physical variable ● Land surface temperature ● Land-only precipitation
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4 Model : MJ98 Resolution: T42, 270 km grid spacing, 30 levels, 0.4 hPa top Radiation: Shibata et al. (1999) Deep convection: Prognostic of Arakawa- Schubert, Randal and Pan (1993) Land surface: Simple Biosphere (SiB) model, Sato et al. (1989) Vertical diffusion: Mellor and Yamada (1974), level 2 closure Gravity wave drug: Iwasaki et al. (1989)
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5 Experimental Design SST=OBS, CO2=OBS 1872 1949 1951 2001 1872 2001 Standard Run: 6 members CO2 Const Run: 6 members 1951-2001 Run: 6 members SST=OBS CO2= 285 ppmv SST=OBS CO2=OBS
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6 Standard Run External forcing Sea Surface Temperature: HadISST1.1 Sea Ice: HadISST1.0 CO2: GISS data by Hansen et al. (2002) N2O=306 ppbv, CH4=1650 ppbv by AMIP2 NO sulfates, Solar constant unchanged NO ozone depletion Ensemble size: 6 Target period: 1872-2001, 130 years
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7 Sea Surface Temperature (SST), Global mean, Annual mean Anomaly from 1961-1990 climatology YEAR 1872 2001
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8 CO2 Concentration 288 370 1872 2001 285 1949 Standard run CO2 285 ppm run
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9 Observational Data for Verification Land surface temperature Source: Jones et al. (2001) Target period: 1872~2001 Resolution: Monthly, 5 degree grid Precipitation, Land only Source: Hulme et al. (1998) Target period: 1901~1997 Resolution: Monthly, 5 degree grid http://www.cru.uea.ac.uk/cru/data/
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10 Land Surface Air Temperature Global, Annual, Anomaly from 1961-1990 climatology OBSERVATION YEAR 1872 2001 Each Model Run
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11 Land Surface Air Temperature Global, Annual, Linear Trend OBSERVATION MODEL Ensemble Average YEAR 1872 2001
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12 Land surface Air Temperature, Global Linear trend (C/Century) OBS Ann Spr Sum Aut Win MODEL
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13 Annual Trend (C/Century) OBS Model 1872-2001
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14 Land Surface Air Temperature Global, Annual, Anomaly from 1961-1990 climatology OBSERVATION YEAR 1872 2001 Each Model Run 1910 1945 1975
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15 Annual Trend (C/Century) OBS Model 1910-1945
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16 Annual Trend (C/Century) OBS Model 1946-1975
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17 Annual Trend (C/Century) OBS Model 1976-2001
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18 Land Surface Air Temperature Global, Annual, Linear Trend OBSERVATION MODEL Ensemble Average YEAR 1872 2001
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19 Land surface Temperature, Temporal correlation coefficient (%) between observation and model Annual, 1905-2001, Detrended
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20 Land surface Temperature, Temporal correlation coefficient (%) between observation and model Summer (JJA), 1905-2001, Detrended
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21 Land surface Temperature, Temporal correlation coefficient (%) between observation and model Winter (DJF), 1905-2001, Detrended
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22 Land Surface Air Temperature Global, Annual, Linear Trend MODEL Ensemble Average YEAR 1872-1891 1982-2001
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23 Model, Zonal Average
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