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Chemistry-Climate Interaction Studies in Japan

Chemistry Climate Interactions Workshop, Santa Fe, February 10-12, 2003. Chemistry-Climate Interaction Studies in Japan. Hajime Akimoto Atmospheric Composition Research Program Frontier Research System for Global Change. Present Status of Chemistry-Climate Research in Japan.

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Chemistry-Climate Interaction Studies in Japan

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  1. Chemistry Climate Interactions Workshop, Santa Fe, February 10-12, 2003 Chemistry-Climate Interaction Studies in Japan Hajime Akimoto Atmospheric Composition Research Program Frontier Research System for Global Change

  2. Present Status of Chemistry-Climate Research in Japan Only one AGCM-Based Chemical Transport Model “CHASER” = CCSR/NIES AGCM + Tropospheric Chemistry (gas Phase) Development of CHASER CCSR: Center for Climate System Research, UT RCAST: Research Center for Advanced Science and Technology, UTFRSGC: Frontier Research System for Global Change Model Description and validation Sudo, K., M. Takahashi, J. Kurokawa, and H. Akimoto, J. Geophys., Res., 107 (D17), 10.1029/2001JD001113, 2002. Sudo, K., M. Takahashi, and H. Akimoto, J. Geophys., Res., 107 (D17), 10.1029/2001JD001114, 2002.

  3. Present Status of CHASER Horizontal resolution: T21 (5.6゜) / T42 (2.8 ゜) Vertical resolution: 32 layer (Upper boundary ca. 35 km) Advection Scheme: Flux-Form Semi-Lagransian [Lin and Rood, 1996] Radiation Scheme: Discrete Ordinate Method + k-distribution [Nakajima et al., 1996] Chemistry Scheme: Tropospheric chemistry up to ca. 20 km Chemical Species: 51 Gas phase reactions: 94 Photolytic reactions: 24 Liquid phase reactions: 4 Heterogeneous reactions: 1

  4. Radiative forcing (W m-2) due to tropospheric ozone increase calculated by CHASER （preindustrial  present-day） Global NH SH LW 0.402 0.485 0.319 SW 0.085 0.107 0.063 LW＋SW 0.487 0.592 0.382 LW＋SWtotal ozone forcing Tropospheric ozone increase 197 TgO3 (preindustrial) ↓ +10.4 DU (+58%) 311 TgO3 (present-day) Tropospheric ozone radiative forcing W m-2 (at tropopause, in annual mean) DJF Normalized radiative forcing = 0.047 W m-2 DU-1 JJA

  5. Radiative forcing (W m-2) due to tropospheric ozone increase （preindustrial  present-day） Global mean radiative forcing This work (0.49 W m-2) (W m-2)

  6. Future prediction experiment of tropospheric ozone SRES-A2 Emission Scenario

  7. Change of Tropospheric Ozone Production Rate SRES-A2 1990  2050  2100

  8. The meteorological effect of El Nino (1997) on the tropospheric chemistry Difference (anomaly) : October 1997 minus October 1996 [Sudo and Takahashi, 2001]

  9. Changes over 10oS-10oN (Lon.-Alt.) Oct. 1997 minus Oct. 1996 Ozone (ppbv)  Convective mass flux  & up/downward motions Specific humidity (g/kg)  Ozone chemical lifetime (%) 

  10. Future Plan using CHASER Model Development Inclusion of aerosol model Integration of stratospheric chemistry model Model Simulation Past simulation and Future prediction of air quality based on new emission models Global warming Prediction using fully-coupled CHASER/AGCM

  11. Concept of Integrated Model Developmentat FRSGC radiation cloud distribution radiation Climate (CCSR/NIES AGCM 5.7) transport transport SST production Aerosol (SPRINTARS) Chemistry (CHASER) heterogeneous reaction Sea Salt dust, OC CO2 NMHCs mineral DMS Ocean (an NPZD-type model) Land Surface (MATSIRO,Sym-CYCLE)

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