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GEOS-5 Configuration for AR5: Difference between revisions

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== GOCART Aerosol and CO Emissions ==
== GOCART Aerosol and CO Emissions ==
* CMIP5 anthropogenic and biomass burning emissions of CO, BC, OC, and SO2
* CMIP5 anthropogenic and biomass burning emissions of CO, BC, OC, and SO<sub>2</sub>
* References:
* References:
** Lamarque et al. (2010). Historical (1850–2000) gridded anthropogenic and biomass burning emissions of reactive gases and aerosols: methodology and application, Atmos. Chem. Phys., 10, 7017–7039.
** Lamarque et al. (2010). Historical (1850–2000) gridded anthropogenic and biomass burning emissions of reactive gases and aerosols: methodology and application, Atmos. Chem. Phys., 10, 7017–7039.
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  ftp://ftp-ipcc.fz-juelich.de/pub/emissions/gridded_netcdf/tarfiles/
  ftp://ftp-ipcc.fz-juelich.de/pub/emissions/gridded_netcdf/tarfiles/
and processed for GOCART
and processed for GOCART
* CMIP5 provides monthly emissions for each decade.  For historic emissions, the CMIP-provided anthropogenic and aircraft emissions represent the 1st year of the decade, while ship emissions represent the 5th year of the decade and biomass burning is a decadal average (see IPCC_AR5_historic_emission_and_scenario_data_for_chemistry_simulation.pdf, available from the Juelich ftp site, for details).  We interpolate between decades for each source for each month to create a monthly file for each year.
* CMIP5 provides monthly emissions for each decade.  For historic emissions, the CMIP-provided anthropogenic and aircraft emissions represent the 1st year of the decade, while ship emissions represent the 5th year of the decade and biomass burning is a decadal average (see IPCC_AR5_historic_emission_and_scenario_data_for_chemistry_simulation.pdf, available from the Juelich ftp site, for details).  We interpolate between decades for each source for each month to create a monthly file for each year.  
* Biomass burning emissions for 1900 are used for all years prior to 1900.
* Future emissions are based on the RCP4.5 scenario.
* Future emissions are based on the RCP4.5 scenario.
* CMIP5 anthropogenic emissions are broken down by source category.  We treat the “agricultural waste burning” category as the biofuel input for GOCART, and sum the other anthropogenic categories for the anthropogenic input.  Ship and aircraft emissions are input separately.  
* CMIP5 anthropogenic emissions are broken down by source category.  We treat the “agricultural waste burning” category as the biofuel input for GOCART, and sum the other anthropogenic categories for the anthropogenic input.  Ship and aircraft emissions are input separately.  
* Oxidant concentrations are fixed at modern values
* Oxidant concentrations are fixed at modern values
* SO4 ship emissions for GOCART based on CMIP SO2 ship emissions, scaled by the SO4/SO2 ratio from Edgar
* SO<sub>4</sub> ship emissions for GOCART based on CMIP SO<sub>2</sub> ship emissions, scaled by the SO<sub>4</sub>/SO<sub>2</sub> ratio from Edgar
* We convert CMIP5 aircraft BC emissions to fuel emissions for GOCART using the altitude-dependent emission ratios from Aerocom, which are based on Döpelheuer’s thesis (2002).  See readme_aerocom_aircraft.docx for more information.  We then regrid the aircraft data to 72 GEOS5 vertical levels.
* We convert CMIP5 aircraft BC emissions to fuel emissions for GOCART using the altitude-dependent emission ratios from Aerocom, which are based on Döpelheuer’s thesis (2002).  See readme_aerocom_aircraft.docx for more information.  We then regrid the aircraft data to 72 GEOS5 vertical levels.


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Van der Werf, G., J. T. Randerson, L. Giglio, G. J. Collatz, P. S. Kasibhatla, and A. F. Arellano Jr. (2006), Interannual variability in global biomass burning emissions from 1997 to 2004, Atmos. Chem. Phys., 6, 3423­3441.
Van der Werf, G., J. T. Randerson, L. Giglio, G. J. Collatz, P. S. Kasibhatla, and A. F. Arellano Jr. (2006), Interannual variability in global biomass burning emissions from 1997 to 2004, Atmos. Chem. Phys., 6, 3423­3441.


== PCHEM Concentrations of Greenhouse Gases ==
== Prescribed CMIP5 Concentrations of Trace Gases Used in the Radiation Calculations ==
* N<sub>2</sub>0, CH4, CFC-11, CFC-12, and HCFC-22
 
In all cases, the 3-dimensional distributions of mixing ratios are relaxed to the prescribed zonal-mean values described here, using a time scale of 3 days. In addition, the gas concentrations are subject to large-scale advection and to mixing by subgrid-scale convective and turbulent processes.
 
* '''N<sub>2</sub>0, CH4, CFC-11, CFC-12, and HCFC-22'''
** Compute 5-year running averages of monthly zonal means from a 1950-2010 GEOS-5 CCM-V1 simulation.
** Compute 5-year running averages of monthly zonal means from a 1950-2010 GEOS-5 CCM-V1 simulation.
** Calibrate to the tropospheric specification from CMIP5 historic mid-year concentrations.
** Calibrate to the tropospheric specification from CMIP5 historic mid-year concentrations downloaded from http://www.iiasa.ac.at/web-apps/tnt/RcpDb/dsd?Action=htmlpage&page=welcome.
** Project early 1950s concentrations back to 1870 based on the CMIP concentrations.
**References
**References
*** M. Meinshausen, S. Smith, et al. "The RCP Greenhouse Gas Concentrations and their extension from 1765 to 2500" (in prep.), Climatic Change (Special Issue on RCPs)
*** M. Meinshausen, S. Smith, et al. "The RCP Greenhouse Gas Concentrations and their extension from 1765 to 2500" (in prep.), Climatic Change (Special Issue on RCPs)
*** http://www.iiasa.ac.at/web-apps/tnt/RcpDb/dsd?Action=htmlpage&page=welcome#descript
*** http://www.iiasa.ac.at/web-apps/tnt/RcpDb/dsd?Action=htmlpage&page=welcome#descript
*** http://www.pik-potsdam.de/~mmalte/rcps/index.htm
*** http://www.pik-potsdam.de/~mmalte/rcps/index.htm
** CMIP-recommended concentrations downloaded from http://www.iiasa.ac.at/web-apps/tnt/RcpDb/dsd?Action=htmlpage&page=welcome
 
** Project early 1950s concentrations back to 1870 based on the CMIP concentrations.
* '''Ozone'''
* Ozone
** AC&C/SPARC monthly averages 1870-2005 downloaded from ESG: ftp-esg.ucllnl.org.
** AC&C/SPARC monthly averages 1870-2005, converted to zonal means
** These were converted to zonal means,
** SPARC fields downloaded from ESG: ftp-esg.ucllnl.org
** undefined values near the surface were removed by filling, and
** zonal means were interpolated to GEOS-5 layers.
** References:
** References:
*** http://www.pa.op.dlr.de/CCMVal/AC&CSPARC_O3Database_CMIP5.html
*** http://www.pa.op.dlr.de/CCMVal/AC&CSPARC_O3Database_CMIP5.html
*** Cionni, I., V. Eyring, J.-F. Lamarque, W. J. Randel, F. Wu et al., AC&C/SPARC ozone database in support of CMIP5 simulations, Atmos. Chem. Phys, in preparation, 2010.   
*** Cionni, I., V. Eyring, J.-F. Lamarque, W. J. Randel, F. Wu et al., AC&C/SPARC ozone database in support of CMIP5 simulations, Atmos. Chem. Phys, in preparation, 2010.   
** indefinites removed
 
** interpolated to GEOS-5 layers
* '''H<sub>2</sub>O above the tropopause'''
* H<sub>2</sub>O
** Compute 5-year running averages of monthly zonal means from a 1950-2010 GEOS-5 CCM-V1 simulation.  
** Compute 5-year running averages of monthly zonal means from a 1950-2010 GEOS-5 CCM-V1 simulation.  
** Project early 1950s concentrations back to 1870 based on CH4 from RCP and assuming the stratospheric age-of-air is five years.
** Project early 1950s concentrations back to 1870 based on CH4 from RCPs and assuming the stratospheric age-of-air is five years.
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