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Alternative fuels NOx and SO2 emissions

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Alternative fuels NOx and SO2 emissions Powered By Docstoc
					        SLIMCAT model:
  SO2 and NOx aircraft emissions.

            UcamDChem




28/08/08
Cambridge
                            Centre for Atmospheric Science
                SLIMCAT CTM
24 levels from ground to 60km.
Choice of horizontal resolutions:T21
Calculates the behaviour of 48 species and includes more
than one hundred photochemical reactions as well as nine
heterogeneous reactions on PSCs and sulphur aerosols.
The reaction rates are based on the JPL2002
recommendations (Chipperfield 1999).

Microphysical module for stratospheric sulphuric aerosol
(SAMM, Tripathi 2004).


  28/08/08
  Cambridge
             Sulphur in SLIMCAT
SO2 and OCS tropospheric sources give production of H2SO4 via
gas phase chemistry.
SAMM         simulates     homogeneous       binary     nucleation,
condensational growth, coagulation, and sedimentation of
sulphuric acid-water particles in order to predict the composition
and size-distribution of stratospheric aerosols. In SAMM,
homogeneous nucleation and condensation are coupled in a
manner that allows realistic competition between the two
processes for the limited amount of vapour. With geometrically
related size bins (50 bins for sulphuric acid-water particles in the
range 0.3 nm to 1.5 mm).
 28/08/08
 Cambridge
            Aircraft SO2 emissions:
              SLIMCAT results.
                                QUANTIFY aircraft
                                emissions
                                EISO2=0.8g/kg SO2


                               SO2: +0.008 ppb NH
                               12 km due to aircraft
                               emissions.
                               Water vapour included
                               in the emissions
                               Ozone: -0.22 ppb mid-
                               latitude NH 12km (-
                               1.%)

28/08/08
Cambridge
            Aircraft SO2 emissions:
              SLIMCAT results.




            SAD: +1.8x10-9 cm2/cm3 due to aircraft
            SO2 and water vapour emissions.

28/08/08
Cambridge
             Aircraft NOX emissions:
                SLIMCAT results.




            NOx impact from aircraft: +4.5ppbv ozone at
            10km NH.

28/08/08
Cambridge
                  Conclusion:
                SLIMCAT results
SLIMCAT chemistry and sulphuric acid aerosol microphysic are
adapted for UTLS and stratospheric studies (aircraft emissions).


Aircraft SO2 and H2O emissions impact from QUANTIFY:
        ∆SADmax = 0.18µm2/cm3
        ∆O3max = 0.22ppb (≈-1%) at the UTLS




  28/08/08
  Cambridge
                      OSLO CTM2

                      Ivar S.A. Isaksen
             nonCO2 workshop Oxford 07 2008



    Studies performed within the EU projects QUANTIFY and ECATS and
    the NRC project MAMI




28/08/08
Cambridge
            Impact of aerosols from aircraft on ozone




                                Effect of aircraft aerosols on O3
                                (ppbv).
                                3 years simulations
                                Reeduced amount of NOx –
                                reduced ozone production in LS
28/08/08
Cambridge
            Impact of aerosols from aircraft on ozone




                                Effect of aircraft aerosols on O3
                                (%).
                                (S1-R1)/R1



28/08/08
Cambridge
            Effect of aircraft NOx and H2O on O3 (ppb and %).




28/08/08
Cambridge
               OSLO CTM2
• Stratosphere (18/20km) -30ppb -2%
• UTLS -5ppb -3%

•   SO2 EI?
•   Fuel database?
•   Microphysics?
•   ΔSAD ?
28/08/08
Cambridge
            Possible Studies
• Model with sulphate aerosol microphysics?

• Producing ΔSAD from SLIMCAT results as
  monthly means.




28/08/08
Cambridge

				
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