Aviation and the Global Atmosphere

Aviation and the Global Atmosphere
HSCT Fleet
HSCT Cruise
SO2 Gas to
SAD Name
Size
Altitude
Particle Conversion Reference
SA0 n/a n/a n/a SAGEII, WMO (1992)
SA1 500 Std 50% AER 2-D Model
SA2 1000 Std 50% AER 2-D Model
SA2-2km 1000 -2 km 50% AER 2-D Model
SA3 500 Std 100% AER 2-D Model
SA4 1000 Std 100% AER 2-D Model
SA5 500 Std 10% AER 2-D Model
SA6 1000 Std 10% AER 2-D Model
SA6-2km 1000 -2 km 10% AER 2-D Model
SA7 500 Std 0% AER 2-D Model
Reaction rate constants are from DeMore et al. (1997). There is no recommendation in DeMore et al. (1997) for the yield of hydrogen chloride (HCl) from the OH+ClO
reaction. Lipson et al. (1997) recently measured a temperature-dependent yield of 5-6%. Most models assume that the HCl yield from the OH+ClO reaction to be 0%.
However, the CSIRO, LARC, and SLIMCAT models assume a 5% yield of HCl from OH+ClO. Because of the nonlinear dependence of reaction rate constants on
temperature, the zonal average reaction rate constant calculated using local temperature as the air parcel moves around the globe zonally is different from the rate
constant calculated using zonal-mean temperature. Some 2-D models chose to account for this effect by using a zonal temperature distribution based on observations;
other models just used zonal mean temperature.
Table 4-10: Extra baseline scenarios that include the fleet of "subsonic-only" aircraft necessary for
comparison with certain supersonic scenarios. Bold italicized text highlights difference from scenario D.
Scenario Year
Cly (ppbv)
PSC
Representation SAD Representation
D 2015 3.0 Included SA0
D3 2015 3.0 Included 4 x SA0
D4 2015 3.0 Removed SA0
D5 2015 1.0 Included SA0
D6 2015 4.0 Included SA0
D7 2015 3.0 Included Sulfate microphysics with SO2 gas-to-particle
http://www.ipcc.ch/ipccreports/sres/aviation/049.htm (4 von 13)08.05.2008 02:42:26
conversion of 50%