Figure 4.12: July zonal
mean increase in tropospheric O3 (ppb) as a function of latitude and
altitude from Y2000 to Y2100 adopting SRES A2p projections for CH4,
CO, VOC, and NOx. Results are shown for a sample of the chemistry-transport
models (CTM) participating in IPCC OxComp workshop. Increases range from 0 to
more than 80 ppb. Changes in the stratosphere (defined as O3 > 150
ppb in that model�s Y2000 simulation) are masked off, as are also regions
in the upper troposphere for some CTMs (UKMO, HGIS) where O3 is not
explicitly calculated. See Table 4.10 for participating
models.
