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Information on the global distribution of tropospheric ozone, its observed rise over the 20th century, and the radiative forcing by tropospheric ozone. Studies that discuss maximum and minimum values of ozone, the impact of anthropogenic pollution and biomass burning, and the underestimation of observed trends by models. It also explores the potential larger radiative forcing by tropospheric ozone than ipcc values.
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Zhang et al. [2010]
TES thermal IR satellite observations for 2006, seasonal means at 500 hPa
Maximum values at northern mid- latitudes in spring-summer due toanthropogenic pollution; •
High values in tropical regions affected by seasonal biomass burning; •
Minimum values over tropical oceans due to chemical loss
th
Preindustrialozone models
Observations at mountainsites in Europe[Marenco et al., 1994]
Models underestimate the observed trend
Mean mass-weighted tropospheric values computed from GEOS-Chem model
for present-day (PD), pre-industrial (PI), and last glacial maximum (LGM) Ozone, ppb
5
molecules cm
two different climatereconstructions
Lee Murray, Harvard
LGM to pre-industrial
Pre-industrial to present
Montzka et al., 2011
Montzka et al. [2011]
