Model Estimations Of The Effect Of Siberian Strong Fires On Atmospheric Composition And Regional Climate During 2002–2003 Warm Periods
The strong large scale fires due to hot weather over Siberia during the 2002–2003 warm seasons were recorded. They caused a substantial intensification of atmospheric pollution by various combustion products, including CO, NOx = NO + NO2 and numerous aerosol types. An increase of North Asia CO emissions by ˜30−70% in warm seasons has been estimated for 2002 and 2003 due to the aforementioned fires. The GOME measurements of the NO2 vertical tropospheric column over China (30– 40° N, 110–123° E) show its significant growth after 2000–2001 reaching 15–40% in various months.
The above data have been adapted for our study. The comparison of model variants with and without this additional source has been carried out. The largest response of atmospheric composition to the Siberian fires is near the location of the pollution sources in August 2003 when the surface concentration increases for CO and NOx were 66% and 40%, respectively. Their growth caused the OH content to decrease by 12–14% and the ozone concentration to increase by 10–16%. The eastward transport of CO causes the CO content growth by 25–30% over the Pacific and about 20% near the western coast of North America.
The obtained model distribution of species content is used further for radiative forcing calculations due to the consequences of Siberian forest fires. According to our analysis the relevant radiative forcing does exceed a few hundredths W/m2 near the pollution sources and much less within remote regions.
KeywordsCarbon monoxide nitrogen oxides forest fires ozone hydroxyl
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