Description
In many regions of the world, fires are an important and highly variable source
of air pollutant emissions, and they thus constitute a significant if not dominant
factor controlling the interannual variability of the atmospheric composition.
This paper describes the 41-year inventory of vegetation fire emissions constructed
for the Reanalysis of the Tropospheric chemical composition over the past 40 years
project (RETRO), a global modeling study to investigate the trends and variability
of tropospheric ozone and other air pollutants over the past decades. It is the first
attempt to construct a global emissions data set with monthly time resolution over
such a long period. The inventory is based on a literature review, on estimates
from different satellite products, and on a numerical model with a semiphysical
approach to simulate fire occurrence and fire spread. Burned areas, carbon consumption,
and total carbon release are estimated for 13 continental-scale regions, including
explicit treatment of some major burning events such as Indonesia in 1997 and 1998.
Global carbon emissions from this inventory range from 1410 to 3140 Tg C/a
with the minimum and maximum occurring in 1974 and 1992, respectively
(mean of 2078 Tg C/a). Emissions of other species are also reported (mean CO of
330 Tg/a, NOx of 4.6 Tg N/a, CH2O of 3.9 Tg/a, CH4 of 15.4 Tg/a, BC of 2.2 Tg/a,
OC of 17.6 Tg/a, SO2 of 2.2 Tg/a). The uncertainties of these estimates remain
high even for later years where satellite data products are available. Future versions
of this inventory may benefit from ongoing analysis of burned areas from satellite
data going back to 1982.
; Heil, Angelika 
