The Global Emissions Inventory Activity (GEIA) is an activity of the
International Global Atmospheric Chemistry (IGAC) Core Project of the
International Geosphere-Biosphere Program (IGBP). The focus of GEIA
is to make global emissions available on a one degree grid.
A time-averaged inventory of subaerial volcanic sulfur emissions is
presented primarily for the use of global sulfur and sulfate ... modelers.
This inventory is based upon the 25 year history of making sulfur,
primarily sulfur dioxide, measurements at volcanoes. These "hard"
data are then extrapolated to other volcanoes. Actual measurements of
subaerial volcanic SO2 emissions indicate a time-averaged flux of 13
Tg/a SO2 based upon an early 1970's to 1997 time frame. When
considering the other sulfur species also present in volcanic
emissions, a time-averaged inventory of subaerial volcanic sulfur
emissions is 10 Tg/a S.
The GEIA repository for this inventory contains nine files. The file,
volcanos.txt, is a copy of the inventory description. Volcano
altitudes are in volcalt.txt and the references used to construct the
inventory in bibliography.txt. Volcano locations are stored in
LOCavg1.1a and plotted in LOCavg1.ps. SO2 from continuously emitting
volcanoes are stored in COVavg1.1a and plotted in COVavg1.ps. SO2
from sporadically emitting volcanoes are stored in SPVmax1.1a and
plotted in SPVmax1.ps.
More information about GEIA, its products, and the data
presented here can be accessed at