Abstract:
This directory (experiment) contains volcanic SO2 data derived from limb viewing satellites for the lower stratosphere from 1998 to 2012. The usage of the data is described in Timmreck et al., (2018), datasets VolcDB1 and VolcDB1_3D.
We provide 3D-plumes of observed volume mixing ratio perturbations in the lower stratosphere / upper
troposphere typically derived from 10-day periods as nc-files and integrated values of injected SO2 mass with peak
latitudes and altitudes as Fortran formatted ascii files (A11,5(1X,I3),I4,4(1X,I3),5(1X,I2),I3,4(1X,I2)) for at
maximum 5 events at one time. Instead of A11 I2,I5,I5 can be used to read in the components of time. The data from
Dec. 1997 to Jan. 2002 are based on L2-files of SAGE II (V7.0) provided by the NASA DAAC (Thomason et al., 2008).
The data from Jul. 2002 to Mar. 2012 use the updated 5-day time series of MIPAS (Hoepfner et al., 2015),
supplemented by SO2 derived from GOMOS extinctions (Bingen et al., 2017, with a corresponding table).
SO2volc3D_pap_T42L90r.nc: 3D SO2 for 131 events in T42L90 resolution (ECHAM-grid in grid_T42L90.nc) surface to
about 80km)..
SO2volc3D_pap_T63L90r.nc: same in T63L90 resolution (ECHAM-grid in grid_T63L90.nc). Here a downscaling by
0.7 for low latitude eruptions is recommended because of less removal by overshooting convection (The data
in the T42 file and in the table in Bingen et al 2017 were upscaled within the measurement uncertainty to
overcome the model artifact in low resolution, this applies only for the ENVISAT part from Jul. 2002 on).
Latitude from South to North, for use with ECHAM please reverse. The levels on the hybrid-grid in the grid
files are defined as lev(x,y,z)=hyam(z)+hybm(z)*apsave(x,y), in Pa (apsave annual average of surface pressure
or orography).
Volcano_or_region_echam_merged_dd_mm_yyyy.txt: integrated SO2 mass injected (in kt), SAGE and ENVISAT period.
The postscript-file is an example on the T42 grid, the *doc-file includes the volcano names for the data in
the *.txt Files, see also http://wwww.volcano.si.edu (Smithsonian volcano database).
AEROCOM-DIEHL_UMZ1_tropo11.nc: Fluxes from outgassing volcanoes in the troposphere (below 200hPa), taken
from AEROCOM (Diehl, 2012; Caution, filled with odd climatology after 2009, monthly, beginning in Jan. 1950)
AEROCOM-DIEHL_1297-0312_tropo11.nc: Subset beginning Dec. 1997.