The FTP menu gets data from the following site and directories -
ftp://jwocky.gsfc.nasa.gov/pub/{eptoms|nimbus7}/data/aerosol/{year}/
file = L3_aersl_{ept|n7t}_{year}{month}{day}.txt
More current information is available from the README files on the NASA server.
TOMS Earthprobe datasets are located in the following directory paths:
The values are in 3 digit groups 111222333444555
Sample ozone value: 234 = 234 du 0 = fill value
The data are an aerosol index formed directly from the measured radiances in two TOMS channels. Positive values generally represent absorbing aerosols (dust and smoke) while negative values represent nonabsorbing aerosols. The identification is not perfect because of geophysical reasons (e.g., aerosol too low to the ground). There will soon be a corresponding data set of optical depths and single scattering albedos.
The values are in 3 digit groups 111222333444555References:
UV Erythemal Irradiance
The values are in 3 digit groups 111222333444555
123 = 2.3x10^1 J/m2 -23 = 2.3 --3 = 0.3 999 = missing or bad data
The Fortran statements that wrote the data records of these monthly files are:
DO 570 IL=1,180 DO 560 jj=1,288 560 OZONE(JJ)=ozav(JJ,IL) write(21,'(1X,25I3)') (OZONE(jj),jj=1,275) write(21,'(1X,13I3,1A17)') (OZONE(jj),jj=276,288), latlab(IL) 570 CONTINUE
Fortran statements that can be used to read the 1st header
record and the data records in the OVPxxx files are the
following:
For the header record:
CHARACTER*28 site_name INTEGER*4 site_id, site_alt REAL*4 site_lat, site_lon Read(lun,2) site_name, site_id, site_lat,site_lon, site_alt 2 Format(A30,4X,I3,7X,F7.2,7X,F7.2,7X,I4)
and for the data records:
Format(F7.1,1X,I4,1X,I3,1X,I5,2X,I2,1X,F6.2,1X,F7.2,1X, I3,1X,I3,1X,F5.2,1X,F5.1,1X,F5.1,1X,F6.2,1X,I4)
1README, in this directory, provides more information about the OVPxxx files.
The Fortran statements that wrote the header and data records of file zm_month are the following:
CHARACTER*69 MONLAB Data MONLAB/'Jan Feb Mar Apr May Jun Jul Aug Sep & Oct Nov Dec'/ do 20 j=1,37 lat(j)=-95 + 5*j 20 continue write(22,'(8x,A69)') MONLAB DO 300 IZ=1,36 write(22,'(I3,I4,12f6.1)') lat(IZ),lat(IZ+1),(ozm(IM,IZ),IM=1,12) 300 CONTINUE write(22,'(I3,I4,12f6.1)') -65,0,(ozm(IM,37),IM=1,12) write(22,'(I3,I4,12f6.1)') 0,65,(ozm(IM,38),IM=1,12) write(22,'(I3,I4,12f6.1)') -65,65,(ozm(IM,39),IM=1,12)
The Fortran statement that wrote the data records of the zmday_YY
files is:
write(21,'(A12,F9.3,1X,36F6.1,3X,3F6.1)') date,yd,zmd
If these EarthProbe/TOMS data are downloaded and used in
publication, please give proper credit to the NASA/GSFC TOMS Ozone
Processing Team (OPT).
For more information on the EarthProbe/TOMS data set, contact