Meteor3/TOMS
August 2006

The datafiles in these subdirectories came from the Meteor3 TOMS instrument
and were generated by the TOMS science processing system at NASA/GSFC.

Data files:

data/ozone/Yyyyy/L3_ozone_m3t_yyyymmdd.txt
	These are Meteor3/TOMS ozone data files for year yyyy with 
	naming convention L3_ozone_m3t_yyyymmdd.txt, Level-3 gridded data 
	from year yyyy, month mm and day dd. Details of this format are
	explained in the METEOR3_USERGUIDE.PDF, available in the
	parent directory of this path. Some format information is
	provided in ASCII file FORMAT.DOC in this directory.

data/reflectivity/Yyyyy/L3_reflc_m3t_yyyymmdd.txt
        Meteor3 reflectivity data in same format as ozone data files.

A Fortran stub program, RDGRID.FOR, for reading these ASCII gridded ozone
and reflectivity data files, is provided in this directory.

.............................................................................

data/overpass/OVPxxx_m3t.txt 
        A subset (seconds UT, latitude, longitude, total ozone, surface 
	reflectivity, solar zenith angle, aerosol index, SOI index, etc) 
	of Meteor3 data specific to a particular latitude-longitude location. 
	xxx designates a numerical site location as listed in file 
	"1SITELIST" in the 'overpass' directory.

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_m3t files.

...............................................................................

data/zonal_means/zm_month.m3t and zmday_YY.m3t	
	Zonal mean averages of the version 7 Meteor3
        ozone data. The monthly zonal means are in the file zm_month.m3t, 
	while the daily zonal means are in file named for each year, for
	example, zmday_91.m3t. The averages are for 5 degree latitude
	zones, area weighted.
 
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 data are downloaded and used in publication, please give proper
credit to the NASA/GSFC TOMS Ozone Processing Team (OPT).

For more information concerening Meteor3 data files, contact
         Dr. Jay R. Herman
	 Code 613.3
	 NASA/Goddard Space Flight Center
	 Greenbelt, Md. 20771
	 herman@tparty.gsfc.nasa.gov