TOMS/Earth Probe Ground Station Overpass Data V008 (TOMSEPOVP) at GES DISC
Entry ID:
GES_DISC_TOMSEPOVP_V008
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Summary
Abstract:
This data product contains TOMS/Earth Probe Ground Station Overpass Data Version 8 in ASCII format. The overpass data files contain the data derived from the best-matched TOMS field-of-view (FOV) to a site for every day the TOMS instrument was operational. Four TOMS instruments were successfully flown on the following satellites: Nimbus-7 (Nov. 1978 - May 1993), Meteor-3 (Aug. 1991 - Dec. 1994), ... Earth Probe (July 1996 - current), and ADEOS (Sep. 1996 - June 1997). The TOMS Earth Probe, Meteor-3 and Nimbus-7 data were reprocessed using the Version-8 algorithm by the Laboratory for Atmospheres at NASA Goddard Space Flight Center (Code 614).
Each overpass file contains four (4) header records, followed by all the data records.
HEADER RECORDS
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The file header consists of four (4) records:
1. Site name, ID, and location.
2. Overpass program run information
3. Column headings
4. Marker record.
An example of the first header record is:
Edmonton/Stony Plain, Canada ID: 21 Lat: 53.55 Lon: -114.10 Alt: 766
In this example, the site ID number is 21, the latitude is 53.55N and
longitude is 114.10E, and the verified elevation is 766 m (above sea level).
The FORTRAN format code for reading the first header record is:
(A30, 4X, I3, 7X, F7.2, 7X, F7.2, 7X, I4)
An example of the second header record is:
EarthProbe TOMS V.8 Overpass - Generated: 3-January-2006
This indicates the spacecraft instrument, the data version used to generate
the overpass data, and the date on which the file was generated (created or
updated).
The third header record contains the column headings for the data records.
The header looks like this:
MJD Year Day sec-UT SCN LAT LON DIS PT SZA OZONE REF A.I. SOI
The contents of each column is described below in the section on Data
Records.
The fourth header record simply contains a pound-sign (#) in the first
column, and signals that the data begin with the next record in the file.
DATA RECORDS
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Each data record contains fourteen (14) values. They are as follows.
MJD Modified Julian Day. Astronomical Julian Day number, less
2,400,000.5. The number is given to the nearest 1/10 day.
Year The four-digit Gregorian year number of the TOMS measurement.
Day The day number (day 1 through 366) of the TOMS measurement.
sec-UT The number of seconds from midnight, Universal Time. on the day
specified by Year and Day.
SCN TOMS instrument scan position (1--35 for N7, M3, EP; 1--37 for
Adeos)
LAT Latitude of the center of the IFOV.
LON Longitude of the same.
DIS Distance from site and IFOV center position, in km.
PT Terrain pressure at IFOV center, in (atm x 100)
SZA Solar zenith angle, in degrees, at time and location of IFOV
OZONE TOMS best total ozone, in Dobson Units (DU)
REF TOMS reflectivity at 380 nm (N7, M3) or 360 nm (EP,
Adeos).
A.I. TOMS aerosol index.
SOI TOMS sulfur dioxide index.
The FORTRAN format code for reading a data record is:
(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) 
Purpose:
This product can be used to compare TOMS with ground station data.
Related URL
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Description:
Data from the GES-DISC Mirador fast data search and download system.
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Geographic Coverage
(Click for Interactive Map)
Spatial coordinates
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N: 90.0
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S: -90.0
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E: 180.0
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W: -180.0
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Data Set Citation
Dataset Originator/Creator:
TOMS Science Team
Dataset Title:
TOMS/Earth Probe Ground Station Overpass Data
Dataset Release Date:
2007
Dataset Release Place:
Greenbelt, MD, USA
Dataset Publisher:
NASA Goddard Earth Science Data and Information Services Center
Version:
008
Data Presentation Form:
Digital Science Data
Online Resource:
http://disc.gsfc.nasa.gov/
Temporal Coverage
Start Date:
1996-07-22
Stop Date:
2005-12-12
Data Resolution
Temporal Resolution:
Daily
Quality
WARNING: EP TOMS started experiencing calibration problem since 2002. For data beginning in year 2000, the calibration has been stabilized relative to NOAA-16 SBUV/2 in the equatorial zone. Because of continuing changes in the optical properties of the front scan mirror that are not well understood, data are showing a latitude dependent error that cannot be corrected by a simple calibration correction. The calibration appears to be stable near the equator. But by 50 degrees latitude, there is now a -2% to -4% error in TOMS, a bit larger in the northern hemisphere than in the southern hemisphere. Because of this error, data since 2002 should NOT be used for trend analysis
Use Constraints
EP TOMS started experiencing calibration problem since 2002. Because of the continuing changes in the optical properties of the front scan mirror that are not well understood, data started showing a latitude dependent error that cannot be corrected by a simple calibration correction. The calibration appears to be stable near the equator. But by 50 degrees latitude, there is now a -2% to -4% error in TOMS, a bit larger in the northern hemisphere than in the southern hemisphere.
Earth Probe TOMS data since 2002 should NOT be used for trend analysis because of the calibration problem.
Data Set Progress
COMPLETE
Distribution
Distribution Media:
FTP/HTTP
Distribution Size:
120 MB
Distribution Format:
ASCII
Fees:
Free
Personnel
Role:
INVESTIGATOR
Phone:
301-614-5731
Fax:
301-614-5903
Email:
Pawan.K.Bhartia at nasa.gov
Contact Address:
NASA
Goddard Space Flight Center
Mailstop 613.3
City:
Greenbelt
Province or State:
MD
Postal Code:
20771
Country:
USA
Role:
INVESTIGATOR
Phone:
301-614-6776
Email:
omar.o.torres at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Code 614
City:
Greenbelt
Province or State:
MD
Postal Code:
20771
Country:
USA
Role:
INVESTIGATOR
Email:
Jay.R.Herman at nasa.gov
Contact Address:
NASA
Goddard Space Flight Center
Mailstop 614.0
City:
Greenbelt
Province or State:
MD
Postal Code:
20771
Country:
USA
Role:
INVESTIGATOR
Phone:
301-614-6038
Fax:
301-614-5903
Email:
richard.d.mcpeters at nasa.gov
Contact Address:
NASA
Goddard Space Flight Center
Mailstop 613.3
City:
Greenbelt
Province or State:
MD
Postal Code:
20771
Country:
USA
Role:
TECHNICAL CONTACT
Phone:
301-614-5284
Email:
Suraiya.Ahmad at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Code 610.2
City:
Greenbelt
Province or State:
MD
Postal Code:
20771
Country:
USA
Role:
DIF AUTHOR
Phone:
301-614-5121
Email:
James.Johnson at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Code 610.2
City:
Greenbelt
Province or State:
MD
Postal Code:
20771
Country:
USA
Publications/References
Eck, T. F., Bhartia, P. K., Kerr, J. B., Satellite estimation of spectral UVB irradiance using TOMS derived total ozone and UV reflectivity, Geophy. Res. Letters 1995, 22, 611-614 Herman, J.R., et al., "Meteor-3 Total Ozone Mapping Spectrometer (TOMS) Data Products User's Guide." NASA reference publication 1393, 1996. McPeters, R.D., et al., "Earth-Probe Total Ozone ... Mapping Spectrometer (TOMS) Data Products User's Guide." NASA Reference Publication 206895, April 1998. ftp://toms.gsfc.nasa.gov/pub/eptoms/EARTHPROBE_USERGUIDE.PDF
McPeters, R.D., et al., "Nimbus-7 Total Ozone Mapping Spectrometer (TOMS) Data Products User's Guide." NASA Reference Publication 1384, April 1996.
Krueger, A., M. Schoeberl, P.Newman, and R.Stolarski, June 1992. "The 1991 Antarctic Ozone Hole; TOMS Observations", Geophys. Res. Letters, 19: 1215-1218.
Schoeberl, M.R., A.J. Krueger, and P.A. Newman, 1986. 'The Morphology of Antarctic Total Ozone As Seen by TOMS,' Geophys. Res. Letters, 13:1217-1220.
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date:
2011-02-23
Last DIF Revision Date:
2012-12-13
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