Total Ozone Mapping Spectrometer (TOMS) Level 2 Orbital Ozone and Reflectivity Data Set

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PARAMETER DESCRIPTION UNITS --------- ----------- ----- LSEQNO Sequential number of scan unitless YEAR Four digit year GMT DAY Day of year at start of scan GMT GMT Seconds of day GMT sec ALTITUDE Spacecraft altitude km NADIR Nadir scan angle degrees * 100 SYNC Chopper non-synch occurrence flag unitless 0 ---> doesn't occur in current or next scan 1 ---> occurs in current scan, not in next 2 ---> occurs in next scan, not current 3 ---> occurs in both current and next scan LATITUDE Geodetic latitude degrees * 100 LONGITUDE Geodetic longitude degrees * 100 SOLAR_ZENITH_ANGLE Solar zenith angle at IFOV degrees * 100 PHI Sun-satellite azimuth angle degrees * 100 TOTAL_OZONE Total column ozone amount matm-cm * 10 REFLECTIVITY Lambertian surface reflectivity % * 100 ERROR_FLAG Error flag unitless 0 ---> good data 1 ---> good data, 84 < SOLAR_ZENITH_ANGLE < 88 2 ---> 331 nm residue too large 3 ---> triplet residue too large 4 ---> SOI > 24 (SO2 contamination) 5 ---> | residue | > 12.5 for at least 1 channel 10-15 ---> same as above but for descending path OZONE_BELOW_CLOUD Ozone below cloudy portion of scene matm-cm TERRAIN_PRESSURE Ground pressure from NMC atm * 100 CLOUD_PRESSURE ISCCP climatological cloudtop height atm * 100 SOI Sulfur-dioxide index unitless + 50 ALGORITHM_FLAG Retrieval scheme indicator unitless 1 ---> A triplet alone used 2 ---> B triplet alone used 3 ---> B triplet with A triplet to select profile 4 ---> C triplet with B triplet to select profile CLOUD_FRACTION Fractional cloud cover percent MIXING_FRACTION Profile mixing fraction unitless * 10 SURFACE_CATEGORY Surface category code unitless 0 ---> ocean 1 ---> land 2 ---> low inland (below sea level) 3 ---> mixed land and ocean 4 ---> mixed land and low inland 5 ---> mixed ocean, land , and low inland THIR_CLOUD_PRESSURE Co-located THIR cloud top pressure atm * 100 NVALUE Radiance N-Values at 6 wavelengths unitless * 50 dN/dR Reflectivity sensitivity (dN/dR) -50 / % SENSITIVITY Ozone sensitivity (dN/dO3) 10^4 / matm-cm RESIDUE Nmeas - Ncalc *10 + 127

PARAMETER DATA SOURCE --------- ----------- Total Ozone Backscattered radiances measured by the TOMS instrument in four discrete spectral channels between 312.5 and 339.9 nm. Reflectivity Backscattered radiances measured by the TOMS instrument in the additional two discrete spectral channels 360 nm and 380 nm.

PARAMETER DATA TYPE DIMENSIONS --------- --------- ---------- LSEQNO int16 394 YEAR int16 394 DAY int16 394 GMT int32 394 ALTITUDE int16 394 NADIR int16 394 SYNC int16 394 LATITUDE int16 394 x 35 LONGITUDE int16 394 x 35 SOLAR_ZENITH_ANGLE int16 394 x 35 PHI int16 394 x 35 TOTAL_OZONE int16 394 x 35 REFLECTIVITY int16 394 x 35 ERROR_FLAG int16 394 x 35 OZONE_BELOW_CLOUD uint8 394 x 35 TERRAIN_PRESSURE uint8 394 x 35 CLOUD_PRESSURE uint8 394 x 35 SOI uint8 394 x 35 ALGORITHM_FLAG uint8 394 x 35 CLOUD_FRACTION uint8 394 x 35 MIXING_FRACTION uint8 394 x 35 SURFACE_CATEGORY uint8 394 x 35 THIR_CLOUD_PRESSURE uint8 394 x 35 NVALUE int16 394 x 35 x 6 dN/dR uint8 394 x 35 x 6 SENSITIVITY int16 394 x 35 x 5 RESIDUE uint8 394 x 35 x 5 where: uint8 = 8-bit unsigned integer int16 = 16-bit integer int32 = 32-bit integer

Additional Features

GES DISC DAAC Data Guide:Total Ozone Mapping Spectrometer (TOMS) Level 2 Orbital Ozone and Reflectivity Data Set (Version 7)

Summary:

Table of Contents:

1. Data Set Overview:

2. Investigator(s):

3. Theory of Measurements:

4. Equipment:

5. Data Acquisition Methods:

6. Observations:

7. Data Description:

8. Data Organization:

9. Data Manipulations:

10. Errors:

11. Notes:

12. Application of the Data Set:

13. Future Modifications and Plans:

14. Software:

15. Data Access:

16. Output Products and Availability:

17. References:

18. Glossary of Terms:

19. List of Acronyms:

20. Document Information:

GES DISC DAAC Data Guide:
Total Ozone Mapping Spectrometer (TOMS) Level 2 Orbital Ozone and Reflectivity Data Set (Version 7)