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INSTRUMENT SUMMARY
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TOMS ALGORITHM & CALIBRATION
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SBUV ALGORITHM & CALIBRATION
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TOTAL OZONE DERIVED ADJUSTMENTS
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Profile Averaging Procedure and Data Availability


When constructing the Profile MOD data sets we construct a 5° zonal-mean and 10° by 30° gridded daily and monthly-mean data set for each instrument. The individual monthly-mean zonal and gridded average instrument data sets are averaged to produce the monthly MOD zonal mean and gridded products. In this section, we describe in detail how the average values are calculated, and what filtering was applied to the raw instrument data before averaging.

Note that the data restrictions noted here are in addition to those noted in the Instrument section
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Filtering Criteria used in Daily and Monthly Average Products


SBUV
Profile
Criteria
  • Profile ozone error code(1)= 0
  • ascending data only
  • solar zenith angle < 84°
  • Data Quality Value(1) < 0.15
  • N7: No data 15 Mar 1982 - 28 Feb 1983(2)
  • N11: No data 12 Jun 1991 - 31 May 1992(3)
Daily
Zonal Average
Criteria
  • Minimum of 21 measurements
  • N16: Minimum of 30 measurements in equatorial band (to avoid days when scanning exercises limited normal measurements)
  • Average latitude of measurements less
    than 1° from central band latitude
  • Average Data Quality Value < 0.12
Daily Gridded Average
Criteria
  • No minimum number of measurements
  • Corresponding zonal average exists
Monthly
Zonal
Average
Criteria
  • 15 daily averages per month
  • N7: require only 10 daily averages per month to account for on/off instrument cycling during first several years
  • Average weighted by # of daily values
  • Average time of daily measurements
    within 4 days of center of month
    (avoid partial-month sampling issues)
Monthly Gridded Average
Criteria
  • No minimum number of daily averages
  • Average weighted by # of daily values
  • Corresponding zonal average exists
Comments

(1) Quality Control measures within the
      SBUV V8 Algorithm
(2)
Eruption of El Chichon
(3) Eruption of Mount Pinatubo





|
HOME
|
INSTRUMENT SUMMARY
|
TOMS ALGORITHM & CALIBRATION
|
SBUV ALGORITHM & CALIBRATION
|
TOTAL OZONE DERIVED ADJUSTMENTS
| PROFILE OZONE DERIVED ADJUSTMENTS
|


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