ACE Ozone Profiles

1
ACE Ozone Profiles

• Kaley Walker, Chris Boone, Randall Skelton and
  Peter Bernath, University of Waterloo
• Lucien Froidevaux and MLS team, JPL
• Marty McHugh, GATS,
• Cora Randall, LASP, University of Colorado
• Chip Trepte, NASA Langley,
• Svetlana Petelina and Ted Llewellyn, University
  of Saskatchewan
• September 21, 2005

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ACE Instruments

• ACE-FTS
• a high resolution (0.02 cm-1) infrared Fourier
  transform spectrometer operating between 2-13
  microns
• 2-channel visible/near infrared imager operating
  at 0.525 and 1.02 microns
• MAESTRO
• dual UV / Visible / NIR spectrometer measuring
  from 0.285 to 1.030 microns, resolution 1-2 nm
• Measurement modes solar occultation, nadir
  (ACE-FTS) and backscatter (MAESTRO), calibration
  (sunscans)
• Instrument Pointing suntracker located within
  ACE-FTS

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All ACE measurements to June 6
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Global Distribution of Occultations
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ACE Ozone Data

• ACE ozone profiles are available from three
  sources (occultation mode measurements)
• ACE-FTS v2.2
• Retrievals cover range from 5 to 95 km
• Microwindows used
• 32 between 1022 1168 cm-1
• 22 between 1803 2121 cm-1
• ACE-MAESTRO v1.1
• One profile produced from each spectrometer - UV
  and VIS
• Retrievals from lt10 km up to 100 km
• Currently, p and T profiles from ACE-FTS are used
  in MAESTRO retrieval

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ACE-FTS - POAM III O3
ACE-FTS up to 25 higher than POAM from 40-60 km
Lower than POAM III by up to 10 from 15 and 40
km. Maybe due to difference in vertical
resolution?
average latitude 67N
Profiles within 500 km and 2 hours POAM III v
4.0 and ACE-FTS v1.0
Thanks to Cora Randall
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ACE-FTS - SAGE III comparison
ACE-FTS up to 38 higher than SAGE III from 40-55
km
No indication of significant altitude
registration errors but between 15-40 km, ACE-FTS
lower than SAGE III by 10
average latitude 76N
Profiles within 500 km and 2 hours SAGE III v
3.0 and ACE-FTS v 1.0
Thanks to Chip Trepte
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O3 ACE-FTS - HALOE
ACE-FTS and HALOE are within 5 from 15 to
35 ACE-FTS is 0.4 ppmv higher from 35 to 70
km 29 Coincident Events in July 2004 at 66 N
(within 500 km and 3 hours) plus 2 on Jan 17 (60
S) and 1 on Feb 12 (48 N) in 2004 ACE-FTS version
1.0, HALOE v19
Marty McHugh
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ACE-FTS vs ACE-MAESTRO
Jay Kar
ACE-FTS v 1.0 and MAESTRO v1 data
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Improvements in ACE-FTS

• Between version 1.0 and later ones
• Generally see similar behavior, ACE-FTS tends to
  be lower than comparison in region near peak in
  concentration
• In comparisons with UV-visible spectrometers,
  discrepancy generally smaller with later
  versions 5-7 rather than 10

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ACE-OSIRIS O3 comparisons

• Sunsets in March 2005 Latitude range 50
  82 ACE-FTS v2.2, OSIRIS v2.4 data, using
  criteria 5 latitude, 10 longitude, 7 hours
• Between 15-30 km, ACE-FTS is within 5 (or
  better) of OSIRIS results improvement over
  ACE-FTS v 1.0

Svetlana Petelina
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Further Improvements

• ACE-FTS microwindows
• Inconsistent results between the two microwindow
  ranges used (10 micron vs. 5 micron)
• Will use consistent set at 10 micron most well
  known
• This may explain lower values near concentration
  peak
• Troposphere improvements
• Variability in v2.2 due to approximation used in
  code fixed in new version
• Ozone isotopologues will be retrieved in next
  version of ACE-FTS data set
• O3 (668) and O3 (686) and maybe O3 (667) and O3
  (676)

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ACE O3 data available

• Newest ACE data to be put into AVDC
• ACE-FTS v2.2 will be in very soon
• ACE-MAESTRO v1.1 sometime in future
• MAESTRO backscatter measurements
• New tables have been developed and command
  sequences are being implemented in planning
  system
• Expect first measurements to be taken within two
  weeks
• Looking forward to validation collaborations with
  other Aura instrument teams