Upcoming events for MLS team

1
Overview Report Aura Validation Working Group
Meeting (L. Froidevaux)
impact of stray/scattered light on grd-based and
OMI measurements.
Mentioned IONS-campaigns, and mobile trailer for
further validation and science studies
potential plans for
the future.
2
HIRDLS Validation
HIRDLS Review
HIRDLS Operational
Launch
V003(v2.04.09)
V002(v2.02.07)
V004
2005
2006
2007
2008
2004
ST30
ST13
ST23
L.Bal.
L.Bal.
START08
INTEX-B
H-AVE
TC4
ARCTAS
P-AVE
CR-AVE
WAVES06
WAVES07
WAVES08
SAUNA
MOHAVE
MOHAVE2
ACE
ENVISAT / MIPAS
CALIPSO
HALOE/UARS
SAGE III

• P-AVE Polar AURA Validation Experiment 2005
  1/24-2/9 (M. Schoeberl, E. Jensen)
• H-AVE Houston AURA Validation Experiment, 2005
  6/9-7/7 (P. Newman, D. Fahey)
• CR-AVE Costa Rica AURA Validation Experiment,
  2006 1/9-2/11 (P. Newman, E. Jensen)
• INTEX-B Intercontinental Chemical Transport
  Experiment, 2006 3/15/12 (M. Gaunce, H. Singh,
  M. Schoeberl )
• TC4 Tropical Composition, Cloud and
  Climate Coupling, 2007 6/268/13 (D. Starr, B.
  Toon)
• ARCTAS Arctic Research of the Composition of
  the Troposphere from Aircraft and Satellites,
  2008 Apr 1-21 (K. Shiffer, D. Jacob, H. Singh)
• START08 Stratosphere-Troposphere Analyses of
  Regional Transport, 2008 4/ 21- 5/16 June
  16-28, (E.Atlas, L. Pan, K. Bowman)
• SAUNA Sodankylä Total Column Ozone
  Intercomparison, 2006, 3/27-4/12
• MOHAVE Measurements Of Humidity in the
  Atmosphere Validation Experiments, 2006 Oct
  14-28 2007 Oct1-15 (T. Leblanc, S. McDermid)
• WAVES Water Vapor Val. Exp., Sum 200607,
  Win 2008 H2O, O3, T, balloon sondes, lidar ,
  Beltsville, MD (D. Whiteman)
• Large Bal. Large Balloon payloads, 9-10/2005,
  1/2007
• ACE-FTS Atmospheric Chemistry Experiment on
  Canadian satellite SCISAT-1, (P. Bernath, K.
  Walker)
• CALIPSO Cloud-Aerosol Lidar and Infrared
  Pathfinder Satellite Observation (D. Winker, J.
  Pelon)
• HALOE Halogen Occultation Experiment (J.
  Russell)
• SAGE III Stratospheric Aerosol and Gas
  Experiment (P. McCormick)
• MIPAS Michelson Interferometer for Passive
  Atmospheric Sounding on European satellite
  ENVISAT
• COSMIC GPS receivers on, launch June 2006

3
HIRDLS Validation
Summary of Validated Data Quality
(v4) Temperature Range 1 - 400 hPa
Ozone Range 1 - 260 hPa (mid-high Lat),
1-100 hPa (tropics) Nitric Acid Range 10 - 161
hPa ACE-FTS, MLS comparisons,
Clouds/Aerosol Range 10 - 422 hPa CALIPSO
comparisons 12.1 µm Extinction Range 20 - 215
hPa new product CFC-11 Range 26 - 287 hPa
MIPAS comparisons CFC-12 Range 10 - 287
hPa MIPAS comparisons Vertical Resolution
1 km Currently working toward future
release H2O, CH4
see Posters Gille
Eden NO2, N2O, ClONO2, N2O5 Correction
improving. HIRDLS V4 Data Quality
Document on the NASA DISC link on the AVDC
4

• MLS Overview of progress for cal/val issues
• Some important activities relate to the upcoming
  (2009) v3 retrievals
• CO expect reduction of biases in UT CO use
  of AVE CO profiles as truth
  ? points to a sloping
  radiance artifact may get corrected in v3 data.
• O3 higher vertical resolution product is
  planned
• H2O RHi will be useful products at 383 hPa
  (tropics) / 464 hPa (high
• lats.) also, artificial kink in profiles
  near 30 hPa will be eliminated.
• HCl is very useful for studying chlorine
  processing issues however, an issue
• has emerged in terms of the determination
  of its slow long-term decrease
• (diff. bands giving diff. results version
  2 trend seems too slow)
• HOCl ( p 20-30)
  
• ? should agree well with balloon data
• Preliminary results from v3 data processing
  algorithms indicate that retrieval
• of CH3Cl significantly reduces ClO LS bias
  ? add CH3Cl as MLS product
• - HNO3 Good overall agreement found in HNO3/O3
  correlations from in situ
• data vs balloon satellite data (MLS,
  ACE-FTS) Popp et al., JGR, sub.
• - OH HCN longer-term studies vs grd-based
  data models exist/continue
• JPL FTUVS OH column comparisons
  
• Univ. of Edinburgh studies for HCN

5

• MLS cal/val issues
• Additional correlative data needs?
• - additional cloud information (particle
  size distribution)
• would be very useful to help reduce
  uncertainties in IWC product
• (given very large range of model values
  for IWC)
• - additional balloon data can be useful
  
  
• e.g. for HCl, HOCl at midlatitudes
  possibly ClO in polar regions
• - Longer-term validation of interannual changes
  will be based mostly on continuing comparisons
  versus other satellite datasets and on NDACC data
• MOZAIC and SHADOZ useful for continued
  calibration/validation efforts for upper
  tropospheric and lower stratospheric products.
• One can always do more validation versus
  existing correlative data
• most biases/issues already identified for
  MLS products
• see JGR special issue on Aura validation,
  2007/2008
• however, some things are also very tough to
  validate
  (e.g., retrieved profiles in cloudy
  conditions)

6
TES Version 3 reprocessing is complete CH4,
Limb Products are provisionally validated. TES
Version 4 data has undergone
preliminary validation analyses
(processing began in early Sep
2008)
T Improvements to
nadir temperature key feature of V04 data Bias
improved to less than 0.5K compared to sondes at
nearly all altitudes Bias at 400 hPa is 0.7K See
R Herman et al. poster presentation on
Wednesday CH4 TES nadir methane retrievals
processed as representative tropospheric VMR
are biased 3-4 high relative to aircraft
data See V Payne et al., presentation Wed
445 O3 Minor changes to ozone retrievals -
Fewer cases with anomalous high O3 near surface
in V04 CO, nadir H2O, HDO, limb products
consistent with V03
7
TES V03
Plan to upgrade from yellow to green for
mid-2009 (V04 data)
8
OMI Column Ozone
-
very good overall agreement (TOMS DOAS vs
ground-based) - refinements being worked on, in
particular for high latitudes
where high SZA and T-dependent
effects lead to larger diffs.
(issues include UV absorption cross sections)
TOMS - DOAS
No South Pole (lat 75 S)
Data Courtesy Dr . Dimitris Balis Aristotle
University of Thessaloniki OMI AO 2925
9
Volcanic plume SO2 validation
Use the latest data version (collection 3)!
- Aerosols AOD scatter has been reduced in the
collection 3 data.


- NO2 validation vs ground-based and other
satellites ( retrieval changes) continuing.
- Ozone profiles new results
(from different retrievals, KNMI and U.S.
overall nice agreement versus MLS O3 but coarse
vertical resolution and some oscillations.
- NO2 is highest val. priority
toughest validation is for BrO, OClO, H2CO,
CHO-CHO
10
Preliminary Summary of AquaVIT (H2O
intercomparison)
by D. Fahey

• Motivation Lack of agreement/consistency
  between in situ and remote water vapor
  measurements below 10 ppm in the UT/LS
• Response Conduct a ground-based in situ
  intercomparison campaign with key instruments and
  investigators

• The AquaVIT intercomparison was a success
  but will not by itself resolve AVE
  discrepancies.
• For core instruments AIDA-TDL, CFH, FISH, FLASH,
  HWV, JLH
• For 1-10 ppm, avg deviations (from avg) within
  10
• Absolute standard for multi-instrument
  calibration not yet developed
• Implications for field observations
• Observed avg differences between CFH and HWV are
  smaller than in field observations (but have same
  sign)
• Larger differences may be caused by specific
  sampling issues on the respective platforms

AVE campaign data
11

• H2O (continued)
• MOHAVE-type campaigns Thierry Leblanc et al.,
  using ground-based H2O Raman lidars are pushing
  H2O up to 15-20 km (but probably also requires a
  number of years of careful intercalibration work
  among various measurements)
  
  Note when ready, this could be coupled
  to aircraft measurements, to help resolve H2O
  cal./val. issues between in situ and
  sonde/satellite data
  Questions for the
  future (TBD)
  
  Will such a validation path be pursued
  (financed/organized)?
  What will follow-up to AquaVIT be?
• - Also, GRUAN (GCOS Reference Upper Atmosphere
  Network) is being set up by H. Vömel et al.,
  aiming to provide high vertical resolution
  reference data in the troposphere and
  stratosphere for T, H2O (rel. humidity),
  pressure, winds,
  
  Besides satellite validation issues, such a
  network should address atmospheric and long term
  climate issues

12
OMI Validation with theGround-Based WSU MFDOAS
Spectrometer(G. Mount et al.)
HCHO
SO2
The good, the serendipitously good,
and the mystery
More campaigns and OMI validation planned
(glyoxal also).
13
Also, various posters at this meeting (and talks)
present(ed) updates on
calibration/validation studies
relating to Aura measurements

current and future