OMI Validation Status

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OMI Validation Status

• Mark Kroon - KNMI
• (o.b.o. the OMI validation team)
• Aura Science Team Meeting
• Sheraton Columbia Hotel
• Columbia, MD. 25 October 2008

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JGR Aura Validation Issue
31 out of 67 papers related to OMI (on both
validation and science)! High quality
peerreview and webpublished papers! 10 papers
from OMI AO! Balis, Brinksma, Curier, Ionov,
Kramer, Krzyscin, Migliorini, Shavrina, Sneep,
Tanskanen.
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JGR Aura Validation Issue
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Validation Status COL3
Validated No Issues
Validated and Some Problems
Validated butUse with Caution
Validation Preliminary
Not Publicly Available
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Total Ozone Column OMTO3
10
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Image(s) Courtesy Dr . Dimitris Balis
Aristotle University of Thessaloniki OMI AO
2925
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Total Ozone Column OMDOAO3
10
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Image(s) Courtesy Dr . Dimitris Balis
Aristotle University of Thessaloniki OMI AO
2925
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Ground Based Validation
No South Pole (lat gt 75 S)
Data Courtesy Dr . Dimitris Balis Aristotle
University of Thessaloniki OMI AO 2925
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Total Ozone Column
OMI TOMS V8.5 - DOAS v1.0.5 DU
Total O3 Column Difference for October 2005
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Look-Up-Table Interpolation
Linear Versus Spline Interpolation
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Effective Ozone Temperature
2005-09 Relative Ozone Column Difference
(TOMS-DOAS)/DOAS
2005-09 Effective Ozone Temperature
DOAS O3 Temperature (ºC)
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Effective Ozone Temperature
Relative ozone differences partially explained by
temperature effects. OMDOAO3 made independent of
effective ozone temperature. How about OMTO3 and
Brewer and Dobson? Future work! Remaining issue
at high solar zenith angles! Future work!
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OMI MLS Ozone Profiles - Match
Preliminary results forOMI vs MLS ozone
profiles Distance lt 100 kmSame orbit
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OMI MLS Ozone Profiles - Week
Preliminary results for OMI vs MLS ozone
profiles Distance lt 100 km and Same orbit
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OMI MLS Ozone Profiles - 2006
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OMI MLS Ozone Profiles - 2006
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OMI MLS Ozone Profiles - 2006
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OMI GOMOS Ozone Profiles
Image(s) Courtesy Dr . Johanna Tamminen - FMI
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Nitrogen Dioxide Total Column
SAOZ (ECS2 vs. COL3) for OMI 2004-2007
Image Courtesy Dr. Dmitry Ionov CNRS OMI AO
2926
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Nitrogen Dioxide Tropospheric Column
OMI pixel lt 650 km2 OMI pixel gt 650 km2
SCIAMACHY
Image Courtesy Dr. Jennifer Hains KNMI
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Aerosols Optical Depth - UV
Collection 2
Collection 3
Omar Torres Collection 3 data shows significant
improvement in the accuracy of retrieved AOD
relative to collection 2 results. Noise level
significantly reduced in monthly averages.
Images Courtesy Dr. Omar Torres Hampton
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Aerosols Optical Depth multi l
'Q12'
OMI data is land only and MODIS cloud fraction
screened 'Q12' means using monthly mean surface
reflectivity data Quintus Kleipool (KNMI).
Images Courtesy Dr. Remco Braak KNMI
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Sulphur Dioxide Total Column
Mark K Would you consider the OMSO2 data product
to be of category 1 (validated), 2 (some issues)
or 3 (caution)? Nick K Volcanic SO2 data (TRL
2.5, TRM 7.5 and STL 17 ) retrieved with linear
fit algorithm are in category 2! Add 1
Products are accurate for small to moderate
volcanic SO2 plumes ( lt 50 DU). Main problem is
guessing SO2 altitude. Add 2 Current volcanic
data will underestimate SO2 for large eruptions
(gt 100 DU). Add 3 Boundary layer SO2 (PBL) is
in category 3, mostly because of high noise
(StDev 1.5DU for optimal conditions) that is
comparable or larger than real anthropogenic
signals.
Images Courtesy Dr. Nick krotkov GSFC
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Sulphur Dioxide Total Column
Images Courtesy www.temis.nl
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Bromine Oxide
Images Courtesy Dr. Thomas Kurosu
Harvard-Smithsonian Center for Astrophysics
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Formaldehyde
Images Courtesy Dr. Thomas Kurosu
Harvard-Smithsonian Center for Astrophysics
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Chlorine Dioxide
Thomas Kurosu - Harvard-Smithsonian Center for
Astrophysics There is a huge difference between
those three products between ECS2 and COL3 COL3
versions are much improved over ECS2. In fact,
use of ECS2 data is STRONGLY discouraged
... The Col 3 versions are much improved in
across-track striping (meaning there is less of
it), to the point that we currently discourage
the use of the "destriped columns"
Images Courtesy Dr. Thomas Kurosu
Harvard-Smithsonian Center for Astrophysics
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OMI Validation Priorities

• Nitrogen Dioxide (NO2)
• Air pollution, anthropogenic proxy, emission
  estimates
• Sparse correlative data, retrieval challenges
• Ozone (O3)
• Air pollution, health hazard, ozone (hole)
  recovery
• Remaining retrieval challenges (tot-O3C,
  trop-O3C)
• Aerosols
• Air pollution, retrieval challenges, physics of
  aerosols
• Sulphur Dioxide (SO2)
• Air pollution, altitude and emission estimates,
  aviation warning
• Clouds
• Influence to (tropospheric) trace gas retrievals
• Minor trace gases (BrO, OClO, HCHO, CHO-CHO)
• Shortage of correlative data in general