OMI Validation Status

Mark Kroon - KNMI(on behalf of the OMI

validation team)

OMI Science Team MeetingHelsinki, 23 June 2008

Dr. Mark Kroon – KNMI - OSTM13 – Finland Slide 2

JGR Aura Validation Issue

Topic #Level 1B 3

Aerosols 3

Clouds 3

Nitrogen Dioxide 7

Ozone 11

Sulphur Dioxide 2

Surface-UV 1

VF Delivery 1

Total 31

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, Krzyścin, Migliorini, Shavrina, Sneep, Tanskanen.

Dr. Mark Kroon – KNMI - OSTM13 – Finland Slide 3

JGR Aura Validation Issue

Dr. Mark Kroon – KNMI - OSTM13 – Finland Slide 4

Validation Status COL3

Data Product Released Status

Level 1B Public

Total Column Ozone (TOMS) Public

Total Column Ozone (DOAS) Public

Aerosol (NASA – AI AOT AAOT) Public

Aerosol (KNMI – AOD SSA) Public

Nitrogen Dioxide Total Column Public

Nitrogen Dioxide tropospheric column Public

Cloud Height and Fraction O2-O2 Public

Cloud Height and Fraction Raman Public

Surface-UV Public

Sulphur Dioxide (STL TRM PBL) Public

Formaldehyde Public

Bromine Oxide Public

Chlorine Dioxide Public

Ozone Profile Provisional

Validated and Good for Science

Validated and Some Problems

Validated butUse with Caution

Validation Preliminary

Not Publicly Available

Dr. Mark Kroon – KNMI - OSTM13 – Finland Slide 5

Total Ozone Column OMTO3

Image(s) Courtesy : Dr . Dimitris Balis – Aristotle University of Thessaloniki – OMI AO 2925

Dr. Mark Kroon – KNMI - OSTM13 – Finland Slide 6

Total Ozone Column OMDOAO3

Image(s) Courtesy : Dr . Dimitris Balis – Aristotle University of Thessaloniki – OMI AO 2925

Dr. Mark Kroon – KNMI - OSTM13 – Finland Slide 7

Brewer Dobson

<O-G>/G (O-G) <O-G>/G (O-G)

OMI DOAS 0.483 % 2.754 % 0.070 % 1.653 %

OMI DOAS* -0.555 % 0.200 % 0.086 % 1.601 %

OMI TOMS -0.504 % 2.704 % -0.631 % 1.032 %

OMI TOMS* -1.450 % 0.425 % -0.645 % 1.064 %

* No South Pole (lat > 75 S)

Ground Based Validation

Data Courtesy : Dr . Dimitris Balis – Aristotle University of Thessaloniki – OMI AO 2925

Dr. Mark Kroon – KNMI - OSTM13 – Finland Slide 8

Total Ozone Column

Total O3 Column Difference for October 2005

OM

I TO

MS V

8.5

- D

OA

S v

1.0

.5 [

DU

]

Dr. Mark Kroon – KNMI - OSTM13 – Finland Slide 9

OMI – MLS Ozone Profiles

Preliminary results forOMI vs MLS ozone profiles

Distance < 100 kmSame orbit

Dr. Mark Kroon – KNMI - OSTM13 – Finland Slide 10

OMI – MLS Ozone Profiles

Preliminary results for OMI vs MLS ozone profilesDistance < 100 km and Same orbit

Dr. Mark Kroon – KNMI - OSTM13 – Finland Slide 11

OMI – GOMOS Ozone Profiles

Image(s) Courtesy : Dr . Johanna Tamminen - FMI

Dr. Mark Kroon – KNMI - OSTM13 – Finland Slide 12

Nitrogen Dioxide Total Column

Image Courtesy : Dr. Dmitry Ionov – CNRS – OMI AO 2926

SA

OZ

(EC

S2 v

s. C

OL3

) fo

r O

MI 2004-2

007

Dr. Mark Kroon – KNMI - OSTM13 – Finland Slide 13

Nitrogen Dioxide Tropospheric Column

Image Courtesy : Dr. Jennifer Hains – KNMI

+ OMI pixel < 650 km2

+ OMI pixel > 650 km2

+ SCIAMACHY

Dr. Mark Kroon – KNMI - OSTM13 – Finland Slide 14

Aerosols Optical Depth

Images Courtesy : Dr. Omar Torres – Hampton

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.”

Dr. Mark Kroon – KNMI - OSTM13 – Finland Slide 15

Aerosols Optical Depth

Images Courtesy : Dr. Remco Braak – KNMI

OMI data is land only and ‘MODIS cloud fraction screened’ 'Q12' means using monthly mean surface reflectivity data [Quintus Kleipool (KNMI)].

'Q12'

Dr. Mark Kroon – KNMI - OSTM13 – Finland Slide 16

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 ( < 50 DU). Main problem is guessing SO2 altitude.

Add 2: Current volcanic data will underestimate SO2 for large eruptions (> 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

Dr. Mark Kroon – KNMI - OSTM13 – Finland Slide 17

Bromine Oxide

Images Courtesy : Dr. Thomas Kurosu – Harvard-Smithsonian Center for Astrophysics

Dr. Mark Kroon – KNMI - OSTM13 – Finland Slide 18

Formaldehyde

Images Courtesy : Dr. Thomas Kurosu – Harvard-Smithsonian Center for Astrophysics

Dr. Mark Kroon – KNMI - OSTM13 – Finland Slide 19

Chlorine Dioxide

Images Courtesy : Dr. Thomas Kurosu – Harvard-Smithsonian Center for Astrophysics

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" …

Dr. Mark Kroon – KNMI - OSTM13 – Finland Slide 20

Validation @ This Meeting