OMI Validation Status Mark Kroon - KNMI (on behalf of the OMI validation team) OMI Science Team Meeting Helsinki, 23 June 2008

Dr. Mark Kroon – KNMI - OSTM13 – FinlandSlide 2 JGR Aura Validation Issue Topic# Level 1B3 Aerosols3 Clouds3 Nitrogen Dioxide7 Ozone11 Sulphur Dioxide2 Surface-UV1 VF Delivery1 Total31 31 out of 67 papers related to OMI (on both validation and science)! High quality peer review and web published papers! 10 papers from OMI AO! Balis, Brinksma, Curier, Ionov, Kramer, Krzyścin, Migliorini, Shavrina, Sneep, Tanskanen.

Dr. Mark Kroon – KNMI - OSTM13 – FinlandSlide 3 JGR Aura Validation Issue

Dr. Mark Kroon – KNMI - OSTM13 – FinlandSlide 4 Validation Status COL3 Data ProductReleasedStatus Level 1BPublic Total Column Ozone (TOMS)Public Total Column Ozone (DOAS)Public Aerosol (NASA – AI AOT AAOT)Public Aerosol (KNMI – AOD SSA)Public Nitrogen Dioxide Total ColumnPublic Nitrogen Dioxide tropospheric columnPublic Cloud Height and Fraction O2-O2Public Cloud Height and Fraction RamanPublic Surface-UVPublic Sulphur Dioxide (STL TRM PBL)Public FormaldehydePublic Bromine OxidePublic Chlorine DioxidePublic Ozone ProfileProvisional Validated and Good for Science Validated and Some Problems Validated but Use with Caution Validation Preliminary Not Publicly Available

Dr. Mark Kroon – KNMI - OSTM13 – FinlandSlide 5 Total Ozone Column OMTO3 Image(s) Courtesy : Dr. Dimitris Balis – Aristotle University of Thessaloniki – OMI AO 2925

Dr. Mark Kroon – KNMI - OSTM13 – FinlandSlide 6 Total Ozone Column OMDOAO3 Image(s) Courtesy : Dr. Dimitris Balis – Aristotle University of Thessaloniki – OMI AO 2925

Dr. Mark Kroon – KNMI - OSTM13 – FinlandSlide 7 BrewerDobson /G  (O-G) /G  (O-G) OMI DOAS0.483 %2.754 %0.070 %1.653 % OMI DOAS* %0.200 %0.086 %1.601 % OMI TOMS %2.704 % %1.032 % OMI TOMS* %0.425 % %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 – FinlandSlide 8 Total Ozone Column Total O3 Column Difference for October 2005 OMI TOMS V8.5 - DOAS v1.0.5 [DU]

Dr. Mark Kroon – KNMI - OSTM13 – FinlandSlide 9 OMI – MLS Ozone Profiles Preliminary results for OMI vs MLS ozone profiles Distance < 100 km Same orbit

Dr. Mark Kroon – KNMI - OSTM13 – FinlandSlide 10 OMI – MLS Ozone Profiles Preliminary results for OMI vs MLS ozone profiles Distance < 100 km and Same orbit

Dr. Mark Kroon – KNMI - OSTM13 – FinlandSlide 11 OMI – GOMOS Ozone Profiles Image(s) Courtesy : Dr. Johanna Tamminen - FMI

Dr. Mark Kroon – KNMI - OSTM13 – FinlandSlide 12 Nitrogen Dioxide Total Column Image Courtesy : Dr. Dmitry Ionov – CNRS – OMI AO 2926 SAOZ (ECS2 vs. COL3) for OMI

Dr. Mark Kroon – KNMI - OSTM13 – FinlandSlide 13 Nitrogen Dioxide Tropospheric Column Image Courtesy : Dr. Jennifer Hains – KNMI + OMI pixel < 650 km 2 + OMI pixel > 650 km 2 + SCIAMACHY

Dr. Mark Kroon – KNMI - OSTM13 – FinlandSlide 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 – FinlandSlide 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 – FinlandSlide 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 – FinlandSlide 17 Bromine Oxide Images Courtesy : Dr. Thomas Kurosu – Harvard-Smithsonian Center for Astrophysics

Dr. Mark Kroon – KNMI - OSTM13 – FinlandSlide 18 Formaldehyde Images Courtesy : Dr. Thomas Kurosu – Harvard-Smithsonian Center for Astrophysics

Dr. Mark Kroon – KNMI - OSTM13 – FinlandSlide 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 – FinlandSlide 20 This Meeting