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Tropospheric NO 2 measured by satellites — closing remarks —

Tropospheric NO 2 measured by satellites — closing remarks —. Retrieval of trop NO 2 has evolved considerably over the past eleven years Large differences remain In spite of that, trop NO 2 is used successfully in many applications Much more data is available with OMI and now also GOME-2

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Tropospheric NO 2 measured by satellites — closing remarks —

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  1. Tropospheric NO2 measured by satellites— closing remarks — • Retrieval of trop NO2 has evolved considerably over the past eleven years • Large differences remain • In spite of that, trop NO2 is used successfully in many applications • Much more data is available with OMI and now also GOME-2 • We want to understand the differences, in order to: • improve the retrieval • know how we can use the data in applications • Estimate uncertainties and their characteristics • optimise future satellite missions Tropospheric NO2 measured by satellites

  2. Tropospheric NO2 measured by satellites— Main recommendations and follow-up activities — • Intercomparison of different retrieval methods. Objective: to understand and quantify the effect of the different retrieval choices on trop NO2 values and accuracies. Organisation: • Slant columns: retrieval groups • Final product, incl AMFs: Ron Cohen • Need for high spatial resolution input of surface albedo, aerosol, clouds, surface pressure/terrain height into the retrieval • Validation campaign to assess the accuracy of (mini-) MAXDOAS and NO2 lidar. This should include accurate in-situ tropospheric profiles, which we don't have yet! (Folkard Wittrock / Ankie Piters) Tropospheric NO2 measured by satellites

  3. Tropospheric NO2 measured by satellites— Main recommendations and follow-up activities — • Make all validation data easily accessible • Provide harmonized NO2 data sets based on existing networks (GEOMON) • Recommend use of remote sensing instruments (e.g. MAXDOAS) in existing airquality networks. • Provide Averaging Kernel in satellite products and make use of it • Better assess uncertainty in top-down emission estimates(uncertainties both due to model and retrieval errors).Investigate implications of limited model resolution, e.g. onNO2-OH coupling relevant for NO2 lifetime • Exploiting the higher spatial resolution possible with OMI (down to 5km) Tropospheric NO2 measured by satellites

  4. Thanks • ACCENT-AT2 for supporting the event • Co-organisers: Steffen Beirle Andreas Richter Dominik Brunner Pepijn Veefkind • Local organisation and assistance: Jan Wuite Tim Vlemmix Marc Allaart Wesley Sluis Melinda van Nimwegen Tropospheric NO2 measured by satellites

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