TEMIS user workshop, Frascati, 8-9 October 2007 Monitoring of Transatlantic Long Range Transport of Tropospheric NO 2 – Observation and Simulation Bas.

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Presentation transcript:

TEMIS user workshop, Frascati, 8-9 October 2007 Monitoring of Transatlantic Long Range Transport of Tropospheric NO 2 – Observation and Simulation Bas Mijling Bart Dils Ronald van der A Ruud Dirksen

TEMIS user workshop, Frascati, 8-9 October 2007 Part 1 Observation

TEMIS user workshop, Frascati, 8-9 October 2007 Why tropospheric NO 2 ? – Relatively easy to measure – Relation with tropospheric O 3 Why OMI? – Daily global coverage; high resolution Why Atlantic region? – Predominant westerly winds transport air pollutants from East US to West Europe Observation LRT with satellites

TEMIS user workshop, Frascati, 8-9 October 2007 Basic mechanism of long range transport 1. Rapid uplift 2. Fast horizontal transport East Asian outflow of tropospheric NO 2 observed by OMI 26 May 2007

TEMIS user workshop, Frascati, 8-9 October 2007 Shielding effects of clouds NO 2 ghost column NO 2 above the clouds troposph. NO 2 column Surf. albedo 0.02 Cloud at 800 hPa

TEMIS user workshop, Frascati, 8-9 October 2007 Event I: Transatlantic NO 2 transport

TEMIS user workshop, Frascati, 8-9 October Event II: Transatlantic NO 2 transport

TEMIS user workshop, Frascati, 8-9 October Event III: Backflow from Europe

TEMIS user workshop, Frascati, 8-9 October Event IV: Forest fires on the Canaries

TEMIS user workshop, Frascati, 8-9 October 2007 Data quality: OMI collection 3 -Level 0-1: Improved dark current correction -Level 1-2: Averaged solar irradiance spectrum -Improved signal to noise ratio (noise floor now at ~ molec/cm 2 ) -No cross-track gradient (no artifacts at overlapping tracks) -Still some striping problem (to be corrected for with filter) Collection 2Collection 3

TEMIS user workshop, Frascati, 8-9 October 2007 Part 2 Observation & Simulation

TEMIS user workshop, Frascati, 8-9 October 2007 OMI observation / FLEXPART simulation Flexpart, 14 Jan 2007OMI, 14 Jan 2007 OMI less sensitive to NO 2 in lower troposphere

TEMIS user workshop, Frascati, 8-9 October 2007 OMI observation / FLEXPART simulation Flexpart, 6 Jan 2007OMI, 6 Jan 2007

TEMIS user workshop, Frascati, 8-9 October Height dependency - Frequency (seasonality) - Quantify transport

TEMIS user workshop, Frascati, 8-9 October 2007 Future activities Reprocessing OMI data using collection 3 Implementation destriping filter New data-format (HDF5 instead of ASCII) Other areas (East Asia, South Africa, …) Other satellite instruments (GOME-2) Quantifying transport Correlation with background stations

TEMIS user workshop, Frascati, 8-9 October 2007 Thank you for your attention! See you at: