1. TEMIS user workshop, Frascati, 8-9 October 2007 Status of Central European NO 2 products Dominik Brunner, Daniel Schaub, Brigitte Buchmann Empa, Swiss Federal Laboratories for Materials Testing and Research Dübendorf, Switzerland Andrea Petritoli Istituto di Scienze dell'Atmosfera e del Clima, ISAC-CNR Bologna, Italy

2. TEMIS user workshop, Frascati, 8-9 October 2007 Embedding within TEMIS WP 2.2 Global NO 2 product WP 2.3 Regional NO 2 product Global tropospheric NO 2 columns Extract: regional tropospheric NO 2 columns Add: Auxiliary data (Meteo, DOAS) + Validation of regional NO 2 columns End user

3. TEMIS user workshop, Frascati, 8-9 October 2007 Overview of products Region of interest (ROI): Alpine Region and Po valley Product 1: Tailored picture covering the ROI Product 2: Data files (ASCII) for users containing NO 2 column data (pixel values), cloud flag and cloud parameters

4. TEMIS user workshop, Frascati, 8-9 October 2007 Overview of products Product 3: Trajectory calculation* for pixels in ROI (potential source regions)  Trajectory arrival points covering the whole pixel - Analysed wind fields from ECMWF at 6 hr temporal and 1° x 1° geographical resolution - 3-D kinematic 4-day backward trajectories calculated with Lagranto (Wernli and Davies, 1997) Region of interest (ROI): Alpine Region and Po valley *

5. TEMIS user workshop, Frascati, 8-9 October 2007 Overview of products Product 4: Ground-based DOAS NO 2 vertical profiles retrieved at Mt. Cimone and Bologna  Ground-based data in ASCII and images Product 5 Product 5: Validation (for specific periods) with ground-based measurements and meteorological information Petritoli et al. (2004) Region of interest (ROI): Alpine Region and Po valley

6. TEMIS user workshop, Frascati, 8-9 October 2007 Application examples Example 1: Gridded seasonal or (multi-) annual mean distributions GOME 1996-2003 mean clear sky distribution SCIAMACHY 2003-2005 mean clear sky distribution Schaub et al., ACPD 2007

7. TEMIS user workshop, Frascati, 8-9 October 2007 Application examples Example 2: NO x source region attribution Air pollution in Po valley on 23 June 2003

8. TEMIS user workshop, Frascati, 8-9 October 2007 Application examples Example 2: NO x source region attribution Air pollution in Po valley on 23 June 2003: Origin of air arriving in pollution pixels at different levels 800 hPa750 hPa700 hPa 850 hPa900 hPa950 hPa

9. TEMIS user workshop, Frascati, 8-9 October 2007 Application examples Example 2: NO x source region attribution Air pollution in Po valley on 23 June 2003: Maps of residence time of column air in PBL NO 2 VTC < 15 x 10 15 molec/cm 2 NO 2 VTC > 15 x 10 15 molec/cm 2 Hatched areas indicate positions of satellite pixels

10. TEMIS user workshop, Frascati, 8-9 October 2007 Application examples Example 2: NO x source region attribution Air pollution in Po valley on 23 June 2003: Maps of residence time of column air in PBL

11. TEMIS user workshop, Frascati, 8-9 October 2007 Application examples Example 3: Validation of GOME vertical tropospheric NO 2 columns with ground-based in situ measurements.. for TEMIS GOME tropospheric NO 2 columns 1997-2003. Schaub et al. (ACP, 2006) Measurement sites

12. TEMIS user workshop, Frascati, 8-9 October 2007 Status of product availability Product 1: Product 1: tailored picture for each overpass GOME: 01/01 1997 – 21/06 2003, SCIA: 01/01 2003 – 17/09 2006 Product 3: Product 3: Representativity flag and picture of potential source regions GOME: 1997 SCIA: 01/01 2003 – 31/03 2004 Product 4: Product 4: Ground-based DOAS NO 2 vertical profiles from Mt. Cimone and Bologna (ASCII data file, image) and slant column within the tropospheric layer (46 m - 2165 m asl) 2003 Product 5: Product 5: Validation with ground-based measurements and meteorological information (images and quality flags). Three publications (Petritoli et al., 2003; Schaub et al., 2006, 2007) Product 2: Product 2: ASCII data files (regional NO 2 and auxiliary information) GOME: 13/03 1996 – 21/06 2003,SCIA: 07/01 2003 – 30/09 2005 Website moved to: http://temis.empa.ch

13. TEMIS user workshop, Frascati, 8-9 October 2007 Application examples Example 3: Comparison of SCIAMACHY vertical tropospheric NO 2 columns with a high resolution NO x emissions inventory.. for TEMIS SCIAMACHY tropospheric NO 2 columns 2003-2005. Schaub et al. (ACPD, 2007) NOx emissions inventory SCIA pixel