1. BREDOM BREDOM network– Overview and Plans Folkard Wittrock, iup Bremen

2. BREDOM Bremian DOAS network for atmospheric measurements (BREDOM)

3. BREDOM BREDOM Permanent Stations: Ny-Ålesund (79°N): since 1995 (2002) Bremen (53°N) : since 1993 (2004) Heraklion (35°N): since August 2007 Mérida (8°N): March 2004 to Mai 2009 Nairobi (1°S) : July 2002 to September 2010 Campaigns and temporary stations: OHP (France) : 06. – 07. 1996 (NDACC intercomparison) Kaashidhoo (Maledive): 02. – 03.1998 (INDOEX) Po valley (Italy): 07. – 08.2002 and 08. – 09.2003 (FORMAT) Andoya (Norway): 02. – 03.2003 (NDACC intercomparison) Zugspitze (Germany): 02.2003 – 07.2003 Summit (Greenland): 08.2003 – 03.2005 Sylt (Germany): 03. – 09.2004 Cabauw (Netherlands) : 06. – 07.2005, 09.2006 (DANDELIONS) and 06. – 07.2009 (CINDI, NDACC intercomparison) RV Polarstern: 08.-10.2006 (ANTXXIII-7) and 04.-05.2008 (ANTXXIV-4) RV Sonne:: 10.2009 (TRANSBROM) Finokalia (Crete): 06.2007 – 08.2007 NDACC qualified instruments all stations equipped with MAX-DOAS

4. BREDOM CINDI campaign 2009 Roscoe et al., 2010

5. BREDOM CINDI campaign 2009 Roscoe et al., 2010

6. BREDOM Outlook New telescope head for all sites Possible new stations: Guam: 13°N, 145°E in West Pacific, cooperation with AWI Potsdam, focus on marine chemistry, transport from ocean to stratosphere, very often low ozone Manaus: 3°S, 60°W, Brazil, forest station, cooperation with University of Sao Paulo, focus on biogenic emissions, biomass burning (-> HCHO, CHOCHO) Shiva campaign around Borneo in 2011 Development of new MAX-DOAS system for Deutsche Bucht (cooperation with BSH)

7. BREDOM References to BREDOM Roscoe, H. K., et al.: Intercomparison of slant column measurements of NO2 and O4 by MAX- DOAS and zenith-sky UV and visible spectrometers, Atmos. Meas. Tech., 3, 1629-1646, doi:10.5194/amt-3-1629-2010, 2010 Hains, J.C., et al., Testing and improving OMI DOMINO tropospheric NO2 using observations from the DANDELIONS and INTEX-B validation campaigns, J. Geophys. Res., 115, D05301, doi:10.1029/2009JD012399, 2010 Ferrari, C. P., et al., Atmospheric mercury depletion event study in Ny-Alesund (Svalbard) in spring 2005. Deposition and transformation of Hg in surface snow during springtime, Science of the Total Environment, 397,167-177, 2008 Brinksma, E., et l., The 2005 and 2006 DANDELIONS NO2 and Aerosol Intercomparison Campaigns, J. Geophys. Res., 113, D16S46, doi:10.1029/2007JD008808, 2008. Schönhardt, A., et al., Observations of iodine monoxide columns from satellite, Atmos. Chem. Phys., 8, 637-653, 2008 Fietkau, S., et al., Ground-based measurements of tropospheric and stratospheric bromine monoxide above Nairobi (1° S, 36° E), Atmos. Chem. Phys. Discuss., 7, 6527-6555, 2007 Sommar, J., et al., Circumpolar transport and air-surface exchange of atmospheric mercury at Ny- Ålesund (79° N), Svalbard, spring 2002, Atmos. Chem. Phys., 7, 151-166, 2007 Wittrock, F., et al., Simultaneous global observations of glyoxal and formaldehyde from space, Geophys. Res. Lett., 33, L16804, doi:10.1029/2006GL026310, 2006 Heckel, A., et al., MAX-DOAS measurements of formaldehyde in the Po-Valley, Atmos. Chem. Phys., 5, 909–918, 2005 Wittrock, F., et al., MAX-DOAS measurements of atmospheric trace gases in Ny-Ålesund - Radiative transfer studies and their application, Atmos. Chem. Phys., 4, 955-966, 2004

8. BREDOM BREDOM – Ny-Ålesund Ny-Ålesund (79° N, 12° E, 15 m asl) first test of off-axis in April 1998 MAX-DOAS since 1999 (2 directions) since March 2002 several LOS (scanning), different azimuth from 2010 onwards One Acton and one Oriel spectrometer with Andor CCD‘s covering 320 – 570 nm Very clean site -> mainly validation of stratospheric absorbers, but also retrieval of halogen oxides (e.g. during LOE‘s (low ozone events) Measurements of ozone, NO 2, BrO, OClO, tropospheric IO, BrO, in case of local pollution events (ship emissions) NO2, HCHO, and CHOCHO)

9. BREDOM BREDOM – Ny-Ålesund in high latitudes, GOME-2 and SCIAMACHY provide up to 12 measurements per day this facilitates observation of diurnal variation of e.g. NO 2 and opens new possibilities for validation GOME-2 and SCIAMACHY measurements within 200 km scatter as result of varying SZA zenith-sky and nadir AMF are comparable

10. BREDOM BREDOM – Ny-Ålesund Ground-based, satellite and model OClO at the time of overflight of the satellite Excellent agreement, see Oetjen et al., 2009 black line: temperature gray-shaded area: potential vorticity Ny-Ålesund

11. BREDOM BREDOM – Ny-Ålesund

12. BREDOM BREDOM – Bremen Bremen (53° N, 9° E, 30 m asl) MAX-DOAS since 2000 (2 directions) since October 2002 scanning Urban site Two Acton spectrometer with Roper CCD‘s covering 325 – 570 nm Measurements of ozone, NO 2, BrO, (OClO), tropospheric NO 2, HCHO, CHOCHO

13. BREDOM BREDOM – Bremen 1 st Workshop on MAX-DOAS observations over East Asia and Russia 8-9 February 2010, Yokohama

14. BREDOM BREDOM – Bremen In situ vs. MAX-DOAS 2010 Correlation 0.68 Slope 1.2 In situ affected by interference?

15. BREDOM BREDOM – Heraklion (Crete) Heraklion (32° N, 25° E, 115 m asl) MAX-DOAS since 2007 2 spectrometer (Acton with Roper-CCD, Oriel with Andor-CCD) covering 325 – 560 nm Moderately polluted Measurements of ozone, NO 2, BrO, tropospheric NO 2, HCHO, CHOCHO due to local pollution and biomass burning plumes

16. BREDOM BREDOM – Mérida (Venezuela) Merida (8° N, 71° W, 4800 asl) setup in March 2004 one spectrometer covering 325 – 410 nm free troposphere or upper edge of boundary layer measurements of ozone, NO 2, and in case of biomass burning plumes HCHO

17. BREDOM Different viewing angles show different HCHO slant columns -> from that HCHO profiles can be retrieved BREDOM – Mérida (Venezuela) HCHO in free troposphere

18. BREDOM Formaldehyde volume mixing ratios close to the measurement site in Mérida correlates well with the monthly mean fire counts above the Llanos in Venezuela. Due to the prevailing wind direction (East) air masses from the biomass burning regions could be detected from the MAX-DOAS instrument BREDOM – Mérida (Venezuela)

19. BREDOM BREDOM – Nairobi Nairobi (1° S, 37° E, 1625 m asl) MAX-DOAS since 2002 2 spectrometer (Oriel with Andor-CCD‘s) covering 325 – 565 nm Semi-urban, moderate polluted Measurements of ozone, NO 2, BrO, tropospheric NO 2, HCHO, CHOCHO due to local pollution and biomass burning plumes (very rare)

20. BREDOM BREDOM – Nairobi Correlation between wind direction and NO 2 surface