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BREDOM network– Overview and Plans

Folkard Wittrock, iup Bremen

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Bremian DOAS network for atmospheric measurements (BREDOM)

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BREDOMPermanent Stations:Ny-Ålesund (79°N) : since 1995 (2002)Bremen (53°N) : since 1993 (2004)Heraklion (35°N) : since August 2007Mérida (8°N) : March 2004 to Mai 2009Nairobi (1°S) : July 2002 to September 2010Campaigns 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 – 07.2003Summit (Greenland): 08.2003 – 03.2005Sylt (Germany) : 03. – 09.2004Cabauw (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

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CINDI campaign 2009Roscoe et al., 2010

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CINDI campaign 2009Roscoe et al., 2010

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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)

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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

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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, NO2, BrO, OClO, tropospheric IO, BrO, in case of local pollution events (ship emissions) NO2, HCHO, and CHOCHO)

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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. NO2 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

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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-shadedarea:

potential vorticity

Ny-Ålesund

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BREDOM – Ny-Ålesund

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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, NO2, BrO, (OClO), tropospheric NO2, HCHO, CHOCHO

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BREDOM – Bremen

1st Workshop on MAX-DOAS observations over East Asia and Russia 8-9 February 2010, Yokohama

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BREDOM – Bremen

In situ vs. MAX-DOAS 2010•Correlation 0.68•Slope 1.2•In situ affected by interference?

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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, NO2, BrO, tropospheric NO2, HCHO, CHOCHO due to local pollution and biomass burning plumes

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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, NO2, and in case of biomass burning plumes HCHO

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Different viewing angles show different HCHO slant columns -> from that HCHO profiles can be retrieved

BREDOM – Mérida (Venezuela)

HCHO in free troposphere

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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)

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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, NO2, BrO, tropospheric NO2, HCHO, CHOCHO due to local pollution and biomass burning plumes (very rare)

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BREDOM – Nairobi

Correlation between wind direction and NO2 surface