1. BIRA-IASB station report
NORS stands for…
It is an EC FP7 collaborative project involving the following partners
Michel Van Roozendael
NORS/NDACC UV-VIS meeting, Brussels, 3-4 July

2. BIRA-IASB MAXDOAS team
Caroline Fayt
Christian Hermans
François Hendrick
Gaia Pinardi
Alexis Merlaud
Tim Vlemmix
Frederik Tack
Clio Gielen
Michel Van Roozendael
NORS/NDACC UV-VIS meeting, Brussels, 3-4 July

3. BIRA-IASB stations FTIR Uccle (51°N, 4.4°E); 2011 
Harestua (60°N, 11°E); 1994 
Haute Provence (44°N, 5°E); 
Jungfraujoch (46°N, 8°E); 1990 
Beijing/Xianghe (40°N, 115°E); 2008 
Bujumbura (3°S, 30°E); 
Reunion Island (21°S, 55°E); 2002 
NORS stands for…
It is an EC FP7 collaborative project involving the following partners
FTIR
NORS/NDACC UV-VIS meeting, Brussels, 3-4 July

4. Jungfraujoch station (46°N, 8°E)
SAOZ zenith-sky system operated since 1990
Stratospheric NO2 & O3 column monitoring  NDACC
New dual-channel MAXDOAS system installed in July 2010
Direct-sun
Zenith-sky twilight
MAXDOAS
Stratospheric NO2, O3 & BrO
Tropospheric NO2, HCHO, aerosol
Additional (TBC): tropospheric H2O and O3
NORS/NDACC UV-VIS meeting, Brussels, 3-4 July

5. Harestua station (60°N, 11°E)
Dual channel zenith-sky system operated since 1998
Stratospheric NO2, O3 + BrO and OClO (chlorine activation)
Long-term trend of BrO
In preparation:
Installation of new dual channel zenith-sky system, to be upgraded later with MAXDOAS
Instrument under testing at BIRA, to be set-up on site in summer 2012
Overlap operation with old system is planned to minimize risks of discontinuity/bias in the time-series (e.g. BrO)
NORS/NDACC UV-VIS meeting, Brussels, 3-4 July

6. OHP station (44°N, 5°E)
UV zenith-sky system operated since 1998, with focus on BrO monitoring
Upgraded in 2005 to allow for MAXDOAS measurements
Stratospheric BrO and NO2
Tropospheric NO2 and HCHO columns
System does not allow MAXDOAS profile retrievals (pointing accuracy problems at low elevations)
New MAXDOAS system in preparation for replacement in 2013
NORS/NDACC UV-VIS meeting, Brussels, 3-4 July

7. Beijing/Xianghe station (40°N, 115°E)
Dual-channel MAXDOAS system installed in Beijing in summer 2008 during Olympics
Operated for about 10 months
Tropospheric column and profiles of NO2, HCHO, glyoxal, HONO, SO2, aerosol
Stratospheric NO2, O3, BrO
Re-installed in Xianghe (50 km East of Beijing) in January 2010 for long-term operation
2 years of successful operation
NO2, HCHO, HONO, glyoxal, aerosol, SO2, etc
Data exploitation ongoing
NORS/NDACC UV-VIS meeting, Brussels, 3-4 July

8. Uccle station (51°N, 4.4°E)
Hoffman mini-MAXDOAS system installed at RMI in April 2011
Operated for about one year as part of AGACC-2 project
Focus on tropospheric NO2 and aerosol
Complementary measurements available on site:
CIMEL sunphotometer
Brewer spectrophotometer
Regular ozone and meteo sondes
Ceilometer
In-situ NO2 (from Brussels AQ network)
NORS/NDACC UV-VIS meeting, Brussels, 3-4 July

9. Bujumbura station (3°S, 30°E)
New site in project as part of national project AGACC-2
Dual-channel MAXDOAS system, to be installed on the site of the University of Burundi in Bujumbura
Tropospheric NO2, SO2, HCHO, glyoxal, aerosol
Contacts established in May 2012
Plan for installation in December 2012
Cooperation with University of Burundi for joint exploitation of the measurements
NORS/NDACC UV-VIS meeting, Brussels, 3-4 July

10. BIRA-IASB MAXDOAS system
Main parts:
Sun tracker (pointing accuracy < 0.1°)
Telescope (off-axis parabolic mirror)
2 spectrometers
2 cooled low-noise CCDs
2 computers
2 Channels:
UV = nm
VIS = nm
Measurement modes:
Elevation scan
Azimuth scan (almucantar)
Direct-sun capability
NORS/NDACC UV-VIS meeting, Brussels, 3-4 July

11. Spectral coverage and measured species
UV channel O4
SO2
HCHO, HONO O3
BrO
VIS channel O3
H2O
H2O O4
NO2, glyoxal O4 O4 O2
NORS/NDACC UV-VIS meeting, Brussels, 3-4 July

12. Data evaluation tools QDOAS Uvspec/DISORT BePro
generic multi-purpose DOAS retrieval tool developed and maintained by Caroline Fayt
cross-platform compatible software written in C/C++ + QT (GUI)
large distribution (> 100 users worldwide)
Uvspec/DISORT
radiative transfer tool optimised for twilight stratospheric profile retrievals, coupled to 1D photochemical box model PSCBox and SLIMCAT for the initialisation (collaboration with M. Chipperfield)
BePro
LIDORT-based MAXDOAS optimal estimation retrieval tool developed by Katrijn Clémer
Ongoing development with RT-Solutions (R. Spurr)
LIDORT-based twilight tool, with capability to handle 2D photochemical fields, linearised jacobians, and horizontal averaging kernels
NORS/NDACC UV-VIS meeting, Brussels, 3-4 July

13. Ongoing projects and plans
Ongoing MAXDOAS-related R&D projects
FP7 SHIVA, NORS, ACTRIS
national AGACC-2 project
Involvement in satellite validation activities
ESA Multi-TASTE
SQWG (SCIAMACHY Quality Working Group)
ESA Ozone_cci
EUMETSAT O3MSAF (GOME-2 and IASI continuous development and operations)
Future activities
Maintenance and extension of BIRA stations (e.g. Burundi)
Continued development of BIRA retrieval tools
Improvements of operational aspects of the monitoring in support of satellite validation and GMES (NORS)
Continued scientific exploitation of the BIRA data sets, in collaboration with NDACC partners
NORS/NDACC UV-VIS meeting, Brussels, 3-4 July

14. Recent publications of the group
Vigouroux, C. et al., Ground-based FTIR and MAX-DOAS observations of formaldehyde at Réunion Island and comparisons with satellite and model data, Atmos. Chem. Phys., 9, , 2009.
Clémer, K. et al., Multiple wavelength retrieval of tropospheric aerosol optical properties from MAXDOAS measurements in Beijing, Atmos. Meas. Tech., 3, 863–878, 2010.
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, , 2010.
Hendrick, F. et al., NDACC UV-visible total ozone measurements: Improved retrieval and comparison with correlative satellite and ground-based observations, Atmos. Chem. Phys., 11, , doi: /acp , 2011.
Valks, P. et al., Operational total and tropospheric NO2 column retrieval for GOME-2/MetOp, Atmos. Meas. Tech., 4, , doi: /amt , 2011.
Zieger, P. et al., Comparison of ambient aerosol extinction coefficients obtained from in-situ, MAX-DOAS and LIDAR measurements, Atmos. Chem. Phys., 11, , 2011.
Irie, H. et al., Eight-component retrievals from ground-based MAX-DOAS observations, Atmos. Meas. Tech., 4, , doi: /amt , 2011.
Merlaud, A. et al., Airborne DOAS measurements in Arctic: vertical distributions of aerosol extinction coefficient and NO2 concentration, doi: /acp , Atmos. Chem. Phys., 11, 9219–9236, 2011.
Piters, A. et al., The Cabauw Intercomparison campaign for Nitrogen Dioxide measuring Instruments (CINDI): design, execution, and early results, Atmos. Meas. Tech., 5, , doi: /amt , 2012.
Pinardi, G. et al., Intercomparison of Multi-Axis DOAS Formaldehyde slant columns during the CINDI campaign, to be submitted to Atmos. Meas. Tech. (2012)
Hendrick, F., et al., Trend analysis of stratospheric NO2 at Jungfraujoch (46.5°N, 8.0°E) using ground-based UV-visible, FTIR, and satellite nadir observations, Atmos. Chem. Phys. Discuss., 12, , 2012.
NORS/NDACC UV-VIS meeting, Brussels, 3-4 July