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 2012 1

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 2012 2

BIRA-IASB stations FTIR Uccle (51°N, 4.4°E); 2011  Harestua (60°N, 11°E); 1994  Haute Provence (44°N, 5°E); 1998  Jungfraujoch (46°N, 8°E); 1990  Beijing/Xianghe (40°N, 115°E); 2008  Bujumbura (3°S, 30°E); 2013  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 2012 3

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 2012 4

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 2012 5

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 2012 6

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 2012 7

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 2012 8

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 2012 9

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 = 300 - 390 nm VIS = 400 - 550 nm Measurement modes: Elevation scan Azimuth scan (almucantar) Direct-sun capability NORS/NDACC UV-VIS meeting, Brussels, 3-4 July 2012 10

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 2012 11

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 2012 12

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 2012 13

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, 9523-9544, 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, 1629-1646, 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, 5975-5995, doi:10.5194/acp-11-5975-2011, 2011. Valks, P. et al., Operational total and tropospheric NO2 column retrieval for GOME-2/MetOp, Atmos. Meas. Tech., 4, 1491-1514, doi:10.5194/amt-4-1491-2011, 2011. Zieger, P. et al., Comparison of ambient aerosol extinction coefficients obtained from in-situ, MAX-DOAS and LIDAR measurements, Atmos. Chem. Phys., 11, 2603-2624, 2011. Irie, H. et al., Eight-component retrievals from ground-based MAX-DOAS observations, Atmos. Meas. Tech., 4, 1027-1044, doi:10.5194/amt-4-1027-2011, 2011. Merlaud, A. et al., Airborne DOAS measurements in Arctic: vertical distributions of aerosol extinction coefficient and NO2 concentration, doi:10.5194/acp-11-9219-2011, 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, 457-485, doi:10.5194/amt-5-457-2012, 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, 12357-12389, 2012. NORS/NDACC UV-VIS meeting, Brussels, 3-4 July 2012 14