NDACC UV/VIS campaign in Andoya

Within the NDACC framework, BIRA-IASB participated to several UV/VIS intercomparison campaigns: Lauder (45°S, 170°E; New Zeeland) in May 1992 (Hofmann et al., 1995), Observatoire de Haute Provence (44°N, 6°E; France) in June 1995 (Roscoe et al., 1999), both with focus on stratospheric NO2.

The last one, is a high latitude intercomparison campaign that took place in Andoya (Norway) in Feb/March 2003, when the NO2 columns are expected to be minimum in the denoxified polar vortex.

Description of the campaign

The intercomparison campaign of ground-based zenith-sky viewing UV-visible spectrometers was held at the Andøya Rocket Range (69°N, 16°E) at Andenes, Norway, from February 12 to March 8, 2003. The site is a complementary NDACC site. Eight groups from seven countries participated in the campaign which focused on the measurements of slant columns of NO2, BrO, and OClO. A detailed description of the campaign can be found in Vandaele et al. 2005.

BIRA-IASB instruments

BIRA-IASB operated two instruments: MAXDOAS UV/VIS (335-450 nm) MAXDOAS UV (334-395 nm) with main focus on: NO2, BrO, OClO.

Intercomparison results for NO2 are reviewed in Vandaele et al. 2005. Considering the data obtained during the whole campaign for solar zenith angles between 75° and 95°, all instruments agreed within 5% in the case of NO2 (with imposed analysis parameters in the 425–450 nm region).

List of publications

Hofmann, D., et al. (1995), Intercomparison of UV/visible spectrometers for measurements of stratospheric NO2 for the Network for the Detection of Startospheric Change, J. Geophys. Res., 100, 16,765– 16,791.

Roscoe, H. K., et al. (1999), Slant column measurements of O3 and NO2 during the NDSC intercomparison of zenith-sky UV-Visible spectrometers in June 1996, J. Atmos. Chem., 32, 281–314.

Vandaele, A. C., et al. (2005), An intercomparison campaign of ground-based UV-visible measurements of NO2, BrO, and OClO slant columns: Methods of analysis and results for NO2, J. Geophys. Res., 110, D08305, doi:10.1029/2004JD005423.