Differential Optical Absorption Spectrometer

Updated 2003-06-19

The DOAS instrument consists of grating spectrometer covering the visible and near ultraviolet spectral region. Zenith-scattered sunlight is collected by simple one-lens telescopes and fed via optical fiber bundles into the spectrometers, where atmospheric absorption spectra are obtained. The instrument runs automatically. Total column densities of the stratospheric trace species ozone, NO2, BrO, and OClO are retrieved from the spectra using the DOAS algorithm. These are species that play a major role in ozone chemistry, either by themselves in ozone destruction (BrO) or as indicators of chlorine activation/deactivation (OClO). The chemistry and dynamics of ozone destruction is investigated, e.g. with respect to the location of the polar vortex during the winter. The instrument is also useful for detection of polar stratospheric clouds using the zenith-sky colour index method.

This is not a National Implementation Plan (NIP) project

http://alis.irf.se/~fredrik/hut2/

Comments and additional information:

Instrument is operated in close collaboration with the university of Heidelberg.

Status: Ongoing
Project time span: 1996 - 2020
Data collection: 1996 - 2003
Data processing: 1996 - 2003
Data reporting: 1996 - 2003

Contact information

Contact person: Uwe Raffalski
Address: Swedish Institute of Space Physics Box 812 981 28 Kiruna Sweden
Phone: +46 980 79021
Fax: +46 980 79050
Email: es.fri@ikslaffaR.ewU
Other project contacts: Carl-Fredrik Enell collaborating institute Udo Friess Atmospheric research group University of Heidelberg Im Neuenheimer Feld 229 69120 Heidelberg Tel: +49 6221 54-6350 Fax: +49 6221 54-6405

Parameters and Media

Parameter groups measured/observed/modelled

Other metals/elements

Media sampled/studied/modelled

Air/aerosol

Geography

Regions studied: Other metals/elements; Other metals/elements; Other metals/elements; Other metals/elements; Other metals/elements

Data availability

Are data archived or planned to be archived at an AMAP Thematic Data Centre?: no
If no (or only part of data are reported to a TDC), where and how are (other) data stored?: Evaluated data for the SOLVE/Theseo 2000 winter are available in NILU's database. Data can be provided on request after an agreement on the use of the data has been made.
References to key publications (or planned publications) and data reports: http://www.alis.irf.se/~fredrik/publications/

Samples/specimens archived in specimen banks?: No

Methods & Procedures

Procedures and methodology used for, e.g., sampling and sample storage, sample pretreatment, extraction and analysis, including which laboratories are involved, references to methods employed, etc.: The DOAS instrument consists of grating spectrometers covering the visible and near ultraviolet spectral region. Zenith-scattered sunlight is collected by simple one-lens telescopes and fed via optical fiber bundles into the spectrometers, where atmospheric absorption spectra are obtained.

Additional Information

Is this a bi- AND multi-lateral project (i.e. a project involving cooperation between different countries)?: Yes
Other institutes involved in the project: University of Heidelberg
Is this project reporting to other organizations/programmes?: Evaluated data for the SOLVE/Theseo 2000 winter are available in NILU's database.