Multi-Axis Differential Optical Absorption
Remotely sensing the tropospheric composition from ground-based, aircraft and satellite platforms is a challenge at the forefront of atmospheric science. Multiple Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) offers a new opportunity to develop ground and airborne observations of key tropospheric pollutants. The Concurrent Multi-Axis Differential Optical Absorption Spectroscopy (CMAX-DOAS ) system at the University of Leicester measures concentrations of trace gas species from several viewing geometries simultaneously. This is achieved through the imaging of multiple telescope inputs onto a CCD chip, giving an instrument that offers temporal resolution of a minute or less.
This project involves the technical and scientific development of the CMAX-DOAS system to detect UV and visible radiation on spatial and temporal scales that are beyond the current scope of ground and space-based instruments. The main target gas species are nitrogen dioxide (NO2), formaldehyde (HCHO) and glyoxal (CHOCHO), which contribute to urban pollution. Other gas species that may also be measured are iodine monoxide (IO) in the marine boundary layer and ozone (O3). The results from this project will contribute to the validation of satellite instruments as part of OMIVAL and the ACCENT-TROPOSAT-2 (AT2) project.
A good introduction to CMAX-DOAS measurements in urban environments - Poster presented at a recent postgraduate festival by Louisa Kramer.
R. J. Leigh, P.S. Monks
Trends in Analytical Chemistry, 24, 9, pp v-viiii, 2005
City Scale Air Pollution Measured For The First Time
L.Kramer, R. Leigh and P. S. Monks, "Remote sensing of tropospheric gas species by CMAX-DOAS", Accent Symposium, 2005
L.Kramer, R. Leigh, P. S. Monks, G. Corlett "Concurrent Multi-Axis DOAS measurements of tropospheric gas species", Faraday Discussion:130, Leeds, UK, April 2005.
L.Kramer, R. Leigh and P. S. Monks "Measuring tropospheric pollutants in an urban environment", Postgraduate Research Festival, Leicester, UK, May 2005.
L.Kramer, R. Leigh, G. Corlett and P. S. Monks "Comparison of CMAX-DOAS, in situ and satellite retrievals of NO2 in an urban environment", Third International DOAS Workshop, Uni. Bremen, Germany, March 2006.
L.Kramer, R. Leigh and P. S. Monks "A comparison of CMAX-DOAS measurements and satellite retrievals of NO2 in an urban environment", Atmospheric Science Conference, Frascati, Italy , May 2006.
L.Kramer, R. Leigh and P. S. Monks "Validation of NO2 measurements from satellites", 5th AT2 workshop, Heraklion, Crete, April 2006.
L.Kramer, R. Leigh and P. S. Monks "Validation of tropospheric NO2 measurements from OMI, over Leicester, U.K., OMI science team meeting no. 11, KNMI, De Bilt, Netherlands, June 2006.
L.Kramer, R. Leigh and P. S. Monks "Measuring air quality from space", DIAC Tropospheric Composition Meeting, Leicester, UK, November 2006.
U. Frieß, P. S. Monks, J. J. Remedios, A. Rozanov, R. Sinreich, T. Wagner, U. Platt
Journal Of Geophysical Research, 111, D14203, doi:10.1029/2005JD006618, 2006
MAX-DOAS O4 measurements: A new technique to derive information on atmospheric aerosols: 2. Modeling studies