Cloud detection by inversion of MAX-DOAS measurements


Contact
Gert.Koenig-Langlo [ at ] awi.de

Abstract

Multi-Axis Differential Optical Absorption Spectroscopy (MAXDOAS)is a widely used technique for the detection of atmospheric trace gases, e.g. NO2, SO2, but also for the oxygen collision complex O4, whose atmospheric distribution is well known. By comparing measured O4 differential slant column densities (dSCDs) with modelled ones, information on aerosol distributions and optical properties can be gained. In combination with a radiative transfer model, an inversion of measured dSCDs allows the retrieval of vertical aerosol extinction profiles and properties. Here the ability of MAX-DOAS observations to detect cloud altitude and cloud optical properties of different cloud covers will be discussed. An accurate retrieval of these parameters is crucial for an interpretation of trace gas dSCDs and a subsequent retrieval of vertical profiles from MAX-DOAS measurements under cloudy conditions. The ability of MAX-DOAS to retrieve cloud layer height and optical properties will be demonstrated with a comparison to co-located measurements of a commercial Ceilometer during several cruises of the German research vessel Polarstern. Advantages, limitations and possible applications of the technique will be discussed.



Item Type
Conference (Conference paper)
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Peer revision
Not peer-reviewed
Publication Status
Published
Event Details
DPG-Frühjahrstagung der Sektion AMOP, Heidelberg15, 23 Mar 2015 - 27 Mar 2015, Universität Heidelberg, Deutschland.
Eprint ID
39161
Cite as
Nasse, J. M. , Zielcke, J. , Friess, U. , Lampel, J. , König-Langlo, G. and Platt, U. (2015): Cloud detection by inversion of MAX-DOAS measurements , DPG-Frühjahrstagung der Sektion AMOP, Heidelberg15, Universität Heidelberg, Deutschland, 23 March 2015 - 27 March 2015 .


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