Intercomparison of aerosol extinction profiles retrieved from MAX-DOAS measurements

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Friess , U , Baltink , H K , Beirle , S , Clemer , K , Hendrick , F , Henzing , B , Irie , H , de Leeuw , G , Li , A , Moerman , M M , van Roozendael , M , Shaiganfar , R , Wagner , T , Wang , Y , Xie , P , Yilmaz , S & Zieger , P 2016 , ' Intercomparison of aerosol extinction profiles retrieved from MAX-DOAS measurements ' Atmospheric Measurement Techniques , vol. 9 , no. 7 , pp. 3205-3222 . DOI: 10.5194/amt-9-3205-2016

Title: Intercomparison of aerosol extinction profiles retrieved from MAX-DOAS measurements
Author: Friess, U.; Baltink, H. Klein; Beirle, S.; Clemer, K.; Hendrick, F.; Henzing, B.; Irie, H.; de Leeuw, G.; Li, A.; Moerman, M. M.; van Roozendael, M.; Shaiganfar, R.; Wagner, T.; Wang, Y.; Xie, P.; Yilmaz, S.; Zieger, P.
Contributor: University of Helsinki, Department
Date: 2016
Language: eng
Number of pages: 18
Belongs to series: Atmospheric Measurement Techniques
ISSN: 1867-1381
URI: http://hdl.handle.net/10138/167034
Abstract: A first direct intercomparison of aerosol vertical profiles from Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) observations, performed during the Cabauw Intercomparison Campaign of Nitrogen Dioxide measuring Instruments (CINDI) in summer 2009, is presented. Five out of 14 participants of the CINDI campaign reported aerosol extinction profiles and aerosol optical thickness (AOT) as deduced from observations of differential slant column densities of the oxygen collision complex (O-4) at different elevation angles. Aerosol extinction vertical profiles and AOT are compared to backscatter profiles from a ceilometer instrument and to sun photometer measurements, respectively. Furthermore, the near-surface aerosol extinction coefficient is compared to in situ measurements of a humidity-controlled nephelometer and dry aerosol absorption measurements. The participants of this intercomparison exercise use different approaches for the retrieval of aerosol information, including the retrieval of the full vertical profile using optimal estimation and a parametrised approach with a prescribed profile shape. Despite these large conceptual differences, and also differences in the wavelength of the observed O-4 absorption band, good agreement in terms of the vertical structure of aerosols within the boundary layer is achieved between the aerosol extinction profiles retrieved by the different groups and the backscatter profiles observed by the ceilometer instrument. AOTs from MAX-DOAS and sun photometer show a good correlation (R > 0.8), but all participants systematically underestimate the AOT. Substantial differences between the near-surface aerosol extinction from MAX-DOAS and from the humidified nephelometer remain largely unresolved.
Subject: OPTICAL-ABSORPTION SPECTROSCOPY
RADIATIVE-TRANSFER MODEL
INDEPENDENT DATA SETS
RELATIVE-HUMIDITY
LIGHT-SCATTERING
NITROGEN-DIOXIDE
BOUNDARY-LAYER
MIXING RATIOS
BEIJING AREA
IN-SITU
114 Physical sciences
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