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Evaluation of sun photometer capabilities for retrievals of aerosol optical depth at high latitudes: the POLAR-AOD intercomparison campaigns
Title: Evaluation of sun photometer capabilities for retrievals of aerosol optical depth at high latitudes: the POLAR-AOD intercomparison campaigns
Authors: Mazzola, MauroStone, Robert S.Herber, AndreasTomasi, ClaudioLupi, AngeloVitale, VitoLanconelli, ChristianToledano, CarlosCachorro, Victoria E.O'Neill, Norman T.Shiobara, MasatakaAaltonen, VeijoStebel, KerstinZielinski, TymonPetelski, TomaszOrtiz de Galisteo, José Pablo ORCID RESEARCHERID Autor AEMETTorres, BenjamínBerjón, AlbertoAutor AEMETGoloub, PhilippeLi, Z.Blarel, LucAbboud, IhabCuevas Agulló, Emilio ORCID RESEARCHERID SCOPUSID Autor AEMETStock, MariaSchulz, Karl-HeinzVirkkula, Aki
Keywords: Aerosol; Polar regions; Sun photometry; Optical depth; Intercomparison; Calibration
Issue Date: 2012
Publisher: Elsevier
Citation: Atmospheric Environment. 2012, 52, p. 4-17
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Abstract: Accuracy requirements for aerosol optical depth (AOD) in polar regions are much more stringent tan those usually encountered in established sun photometer networks, while comparability of data from different archive centres is a further important issue. Therefore, two intercomparison campaigns were held during spring 2006 at Ny-Ålesund (Svalbard) and autumn 2008 at Izaña (Tenerife) within the framework of the IPY POLAR-AOD project, with the participation of various research institutions routinely employing different instrument models at Arctic and Antarctic stations. As reported here, a common algorithm was used for data analysis with the aim of minimizing a large part of the discrepancies affecting the previous studies. During the Ny-Ålesund campaign, spectral values of AOD derived from measurements taken with different instruments were found to agree, presenting at both 500 nm and 870 nm wavelengths average values of root mean square difference (RMSD) and standard deviation of the difference (SDD) equal to 0.003. Correspondingly, the mean bias difference (MBD) varied mainly between _0.003 and þ0.003 at 500 nm, and between _0.004 and þ0.003 at 870 nm. During the Izaña campaign, which was also intended as an intercalibration opportunity, RMSD and SDD values were estimated to be equal to 0.002 for both channels on average, with MBD ranging between _0.004 and þ0.004 at 500 nm and between _0.002 and þ0.003 at 870 nm. RMSD and SDD values for Ångström exponent a were estimated equal to 0.06 during the Ny-Ålesund campaign and 0.39 at Izaña. The results confirmed that sun photometry is a valid technique for aerosol monitoring in the pristine atmospheric turbidity conditions usually observed at high latitudes.
Sponsorship : The Italian research activity was supported by the Programma Nazionale di Ricerche in Antartide (PNRA) and developed as a part of Subproject 2006/6.01: “POLAR-AOD: a network to characterize the means, variability and trends of the climate-forcing properties of aerosols in polar regions”. The GOA-UVA group was funded by MICINN under projects CGL2008-05939-C01/CLI, CGL2009-09740 and CGL2009-09480-E. The Canadian research activity was supported by CANDAC (Canadian Network for the Detection of Atmospheric Change) and their funding organizations: CFCAS (Canadian Foundation for Climate and Atmospheric Sciences, CFI (Canadian Foundation for Innovation), NSERC (National Sciences and Engineering Research Council) and the IPY (NSERC administered) fund. Polish efforts were made within a framework of the POLAR-AOD National Grant.
ISSN: 1352-2310
Appears in Collections:Artículos científicos 2010-2014

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