Interactive comment on “Improved total atmospheric water vapour amount determination fromnear-infrared filter measurements with sun photometers” by F. Mavromatakis et al
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چکیده
This paper describes an improvement in the derivation of integrated water vapour from sun photometer observations of the atmospheric transmission within a near-infrared wavelength band (̃ 940 nm) characterized by strong water vapour absorption. The improvement is obtained by better accounting for out-of-band (OOB) transmittance of the sun photometer filter. Such contribution is usually neglected. The authors show that this generates a bias on the order of a few percent, which can be avoided by using a modification they propose to the most commonly used technique. I recommend this
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Interactive comment on “Improved total atmospheric water vapour amount determination fromnear-infrared filter measurements with sun photometers” by F. Mavromatakis et al
The referees’ comments are in bold face. Response to Referee 2. We also thank this referee for his/her comments and for pointing out the aerosol channel effect. “I wonder how typical is the problem, what is the rejection rate of the state-ofthe art interference filters. Also how OOB affects other channels used for aerosol optical depth determination and what blocking is sufficient in that case....
متن کاملWater vapour sunphotometry
Improved total atmospheric water vapour amount determination from near-infrared filter measurements with sun photometers F. Mavromatakis, C. A. Gueymard, and Y. Franghiadakis Department of Scienses, Technological Education Institute of Crete, Estavromenos, P.O. Box 1939, 710 04 Heraklion, Crete, Greece Solar Consulting Services, P.O. Box 392, Colebrook, NH 03576, USA Received: 14 March 2007 – A...
متن کاملTechnical Note: Improved total atmospheric water vapour amount determination from near-infrared filter measurements with sun photometers
In this work we explore the effect of the contribution of the solar spectrum to the recorded signal in wavelengths outside the typical 940-nm filter’s bandwidth. We employ gaussian-shaped filters as well as actual filter transmission curves, mainly AERONET data, to study the implications imposed by the non-zero out-of-band contribution to the coefficients used to derive precipitable water from ...
متن کاملInteractive comment on “Aerosol microphysical retrievals from Precision Filter Radiometer direct solar radiation measurements and comparison with AERONET” by S. Kazadzis et al
The authors present results of measurements with a precision filter radiometer and compare their results to collocated measurements carried out with an AERONET (CIMEL) sun photometer. The purpose of the study is to show that the measurements of the precision filter radiometer, which is used by the GAW aerosol network, can be used to extend the data available from AERONET sun photometers. The au...
متن کاملInteractive comment on “Aerosol microphysical retrievals from Precision Filter Radiometer direct solar radiation measurements and comparison with AERONET” by S. Kazadzis et al
The authors present results of measurements with a precision filter radiometer and compare their results to collocated measurements carried out with an AERONET (CIMEL) sun photometer. The purpose of the study is to show that the measurements of the precision filter radiometer, which is used by the GAW aerosol network, can be used to extend the data available from AERONET sun photometers. The au...
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