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Estimation of photolysis frequencies from TOMS satellite measurements and routine meteorological observations

Topaloglou, C. and Mayer, Bernhard and Kazadzis, S. and Bais, A.F. and Blumthaler, M. (2008) Estimation of photolysis frequencies from TOMS satellite measurements and routine meteorological observations. Annales Geophysicae, 26, pp. 1965-1975.

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Abstract

A study on the estimation of J(O1D) and J(NO2) photolysis frequencies when limited ground based measurements (or even no measurements at all), are available is presented in this work. Photolysis frequencies can be directly measured by chemical actinometry and filter radiometry or can be calculated from actinic flux measurements. In several meteorological stations, none of the methods above are applicable due to the absence of sophisticated instruments such as actinometers, radiometers or spectroradiometers. In this case, it is possible to calculate photolysis frequencies with reasonable uncertainty using either a) standard meteorological observations, such as ozone, cloud coverage and horizontal visibility, available in various ground based stations, as input for a radiative transfer model or b) satellite observations of solar global irradiance available worldwide, in combination with an empirical method for the conversion of irradiance in photolysis frequencies. Both methods can provide photolysis frequencies with a standard deviation between 20% and 30%. The absolute level of agreement of the retrieved frequencies to those calculated from actual actinic flux measurements, for data from all meteorological conditions, is within ±5% for J(O1D) and less than 1% for J(NO2) for the first method, while for the second method it rises up to 25% for the case of J(O1D) and 12% for J(NO2), reflecting the overestimation of TOMS satellite irradiance when compared to ground based measurements of irradiance for the respective spectral regions. Due to the universality of the methods they can be practically applied to almost any station, thus overcoming problems concerning the availability of instruments measuring photolysis frequencies.

Document Type:Article
Title:Estimation of photolysis frequencies from TOMS satellite measurements and routine meteorological observations
Authors:
AuthorsInstitution or Email of Authors
Topaloglou, C.Aristotle Univ. of Thessaloniki, GR
Mayer, BernhardUNSPECIFIED
Kazadzis, S.Aristotle Univ. of Thessaloniki, GR
Bais, A.F.Aristotle Univ. of Thessaloniki, GR
Blumthaler, M.Medical Univ. of Innsbruck, A
Date:2008
Journal or Publication Title:Annales Geophysicae
Refereed publication:Yes
In Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:26
Page Range:pp. 1965-1975
Status:Published
Keywords:ultraviolet radiation, radiative transfer, photochemistry
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Remote Sensing
Deposited By: Dr.rer.nat. Bernhard Mayer
Deposited On:08 Sep 2008
Last Modified:20 Oct 2014 14:32

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