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Hourly Resolved Cloud Modification Factors in the Ultraviolet : Volume 8, Issue 9 (09/05/2008)

By Staiger, H.

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Book Id: WPLBN0003985639
Format Type: PDF Article :
File Size: Pages 16
Reproduction Date: 2015

Title: Hourly Resolved Cloud Modification Factors in the Ultraviolet : Volume 8, Issue 9 (09/05/2008)  
Author: Staiger, H.
Volume: Vol. 8, Issue 9
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2008
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Bais, A. F., Den Outer, P. N., Feister, U., Vuilleumier, L., Staiger, H., & Johnsen, B. (2008). Hourly Resolved Cloud Modification Factors in the Ultraviolet : Volume 8, Issue 9 (09/05/2008). Retrieved from http://www.ebooklibrary.org/


Description
Description: German Meteorological Service, Freiburg, Germany. Cloud impacts on the transfer of ultraviolet (UV) radiation through the atmosphere can be assessed by using a cloud modification factor (CMF). CMF, which is based on total global solar irradiation (SOLCMF), has proved to be a solid basis to derive CMFs for the UV radiation (UVCMF). This is an advantage, because total global irradiance, the basis for SOLCMF, is frequently measured and forecasted by numerical weather prediction systems and includes all relevant effects for radiation transmission, such as cloud optical depth, different cloud layers, multiple reflection, as well as the distinct difference as to whether the solar disc is obscured by clouds or not. In the UV range clouds decrease the irradiance to a lesser extent than in the visible and infrared spectral range. Thus the relationship between CMFs for solar radiation and for UV-radiation is not straight forward, but will depend on whether, for example, the solar zenith angle (SZA) and wavelength band or action spectrum in the UV have been taken into consideration. Den Outer et al. provide a UVCMF algorithm on a daily basis, which accounts for these influences. It requires as input a daily SOLCMF and the SZA at noon. The calculation of SOLCMF uses the clear-sky algorithm of the European Solar Radiation Atlas to account for varying turbidity impacts. The algorithm's capability to derive hourly UVCMFs based on the SZA at the corresponding hour and its worldwide applicability is validated for erythemal UV using observational data retrieved from the databases of the COST-Action 726 on Long-term changes and climatology of UV radiation over Europe and the USDA UV-B Monitoring Program. The clear-sky part of the models has proved to be of good quality. Accumulated to daily doses it forms a tight cluster of points to the highest measured daily sums. All sky model performances for hourly resolution are shown to be comparable in accuracy with the well performing daily models of the COST-726 model intercomparison.

Summary
Hourly resolved cloud modification factors in the ultraviolet

Excerpt
Bais, A., Topaloglou, C., Kazadtzis, S., Blumthaler, M., Schreder, J., Schmalwieser, A., Henriques, D., and Janouch, M.: Report of the LAP/COST/WMO intercomparison of erythemal radiometers, World Meteorological Organization (WMO), 54 pp., Geneva, 2001.; Bais, A. F., Kazantzidis, A., Kazadzis, S., Balis, D. S, Zerefos, C. S., and Meleti, C.: Deriving an effective aerosol single scattering albedo from spectral surface UV irradiance measurements, Atmos. Environ., 39, 1093–1102, 2005.; Bordewijk, J. A., Slaper, H., Reinen, H. A. J. M., Schlamann, E.: Total solar radiation and the influence of clouds and aerosols on the biologically effective UV, Geophys. Res. Lett., 22, 2151–2154, 1995.; Calbo, J., Pages, D., and Gonzales, J.-A.: Empirical studies of cloud effects on UV radiation: A review, Review of Geophysics 43, RG2002, 1–28, doi: 10.1029/2004RG000155, 2005.; Cede, A., Luccini, E., Nunez, L., Piacentini, R. D., Blumthaler, M., and Herman, J. R.: TOMS-derived erythemal irradiance versus measurements at the stations of the Argentine UV Monitoring Network, J. Geophys. Res., 109, D08109, 1–11, doi: 10.1029/2004JD004519, 2004.; Chen, T., Rossow, W. B., and Zhang, Y.: Radiative Efects of Cloud-Type Variations, J. Climate, 13, 264–286, 2000.; CIE: A reference action spectrum for ultraviolet induced erythema in human skin. CIE Research Note, CIE Journal 6, 17–22, 1987.; Den Outer, P. N., Slaper, H., Matthijsen, J., Reinen, H. A. J. M., and Tax, R.: Variability of Ground-Level Ultraviolet: Model and Measurement, Radiat. Prot. Dosim., 91, 105–110, 2000.; Den Outer, P. N., Slaper, H., and Tax, R. B.: UV radiation in the Netherlands. Assessing long-term variability and trends in relation to ozone and clouds, J. Geophys. Res., 110, D02203, 1–11, doi: 10.1029/2004JD004824, 2005.; Doms, G., and Schättler, U.: LM–Documentation 2nd version, Part II: Physical Parameterization, 1–133, available at http://cosmo-model.cscs.ch/public/documentation.htm, 2003.; Erlick, C., Frederick, J. E., Saxena, V. K., and Wenny, B. N.: Atmospheric transmission in the ultraviolet and visible: Aerosols in cloudy atmospheres, J. Geophys. Res. 103, 31 541–31 556, 1998.; Garane, K., Bais, A. F., Kazadzis, S., Kazantzidis, A., and Meleti, C.: Monitoring of UV spectral irradiance at Thessaloniki (1990-2005): Data re-evaluation and quality control, Ann. Geophys., 24 (12), 3215–3228, 2006.; Greif, J., and Scharmer, K. (ed.): The European Solar Radiation Atlas, Vol. 2: Database, Models and Exploitation Software, École des Mines de Paris, 1–296, France, 2000.; Johnsen, B., Mikkelborg, O., Hannevik, M., Nilsen, L. T., Saxebol, G., and Blaasaas, K. G.: The Norwegian UV Monitoring Network. Period 1995/96 to 2001, Norwegian Radiation Protection Authority, Straalevern Rapport 2002:4, 1–41, 2002.; Joseffson, W., and Landelius, T.: Effect of clouds on UV irradiance: As estimated from cloud amount, cloud type, precipitation, global radiation and sunshine duration, J. Geophys. Res. 105, 4927–4935, 2000.; Koepke, P., Hess, M., Schult, I., and Shettle, E. P.: Global Aerosol Data Set, Max-Planck-Institut für Meteorologie, Report No. 243, 1–44, 1997.; Koepke, P., Bais, A., Balis, D.; Buchwitz, M., De Backer, H., De Cabo, X., Eckert, P., Eriksen, P., Gillotay, D., Heikkilä, A., Koskela, T., Lapeta, B., Litynska, Z., Lorente, J., Mayer, B., Renaud, A., Ruggaber, A., Schauberger, G., Seckmeyer, G., Seifert, P., Schmalwieser, A., Schwander, H., Vanicek, K., and Weber, M.: Comparison of Models Used for UV Index Calculations, Photochem. Photobiol., 67, 657–662, 1998.; Kuchinke, C. and Nunez, M.: Cloud Transmission Estimates of UV-B Erythemal Irradiance, Theor. Appl. Climatol., 63, 149–161, 1999.; Koepke, P., De Backer, H., Bais, A., Curylo, A., Eerme, K., Feister, U., Johnsen, B., Junk, J., Kazantzidis, A., Krzyscin

 

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