Local cloud cover,ground-based and satellite measurements of erythemal dose rate for an urban,tropical site in Southern Hemisphere |
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| Authors: | A.A. Silva |
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| Affiliation: | 1. National Atmospheric Research Laboratory, Gadanki, 517 112, Pakala Mandal, Chittoor District, India;2. Department of Meteorology and Oceanography, Andhra University, Visakhapatnam, 530003, India;1. European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra, Italy;2. European Academy of Bolzano, Bolzano, Italy;1. Department of Astronomy and Space Science, Chungnam National University, 99 Daehak-ro (St), Yuseong-gu, Daejeon 305-764, Republic of Korea;2. Korea Polar Research Institute, 26, Songdomirae-ro (St), Yeonsu-gu, Incheon 406-840, Republic of Korea;3. Wyle IS/National Space Science Data Center, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA;4. NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA;1. Space Research Institute, Russian Academy of Sciences, Profsoyuznaya st., 84/32, Moscow 117997, Russia;2. Moscow State University, Sternberg Astronomical Institute, Universitetskii prosp., 13, Moscow 119991, Russia;1. South African Weather Service, Private Bag X097, Pretoria, Gauteng, 0001, South Africa;2. School of Chemistry and Physics, University of KwaZulu-Natal, Durban, 4000, South Africa;3. Remote Sensing and Environmental Geophysics Laboratory, Institute & Observatory of Geophysics, Antananarivo (IOGA), University of Antananarivo, P.O. Box 3843, 101, Antananarivo, Madagascar;4. Université de la Réunion, Laboratoire de l''Atmosphère et des Cyclones, UMR 8105, 15 Avenue René Cassin, CS 92003, 97744, Saint-Denis, Cedex, Réunion, France;1. Max Planck-Institute for Chemistry, Hahn-Meitner-Weg 1, 55128 Mainz, Germany;2. Institute for Atmospheric Physics, Johannes Gutenberg-University Mainz, 55099 Mainz, Germany;3. Karlsruhe Institute of Technology, P.O. Box 3640, 76021 Karlsruhe, Germany;4. National Centre for Atmospheric Science, University of East Anglia, Norwich NR4 7TJ, UK;5. Royal Netherlands Meteorological Institute (KNMI), PO Box 201, 3730 AE De Bilt, Netherlands;6. Institute for Atmospheric and Climate Science, ETH Zurich, Universitätstraße 16, 8092 Zurich, Switzerland;7. Deutsches Zentrum für Luft- und Raumfahrt (DLR), Oberfaffenhofen, Germany |
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| Abstract: | Clouds are the main tropospheric agent in the modulation of solar ultraviolet (UV) radiation in the Earth's surface. Clouds produce both attenuation and enhancement of radiation. This work shows how the local cloud cover (LCC) can partially explain mismatches between overpass satellite and ground-based instruments in the erythemal dose rate (EDR) for an urban, tropical site in Southern Hemisphere. Best agreement occurs for the scarcer cloud cover of winter. The Ozone Monitoring Instrument (OMI) EDR is on average 15% higher than ground-based measurements for cloudless skies. This value is due to both OMI algorithm misconception about aerosols and instrumental uncertainty. |
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