Evolution of stratospheric aerosols in the post-Pinatubo period measured by solar occultation |
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| Institution: | 1. Applied Physics Department, University of Granada, Granada, Spain;2. Andalusian Institute for Earth System Research (IISTA), Granada, Spain;3. NASA Goddard Space Flight Center, Greenbelt, MD, USA.;4. Science Systems and Applications, Inc., Lanham, MD, USA.;5. Department of Atmospheric and Oceanic Science, University of Maryland, College Park, MD, USA;6. ADNET Systems Inc, Bethesda, MD, USA.;7. Atmospheric Optics Group, University of Valladolid, Valladolid, Spain;8. Institute of Environmental Physics, University of Bremen, Bremen, Germany;9. Harvard Smithsonian Center for Astrophysics, Cambridge, MA, USA;1. Department of Physics, University of Shkodra, Shkoder, Albania;2. EPhysLab, Facultade de Ciencias, Universidade de Vigo, Ourense, Spain;3. Departamento de Fisica, Centro de Ciencias Exactas e Ingenierias, Universitad de Guadalajara, Mexico;4. Remote Sensing Laboratory/CommSensLab, Universitat Politècnica de Catalunya, Barcelona 08034, Spain;5. Ciències i Tecnologies de l''Espai - Centre de Recerca de l''Aeronàutica i de l''Espai, Institut d''Estudis Espacials de Catalunya (CTE-CRAE/IEEC), Universitat Politècnica de Catalunya, Barcelona 08034, Spain;6. Astronomical Observatory of the “Taras Shevchenko” National University, Kyiv, Ukraine |
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| Abstract: | This paper presents particle size distributions of stratospheric aerosols derived from solar occultation data measured by the instrument ORA (an acronym for Occultation RAdiometer) during the period August 1992–May 1993. Starting from the UV-visible wavelength dependence of extinction coefficient profiles, an algorithm is developed that allows to retrieve the three parameters of an equivalent log-normal distribution and that makes use of vertical regularization. Comparison of retrieved mode radius and particle number density with existing data is found to be satisfactory. The evolution of the stratospheric aerosols is clearly influenced by sedimentation and coagulation as expected but also by vertical circulation. In a simple 1-D model, we derive the vertical wind profile and we interpret the temporal evolution of the particle mode radius. |
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