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The transportation time, within 1-2 days (or less), pointed towards the presence of relatively fresh smoke particles over the site. Some strong layers aloft were observed with particle backscatter and extinction coefficients (at 355\u2009nm) greater than 5\u2009Mm<jats:sup>\u22121<\/jats:sup>\u2009sr<jats:sup>\u22121<\/jats:sup>and close to 300\u2009Mm<jats:sup>\u22121<\/jats:sup>, respectively. The particle intensive optical properties showed features different from the ones reported for aged smoke, but rather consistent with fresh smoke. The \u00c5ngstr\u00f6m exponents were generally high, mainly above 1.4, indicating a dominating accumulation mode. Weak depolarization values, as shown by the small depolarization ratio of 5% or lower, were measured. Furthermore, the lidar ratio presented no clear wavelength dependency. The inversion of the lidar signals provided a set of microphysical properties including particle effective radius below 0.2\u2009<jats:italic>\u03bc<\/jats:italic>m, which is less than values previously observed for aged smoke particles. Real and imaginary parts of refractive index of about 1.5-1.6 and 0.02<jats:italic>i<\/jats:italic>, respectively, were derived. The single scattering albedo was in the range between 0.85 and 0.93; these last two quantities indicate the nonnegligible absorbing characteristics of the observed particles.<\/jats:p>","DOI":"10.1155\/2014\/421838","type":"journal-article","created":{"date-parts":[[2014,7,10]],"date-time":"2014-07-10T17:11:15Z","timestamp":1405012275000},"page":"1-11","source":"Crossref","is-referenced-by-count":18,"title":["Forest Fire Smoke Layers Observed in the Free Troposphere over Portugal with a Multiwavelength Raman Lidar: Optical and Microphysical Properties"],"prefix":"10.1155","volume":"2014","author":[{"given":"S\u00e9rgio","family":"Nepomuceno Pereira","sequence":"first","affiliation":[{"name":"\u00c9vora Geophysics Center, Rua Rom\u00e3o Ramalho 59, 7000 \u00c9vora, Portugal"},{"name":"Andalusian Institute for Earth System Research IISTA-CEAMA, University of Granada, Autonomous Government of Andalusia, Avenida del Mediterr\u00e1neo s\/n, 18006 Granada, 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