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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:12 |
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Conference: Bucharest University Faculty of Physics 2012 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Saharan dust intrusions over Romania
Authors:
S. DASCALU (1), Anca NEMUC (2), Madalina GOTHARD (1)
Affiliation:
(1) University of Bucharest, Faculty of Physics, P.O. BOX MG-11, Magurrele, Romania
(2) National Institute of R&D for Optoelectronics Bucuresti-Magurele
E-mail
sorin.dascalu89@yahoo.com, anca@inoe.inoe.ro, liter_am@yahoo.com
Keywords:
dust, AOD, sun photometer
Abstract:
The troposphere, the lowest major atmospheric layer, extending from the Earth`s surface up to the bottom of the stratosphere, is the place where almost all weather phenomena occur. Among other components the tropospheric air contains aerosols, suspensions of small liquid and solid particles, which is transported over large distances by air masses. Under the influence of global atmospheric circulation and none the less, under the variations that appear in the pressure field, air masses with different origins arrive above our country. The present study aims to analyze the Saharan dust intrusions on the Romanian territory on a five year track (2007/2011) using DREAM as a forecast model http://www.bsc.es/projects/earthscience/DREAM.
It can be seen on the whole timeline that, according to the day by day distribution, the dust intrusions were irregular, more exactly they were more frequent between 2007- 2008, less frequent between 2009-2010 and less in 2011. For the validation of these intrusions we also used LIDAR data observations. Data measurements registered with a solar photometer placed at INOE station near Bucharest have been also analyzed. During the dust intrusions sunphotometer data showed AOD values mainly above the monthly average for 2007, 2009 and 2010, with an exceptional situation for august 2009 when all AOD values were above average. The AOD peak for the 5-years period was on April 27th, 2008 (1.354 at 500nm). The Angstrom coefficient reached a minimum (0.085) on the 12th of April 2008, and as a special case we can mention December 2009 when the Angstrom exponent was exclusively under 1. The particles dimensional distribution plots for the studied period show typical Saharan dust aerosols values, confirming the prognosis of the Saharan dust intrusions over Romanian territory.
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