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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:28 |
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Conference: Bucharest University Faculty of Physics 2012 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
An intensive case of Saharan dust intrusion over Romania
Authors:
Madalina GOTHARD (1), Anca NEMUC (2), S. DASCALU (1)
Affiliation:
(1) University of Bucharest, Faculty of Physics, Bucharest, Romania
(2) National Institute of R&D for Optoelectronics Bucuresti-Magurele
E-mail
liter_am@yahoo.com, anca@inoe.inoe.ro, sorin.dascalu89@yahoo.com
Keywords:
aerosols, AOD, sun photometer
Abstract:
The presence of aerosols in the atmosphere has a significant importance as it controls the Earth-Atmosphere radiative budget. Thus, aerosols contribute in reducing global warming by scattering and absorption of short and long wavelengths radiation. Besides this there are also concerns about the effects of aerosols on human health. The PM10 (particles on the order of 10 micrometers or less) in concentrations equal or above 50 μg/m3 are dangerous for the respiratory system [IPCC, 2001].The aim of the present study is to analyze a case of high level PM10 over Romania. BSC – DREAM8b PM10 [http://www.bsc.es/caliope] simulation model was used to emphasize PM10 concentrations above 50 μg/m3 in the Romanian atmosphere. A special case was identified between 11.06.2010 – 19.06.2010. LIDAR measurements have been carried out for the studied period to find possible aerosol intrusions at different atmospheric levels. In order to highlight the origin of these particles we have used HYSPLIT-backtrajectory model [Draxler si al. 2003] and DREAM-DUST prognosis model[http://www.bsc.es/projects/earthscience/DREAM]. Also, data measurements taken with a solar photometer near Bucharest and Eforie Nord were used. DREAM-DUST model highlighted intensive Saharan dust intrusions over Romania during the studied period. At the same time HYSPLIT backward trajectory model confirmed the air mass circulation out of Sahara towards Romania. The weather conditions were favorable, the absence of precipitations preventing the wet deposition of the dust.Sunphotometer data show AOD values ( at 500nm) above the monthly average (0.317/0.250) for the periods between the 12th and 16th of June, respectively 18th and 20th of June for INOE station, with a peak value (0.955 ) reached on the 20th of June. For the Eforie station AOD values above average were between 14th and 16th of June and 20th of June, with a peak on June 16 (0.480). The Angstrom coefficient recorded a minimum on June 19th 2010 with a value of 0.407 for the INOE station and 0.699 for Eforie. The particle size distribution for the studied period shows typical Saharan dust aerosols values [Dubovnik et al,2002]. The origin of the PM10 particles in the atmosphere above Romania during 11.06.2010 – 19.06.2010 has been proved to be Saharan region.
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