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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:20 |
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Conference: Bucharest University Faculty of Physics 2018 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Aerosol direct radiative forcing and its efficiency in Bucharest area: seasonal characteristics
Authors:
Gabriela MANOLACHE(1), Sabina STEFAN(2), Gabriela IORGA(3)
*
Affiliation:
1) Technical University of Civil Engineering of Bucharest, Bd. Lacul Tei nr. 122 – 124, 020396, Bucharest, Romania
2) University of Bucharest, Faculty of Physics, P.O.Box MG-11, Magurele, 077125 Bucharest, Romania
3) University of Bucharest, Department of Physical Chemistry (Physics Group), Bd. Regina Elisabeta 4-12, 030018, Bucharest, Romania
E-mail
gabriela.iorga@g.unibuc.ro
Keywords:
aerosol, direct radiative forcing, forcing efficiency, regional scale
Abstract:
The study focus is upon identified aerosol variability in Bucharest area and its relationships with aerosol direct effect/forcing (DRE/DRF). The aerosol (particulate matter less than 10 µm, PM10) samples were collected by low-volume samplers at three sampling sites covering three types of pollution (urban, suburban, and rural) in Bucharest region during a yearlong campaign, from 1st of June 2014 to 31st of May 2015. The aerosol optical properties necessary as input for direct forcing calculations were computed using the Optical Properties of Aerosol and Clouds (OPAC) software package based on Mie scattering theory. We observed direct radiative forcing variations within the regional scale of about 50 km x 50 km with three seasonal forcing structures under same meteorological conditions, mainly determined by the PM10 variability and the variations of local geophysical variables. The presence of various fractions of clouds also changed the distribution of DRE. The aerosol forcing efficiency (RFE) in the area was found to decrease by 3-4 times for the highest polluted site, by 1.5-2 times for the medium polluted site and only by 1.1-1.3 times for the rural site, when the relative humidity increases from 0 to 90%. A comparison of aerosol forcing in Bucharest area and worldwide shows our estimations fit well within the range of DRF and RFE observed in Europe and compare well with the existing previous studies worldwide. Overall, results indicate a high pollution potential of Bucharest area with non-negligible implications for the DRE, even if the city is located in open plain.
Acknowledgement:
Research accepted for publication in Romanian Journal of Physics.
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