10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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Intensive Campaign Measurements in South of Romania
CRISTINA MARIN, Luminita Marmureanu, Simona Andrei, Livio Belegante, Alexandru Dandocsi, National Institute of R&D for Optoelecttronics, UPB
Abstract Number: 1197 Working Group: Remote/Regional Atmospheric Aerosol
Abstract The uncertainty in deriving the radiative forcing of the aerosols is originating in insufficient understanding of secondary organic aerosol formation and the aerosol-cloud interaction (IPCC, 2013). The complex atmospheric interactions, the night time and day time chemistry that intervene in aerosol formation represent a challenging task even in nowadays.
The intensive campaigns represent a proper method to extensively characterize the atmospheric physical and chemical processes. The results obtained in AROMAT (Airborne Romanian Measurements of Aerosols and Trace gases) campaign held in Bucharest, in 2016, are presented in this study. AROMAT was supported by ESA in the framework of its Copernicus Earth Observation programme and was a preparatory Cal/Val Campaign. The main objectives were to test newly developed instruments for airborne measurements and to prepare the validation programme of the future atmospheric satellites. The measurements took place in two sites in Romania, visible from the Ozone Monitoring Instrument satellite as important NO2 hotspots (Tg. Jiu Valley where is located the Turceni power plant and Bucharest- the capital of Romania).
In this study are presented the results obtained in the last part of the second AROMAT Campaign, the aerosols and gases evolutions being described for the entire one-week intensive campaign, highlighting the main sources present in the South part of Romania.
In order to study the aerosols and gases variability, the measurement strategy involved simultaneous and collocated active, passive remote sensing and in-situ measurements. A comprehensive "picture" of atmospheric structure and composition on vertical and horizontal was obtained through characterization of the planetary boundary height, the aerosol layers derived from Lidar measurements, submicronic nonrefractory aerosol chemical composition (derived from Aerosol Chemical Speciation Monitor), black carbon concentration (from the Aethalometer) and the gases concentration.
For the entire measuring period, the total average mass concentration of submicronic particles is 6.6 µg/m3, from which organic and sulfate have the highest proportion, 46% and 32%, respectively. The black carbon (BC) originated from fossil fuel represented the mainly part, 86% from the total amount of black carbon. BC resulted from fossil fuel and NOx concentration have similar trend, both indicating the traffic emission as the primary source. The low concentrations of BC resulted from biomass burning are in good agreement with the ACSM marker for levoglucosan, f60. The values for f60 are lower than the threshold value for biomass burning aerosols.
During this time, important sources of local anthropogenic and natural long-range transport are identified. Throughout the campaign an important dust intrusion, confirmed by DREAM model, was detected by also passive and active instruments evidencing the presence of non-spherical particles in the upper layers of the atmosphere and an increased Angstrom exponent.