ELFT HÍRADÓ

[mcsete AT physx.u-szeged.hu]

Szeminárium meghívó

Q1 & D1 cikkek bemutatója

Idöpont: 2023. október 25. (szerda), 15.00 óra
Helyszín: Budó Ágoston tanterem & online
https://join.skype.com/DymX2INESv5T

1.
Elöadó: Dr. habil. Horváth László
D.Sc., honour prof., University of Szeged
Department of Optics and Quantum Electronics
ELKH-SZTE Photoacoustic Research Group

"A single-point modeling approach for the intercomparison and  
evaluation of ozone dry deposition across chemical transport models  
(Activity 2 of AQMEII4)"
O. E. Clifton et al.: Atmospheric Chemistry and Physics, 23 (2023) 9911-9961.

"A primary sink of air pollutants and their precursors is dry  
deposition. Dry deposition estimates differ among chemical transport  
models, yet an understanding of the model scattering is incomplete.  
The study examines 18 dry deposition model schemes from regional and  
global chemical transport models as well as standalone models used for  
impact assessments or process understanding. The schemes are  
configured as single-point models at eight Northern Hemisphere  
locations with observed ozone fluxes. Single-point models are driven  
by a common set of site-specific meteorological and environmental  
conditions. The interquartile range across models in multiyear mean  
ozone deposition velocities ranges from a factor of 1.2 to 1.9  
annually across sites and tends to be highest during winter compared  
with summer. It has been demonstrated, how contributions from  
depositional pathways (stomatal uptake, cuticular and soil surface  
deposition, etc.) vary across models. Models can disagree with respect  
to relative contributions from the pathways, even when they predict  
similar deposition velocities, or agree with respect to the relative  
contributions but predict different deposition velocities. Both  
stomatal and nonstomatal uptake contribute to the large model spread  
across sites. Results may bring scientists, who model air quality and  
dry deposition together, with scientists, who measure ozone fluxes to  
evaluate and improve dry deposition schemes in the chemical transport  
models used for research, planning, and regulatory purposes.?

&
Az MTA állásfoglalásának ismertetése a predator folyóiratokról. (Magyarul)

2.
Elöadó: Fekete János
University of Szeged
Department of Optics and Quantum Electronics
ELKH-SZTE Photoacoustic Research Group

"Open photoacoustic cell for concentration measurements in rapidly  
flowing gas"
J. Fekete et al.: Photoacoustics 20 (2023) 100469.

"High temporal resolution concentration measurements in rapid gas  
flows pose a serious challenge for most analytical instruments. The  
interaction of such flows with solid surfaces can generate excessive  
aero-acoustic noise making the application of the photoacoustic  
detection method seemingly impossible. Yet, the fully open  
photoacoustic cell (OC) has proven to be operable even when the  
measured gas flows through it at a velocity of several m/s. The OC is  
a slightly modified version of a previously introduced OC based on the  
excitation of a combined acoustic mode of a cylindrical resonator. The  
noise characteristics and analytical performance of the OC are tested  
in an anechoic room and under field conditions. Here we present the  
first successful application of a sampling-free OC for water vapor  
flux measurements."

Minden érdeklödöt szeretettel várunk.

Dr. Csete Mária
Szeminárium koordinátor





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