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001-es BibID:	BIBFORM121494
035-os BibID:	(Scopus)85194544423 (WoS)001234277500001
Első szerző:	Gandhi, Arun
Cím:	An Observational Case Study of a Radiation Fog Event / Arun Gandhi, István Geresdi, András Zénó Gyöngyösi, Ágoston Vilmos Tordai, Péter Torma, András Rehak, Mariann Bíró-Szilágyi, Gyula Horvath, Zita Ferenczi, Kornélia Imre, István Lázár, András Peterka, Tamás Weidinger
Dátum:	2024
ISSN:	0033-4553
Megjegyzések:	A micrometeorological fog experiment was carried out in Budapest, Hungary during the winter half year of 2020-2021. The field observation involved (i) standard meteorological and radiosonde measurements; (ii) surface radiation balance and energy budget components, and (iii) ceilometer measurements. 23 fog events occurred during the whole campaign. Foggy events were categorized based on two different methods suggested by Tardif and Rasmussen (2007) and Lin et al. (2022). Using the Present Weather Detector and Visibility sensor (PWD12), duration of foggy periods are approximately shorter (* 9%) compared to ceilometer measurements. The categorization of fog based on two different methods suggests that duration of radiation fogs is lower compared to that of cloud base lowering (CBL) fogs. The results of analysis of observed data about the longest fog event suggest that (i) it was a radiation fog that developed from the surface upwards with condition of a near neutral temperature profile. Near the surface the turbulent kinetic energy and turbulent momentum fluxes remained smaller than 0.4 m2 s -2 and 0.06 kg m-1 s -2, respectively. In the surface layer the vertical profile of the sensible heat flux was near constant (it changes with height * 10%), and during the evolution of the fog, its maximum value was smaller than 25 W m-2, (ii) the dissipation of the fog occurred due to increase of turbulence, (iii) longwave energy budget was close to zero during fog, and a significant increase of virtual potential temperature with height was observed before fog onset. The complete dataset gives an opportunity to quantify local effects, such as tracking the effect of strengthening of wind for modification of stability, surface layer profiles and visibility. Fog formation, development and dissipation are quantified based on the micrometeorological observations performed in suburb area of Budapest, providing a processing algorithm for investigating various fog events for synoptic analysis and for optimization of numerical model parameterizations.
Tárgyszavak:	Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Energy budget components Fog Micrometeorology Turbulent fluxes Visibility
Megjelenés:	Pure And Applied Geophysics. - (2024). , p. 1-25. -
További szerzők:	Geresdi István Gyöngyösi András Zénó Tordai Ágoston Vilmos Torma Péter Rehak András Bíró-Szilágyi Mariann Horváth Gyula Ferenczi Zita Imre Kornélia Lázár István (1986-) (geográfus) Peterka András Weidinger Tamás (1948-)
Pályázati támogatás:	GINOP-2.3.3-15-2016-00007 GINOP GINOP-2.1.3-15-2016-00055 GINOP 138176 OTKA CA20108-FAIR Egyéb
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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