The Po Valley Fog Experiment 1989.

Fuzzi, S.; Facchini, M. C.; Orsi, G.; Lind, John A.; Wobrock, W.; Kessel, M.; Maser, R.; Jaeschke, W.; Enderle, K. H.; Arends, B. G.; Berner, A.; Solly, I.; Kruisz, C.; Reischl, G.; Pahl, S.; Kaminski, U.; Winkler, P.; Ogren, J. A.; Noone, Kevin J.; Hallberg, A.; Fierlinger-Oberlinninger, H.; Puxbaum, Hans; Marzorati, A.; Hansson, H.‐C.; Wiedensohler, Alfred; Svenningsson, I. B.; Martinsson, Bengt G.; Schell, D.; Georgii, H.‐W.

doi:10.1034/j.1600-0889.1992.t01-4-00002.x

Cited by 86 publications

(40 citation statements)

References 39 publications

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“…Our focus is in the development of the size distributions and droplet chemical compositions as a function of time, and in the reduction of visibility. Although the ammonia mixing ratios used in this study are comparable to those found for example in the Po Valley area (Fuzzi et al, 1992), and high nitrate concentrations have been found in fogwater in California (Jacob et al, 1985), we are not trying to specifically model any observed pollution fogs, but rather to take a step forward from the simple Köhler theory calculations, in order to qualitatively find out which kind of effects soluble trace gases may have on fog formation at heavily polluted conditions. Our future goal is to model observed pollution fogs; however, that will require more sophisticated models than those used in the present study.…”

Section: Introductionmentioning

confidence: 89%

On the formation of radiation fogs under heavily polluted conditions

2003

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Abstract.We have studied the effect of gaseous pollutants on fog droplet growth in heavily polluted air using a model that describes time-dependent sulfate production in the liquid phase and thermodynamical equilibrium between the droplets and the gas phase. Our research indicates that the oxidation of SO 2 to sulfate has a significant effect on fog droplet growth especially when hygroscopic trace gases, for example HNO 3 and NH 3 are present. The increased sulfate production by dissolution of hygroscopic gases results from increased pH (caused by absorption of ammonia) and from the increased size of the fog/smog droplets. Our results indicate that unactivated fogs may become optically very thick when the droplet concentrations are on the order of several thousand per cubic centimeter of air.

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Section: Introductionmentioning

confidence: 89%

On the formation of radiation fogs under heavily polluted conditions

2003

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“…In order to better understand this structure, measurements during various field experiments have been obtained over the last 200 years (i.e. Wells, 1814;Willett, 1928;Fuzzi et al, 1998;Tardif and Rasmussen, 2007). PARISFOG and TOULOUSEFOG are the most recent field experiments.…”

Section: Introductionmentioning

confidence: 99%

Fog characteristics at the airport of Thessaloniki, Greece

Stolaki¹,

Kazadzis

Foris

et al. 2009

Nat. Hazards Earth Syst. Sci.

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Abstract.A statistical approach in order to study fog event characteristics occuring at the airport of Thessaloniki, Northern Greece is presented in this work. To achieve this, the seasonal and diurnal characteristics of fog are investigated using 35 years of observations of meteorological parameters such as: visibility, air temperature, dew point temperature, air relative humidity, wind vector, precipitation, and cloud base height and coverage. Hourly surface observations of fifteen (15) years (1991)(1992)(1993)(1994)(1995)(1996)(1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005) are used to identify fog events induced by various physical mechanisms. Fog events are classified into fog types through the application of objective criteria that are derived upon fog formation processes and under the influence of various physiographic features. The temporal variability of different fog type occurrences are examined and the events are characterized according to their duration and intensity.

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“…[3] In this letter, aerosol properties derived from optical measurements are described for the Po Valley, a heavily populated region in northern Italy, with high agricultural and industrial activity, and elevated levels of aerosols, haze and fog [Fuzzi et al, 1998]. The measurements are based on 7-year time series provided by two sun-photometers located at the two ends of the valley.…”

Section: Introductionmentioning

confidence: 99%

Aerosol variability in the Po Valley analyzed from automated optical measurements

Mélin

2005

Geophysical Research Letters

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Aerosol characteristics for the Po Valley (northern Italy) are analyzed using 7‐year time series of automated optical measurements recorded at two sites located at the extreme ends of the valley, one in the northwest area and the other in the northern Adriatic coastal region (Acqua Alta Oceanographic Tower). The annual cycles of aerosol optical thickness τa at 440 nm are very similar, with an overall daily average of 0.35–0.39, minima in winter and maxima in spring or summer. The Ångström exponent is remarkably constant in time and across sites, averaging 1.55 ± 0.35. Conversely, the diurnal variability is very different. The site of Ispra shows an increase in aerosol load during the day (amplitude of ∼10%), typical of an environment near urban/industrial sources, whereas the coastal Adriatic site exhibits a strong decrease from morning to afternoon (amplitude of ∼20%). Both trends are mirrored by the variability in precipitable water vapor.

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The Po Valley Fog Experiment 1989.

Cited by 86 publications

References 39 publications

On the formation of radiation fogs under heavily polluted conditions

On the formation of radiation fogs under heavily polluted conditions

Fog characteristics at the airport of Thessaloniki, Greece

Aerosol variability in the Po Valley analyzed from automated optical measurements

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