The atmospheric integral transparency coefficient and the Forbes effect

Ohvril, Hanno; Okulov, Oleg; Teral, Hilda; Teral, Kristina

doi:10.1016/s0038-092x(99)00031-6

Cited by 26 publications

(29 citation statements)

References 9 publications

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“…We first rewrite the formula (2) in the inverse form for calculation of coefficients of transparency p m according to a given p 2 [Ohvril et al, 1999]:…”

Section: Some Calculations Of Direct Irradiancementioning

confidence: 99%

Global dimming and brightening versus atmospheric column transparency, Europe, 1906–2007

et al. 2009

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Multiannual changes in atmospheric column transparency based on measurements of direct solar radiation allow us to assess various tendencies in climatic changes. Variability of the atmospheric integral (broadband) transparency coefficient, calculated according to the Bouguer‐Lambert law and transformed to a solar elevation of 30°, is used for two Russian locations, Pavlovsk and Moscow, one Ukrainian location, Feodosiya, and three Estonian locations, Tartu, Tõravere, and Tiirikoja, covering together a 102‐year period, 1906–2007. The comparison of time series revealed significant parallelism. Multiannual trends demonstrate decrease in transparency during the postwar period until 1983/1984. The trend ends with a steep decline of transparency after a series of four volcanic eruptions of Soufriere (1979), Saint Helens (1980), Alaid (1981), and El Chichón (1982). From 1984/1985 to 1990 the atmosphere remarkably restored its clarity, which almost reached again the level of the 1960s. Following the eruption of Mount Pinatubo (June 1991), there was the most significant reduction in column transparency of the postwar period. However, from the end of 1990s, the atmosphere in all considered locations is characterized with high values of transparency. The clearing of the atmosphere (from 1993) evidently indicates a decrease in the content of aerosol particles and, besides the decline of volcanic activity, may therefore be also traced to environmentally oriented changes in technology (pollution prevention), to general industrial and agricultural decline in the territory of the former USSR and Eastern Europe after deep political changes in 1991, and in part to migration of some industries out of Europe.

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“…We first rewrite the formula (2) in the inverse form for calculation of coefficients of transparency p m according to a given p 2 [Ohvril et al, 1999]:…”

Section: Some Calculations Of Direct Irradiancementioning

confidence: 99%

Global dimming and brightening versus atmospheric column transparency, Europe, 1906–2007

et al. 2009

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“…It is found that only 88 hourly values with almost similar properties, such as air mass (1.22-1.26), precipitable water (1.6-1.76 cm), daily ozone column amount (287.5 DU), and cloudless skies, occur in the data set. In addition, the atmospheric integral transparency coefficient concept (AITC) is used for characterization of atmospheric optical properties [34]. This coefficient (P m ) is the simplest formula ARTICLE IN PRESS used in obtaining atmospheric transparency, and is defined as…”

Section: Effect Of Aerosol Factor-turbiditymentioning

confidence: 99%

Solar global UV (280–380nm) radiation and its relationship with solar global radiation measured on the island of Cyprus

Jacovides

Assimakopoulos

Tymvios

et al. 2006

Energy

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“…The atmospheric transparency coefficient corresponding with normal values was 0.736 and 0.770 (Ohvril et al 1999), which translated into respective turbidity factors of 2.61 and 3.06. The class intervals corresponding to normal turbidity in this paper comprise T L2 values ranging from 2.6 to 3.0.…”

Section: Data Processing Methodologymentioning

confidence: 96%

“…Linke's turbidity factor was also presented in class intervals developed on the basis of the method proposed by Sivkov (1968) and Evnevich and Savikovskij (Ohvril et al 1999). The atmospheric transparency coefficient corresponding with normal values was 0.736 and 0.770 (Ohvril et al 1999), which translated into respective turbidity factors of 2.61 and 3.06.…”

Section: Data Processing Methodologymentioning

confidence: 99%

Comparison of the Linke turbidity factor in Warsaw and in Belsk

Uscka-Kowalkowska

Posyniak

Markowicz

et al. 2017

Bulletin of Geography. Physical Geography Series

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Abstract. The paper describes the relationship between direct solar radiation in a city (Warsaw) and in its broadly-defined suburban area (Belsk). The analysis covers the days of 1969-2003 when observations were carried out at both sites. The degree of extinction of solar radiation was expressed by means of Linke's turbidity factor. Its mean annual value on the selected days of the period under consideration was 3.00± 0.10 in Warsaw and 2.87±0.11 in Belsk. Average atmospheric turbidity for individual seasons of the year as well as for the whole year was higher in Warsaw than in Belsk. In all cases, except for the summer, these differences were statistically significant. The period considered was divided into two sub-periods (1969-1993 and 1994-2003), in which atmospheric turbidity in Warsaw and in Belsk was compared by individual seasons and whole years. At both analysed sites Linke's atmospheric turbidity factor decreased in 1994-2003, compared to the values for the earlier sub-period . However, the average annual atmospheric turbidity in Warsaw in comparison to Belsk remained the same, i.e. greater turbidity occurred in the city in both sub-periods.

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The atmospheric integral transparency coefficient and the Forbes effect

Cited by 26 publications

References 9 publications

Global dimming and brightening versus atmospheric column transparency, Europe, 1906–2007

Global dimming and brightening versus atmospheric column transparency, Europe, 1906–2007

Solar global UV (280–380nm) radiation and its relationship with solar global radiation measured on the island of Cyprus

Comparison of the Linke turbidity factor in Warsaw and in Belsk

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