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- W3197331276 abstract "Abstract The frequency, strength and seasonal variations of surface-based temperature inversions (SBTIs) in Upper Silesia (Southern Poland) were examined using data from January 2001 to September 2020. Based on the air temperatures recorded at the meteorological station of the Institute of Earth Sciences in Sosnowiec (263 m a.s.l.) at heights of 2 m and 88 m above the ground, the vertical temperature gradient of the 100-m layer ( γ Sos 100 m) was determined. A lapse rate of γ Sos 100 m > 0.5 K was defined as a temperature inversion. The measurements for 00 UTC (midnight) and 12 UTC (midday) were compared with data from the upper air station in Wrocław (116 m a.s.l.) located in the Lower Silesia Lowland, approximately 170 km NW of Sosnowiec. Based on soundings from Wrocław, in addition to the temperature gradient in the lower 100-m layer of air ( γ Wrc 100), three other characteristics of SBTIs were calculated: inversion depth (ID) or thickness in metres, inversion strength (Δ T i ) in K and vertical temperature gradients across the whole SBTI layer γ i in K 100 m −1 . On an annual basis, the frequency of nighttime SBTIs ( γ > 0.5 K 100 m −1 ) ranged from 47% in Sosnowiec to almost 59% in Wrocław. At both stations, the fewest SBTIs occurred in winter (23–38%) and the most in summer (64–75%). Moreover, they were more frequent in spring (52–61%) than in autumn (49–59%). The SBTI frequency was very low during the midday hours, amounting to 0.6–0.7% days a year, and it increased to 1–2% only in winter. Annually, the depth of 81% of inversions ranged between 50 and 300 m, varying seasonally from almost 67% in winter to 87% in summer. The presented research shows that SBTIs in winter were among the main factors contributing to a high concentration of particulate matter pollutants in the ground-level atmosphere. During nights with temperature inversions, the annual mean PM 10 concentration reached 125% of the mean value, ranging from 114% in summer to 189% in winter." @default.
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- W3197331276 date "2021-09-09" @default.
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- W3197331276 title "Surface-based nocturnal air temperature inversions in southern Poland and their influence on PM10 and PM2.5 concentrations in Upper Silesia" @default.
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- W3197331276 doi "https://doi.org/10.1007/s00704-021-03752-4" @default.
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