The influence of absolute thermal inversion on the relative humidity in the lower troposphere

Abstract

ABSTRACT:Increasing temperature values in altitude, as a deviation from normal law, generates stability of air masses. The most typical situations occur outside the Carpathian chain. In particular cases, when the maximum barometric prevail on large European territories, absolute thermal inversions occur, which are characterized by large thickness, intensity, duration and amplitude. These types of thermal inversions block water vapour at lower levels and produce changes in atmospheric moisture regime by forming mists and low stratiform clouds. Geostatistical analysis of this climatic risk phenomena for aeronautical activity was carried out by processing temperature and moisture database from 7 aerological stations and analysis of synoptic maps. The results revealed a strong connection between the two meteorological phenomena, with the highest frequency in winter.

Variation of Aerosol Optical Properties over Cluj-Napoca, Romania, Based on 10 Years of AERONET Data and MODIS MAIAC AOD Product

“…The main sources of local emissions are represented by heavy traffic and heating facilities during winter, with few emissions related to industrial facilities [40,41]. The positioning of the city in a valley with neighboring high topography may cause frequent temperature inversions during the winter season [42], and contributes to the accumulation of air pollution in the city [41]. In addition, long-range transported aerosols such as Saharan dust [39] and biomass burning [43] may also influence the area.…”