DATE2022-06-23 00:18:46
TITLEAssociations between atmospheric fronts and day-to-day temperature changes: A preliminary study
AUTHORSDenisa Navrátilová (1,2) ,Radan Huth (1,2) ,Marek Kašpar (2)
  1. 1) Faculty Of Science, Charles University, Prague (Czechia) ,2) Institute Of Atmospheric Physics, The Czech Academy Of Sciences, Prague (Czechia)
ABSTRACTRecently, a number of studies have appeared that related atmospheric fronts with precipitation. For that purpose, the position of fronts has been identified by objective (computer-assisted) algorithms. The geographical extent of these analyses ranged from global to regional, including the Mediterranean region. Although fronts are usually defined by temperature contrast of two adjacent air masses, the behaviour of temperature near Earth’s surface during the passage of a front is far from trivial The reason is that fronts are defined by the temperature gradient aloft, not at surface, and that a number of small-scale (regional and local) processes play a role in modifying surface temperature. Therefore, an analysis of how fronts relate to surface temperature and its temporal changes (or, alternatively, spatial gradient) is needed. This is particularly so because fronts are a likely contributor to the asymmetry of statistical distributions of day-to-day temperature changes, which are an important indicator of weather variability. This contribution is a preliminary study attempting to identify the mutual relationships of atmospheric fronts with surface temperature day-to-day changes. The objective algorithm utilizing the thermal frontal parameter (second derivative of 850 hPa temperature across the frontal line) is used to define the frontal position. Reanalysis and other gridded datasets are used as data sources. The focus of the study is on the Mediterranean region.