부산대학교 도서관

We focus on an island wake episode that occurred in the Madeira Archipelago region of the north-east Atlantic at 32.5°N, 17°W. The Weather Research and Forecasting numerical model was used in a (one-way) downscaling mode, considering initial and boundary conditions from the European Centre for Medium-range Weather Forecasts system. The current literature emphasizes adiabatic effects on the dynamical aspects of atmospheric wakes. Changes in mountain height and consequently its relation to the atmospheric inversion layer should explain the shift in wake regimes, from a 'strong-wake' to 'weak-wake' scenario. Nevertheless, changes in sea-surface temperature variability in the lee of an island can induce similar regime shifts because of exposure to stronger solar radiation. Increase in evaporation contributes to the enhancement of convection and thus to the uplift of the stratified atmospheric layer above the critical height, with subsequent internal gravity wave activity. Keywords Air-sea interaction * Convective boundary layer * Inertial gravity waves * Marine atmospheric boundary layer * Resonance waves
1 Introduction Madeira Island is in the north-east Atlantic (32.5°N; 17°W). Its mountain range of volcanic origin dominates the interior orography. The mountains are oriented perpendicular to predominant north-east trade [...]