The Role of Atmospheric Circulation in Favouring Forest Fires in the Extreme Southern Portugal

Sustainability, Journal Year: 2024, Volume and Issue: 16(16), P. 6985 - 6985

Published: Aug. 15, 2024

The study explores two forest fires in extreme southern Portugal aiming to increase the knowledge of how atmospheric circulation influenced fire dynamics each event. meteorological conditions were simulated by Meso-NH full-physics non-hydrostatic limited-area research model. numerical simulations performed using a two-way nested domain configuration with horizontal resolutions 2500 m and 500 m. In both cases, large-scale environment was marked Azores Anticyclone west which induced northerly winds over coastal Mainland Portugal. analysis Tavira’s (18–21 July 2012, 24,800 ha total burned area) revealed flow characteristics resembling low-level jet located below 1 km, stronger during second day resulting enhanced spread rates. case (Aljezur, 19–21 June 2020; 2302 highlights occurring under atypical weather conditions, namely lower air temperature higher relative humidity; however, orographic effects produced downslope favouring propagation. This provides better understanding critical South investigates atmosphere–orography interactions region that played an important role development these fires. Increasing about large Southern can support management practices encourage sustainable region.

Language: Английский

Comparison of the Contrail Drift Parameters Calculated Based on the Radiosonde Observation and ERA5 Reanalysis Data

Atmosphere, Journal Year: 2024, Volume and Issue: 15(12), P. 1487 - 1487

Published: Dec. 12, 2024

Aircraft contrails exhibit optical properties similar to those of natural high-level clouds (HLCs) and also form persistent cirrus cloudiness. This paper outlines a methodology for detecting identifying based on the joint analysis aircraft trajectories (ADS-B monitoring), vertical profiles meteorological parameters (radiosonde observation (RAOB) ERA5 reanalysis), polarization laser sensing data obtained with matrix lidar. The potential application reanalysis determining contrail drift (azimuth, speed, distance, duration, time appearance above lidar) interpreting atmospheric in terms presence crystalline ice particles assessment degree their horizontal orientation is demonstrated. In examined case (6 February 2023; Boeing 777-F contrail; flight altitude 10.3 km; HLC range registered lidar 9.5–10.3 km), difference times over lidar, calculated from RAOB data, did not exceed 10 min. wind direction was 12°, speed 2 m/s, distance approximately same at about 30 km. demonstrated technique will allow experimental dataset microphysical characteristics be enhanced empirical relationships between these quantities established.

Language: Английский