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Communication Dans Un Congrès Année : 2023

Overview of the ALPACA-PBL Winter Field Experiment

Natalie Brett
  • Fonction : Auteur
  • PersonId : 1155290
Kathy S. Law
Brice Barret
Sarah Albertin
  • Fonction : Auteur
  • PersonId : 1121417
Slimane Bekki
Julia Maillard
  • Fonction : Auteur
  • PersonId : 1064012
  • IdRef : 269032983
Jean-Christophe Raut
François Ravetta
David Atkinson
  • Fonction : Auteur
  • PersonId : 906544
Julia Schmale
Steve Arnold
  • Fonction : Auteur
William R. Simpson
  • Fonction : Auteur
  • PersonId : 1036636

Résumé

The PBL of cold and dark atmosphere verify extreme conditions in the surface energy balance, thermodynamic structure and wind regime. These conditions lead to poor mixing and dispersion within stratified environments, local re-circulations, sub-mesoscale flows, occurrence of weak and sporadic turbulence and development of extremely stable and multilayered PBLs. We report observations of radiation, turbulence, dynamics and composition of the planetary boundary layer (PBL) during the IGAC-ALPACA international field experiment in Fairbanks, Alaska. The study region is the Tanana Valley in the Interior of Alaska. The area exhibits an extremely cold meteorology where persistent anticyclones drive blocking and stagnant atmospheric flow conditions that limit ventilation and exacerbate air pollution. This extreme meteorology is interrupted by the northward migration of cyclonic air masses largely influencing by direct radiative forcing the surface energy balance and therefore the PBL state and structure. The field-intensive experiment was conducted in the winter of 2022. The first period was from mid-January to the end of February and was dedicated to PBL dynamics and composition in the context of air pollution and meteorology interactions. The second phase covered the months of March and April and was dedicated to improving understanding of spatial variations of PBL regimes and the influences of sub-mesoscale flows in the winter PBL. In this presentation an overview of the experiment and first results highlighting the project hypothesis and scientific results will be provided.
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Dates et versions

insu-04216320 , version 1 (24-09-2023)

Identifiants

  • HAL Id : insu-04216320 , version 1

Citer

Gilberto Javier Fochesatto, Natalie Brett, Kathy S. Law, Roman Pohorsky, Andrea Baccarini, et al.. Overview of the ALPACA-PBL Winter Field Experiment. The 103rd AMS Annual Meeting, Jan 2023, Denver, United States. ⟨insu-04216320⟩
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