Overview of the ALPACA-PBL Winter Field Experiment
Gilberto Javier Fochesatto
(1)
,
Natalie Brett
(2)
,
Kathy S. Law
(2)
,
Roman Pohorsky
(3)
,
Andrea Baccarini
(3)
,
Brice Barret
(4)
,
Gianluca Pappaccogli
(5)
,
Federico Scoto
(5)
,
Maurizio Busetto
(6)
,
Elsa Dieudonné
(7)
,
Sarah Albertin
(8)
,
Slimane Bekki
(2)
,
Julia Maillard
(2)
,
Meeta Cesler‐maloney
(1)
,
Jean-Christophe Raut
(2)
,
François Ravetta
(2)
,
David Atkinson
(9)
,
Douglas Keller
(10)
,
Tjarda J Roberts
(11)
,
Julia Schmale
(3)
,
Stefano Decesari
(6)
,
Antonio Donateo
(5)
,
Konstantinos Doulgeris
(12)
,
David Brus
(12)
,
Steve Arnold
(13)
,
Jingqui Mao
(1)
,
William R. Simpson
(1)
1
UAF -
University of Alaska [Fairbanks]
2 TROPO - LATMOS
3 EERL - Extreme Environments Research Laboratory
4 LAERO - Laboratoire d'aérologie
5 ISAC - Istituto di Scienze dell'Atmosfera e del Clima [Lecce]
6 ISAC - Istituto di Scienze dell'Atmosfera e del Clima [Bologna]
7 LPCA - Laboratoire de Physico-Chimie de l'Atmosphère
8 IGE - Institut des Géosciences de l’Environnement
9 UVIC - University of Victoria [Canada]
10 LMD - Laboratoire de Météorologie Dynamique (UMR 8539)
11 LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace
12 FMI - Finnish Meteorological Institute
13 University of Leeds
2 TROPO - LATMOS
3 EERL - Extreme Environments Research Laboratory
4 LAERO - Laboratoire d'aérologie
5 ISAC - Istituto di Scienze dell'Atmosfera e del Clima [Lecce]
6 ISAC - Istituto di Scienze dell'Atmosfera e del Clima [Bologna]
7 LPCA - Laboratoire de Physico-Chimie de l'Atmosphère
8 IGE - Institut des Géosciences de l’Environnement
9 UVIC - University of Victoria [Canada]
10 LMD - Laboratoire de Météorologie Dynamique (UMR 8539)
11 LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace
12 FMI - Finnish Meteorological Institute
13 University of Leeds
Kathy S. Law
- Fonction : Auteur
- PersonId : 740774
- IdHAL : kslaw
- ORCID : 0000-0003-4479-903X
- IdRef : 130855154
Andrea Baccarini
- Fonction : Auteur
- PersonId : 1189333
- ORCID : 0000-0003-4614-247X
Brice Barret
- Fonction : Auteur
- PersonId : 739068
- IdHAL : brice-barret
- ORCID : 0000-0002-1784-4758
- IdRef : 191155268
Gianluca Pappaccogli
- Fonction : Auteur
- PersonId : 1251239
- ORCID : 0000-0001-8002-6136
Elsa Dieudonné
- Fonction : Auteur
- PersonId : 981460
- IdHAL : elsa-dieudonne
- ORCID : 0000-0001-5320-243X
- IdRef : 167460129
Sarah Albertin
- Fonction : Auteur
- PersonId : 1121417
- ORCID : 0000-0003-1058-3708
- IdRef : 278916937
Slimane Bekki
- Fonction : Auteur
- PersonId : 741080
- IdHAL : slimane-bekki
- ORCID : 0000-0002-5538-0800
- IdRef : 03348824X
Meeta Cesler‐maloney
- Fonction : Auteur
- PersonId : 826801
- ORCID : 0000-0002-2905-549X
Jean-Christophe Raut
- Fonction : Auteur
- PersonId : 175904
- IdHAL : jean-christophe-raut
- ORCID : 0000-0002-3552-2437
- IdRef : 14441970X
François Ravetta
- Fonction : Auteur
- PersonId : 971908
- ORCID : 0000-0002-4264-6235
- IdRef : 144392798
Douglas Keller
- Fonction : Auteur
- PersonId : 1164477
- IdHAL : douglas-keller
- ORCID : 0000-0002-1137-2745
Tjarda J Roberts
- Fonction : Auteur
- PersonId : 737221
- IdHAL : tjr29
- ORCID : 0000-0002-0745-895X
- IdRef : 243213018
Julia Schmale
- Fonction : Auteur
- PersonId : 765758
- ORCID : 0000-0002-1048-7962
Antonio Donateo
- Fonction : Auteur
- PersonId : 1249461
- ORCID : 0000-0002-9214-1067
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.