The Effects of the Large Scale Synoptic fields in the High Latitude PBL states.
- 1University of Alaska Fairbanks, Fairbanks, AK, USA,
- 2LMD, Palaiseau, FR,
- 3Université du Littoral Côte d’Opale, Dunkerque, FR,
- 4Laboratoire Atmosphères, Milieux, Observations Spatiales, Sorbonne Université / Université Versailles Saint Quentin / CNRS, Paris, FR,
- 5CNRS, Paris, FR
- 6University of Victoria, Victoria, BC, CA,
- 7NASA, Greenbelt, MD, USA
Polar and sub-polar winters represent outstanding opportunities to study the PBL state in connection to the synoptic meteorological fields. In the high latitudes, the absence of a diurnal cycle combined with the presence of an anticyclone feature promotes surface radiative cooling resulting in the formation of a surface based temperature inversion (stably-stratified structure). Under such meteorological conditions, large scale subsidence promotes adiabatic compression (i.e., warming in upper levels) promoting the formation of elevated temperature inversions layers. This multilayered configuration represents a significant challenge for micro-scale/mesoscale modeling and air pollution dispersion as well as for the transport of the local contamination to the global arctic air shed. However, this structure is fragile and can be disrupted by dynamic and radiative effects caused by synoptic variability affecting the PBL state. Thus, significant changes in the PBL state are verified when synoptic situation changes (i.e, warm air advections and more mesoscale frontogenesis).
In this contribution, we describe the state of the PBL linked to the synoptic large scale variability using the high resolution thermodynamic profiling datasets from the 2022 ALPACA field experiment in Fairbanks, Alaska. High resolution synoptic scale reanalysis datasets are used to detail dynamic processes coupled to atmospheric dynamics in the PBL state.-
How to cite: Fochesatto, G. J., Keller, D., Dieudonné, E., Brett, N., Law, K., Bekki, S., Atkinson, D., Wellton, E., and Peterson, E.: The Effects of the Large Scale Synoptic fields in the High Latitude PBL states., EGU General Assembly 2023, Vienna, Austria, 23–28 Apr 2023, EGU23-17118, https://doi.org/10.5194/egusphere-egu23-17118, 2023.
