Cold air outbreaks in fram strait: climatology, trends, and observations during an extreme season in 2020
- Fram Strait in the northern North Atlantic is a key region for marine cold air outbreaks (MCAOs), southward discharges of polar air under northerly air flow, which have a strong impact on air-sea heat fluxes, boundary layer processes and severe weather. This study investigates climatologies and decadal trends of Fram Strait MCAOs of different intensity classes based on the ERA5 reanalysis product for 1979-2020. Among striking interannual variability, it is shown that the main MCAO season is December through March, when MCAOs occur around 2/3 of the time. We report on significant decadal MCAO decreases in December and January, and a significant increase in March. While the mid-winter decrease is mainly related to the different paces of warming between the surface and the lower atmosphere, the increase in March can be related to changes in synoptic circulation patterns. As an explanation for the latter, a possible feedback between retreating Barents Sea sea ice, enhanced cyclonic activity and Fram Strait MCAOs is postulated.Fram Strait in the northern North Atlantic is a key region for marine cold air outbreaks (MCAOs), southward discharges of polar air under northerly air flow, which have a strong impact on air-sea heat fluxes, boundary layer processes and severe weather. This study investigates climatologies and decadal trends of Fram Strait MCAOs of different intensity classes based on the ERA5 reanalysis product for 1979-2020. Among striking interannual variability, it is shown that the main MCAO season is December through March, when MCAOs occur around 2/3 of the time. We report on significant decadal MCAO decreases in December and January, and a significant increase in March. While the mid-winter decrease is mainly related to the different paces of warming between the surface and the lower atmosphere, the increase in March can be related to changes in synoptic circulation patterns. As an explanation for the latter, a possible feedback between retreating Barents Sea sea ice, enhanced cyclonic activity and Fram Strait MCAOs is postulated. Exemplifying the trend toward stronger MCAOs during March, the study details the recordbreaking MCAO season in early 2020, and an observational case study of an extreme MCAO event in March 2020 is conducted. Thereby, radiosonde observations are combined with kinematic air back-trajectories to provide rare observational evidence for the diabatic cooling and drying during the MCAO preconditioning phase.…
Author details: | Sandro DahlkeORCiDGND, Amélie SolbèsORCiD, Marion MaturilliORCiD |
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DOI: | https://doi.org/10.1029/2021JD035741 |
ISSN: | 2169-897X |
ISSN: | 2169-8996 |
Title of parent work (English): | Journal of geophysical research : atmospheres |
Publisher: | American Geophysical Union |
Place of publishing: | Washington |
Publication type: | Article |
Language: | English |
Date of first publication: | 2022/01/25 |
Publication year: | 2022 |
Release date: | 2023/12/13 |
Tag: | North Atlantic variability; air mass transformation;; cold air outbreak; ocean-atmosphere energy exchange |
Volume: | 127 |
Issue: | 3 |
Article number: | e2021JD035741 |
Number of pages: | 18 |
Funding institution: | Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) within; the Transregional Collaborative Research Center "ArctiC Amplification:; Climate Relevant Atmospheric and SurfaCe Processes, and Feedback; Mechanisms (AC)3" [268020496 - TRR 172]; Projekt DEAL; project; "Quantifying Rapid Climate Change in the Arctic: regional feedbacks and; large-scale impacts (QUARCCS)" - German Ministry of Research and; Education; project "Quantifying Rapid Climate Change in the Arctic:; regional feedbacks and large-scale impacts (QUARCCS)" - Russian Ministry; of Research and Education |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
DDC classification: | 5 Naturwissenschaften und Mathematik / 55 Geowissenschaften, Geologie / 550 Geowissenschaften |
Peer review: | Referiert |
Publishing method: | Open Access / Hybrid Open-Access |
License (German): | CC-BY-NC - Namensnennung, nicht kommerziell 4.0 International |