Cold Air Outbreaks in Fram Strait: Climatology, Trends, and Observations During an Extreme Season in 2020. Issue 3 (9th February 2022)

• Record Type: Journal Article
• Authors: Dahlke, Sandro; Solbès, Amélie; Maturilli, Marion
• Is Part Of: Journal of geophysical research. Volume 127:Issue 3(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-02-09
• Subjects: cold air outbreak -- North Atlantic variability -- air mass transformation -- ocean‐atmosphere energy exchange; Atmospheric physics -- Periodicals; Geophysics -- Periodicals; 551.5
• DOI: 10.1029/2021JD035741
• Languages: English
• ISSNs: 2169-897X

Abstract

Abstract: 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. Key Points: 1979–2020 climatology of marine cold air outbreaks (MCAOs) in Fram Strait Significant MCAO increase in March is dynamically driven; significant decrease in mid‐winter due to vertical distribution of warming Anomalous circulation in February/March 2020 yields extreme MCAO season with observed air mass preconditioning