TY  - JOUR
A1  - Dahlke, Sandro
A1  - Solbès, Amélie
A1  - Maturilli, Marion
T1  - Cold air outbreaks in fram strait: climatology, trends, and observations during an extreme season in 2020
JF  - Journal of geophysical research : atmospheres
N2  - 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.
KW  - cold air outbreak
KW  - North Atlantic variability
KW  - air mass transformation;
KW  - ocean-atmosphere energy exchange
Y1  - 2022
U6  - https://doi.org/10.1029/2021JD035741
SN  - 2169-897X
SN  - 2169-8996
VL  - 127
IS  - 3
PB  - American Geophysical Union
CY  - Washington
ER  -