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Response of the Atmospheric Boundary Layer to Submesoscale Sea Surface Temperature Fronts
Author(s) -
Wenegrat J. O.,
Arthur R. S.
Publication year - 2018
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2018gl081034
Subject(s) - frontogenesis , planetary boundary layer , geology , mixed layer , sea surface temperature , boundary layer , potential vorticity , potential temperature , wind stress , boundary current , vorticity , atmospheric sciences , climatology , oceanography , ocean current , meteorology , vortex , mechanics , mesoscale meteorology , physics
Submesoscale sea surface temperature fronts are ubiquitous throughout much of the global ocean; however, the response of the marine atmospheric boundary layer (MABL) to the ocean submesoscale is not well understood. In this manuscript large‐eddy simulation is used to explore the time‐dependent response of the MABL to idealized submesoscale sea surface temperature fronts, with an emphasis on how the dynamics of the MABL determine the strength and position of gradients in wind speed and air temperature. Results suggest that horizontal mixing only becomes important in response to frontogenesis by horizontally convergent ageostrophic flows, contrary to the common assumption that the MABL response will be strongly dependent on horizontal turbulent mixing. The fronts that develop in the MABL are also associated with large vertical relative vorticity, suggesting the possibility that submesoscale fronts may induce inertial instability in the MABL. These results provide guidance for high‐resolution ocean and atmosphere modeling and for interpreting observations.