A Lagrangian analysis of midlatitude air-sea interaction associated with mesoscale oceanic eddies
In this study, we carry out a Lagrangian analysis of the atmospheric response to mesoscale eddies in the Gulf Stream region of the North Atlantic. An objective eddy-recognition algorithm based on sea surface height data is used to identify oceanic features in eddy-resolving coupled simulations carried out using both the NCAR CESM and a coupling of WRF-ARW with ROMS. The atmospheric state overlying the cyclonic and anticyclonic ocean eddies is composited separately to assess the impact of the different SST anomalies on the atmospheric boundary layer. Our analysis shows that anticyclonic eddies have a clear atmospheric signature, with warmer SST associated with increased precipitation, stronger surface winds, and greater boundary layer heights. Cyclonic eddies show the opposite pattern compared to a weighted mean.