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Atmospheric transient eddies and low-frequency flow contribution to the oceansurface wave climate in the North Atlantic during boreal winter is investigated(1980 - 2016). We conduct a set of numerical simulations with astate-of-the-art spectral wave model Wavewatch III forced by decomposed windfields derived from the ERA-Interim reanalysis (0.7{\deg} horizontalresolution). Synoptic-scale processes (2-10 day bandpassed winds) are found tohave the largest impact on the formation of wind waves in the westernmid-latitude North Atlantic along the North American and western Greenlandcoasts. The eastern North Atlantic is found to be influenced by the combinationof low-frequency forcing (>10 day bandpassed winds) contributing up to 60% andsynoptic processes contributing up to 30% to mean wave heights. Mid-latitudestorm track variability is found to have a direct relationship with wave heightvariability on the eastern and western margins of the North Atlantic inparticular implying an association between cyclone formation over the NorthAmerican Eastern Seaboard and wave heights anomalies in the eastern NorthAtlantic. A shift in wave height regimes defined using an EOF analysis isreflected in the occurrence anomalies in their distribution. Results highlightthe dominant role of transient eddies on the ocean surface wave climatology inthe mid-latitude eastern North Atlantic both locally and through associationwith cyclone formation in the western part of the basin. These conclusions arepresented and discussed particularly within the context of long-termstorm-track shifts projected as a possible response to climate warming over thecoming century.

Ocean Wind Wave Climate Responses to Wintertime North Atlantic Atmospheric Transient Eddies and Low Frequency Flow