The weakly stratified bottom boundary layer (wsBBL) of the global oceans is currently unmapped; even the definition of the wsBBL layer is yet lacking. However, recent studies point to the wsBBL as a region where most of the abyssal water transformation takes place. In this study, historical high-resolution density profiles are used to map the properties of the wsBBL in the global ocean. The thickness of the estimated wsBBL vary from several meters to over thousands of meters, and can be used as a rule of thumb to differentiate basin walls from the basin bottom. Although the thickness varies greatly, the pressure at the top of the wsBBL varies relatively smoothly allowing us to map its distribution across the ocean along with the density of the wsBBL. The density and pressure of the upper boundary of the wsBBL are highly correlated within each ocean basin. Both properties are used to differentiate the ocean basins and highlight large scale hotspots of mixing, such as inter-basin channels and parts of mid-ocean ridges.
Tuesday 27 March 2018 - 15:00
Other venue (see below for details).
NOC/166/27 (Lab G2)