G-YoMaHa (Objectively mapped velocity at 1000 dbar derived from trajectories of Argo floats)


We mapped the drift data from the Argo floats, YoMaHa'07 (version September 2012), at the depth of 1000 dbar (approximately 1000 m) on a 1 degree grid. The mapping method is statistically optimal. The mapped velocity field satisfies the geostrophic balance and the horizontal boundary condition of no flow through the boundary.


Data setPrior to the March 2012 version, the eastward velocity and its uncertainty had significant errors owing to a bug in the geostrophic calculation. Please use the versions released after Jan 2012.