Document Type

Data Set

Publication Date

2019

Keywords

Geostrophy, Absolute Geostrophic Velocity, North Atlantic, Mean Ocean Circulation

DOI

10.17604/cf5z-x124

Abstract

North Atlantic observed climatological mean absolute geostrophic velocity components in meters per second from near the surface (pressure = 2.5 dbar) to near ocean bottom (pressure = 5562.0 dbar). The absolute velocity fields in the upper 2000 dbar of the water column were obtained by referencing an ARGO based mean geostrophic shear with mean velocity estimates at 1000 dbar between 2004-2016. The shear was derived using the so-called Roemmich-Gilson Argo climatology (Roemmich & Gilson, 2009). The referencing procedure was conducted using Argo displacement data referred to as YoMaHa'07 (Lebedev et al., 2007). For regions deeper than 2000 dbar, the velocity profiles were "extrapolated" using the geostrophic shear estimated from the World Ocean Atlas 2013 (WOA13) climatological dataset. The detailed methodology and uncertainty analysis is presented in Biló & Johns (2019).

Comments

The dataset consist of a netCDF file with 7 variables: (1) u = eastward velocity component (m/s); (2) v = northward velocity component (m/s); (3) u_se = eastward velocity uncertainty based on the temperature, salinity, and reference velocity standard errors of the mean (m/s); (4) v_se = northward velocity uncertainty based on the temperature, salinity, and reference velocity standard errors of the mean (m/s); (5) longitude in degrees east; (6) latitude in degrees north; and (7) pressure in dbar.

RELATED TO:

Biló, T. C., & Johns, W. E. (2019). Interior pathways of Labrador Sea Water in the North Atlantic from the Argo perspective. Geophysical Research Letters, 46(6), 3340-3348. https://doi.org/10.1029/2018GL081439

LICENSE:

This data is made available under the Open Data Commons Attribution License: http://opendatacommons.org/licenses/by/

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