the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
3D reconstruction of horizontal and vertical quasi-geostrophic currents in the North Atlantic Ocean
Sarah Asdar
Daniele Ciani
Bruno Buongiorno Nardelli
Abstract. In this paper we introduce a new high-resolution (1/10°) data-driven dataset of 3D ocean currents developed by the National Research Council of Italy in the framework of the European Space Agency World Ocean Circulation project: the WOC-NATL3D dataset. The product domain extends over a wide portion of the North Atlantic Ocean from the surface down to 1500 m depth, and the dataset covers the period between 2010 and 2019. To generate this product, a diabatic quasi-geostrophic diagnostic model is applied to data-driven 3D temperature and salinity fields obtained through a deep learning technique, along with ERA5 fluxes and empirical estimates of the horizontal Ekman currents based on input provided by the European Copernicus Marine Service. The assessment of WOC-NATL3D currents is performed by direct validation of the total horizontal velocities with independent drifter estimates at various depths (0, 15 and 1000 m) and by comparing them with existing reanalyses that are obtained through the assimilation of observations into ocean general circulation numerical models. Our estimates of the ageostrophic components of the flow improve the total horizontal velocity reconstruction, being more accurate and closer-to-observations than model reanalyses in the upper layers, also providing an indirect proof of the reliability of the resulting vertical velocities. The reconstructed WOC-NATL3D currents are freely available at https://www.worldoceancirculation.org/Products#/metadata/0aa7daac-43e6-42f3-9f95-ef7da46bc702 (Buongiorno Nardelli, 2022).
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Sarah Asdar et al.
Status: open (until 16 Dec 2023)
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RC1: 'General comment on essd-2023-388', Anonymous Referee #1, 16 Nov 2023
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General comments :
This document describes the 3D ocean current dataset developed in the framework of the World Ocean Circulation project (ESA funded) and named WOC-NATL3D.
The dataset extends over the North Atlantic, from the surface to 1500 m depth at a 1/10° spatial resolution on a daily basis. The dataset contains horizontal and vertical velocity, as well as temperature and salinity fields from 2010 to 2019.
A deep learning algorithm is used to compute 3D T/S fields which then feeds a diabatic quasi-geostrophic equation together with ERA5 fluxes and horizontal Ekman currents estimates.
This product has been developed to fit the purpose of fishery applications that need higher spatial resolution vertical velocity.
This article is well written, pleasant to read and well structured. However, we are still left wanting more information about validation. It does not clearly answer the question of the validity of the WOC-NATL3D vertical velocity:
- Some figures request more discussion in the text. The authors referred to publications describing the method, but more details could have been provided in the text for a better comprehension.
- All the validation is performed on current intensity. There is no indication on the validation of direction of the current, neither on WOC-NATL3D nor the other reanalysis dataset. Vertical velocity is related to divergence of the horizontal flow but no validation of the zonal nor meridional component is shown here. Can the authors provide some justification for this choice or provide some more validation results?
More specific comments are listed in the supplement file.
Sarah Asdar et al.
Data sets
North Atlantic Data-Driven 3D Currents, Temperature and Salinity from ESA WOC project. Ver. 2.0 B. Buongiorno Nardelli https://www.worldoceancirculation.org/Products#/metadata/0aa7daac-43e6-42f3-9f95-ef7da46bc702
Sarah Asdar et al.
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