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https://doi.org/10.5194/egusphere-2025-89
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/egusphere-2025-89
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Status: this preprint is open for discussion and under review for Ocean Science (OS).
Determining the depth and pumping speed of the equatorial Ekman layer from surface drifter trajectories
Abstract. Trajectories of more than 500 drogued surface drifters launched since 1979 in the equatorial ocean are analyzed by employing the results of a new Lagrangian theory of wind-driven transport along the equator forced by the prevailing Trade winds. The analysis yields robust estimates of 45 meters for the Ekman layer’s depth and 1.0 meters/day for the upwelling speed of deep water into the layer.
How to cite. Paldor, N. and De-Leon, Y.: Determining the depth and pumping speed of the equatorial Ekman layer from surface drifter trajectories, EGUsphere [preprint], https://doi.org/10.5194/egusphere-2025-89, 2025.
Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
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Nathan Paldor
CORRESPONDING AUTHOR
Fredy and Nadine Herrmann Institute of Earth Sciences, Hebrew University of Jerusalem, Edmond J. Safra Campus, Givat Ram, Jerusalem, 9190401 Israel
Yair De-Leon
Fredy and Nadine Herrmann Institute of Earth Sciences, Hebrew University of Jerusalem, Edmond J. Safra Campus, Givat Ram, Jerusalem, 9190401 Israel
Short summary
The study combines archived surface drifter trajectories along the equator with a novel extension of Ekman's wind-driven theory to the equatorial β-plane to estimate the depth the equatorial Ekman layer and the speed of upwelling into it.
The study combines archived surface drifter trajectories along the equator with a novel...