Mesoscale eddies play a key role in regulating oceanic physical and biogeochemical environments. However, their influence on vertical oxygen distribution remains poorly constrained by observations. Using 32 years (1993–2024) of in situ oxygen observations from the Bermuda Atlantic Time‐series Study site combined with satellite‐tracked eddies, we show that eddy‐induced oxygen anomalies are substantially stronger in the mesopelagic than at the surface. Anticyclonic eddies deepen the subsurface oxygen minimum layer (OML) by ∼100 m and reduce its thickness by ∼30%, with increases of ∼3%–6% in mean and minimum oxygen. Cyclonic eddies induce a similar but weaker thinning, accompanied by an upward displacement of about 100 m. More than 80% of the variance is explained by isopycnal heaving, with additional contributions from biogeochemical processes. Our results underscore that both eddy types systematically alleviate low‐oxygen conditions within the OML, with important implications for subsurface oxygen habitat variability.
North Pacific Subtropical Mode Water (STMW) is one of the largest ventilated water masses in the world's oceans, with a thickness of a few hundred meters, occupying a broad region over the North Pacific subtropical gyre. Formed in the deep winter mixed layer south of the Kuroshio Extension, STMW transports heat, ox...
S. Sugimoto· Journal of Geophysical Resea...· 0 citations
Abstract. The North Pacific Intermediate Water (NPIW) plays an important role in regulating thermohaline structure and biogeochemical distributions in the North Pacific. However, limited continuous observations have hindered our understanding of its short-term variability and structural response to mesoscale processes....
This study investigates how a subsurface dipole eddy modulates phytoplankton biomass, expressed as chlorophyll-
a
(Chl-
a
) concentrations, in the southern Gulf of Mexico. The analysis is based on high-resolution hydrographic and biogeochemical observations collected during an oceanographic cruise in June 2015. T...
D. Salas‐de‐León, E. Durán-Campos, Erik Coria-Monter et al.· Frontiers in Marine Science· 0 citations
Utilizing two-dimensional sea level anomalies from the Surface Water and Ocean Topography (SWOT) wide-swath altimeter, we conduct a global census of fine-scale eddies (with equivalent radii < 30 km) that are beyond the resolution capacity of traditional altimeters. We find that these eddies are concentrated in regions...
Oxygen concentrations are of fundamental importance for organisms and geochemical cycling in the oceans. Since the middle of the 20th century, oxygen concentrations have been declining in the open ocean and the coastal ocean, with implications for productive ecosystems. The northwest Atlantic (NWA) shelf from the coast...
Hung Quach Nguyen, S. Siedlecki, Enrique N. Curchitser et al.· Environmental Research Lette...· 0 citations
The Kuroshio Extension is one of the most energetic frontal systems in the World Ocean, separating subtropical and subarctic water masses. Mesoscale eddies regularly cross this front, enabling cross-jet transport of heat, salt, and hydrographic properties despite the barrier nature of the jet. Previous studies have mai...
A. Didov, P. A. Bondarchuk, M. E. Sivtsova et al.· The Physics of Fluids· 0 citations
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