Observations of watermass modification by mesoscale eddies in the subtropical frontal region of the Indian ocean sector of southern ocean

Sabu, P.; George, Jenson V.; Anilkumar, N.; Chacko, Racheal; Valsala, Vinu; Achuthankutty, C.T.

doi:10.1016/j.dsr2.2015.04.010

Cited by 14 publications

(2 citation statements)

References 52 publications

(54 reference statements)

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“…The impacts of MOEs on SSTAs were mainly driven by two processes: the horizontal thermal advection caused by MOE circulation and the vertical thermal advection attributed to the rise and fall associated with MOEs [33,35]. Due to the larger background meridional SST gradient in winter, the horizontal thermal advection by counterclockwise (clockwise) circulations of CEs (AEs) was amplified, more likely producing SSTAs on both sides of MOEs.…”

Section: Surface Wind Speedmentioning

confidence: 99%

Atmospheric Responses to Mesoscale Oceanic Eddies in the Winter and Summer North Pacific Subtropical Countercurrent Region

et al. 2020

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In the winter and summer North Pacific Subtropical Countercurrent region, the atmospheric responses to 20,000+ mesoscale oceanic eddies (MOEs) are examined using satellite and reanalysis data from 1999 to 2013. The composite results indicate that surface wind speed, cloud, and precipitation anomalies are positively correlated with sea surface temperature anomalies in both seasons. The surface wind speed anomalies and convective precipitation anomalies show dipolar structures centering on MOEs in winter and on unipolar structures in summer. In both seasons, the vertical mixing mechanism plays an obvious role in the atmospheric responses to MOEs. In addition, the distributions of sea level pressure anomalies in winter reflects the effects of the pressure adjustment mechanism. Due to the seasonal variations in the atmospheric background state and the MOEs, the sensitivities of surface wind speeds, clouds, and precipitation responses to MOEs in summer are over 30% higher than those in winter.

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Section: Surface Wind Speedmentioning

confidence: 99%

Atmospheric Responses to Mesoscale Oceanic Eddies in the Winter and Summer North Pacific Subtropical Countercurrent Region

et al. 2020

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“…The vertical structures of potential density were weakly stratified, and the thickness of the observed SAE was 150 m (50–200 m) bounded by 35.1 isohaline. Surface‐intensified eddies can influence air‐sea interaction via surface pumping and advection processes, which in turn influence air‐sea interactions (Gaube et al., 2015; Lambaerts et al., 2013; Sabu et al., 2015). Figure 2 shows that the isopycnals of the SAE outcrop at the surface, which means that it could potentially cause surface cooling, and in turn influence air‐sea interactions.…”

Section: Characteristics Of the Subsurface Anticyclonic Eddymentioning

confidence: 99%

A Large Subsurface Anticyclonic Eddy in the Eastern Equatorial Indian Ocean

Peng

et al. 2022

JGR Oceans

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Subsurface eddies are pervasive in the ocean, but those in the eastern equatorial Indian Ocean are not well understood due to the lack of in‐situ observations. Using multiple‐platform observations and reanalysis product, we investigate the characteristics, evolutionary process, origin, and underlying generation mechanism of a subsurface anticyclonic eddy (SAE) in the eastern equatorial Indian Ocean during January‒February 2020. Results show that the horizontal radius of the SAE was slightly greater than 250 km, and the SAE core was located at ∼100‐m depth near the 24.7σ0 isopycnal. This warm, saline and oxygen‐rich SAE was weakly stratified and characterized by tilted lens structures. Further water‐mass tracing analysis indicates that the SAE shifted westward along 4°N with a mean propagation speed of 0.18 m/s from the northwest coast of Sumatra Island. The hydrographic characteristics of the SAE are similar to those of the strong Equatorial Undercurrent, it is speculated that the SAE was probably generated by the north branch flow as the eastward undercurrent reached Sumatra Island. Both lateral shear of undercurrent and conservation of potential vorticity were attributed to the formation of the observed SAE.

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