Observational Evidence of Ventilation Hotspots in the Southern Ocean

Dove, Lilian A.; Thompson, Andrew F.; Balwada, Dhruv; Gray, Alison R.

doi:10.1029/2021jc017178

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Observational Evidence of Ventilation Hotspots in the Southern Ocean

2021
By Dove, Lilian A. ; Thompson, Andrew F. ; Balwada, Dhruv ; ...
Source: Journal of Geophysical Research: Oceans, 126(7)

[PDF-4.94 MB]

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Details:

Journal Title:

Journal of Geophysical Research: Oceans
Personal Author:

Dove, Lilian A. ; Thompson, Andrew F. ; Balwada, Dhruv ; Gray, Alison R.

Dove, Lilian A. ; Thompson, Andrew F. ; Balwada, Dhruv ; Gray, Alison R. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research)
Description:

Standing meanders are a key component of the Antarctic Circumpolar Current (ACC) circulation system, and numerical studies have shown that these features may locally enhance subduction, upwelling, as well as lateral and vertical tracer transport. Yet, observational data from these regions remain sparse. Here, we present results based on measurements made by a group of autonomous platforms sampling an ACC standing meander formed due to the interaction of the Polar Front with the Southwest Indian Ridge. Two Seagliders were deployed alongside a Biogeochemical‐Argo float that was advected through the standing meander. In the high eddy kinetic energy region of the standing meander, the glider observations reveal enhanced submesoscale frontal gradients as well as heightened tracer variability at depth, as compared to the more quiescent region further downstream. Vertical gradients in spice and apparent oxygen utilization are reduced in the standing meander despite similarities in the large‐scale vertical stratification, suggesting greater ventilation of the surface ocean. These observations are consistent with numerical studies that highlight standing meanders as hotspots for ventilation and subduction due to enhanced mesoscale stirring and submesoscale vertical velocities. Our results emphasize the need to account for spatial heterogeneity in processes influencing air‐sea exchange, carbon export, and biogeochemical cycling in the Southern Ocean.
Keywords:

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Earth And Planetary Sciences (miscellaneous) Geochemistry And Petrology Geophysics Oceanography Space And Planetary Science
Source:

Journal of Geophysical Research: Oceans, 126(7)
DOI:

https://doi.org/10.1029/2021jc017178
ISSN:

2169-9275;2169-9291;
Format:

PDF
Publisher:

American Geophysical Union (AGU)
Document Type:

Journal Article
Funding:

Grant no. NA15OAR4320063 ; Grant no. NA17RJ1232341

Grant no. NA15OAR4320063 ; Grant no. NA17RJ1232341 Less -
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Library
Main Document Checksum:

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urn:sha256:3afe72c2ef69ef3f5a2fb42ea76702aa3bced668659e7667dbd6e62a32011edd
Download URL:

https://repository.library.noaa.gov/view/noaa/59654/noaa_59654_DS1.pdf
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