Inferring Advective Timescales and Overturning Pathways of the Deep Western Boundary Current in the North Atlantic Through Labrador Sea Water Advection

Chomiak, Leah N.; Yashayaev, Igor; Volkov, Denis L.; Schmid, Claudia; Hooper, James A.

doi:10.1029/2022JC018892

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Inferring Advective Timescales and Overturning Pathways of the Deep Western Boundary Current in the North Atlantic Through Labrador Sea Water Advection

2022
By Chomiak, Leah N. ; Yashayaev, Igor ; Volkov, Denis L. ; ...
Source: Journal of Geophysical Research: Oceans, 127, e2022JC018892

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Journal Title:

Journal of Geophysical Research: Oceans
Personal Author:

Chomiak, Leah N. ; Yashayaev, Igor ; Volkov, Denis L. ; Schmid, Claudia ; Hooper, James A.

Chomiak, Leah N. ; Yashayaev, Igor ; Volkov, Denis L. ; Schmid, Claudia ; Hooper, James A. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; AOML (Atlantic Oceanographic and Meteorological Laboratory) ; CIMAS (Cooperative Institute for Marine and Atmospheric Studies)

OAR (Oceanic and Atmospheric Research) ; AOML (Atlantic Oceanographic and Meteorological Laboratory) ; CIMAS (Cooperative Institute for Marine and Atmospheric Studies) Less -
Description:

The Subpolar North Atlantic plays a critical role in the formation of the deep water masses which drive Atlantic Meridional Overturning Circulation (AMOC). Labrador Sea Water (LSW) is formed in the Labrador Sea and exported predominantly via the Deep Western Boundary Current (DWBC). The DWBC is an essential component of the AMOC advecting deep waters southward, flowing at depth along the continental slope of the western Atlantic. By combining sustained hydrographic observations from the Labrador Sea to 26.5°N, we investigate the signal propagation and advective timescales of LSW via the DWBC from its source region to the Tropical Atlantic through various approaches using robust neutral density classifications. Two individually defined LSW classes are observed to advect on timescales that support a new plausible hydrographically observed advective pathway. We find each LSW class to advect on independent timescales, and validate a hypothesized alternative-interior advection pathway branching from the DWBC by observing the arrival of LSW outside of the DWBC in the Bermuda basin on timescales similar to arriving at 26.5°N, 10–15 yr after leaving the source region. Advective timescales estimated herein indicate that this interior pathway is likely the main advective pathway; it remains uncertain whether a direct pathway plays a significant advective role. Using LSW convective signals as advective tracers along the DWBC permits the estimation of advective timescales from the subpolar to tropical latitudes, illuminating deep water advection pathways across the North Atlantic and the lower-limb of AMOC as a whole.
Keywords:

[+]

Ocean Circulation Ocean Currents Advection AMOC Circulation Deep Western Boundary Current Earth And Planetary Sciences (miscellaneous) Geochemistry And Petrology Geophysics Labrador Sea Water Oceanography Space And Planetary Science Timescale
Source:

Journal of Geophysical Research: Oceans, 127, e2022JC018892
DOI:

https://doi.org/10.1029/2022JC018892
Document Type:

Journal Article
Funding:

Grant no. NA20OAR4320472 ; Grant no. NA20OAR4310407

Grant no. NA20OAR4320472 ; Grant no. NA20OAR4310407 Less -
Place as Subject:

Labrador Sea
Rights Information:

CC BY
Compliance:

Submitted
Main Document Checksum:

[+]

urn:sha256:a1668899ade264e726ef2b61360c2cffc6b7e35ce48bf830a73ef1aaa2bf09f0
Download URL:

https://repository.library.noaa.gov/view/noaa/47866/noaa_47866_DS1.pdf
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