Middepth decadal warming and freshening in the South Atlantic

Giglio, Donata; Johnson, Gregory C.

doi:10.1002/2016JC012246

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i

Middepth decadal warming and freshening in the South Atlantic

2017
By Giglio, Donata ; Johnson, Gregory C.
Source: Journal of Geophysical Research-Oceans, 122(2), 973-979.

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Journal Title:

Journal of Geophysical Research: Oceans
Personal Author:

Giglio, Donata ; Johnson, Gregory C.

Giglio, Donata ; Johnson, Gregory C. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; PMEL (Pacific Marine Environmental Laboratory) ; JISAO (Joint Institute for the Study of the Atmosphere and Ocean)

OAR (Oceanic and Atmospheric Research) ; PMEL (Pacific Marine Environmental Laboratory) ; JISAO (Joint Institute for the Study of the Atmosphere and Ocean) Less -
Description:

South Atlantic Ocean middepth water property (temperature, salinity, oxygen, nutrients, etc.) distributions are set by salty, well-ventilated, and relatively nutrient-poor North Atlantic Deep Water (NADW) spreading southward toward the Southern Ocean underneath fresher, well-ventilated, and relatively nutrient-poor northward spreading Antarctic Intermediate Water (AAIW). The layer between the NADW and AAIW is oxygen-poor and nutrient-rich, with small vertical temperature gradients. Salinity stratification dominates the vertical density gradient, hence the layer is referred to as Salinity Stratified Layer (SSL). Decadal warming (0.044 degrees C decade(-1)) and freshening (0.006 g kg(-1) decade(-1)) of this layer are analyzed using Argo data, a climatology, and repeat hydrographic sections. Warming within the SSL accumulates heat at a rate of similar to 20 TW, is unlikely to be caused by vertical heave, and is consistent with anomalous southward advection of order 10(2) km decade(-1) in the Atlantic Meridional Overturning Circulation. Salinity changes within the SSL are consistent with a downward velocity anomaly of order 10 m decade(-1).
Source:

Journal of Geophysical Research-Oceans, 122(2), 973-979.
DOI:

https://doi.org/10.1002/2016JC012246
Document Type:

Journal Article
Funding:

Grant no. NA15OAR4320063
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urn:sha256:f78f5afbcc71b11c84f51d58c0260795bb0af3b9fad32980f01f61859488a154
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Middepth decadal warming and freshening in the South Atlantic

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