Decreased Stratification in the Abyssal Southwest Pacific Basin and Implications for the Energy Budget

Zhang, Helen J.; Whalen, Caitlin B.; Kumar, Nirnimesh; Purkey, Sarah G.

doi:10.1029/2021gl094322

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Decreased Stratification in the Abyssal Southwest Pacific Basin and Implications for the Energy Budget

2021
By Zhang, Helen J. ; Whalen, Caitlin B. ; Kumar, Nirnimesh ; ...
Source: Geophysical Research Letters, 48(19)

[PDF-1.62 MB]

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Details:

Journal Title:

Geophysical Research Letters
Personal Author:

Zhang, Helen J. ; Whalen, Caitlin B. ; Kumar, Nirnimesh ; Purkey, Sarah G.

Zhang, Helen J. ; Whalen, Caitlin B. ; Kumar, Nirnimesh ; Purkey, Sarah G. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research)
Description:

As the abyssal oceans warm, stratification is also expected to change in response. This change may impact mixing and vertical transport by altering the buoyancy flux, internal wave generation, and turbulent dissipation. In this study, repeated surveys of three hydrographic sections in the Southwest Pacific Basin between the 1990s and 2010s are used to estimate the change in buoyancy frequency . We find that below the °C isotherm, is on average reduced by a scaling factor of , a 12% reduction, per decade that intensifies with depth. At °C, we observe the biggest change: , or a 29% reduction per decade. Within the same period, the magnitude of vertical diffusive heat flux is also reduced by about , although this estimate is sensitive to the choice of estimated diffusivity. Finally, implications of these results for the heat budget and global ocean circulation are qualitatively discussed.
Keywords:

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General Earth And Planetary Sciences Geophysics
Source:

Geophysical Research Letters, 48(19)
DOI:

https://doi.org/10.1029/2021gl094322
ISSN:

0094-8276;1944-8007;
Format:

PDF
Publisher:

American Geophysical Union (AGU)
Document Type:

Journal Article
Funding:

Grant no. NA15OAR4320071
License:

https://creativecommons.org/licenses/by/4.0/
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CC BY
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Library
Main Document Checksum:

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urn:sha256:ac48a7957249b97e278ceadd27c22d56368551f604420b2a4674282b649c1007
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https://repository.library.noaa.gov/view/noaa/58449/noaa_58449_DS1.pdf
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