Remote influence of Interdecadal Pacific Oscillation on the South Atlantic meridional overturning circulation variability

Lopez, Hosmay; Dong, Shenfu; Lee, Sang‐Ki; Campos, Edmo

doi:10.1002/2016gl069067

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Remote influence of Interdecadal Pacific Oscillation on the South Atlantic meridional overturning circulation variability

2016
By Lopez, Hosmay ; Dong, Shenfu ; Lee, Sang‐Ki ; ...
Source: Geophysical Research Letters, 43(15), 8250-8258.

[PDF-2.93 MB]

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Journal Title:

Geophysical Research Letters
Personal Author:

Lopez, Hosmay ; Dong, Shenfu ; Lee, Sang‐Ki ; Campos, Edmo

Lopez, Hosmay ; Dong, Shenfu ; Lee, Sang‐Ki ; Campos, Edmo Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; CIMAS (Cooperative Institute for Marine and Atmospheric Studies)

OAR (Oceanic and Atmospheric Research) ; CIMAS (Cooperative Institute for Marine and Atmospheric Studies) Less -
Description:

This study explores potential factors that may influence decadal variability of the South Atlantic meridional overturning circulation (SAMOC) by using observational data as well as surface-forced ocean model runs and a fully coupled climate model run. Here we show that SAMOC is strongly correlated with the leading mode of sea surface height (SSH) variability in the South Atlantic Ocean, which displays a meridional dipole between north and south of 20 degrees S. A significant portion (similar to 45%) of the South Atlantic SSH dipole variability is remotely modulated by the Interdecadal Pacific Oscillation (IPO). Further analysis shows that anomalous tropical Pacific convection associated with the IPO forces robust stationary Rossby wave patterns, modulating the wind stress curl over the South Atlantic Ocean. A positive (negative) phase IPO increases (decreases) the westerlies over the South Atlantic, which increases (decreases) the strength of the subtropical gyre in the South Atlantic and thus the SAMOC.
Source:

Geophysical Research Letters, 43(15), 8250-8258.
DOI:

https://doi.org/10.1002/2016gl069067
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Journal Article
Funding:

Grant no. NA10OAR4320143
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urn:sha256:6c521fc2281b3b6ea28e8ee29da779fac7d3cb732677d798ef4e69d4ab4e8847
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https://repository.library.noaa.gov/view/noaa/20513/noaa_20513_DS1.pdf
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Remote influence of Interdecadal Pacific Oscillation on the South Atlantic meridional overturning circulation variability

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