Multidecadal Intensification of Atlantic Tropical Instability Waves

Tuchen, Franz Philip; Perez, Renellys C.; Foltz, Gregory R.; Brandt, Peter; Lumpkin, Rick

doi:10.1029/2022GL101073

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i

Multidecadal Intensification of Atlantic Tropical Instability Waves

2022
By Tuchen, Franz Philip ; Perez, Renellys C. ; Foltz, Gregory R. ; ...
Source: Geophysical Research Letters, 49, e2022GL101073

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Details:

Journal Title:

Geophysical Research Letters
Personal Author:

Tuchen, Franz Philip ; Perez, Renellys C. ; Foltz, Gregory R. ; Brandt, Peter ; Lumpkin, Rick

Tuchen, Franz Philip ; Perez, Renellys C. ; Foltz, Gregory R. ; Brandt, Peter ; Lumpkin, Rick Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; AOML (Atlantic Oceanographic and Meteorological Laboratory)

OAR (Oceanic and Atmospheric Research) ; AOML (Atlantic Oceanographic and Meteorological Laboratory) Less -
Description:

Tropical Instability Waves (TIWs) are the dominant source of intraseasonal variability in the central equatorial Atlantic and play an important role in the redistribution of heat in the upper ocean. Here we use multidecadal records of sea surface temperature, sea level anomaly, sea surface salinity, and near-surface currents constructed from in situ and satellite observations to reveal a long-term intensification of the intraseasonal variability of these variables due to an increase of TIW activity. Enhanced barotropic energy conversion from increased covariance of horizontal current fluctuations, rather than low-frequency changes of the mean zonal currents, drives the TIW intensification. As a consequence, boreal summer cooling of tropical North Atlantic surface waters through horizontal eddy temperature advection increased by 0.03°C month−1 decade−1 during 1993–2021, a change of 74% ± 53% relative to the long-term mean. The presented multidecadal TIW trends are strongly modulated by interannual variations like the 2021 Atlantic Niño.
Keywords:

[+]

Climatic Changes Ocean Salinity Ocean Temperature Sea Level Climate Variability Decadal Variability General Medicine Ocean Observations Tropical Atlantic Ocean Tropical Instability Waves Upper-ocean Processes
Source:

Geophysical Research Letters, 49, e2022GL101073
DOI:

https://doi.org/10.1029/2022GL101073
Document Type:

Journal Article
Funding:

Grant no. 100007298
Place as Subject:

Atlantic Ocean
Rights Information:

Other
Compliance:

Submitted
Main Document Checksum:

[+]

urn:sha256:c5ab915ff3918f86c0561ad5848b08ac34ec61ad767bc989998269b5b3fa7bcc
Download URL:

https://repository.library.noaa.gov/view/noaa/47743/noaa_47743_DS1.pdf
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[PDF-1.26 MB]

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