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Title: On the relative roles of the atmosphere and ocean in the Atlantic Multi-decadal Variability

Abstract

The relative roles of the ocean and the atmosphere in driving the Atlantic Multi-decadal Oscillation (AMO) are investigated by isolating the AMO components forced by anomalous surface heat fluxes and ocean dynamics in a fully- and partially-coupled experiments. The impact of the ocean-dynamics-forced SST on air-sea interaction is disabled in the partially-coupled experiment in order to isolate the atmosphere-forced variability. In the partially-coupled experiment, the ocean-forced AMO component exhibits a strong multi-decadal variability (25- to 50-yr periods), while the atmosphere-forced component has weak multi-decadal variability. This ocean-forced variability is imprinted on the fully-coupled surface heat fluxes, which however, damp the ocean-forced SST variability inducing them, so that the fully-coupled AMO multi-decadal power is only slightly stronger than that forced by the atmosphere alone. Our results suggest that the multi-decadal variability of the AMO is largely driven by ocean dynamics, but its power is also determined by the strength air-sea coupling.

Authors:
ORCiD logo [1];  [1];  [1];  [2];  [1]
  1. BATTELLE (PACIFIC NW LAB)
  2. Ocean University of China
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1593317
Report Number(s):
PNNL-SA-131430
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 45; Journal Issue: 17
Country of Publication:
United States
Language:
English

Citation Formats

Garuba, Oluwayemi A., Lu, Jian, Singh, Hansi AK, Liu, Fukai, and Rasch, Philip J. On the relative roles of the atmosphere and ocean in the Atlantic Multi-decadal Variability. United States: N. p., 2018. Web. doi:10.1029/2018GL078882.
Garuba, Oluwayemi A., Lu, Jian, Singh, Hansi AK, Liu, Fukai, & Rasch, Philip J. On the relative roles of the atmosphere and ocean in the Atlantic Multi-decadal Variability. United States. doi:10.1029/2018GL078882.
Garuba, Oluwayemi A., Lu, Jian, Singh, Hansi AK, Liu, Fukai, and Rasch, Philip J. Sun . "On the relative roles of the atmosphere and ocean in the Atlantic Multi-decadal Variability". United States. doi:10.1029/2018GL078882.
@article{osti_1593317,
title = {On the relative roles of the atmosphere and ocean in the Atlantic Multi-decadal Variability},
author = {Garuba, Oluwayemi A. and Lu, Jian and Singh, Hansi AK and Liu, Fukai and Rasch, Philip J.},
abstractNote = {The relative roles of the ocean and the atmosphere in driving the Atlantic Multi-decadal Oscillation (AMO) are investigated by isolating the AMO components forced by anomalous surface heat fluxes and ocean dynamics in a fully- and partially-coupled experiments. The impact of the ocean-dynamics-forced SST on air-sea interaction is disabled in the partially-coupled experiment in order to isolate the atmosphere-forced variability. In the partially-coupled experiment, the ocean-forced AMO component exhibits a strong multi-decadal variability (25- to 50-yr periods), while the atmosphere-forced component has weak multi-decadal variability. This ocean-forced variability is imprinted on the fully-coupled surface heat fluxes, which however, damp the ocean-forced SST variability inducing them, so that the fully-coupled AMO multi-decadal power is only slightly stronger than that forced by the atmosphere alone. Our results suggest that the multi-decadal variability of the AMO is largely driven by ocean dynamics, but its power is also determined by the strength air-sea coupling.},
doi = {10.1029/2018GL078882},
journal = {Geophysical Research Letters},
number = 17,
volume = 45,
place = {United States},
year = {2018},
month = {9}
}

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