Publication Abstracts

Roach et al. 2022, accepted

Roach, L.A., E. Blanchard-Wrigglesworth, S. Ragen, W. Cheng, K.C. Armour, and C.M. Bitz, 2022: The impact of winds on AMOC in a fully-coupled climate model. Geophys. Res. Lett., accepted.

Here we investigate the role of the atmospheric circulation in AMOC by comparing a fully-coupled large ensemble, a forced-ocean simulation, and new experiments using a fully-coupled global climate model where winds above the boundary layer are nudged towards reanalysis. When winds are nudged north of 45°N, agreement with RAPID array observations of AMOC at 26.5°N improves across several metrics. The phasing of interannual variability is well-captured due to the response of the local Ekman component in both wind-nudging and forced-ocean simulations, however the variance remains underestimated. The mean AMOC strength is substantially reduced relative to the fully-coupled model large ensemble, which is biased high, due to the impact of winds on surface buoyancy fluxes over the subpolar gyre. Nudging winds towards observations also reduces the 1979-2016 trend in AMOC, suggesting that improvement in the representation of the high-latitude atmosphere is important for projecting long-term AMOC changes.

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BibTeX Citation

@unpublished{ro07810f,
  author={Roach, L. A. and Blanchard-Wrigglesworth, E. and Ragen, S. and Cheng, W. and Armour, K. C. and Bitz, C. M.},
  title={The impact of winds on AMOC in a fully-coupled climate model},
  year={2022},
  journal={Geophys. Res. Lett.},
}

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RIS Citation

TY  - INPR
ID  - ro07810f
AU  - Roach, L. A.
AU  - Blanchard-Wrigglesworth, E.
AU  - Ragen, S.
AU  - Cheng, W.
AU  - Armour, K. C.
AU  - Bitz, C. M.
PY  - 2022
TI  - The impact of winds on AMOC in a fully-coupled climate model
JA  - Geophys. Res. Lett.
ER  -

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