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Journal Article

Multidecadal Atlantic “Warming Hole” Heat Content Variations Are Caused by Ocean Heat Transport, Not by Surface Fluxes

Authors
/persons/resource/Stefan.Rahmstorf

Rahmstorf,  Stefan       
Potsdam Institute for Climate Impact Research;

/persons/resource/Jan.Jendrkowiak

Jendrkowiak,  Jan
Potsdam Institute for Climate Impact Research;

/persons/resource/Ruijian.Gou

Gou,  Ruijian
Potsdam Institute for Climate Impact Research;

Cheng,  Lijing
External Organizations;

Ruiz‐Angulo,  Angel
External Organizations;

Björnsson,  Halldór
External Organizations;

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34614oa.pdf
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Citation

Rahmstorf, S., Jendrkowiak, J., Gou, R., Cheng, L., Ruiz‐Angulo, A., Björnsson, H. (2026): Multidecadal Atlantic “Warming Hole” Heat Content Variations Are Caused by Ocean Heat Transport, Not by Surface Fluxes. - Geophysical Research Letters, 53, 11, e2025GL118383.
https://doi.org/10.1029/2025GL118383


Cite as: https://publications.pik-potsdam.de/pubman/item/item_34614
Abstract
The northern Atlantic south of Greenland and Iceland is the only part of the world which has cooled significantly since the 19th Century both in the atmosphere and ocean. The oceanic cooling is widely assumed to be a result of reduced ocean heat transport into this region. However, some studies have suggested it could be due to increased net heat loss at the sea surface. Here we use observation-based reanalysis data of ocean heat content and surface flux changes in this region to show that the observed cooling trend cannot be explained by surface heat flux changes, and that multidecadal heat content variations are generally larger and more tightly correlated with ocean heat transport than with surface heat flux variability.