AMOC variability and watermass transformations in the AWI climate model


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dmitry.sidorenko [ at ] awi.de

Abstract

Using the depth (z) and density (ϱ) frameworks, we analyze local contributions to AMOC variability in a 900-year simulation with the AWI climate model. Both frameworks reveal a consistent interdecadal variability; however, the correlation between their maxima deteriorates on year-to-year scales. We demonstrate the utility of analyzing the spatial patterns of sinking and diapycnal transformations through depth levels and isopycnals. The success of this analysis relies on the spatial binning of these maps which is especially crucial for the maps of vertical velocities which appear to be too noisy in the main regions of up- and downwelling because of stepwise bottom topography. Furthermore, we show that the AMOC responds to fast (annual or faster) fluctuations in atmospheric forcing associated with the NAO. This response is more obvious in the ϱ than in the z framework. In contrast, the link between AMOC deep water production south of Greenland is found for slower fluctuations and is consistent between the frameworks.



Item Type
Article
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Helmholtz Cross Cutting Activity (2021-2027)
Research Networks
Peer revision
ISI/Scopus peer-reviewed
Publication Status
Published
Eprint ID
54687
DOI 10.1029/2021MS002582

Cite as
Sidorenko, D. , Danilov, S. , Streffing, J. , Fofonova, V. , Goessling, H. , Scholz, P. , Wang, Q. , Androsov, A. , Cabos, W. , Juricke, S. , Koldunov, N. , Rackow, T. , Sein, D. and Jung, T. (2021): AMOC variability and watermass transformations in the AWI climate model , Journal of Advances in Modeling Earth Systems . doi: 10.1029/2021MS002582


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Funded by
H2020-BG-2016-1


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