Regional imprints of changes in the Atlantic Meridional Overturning Circulation in the eddy-rich ocean model VIKING20X

• Published in: Ocean Science
• Main Authors: A. Biastoch, F. U. Schwarzkopf, K. Getzlaff, S. Rühs, T. Martin, M. Scheinert, T. Schulzki, P. Handmann, R. Hummels, C. W. Böning
• Format: Article in Journal/Newspaper
• Language: English
• Published: Copernicus Publications 2021
• Subjects: Geography. Anthropology. Recreation; G; Environmental sciences; GE1-350; Sea ice
• Online Access: https://doi.org/10.5194/os-17-1177-2021; https://doaj.org/article/a0b7c80c32aa4f6395249b468139b5da

A hierarchy of global <math xmlns="http://www.w3.org/1998/Math/MathML" id="M1" display="inline" overflow="scroll" dspmath="mathml"><mrow><mn mathvariant="normal">1</mn><mo>/</mo><mn mathvariant="normal">4</mn></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="20pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="f7b7a5d5bfd5c45cef6c295312dc1896"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="os-17-1177-2021-ie00001.svg" width="20pt" height="14pt" src="os-17-1177-2021-ie00001.png"/></svg:svg> ∘ (ORCA025) and Atlantic Ocean <math xmlns="http://www.w3.org/1998/Math/MathML" id="M3" display="inline" overflow="scroll" dspmath="mathml"><mrow><mn mathvariant="normal">1</mn><mo>/</mo><mn mathvariant="normal">20</mn></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="27pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="7daf596888cf22979f9f8ece1dd1680a"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="os-17-1177-2021-ie00002.svg" width="27pt" height="14pt" src="os-17-1177-2021-ie00002.png"/></svg:svg> ∘ nested (VIKING20X) ocean–sea-ice models is described. It is shown that the eddy-rich configurations performed in hindcasts of the past 50–60 years under CORE and JRA55-do atmospheric forcings realistically simulate the large-scale horizontal circulation, the distribution of the mesoscale, overflow and convective processes, and the representation of regional current systems in the North and South Atlantic. The representation of the Atlantic Meridional Overturning Circulation (AMOC), and in particular the long-term temporal evolution, strongly depends on numerical choices for the application of freshwater fluxes. The interannual variability of the AMOC instead is highly correlated among the model experiments and also with observations, including the 2010 minimum observed by ...