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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/gmd-2019-254
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2019-254
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: development and technical paper 07 Nov 2019

Submitted as: development and technical paper | 07 Nov 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

Enforcing conservation of axial angular momentum in the atmospheric general circulation model CAM6

Thomas Toniazzo1,2, Mats Bentsen1, Cheryl Craig3, Brian Eaton3, James Edwards3, Steven Goldhaber3, Christiane Jablonowski4, and Peter Lauritzen3 Thomas Toniazzo et al.
  • 1NORCE Klima and Bjerknes Centre for Climate Research, Bergen, Norway
  • 2Department of Meteorology (MISU), Stockholm University, Stockholm, Sweden
  • 3National Center for Atmospheric Research, Boulder, Colorado, USA
  • 4University of Michigan, Ann Arbor, Michigan, USA

Abstract. We present a numerical method to enforce global conservation of atmospheric axial angular momentum (AM) in the Community Atmosphere Model (CAM). We discuss the results in a hierarchy of numerical simulations of the atmosphere of increasing complexity, and we demonstrate the importance of global AM conservation in climate simulations.

Thomas Toniazzo et al.
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Short summary
We show that ensuring global conservation of the angular (rotational) momentum (AM) of the atmosphere along the Earth's axis of rotation, which is a property of the governing equations, has important and beneficial consequences for the quality of the numerical simulation of the general circulation of the atmosphere. We discuss the causes of non-conservation in the FV dynamical core of the Community Atmosphere Model (CAM), propose remedies, and show their impact in correcting systematic biases.
We show that ensuring global conservation of the angular (rotational) momentum (AM) of the...
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