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Discussion papers
https://doi.org/10.5194/acp-2018-972
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2018-972
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 23 Oct 2018

Research article | 23 Oct 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

The global overturning diabatic circulation of the stratosphere as a metric for the Brewer-Dobson Circulation

Marianna Linz1, Marta Abalos2, Anne Sasha Glanville3, Douglas E. Kinnison3, Alison Ming4, and Jessica Neu5 Marianna Linz et al.
  • 1Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, 520 Portola Plaza Los Angeles, CA 90095, USA
  • 2Department of Earth Physics and Astrophysics, Universidad Complutense de Madrid, Madrid, Spain
  • 3Atmospheric Chemistry Observations and Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, USA
  • 4British Antarctic Survey, Cambridge, CB3 0ET, UK
  • 5Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr, Pasadena, CA, 91109 USA

Abstract. The circulation of the stratosphere, also known as the Brewer-Dobson circulation, transports water vapor and ozone, with implications for radiative forcing and climate. This circulation is typically quantified from model output by calculating the tropical upwelling vertical velocity in the residual circulation framework, and it is estimated from observations by using time series of tropical water vapor to infer a vertical velocity. Recent theory has introduced a method to calculate the global mean diabatic circulation strength through isentropes from satellite measurements of long-lived tracers. In this paper, we explore this global diabatic circulation as it relates to the residual circulation vertical velocity, stratospheric water vapor, and ozone at interannual timescales. We use a comprehensive climate model, three reanalysis data products, and satellite ozone data. The different metrics for the circulation have different properties, especially with regards to the vertical autocorrelation. In the model, the different residual circulation metrics agree closely and are well correlated with the global diabatic circulation, except in the lowermost stratosphere. In the reanalysis products however, there are more differences throughout, indicating the dynamical inconsistencies of these products. The vertical velocity derived from the time series of water vapor in the tropics is significantly correlated with the diabatic circulation, but this relationship is not as strong as that between the diabatic circulation and the residual circulation vertical velocity. We find that the diabatic circulation in the lower to middle stratosphere (up to 500K) is correlated with the total column ozone in the high latitudes and in the tropics. The upper level circulation is also correlated with the total column ozone, primarily in the subtropics, and we show that this is due to the correlation of both the circulation and the ozone with upper level temperatures.

Marianna Linz et al.
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