the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
29 Mar 2021
29 Mar 2021
The Brewer-Dobson circulation in CMIP6
- 1Universidad Complutense de Madrid, Madrid, Spain
- 2Deutsches Zentrum für Luft- und Raumfahrt (DLR), Oberpfaffenhofen, Germany
- 3Met Office, Exeter, United Kingdom
- 4NOAA/Geophysical Fluid Dynamics Laboratory, Princeton, NJ, USA
- 5Program in Atmospheric and Oceanic Sciences, Princeton University, Princeton, NJ, USA
- 6Met Office Hadley Centre, Exeter, UK
- 7National Center for Atmospheric Research, Boulder, CO, USA
- 8NASA Goddard Institute for Space Studies, New York, NY, USA
- 9Centre National de Recherches Météorologiques, Toulouse, France
- 10Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama, Japan
- 11Meteorological Research Institute, Tsukuba, Japan
- 1Universidad Complutense de Madrid, Madrid, Spain
- 2Deutsches Zentrum für Luft- und Raumfahrt (DLR), Oberpfaffenhofen, Germany
- 3Met Office, Exeter, United Kingdom
- 4NOAA/Geophysical Fluid Dynamics Laboratory, Princeton, NJ, USA
- 5Program in Atmospheric and Oceanic Sciences, Princeton University, Princeton, NJ, USA
- 6Met Office Hadley Centre, Exeter, UK
- 7National Center for Atmospheric Research, Boulder, CO, USA
- 8NASA Goddard Institute for Space Studies, New York, NY, USA
- 9Centre National de Recherches Météorologiques, Toulouse, France
- 10Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama, Japan
- 11Meteorological Research Institute, Tsukuba, Japan
Abstract. The Brewer-Dobson circulation (BDC) is a key feature of the stratosphere that models need to accurately represent in order to improve the representation of surface climate variability. For the first time, the Climate Model Intercomparison Project includes in its phase 6 (CMIP6) a set of diagnostics that allow for careful evaluation of the BDC. Here, the BDC is evaluated against observations and reanalyses using historical simulations. CMIP6 results confirm the well-known inconsistency in BDC trends between observations and models in the middle and upper stratosphere. The increasing CO2 simulations feature a robust acceleration of the BDC but also reveal large uncertainties in the deep branch trends. The very close connection between the shallow branch and surface temperature is highlighted, which is absent in the deep branch. The trends in mean age of air are shown to be more robust throughout the stratosphere than those in the residual circulation. The paper reflects the current knowledge and main uncertainties regarding the BDC.
Marta Abalos et al.
Status: open (until 24 May 2021)
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CC1: 'Comment on acp-2021-206', Simon Chabrillat, 30 Mar 2021
reply
Thanks for this important paper. Figure 3 shows several estimations of Age of Air at 50hPa, including one derived from N2O observations through the GOZCARDS dataset. I would like to know more about this AoA estimation, but the corresponding reference (Linz et al., 2016) does not mention GOZCARDS nor does it show any such latitudinal distribution of AoA. Do you have a better reference for this?
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CC2: 'Comment on acp-2021-206', Petr Šácha, 30 Mar 2021
reply
The comment is uploaded in the .pdf format in the Supplement.
Marta Abalos et al.
Marta Abalos et al.
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