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Volume 16, issue 7 | Copyright
Atmos. Chem. Phys., 16, 4641-4659, 2016
https://doi.org/10.5194/acp-16-4641-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 14 Apr 2016

Research article | 14 Apr 2016

Using beryllium-7 to assess cross-tropopause transport in global models

Hongyu Liu1, David B. Considine2,a, Larry W. Horowitz3, James H. Crawford2, Jose M. Rodriguez4, Susan E. Strahan4,5, Megan R. Damon4,6, Stephen D. Steenrod4,5, Xiaojing Xu7, Jules Kouatchou4,6, Claire Carouge8,b, and Robert M. Yantosca8 Hongyu Liu et al.
  • 1National Institute of Aerospace, Hampton, VA, USA
  • 2NASA Langley Research Center, Hampton, VA, USA
  • 3NOAA Geophysical Fluid and Dynamics Laboratory, Princeton, NJ, USA
  • 4NASA Goddard Space Flight Center, Greenbelt, MD, USA
  • 5Universities Space Research Association, Columbia, MD, USA
  • 6Science Systems and Applications, Inc., Lanham, MD, USA
  • 7Science Systems and Applications, Inc., Hampton, VA, USA
  • 8John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
  • anow at: NASA Headquarters, Washington, D.C., USA
  • bnow at: ARC Centre of Excellence for Climate System Science, University of New South Wales, Sydney, Australia

Abstract. We use the Global Modeling Initiative (GMI) modeling framework to assess the utility of cosmogenic beryllium-7 (7Be), a natural aerosol tracer, for evaluating cross-tropopause transport in global models. The GMI chemical transport model (CTM) was used to simulate atmospheric 7Be distributions using four different meteorological data sets (GEOS1-STRAT DAS, GISS II′ GCM, fvGCM, and GEOS4-DAS), featuring significantly different stratosphere–troposphere exchange (STE) characteristics. The simulations were compared with the upper troposphere and/or lower stratosphere (UT/LS) 7Be climatology constructed from  ∼ 25years of aircraft and balloon data, as well as climatological records of surface concentrations and deposition fluxes. Comparison of the fraction of surface air of stratospheric origin estimated from the 7Be simulations with observationally derived estimates indicates excessive cross-tropopause transport at mid-latitudes in simulations using GEOS1-STRAT and at high latitudes using GISS II′ meteorological data. These simulations also overestimate 7Be deposition fluxes at mid-latitudes (GEOS1-STRAT) and at high latitudes (GISS II′), respectively. We show that excessive cross-tropopause transport of 7Be corresponds to overestimated stratospheric contribution to tropospheric ozone. Our perspectives on STE in these meteorological fields based on 7Be simulations are consistent with previous modeling studies of tropospheric ozone using the same meteorological fields. We conclude that the observational constraints for 7Be and observed 7Be total deposition fluxes can be used routinely as a first-order assessment of cross-tropopause transport in global models.

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We assess the utility of cosmogenic beryllium-7, a natural aerosol tracer, for evaluating cross-tropopause transport in global models. We show that model excessive cross-tropopause transport of beryllium-7 corresponds to overestimated stratospheric contribution to tropospheric ozone. We conclude that the observational constraints for beryllium-7 and observed beryllium-7 total deposition fluxes can be used routinely as a first-order assessment of cross-tropopause transport in global models.
We assess the utility of cosmogenic beryllium-7, a natural aerosol tracer, for evaluating...
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