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Assessing stratospheric transport in the CMAM30 simulations using ACE-FTS measurements
  • Published Date:
    2018
  • Source:
    Atmospheric Chemistry and Physics, 18(9), 6801-6828.
Filetype[PDF-4.42 MB]


Details:
  • Personal Author:
  • Description:
    Stratospheric transport in global circulation models and chemistry-climate models is an important component in simulating the recovery of the ozone layer as well as changes in the climate system. The Brewer-Dobson circulation is not well constrained by observations and further investigation is required to resolve uncertainties related to the mechanisms driving the circulation. This study has assessed the specified dynamics mode of the Canadian Middle Atmosphere Model (CMAM30) by comparing to the Atmospheric Chemistry Experiment Fourier transform spectrometer (ACE-FTS) profile measurements of CFC-11 (CCl3F), CFC-12 (CCl2F2), and N2O. In the CMAM30 specified dynamics simulation, the meteorological fields are nudged using the ERA-Interim reanalysis and a specified tracer was employed for each species, with hemispherically defined surface measurements used as the boundary condition. A comprehensive sampling technique along the line of sight of the ACE-FTS measurements has been utilized to allow for direct comparisons between the simulated and measured tracer concentrations. The model consistently overpredicts tracer concentrations of CFC-11, CFC-12, and N2O in the lower stratosphere, particularly in the northern hemispheric winter and spring seasons. The three mixing barriers investigated, including the polar vortex, the extratropical tropopause, and the tropical pipe, show that there are significant inconsistencies between the measurements and the simulations. In particular, the CMAM30 simulation underpredicts mixing efficiency in the tropical lower stratosphere during the June-July-August season.
  • DOI:
    http://dx.doi.org/10.5194/acp-18-6801-2018
  • Document Type:
    Journal Article
  • Collection(s):
    NOAA Cooperative Institutes
    Office of Oceanic and Atmospheric Research (OAR)
  • Main Document Checksum:
  • Supporting Files:
    No Additional Files
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      Wells, K. C.; Millet, D. B.; Bousserez, N.; Henze, D. K.; Griffis, T. J.; Chaliyakunnel, S.; Dlugokencky, E. J.; Saikawa, E.; Xiang, G.; Prinn, R. G.; O'Doherty, S.; Young, D.; Weiss, R. F.; Dutton, G. S.; Elkins, J. W.; Krummel, P. B.; Langenfelds, R.; Steele, L. P.;
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      2018
      Source:
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      Description:
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      Raczka, B.; Biraud, S. C.; Ehleringer, J. R.; Lai, C. T.; Miller, J. B.; Pataki, D. E.; Saleska, S. R.; Torn, M. S.; Vaughn, B. H.; Wehr, R.; Bowling, D. R.;
      Published Date:
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      Source:
      Journal of Geophysical Research-Biogeosciences, 122(8), 1969-1987.
      Description:
      The seasonal pattern of the carbon isotope content (delta C-13) of atmospheric CO2 depends on local and nonlocal land-atmosphere exchange and atmospheric transport. Previous studies suggested that the delta C-13 of the net land-atmosphere CO2 flux (d...
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      Dieng, D.; Laux, P.; Smiatek, G.; Heinzeller, D.; Bliefernicht, J.; Sarr, A.; Gaye, A. T.; Kunstmann, H.;
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      2018
      Source:
      Journal of Geophysical Research-Atmospheres, 123(15), 7950-7973.
      Description:
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      Published Date:
      2018
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      Journal of Geophysical Research-Atmospheres, 123(17), 9813-9827.
      Description:
      Although urban NOx lifetimes have been examined extensively during summertime conditions, wintertime NOx chemistry has been comparatively less studied. We use measurements of NOx and its oxidation products from the aircraft-based WINTER (Wintertime I...
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      Personal Author:
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      Published Date:
      2016
      Source:
      Atmospheric Chemistry and Physics, 16(7), 4423-4438.
      Description:
      Under certain conditions, secondary organic aerosol (SOA) particles can exist in the atmosphere in an amorphous solid or semi-solid state. To determine their relevance to processes such as ice nucleation or chemistry occurring within particles requir...
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      Personal Author:
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      Source:
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      Description:
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      Published Date:
      2016
      Source:
      Journal of Geophysical Research-Atmospheres, 121(12), 7430-7460.
      Description:
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      Janssens-Maenhout, G.; Crippa, M.; Guizzardi, D.; Dentener, F.; Muntean, M.; Pouliot, G.; Keating, T.; Zhang, Q.; Kurokawa, J.; Wankmuller, R.; van der Gon, H. D.; Kuenen, J. J. P.; Klimont, Z.; Frost, G.; Darras, S.; Koffi, B.; Li, M.;
      Published Date:
      2015
      Source:
      Atmospheric Chemistry and Physics, 15(19), 11411-11432.
      Description:
      The mandate of the Task Force Hemispheric Transport of Air Pollution (TF HTAP) under the Convention on Long-Range Transboundary Air Pollution (CLRTAP) is to improve the scientific understanding of the intercontinental air pollution transport, to quan...
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      Brown, S. S.; Dube, W. P.; Tham, Y. J.; Zha, Q. Z.; Xue, L. K.; Poon, S.; Wang, Z.; Blake, D. R.; Tsui, W.; Parrish, D. D.; Wang, T.;
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      2016
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      Journal of Geophysical Research-Atmospheres, 121(5), 2457-2475.
      Description:
      Nighttime reactions of nitrogen oxides influence ozone, volatile organic compounds, and aerosol and are thus important to the understanding of regional air quality. Despite large emissions and rapid recent growth of nitrogen oxide concentrations, the...
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      Published Date:
      2018
      Source:
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      Description:
      Soil moisture retention (SMR) capacity plays a key role in estimating the direct runoff when a multi-pulse storm event occurs. It is very important to know how much SMR will be recovered during the intervals of no rain of a multi-pulse storm. This st...
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      Personal Author:
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      Description:
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      Dimdore-Miles, O. B.; Palmer, P. I.; Bruhwiler, L. P.;
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      2018
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      Atmospheric Chemistry and Physics, 18(24), 17895-17907.
      Description:
      We consider the utility of the annual inter-polar difference (IPD) as a metric for changes in Arctic emissions of methane (CH4). The IPD has been previously defined as the difference between weighted annual means of CH4 mole fraction data collected a...
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      Byju, P.; Dommenget, D.; Alexander, M. A.;
      Published Date:
      2018
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      Geophysical Research Letters, 45(15), 7683-7691.
      Description:
      Sea surface temperature anomalies (SSTA) in portions of the extratropics are known to recur from one winter to the next without persisting through the intervening summer. Previous studies identified only a limited number of midlatitude regions where ...
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      Personal Author:
      Richardson, K.; Asmutis-Silvia, R.; Drinkwin, J.; Gilardi, K. V. K.; Giskes, I.; Jones, G.; O'Brien, K.; Pragnell-Raasch, H.; Ludwig, L.; Antonelis, K.; Barco, S.; Henry, A.; Knowlton, A.; Landry, S.; Mattila, D.; MacDonald, K.; Moore, M.; Morgan, J.; Robbins, J.; van der Hoop, J.; Hogan, E.;
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      Marine Pollution Bulletin, 138, 222-229.
      Description:
      Abandoned, lost or discarded fishing gear (ALDFG) comprises a significant amount of global marine debris, with diverse impacts to marine environments, wildlife, and the fishing industry. Building evidence on ALDFG is critical to holistically understa...
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      High-resolution measurements of the air-ice-ocean system during an October 2015 event in the Beaufort Sea demonstrate how stored ocean heat can be released to temporarily reverse seasonal ice advance. Strong on-ice winds over a vast fetch caused mixi...
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      2016
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      Journal of Geophysical Research-Atmospheres, 121(11), 6336-6355.
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