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Evaluating the Model Representation of Asian Summer Monsoon UTLS Transport and Composition using Airborne In Situ Observations
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  • Warren P Smith,
  • Laura L Pan,
  • Douglas Edward Kinnison,
  • Elliot L. Atlas,
  • Shawn Honomichl,
  • Jun Zhang,
  • Simone Tilmes,
  • Rafael Pedro Fernandez,
  • Alfonso Saiz-Lopez,
  • Victoria Treadaway,
  • Karina E Adcock,
  • Johannes C. Laube,
  • M. von Hobe,
  • Corinna Kloss,
  • Silvia Viciani,
  • Francesco D'Amato,
  • C. Michael Volk,
  • Fabrizio Ravegnani
Warren P Smith

Corresponding Author:wsmith@ucar.edu

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Laura L Pan
National Center for Atmospheric Research (NCAR)
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Douglas Edward Kinnison
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Elliot L. Atlas
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Shawn Honomichl
National Center for Atmospheric Research
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Jun Zhang
National Center for Atmospheric Research
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Simone Tilmes
National Center for Atmospheric Research (UCAR)
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Rafael Pedro Fernandez
National Research Council (CONICET)
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Alfonso Saiz-Lopez
Spanish National Research Council (CSIC)
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Victoria Treadaway
Cooperative Institute for Research in Environmental Sciences
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Karina E Adcock
University of East Anglia
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Johannes C. Laube
Forschungszentrum Juelich GmbH
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M. von Hobe
Forschungszentrum Juelich
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Corinna Kloss
Forschungszentrum Juelich
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Silvia Viciani
CNR-INO National Institute of Optics
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Francesco D'Amato
CNR - Istituto Nazionale di Ottica
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C. Michael Volk
University of Wuppertal
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Fabrizio Ravegnani
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Chemistry transport models (CTMs) are essential tools for characterizing and predicting the role of atmospheric composition and chemistry in Earth’s climate system. This study demonstrates the use of airborne in situ observations to diagnose the representation of atmospheric composition by global CTMs. Process-based diagnostics are developed which minimize the spatial and temporal sampling differences between airborne in situ measurements and CTM grid points. The developed diagnostics make use of dynamical and chemical vertical coordinates as a means of highlighting areas where focused model improvement is needed. The chosen process is the chemical impact of the Asian summer monsoon (ASM), where deep convection serves a unique pathway for rapid transport of surface emissions and pollutants to the stratosphere. Two global CTM configurations are examined for their representation of the ASM upper troposphere and lower stratosphere (UTLS), using airborne observations collected over south Asia. Application of the developed diagnostics to the CTMs reveals the limitations of zonally-averaged surface boundary conditions for species with sufficiently short tropospheric lifetimes, and that species whose stratospheric loss rates are dominated by photolysis have excellent agreement compared to that observed. Overall, the diagnostics demonstrate the strength of airborne observations toward improving model predictions, and highlight the utility of highly-resolved CTMs to improve the understanding of reactive transport of anthropogenic pollutants to the stratosphere.
03 Aug 2023Submitted to ESS Open Archive
04 Aug 2023Published in ESS Open Archive