Evaluating the Model Representation of Asian Summer Monsoon Upper Troposphere and Lower Stratosphere Transport and Composition Using Airborne In Situ Observations

Smith, Warren P.; Pan, Laura L.; Kinnison, Douglas; Atlas, Elliot; Honomichl, Shawn; Zhang, Jun; Tilmes, Simone; Fernandez, Rafael P.; Saiz‐Lopez, Alfonso; Treadaway, Victoria; Adcock, Karina E.; Laube, Johannes C.; von Hobe, Marc; Kloss, Corinna; Viciani, Silvia; D’Amato, Francesco; Volk, C. Michael; Ravegnani, Fabrizio

doi:10.1029/2023jd039756

i

Evaluating the Model Representation of Asian Summer Monsoon Upper Troposphere and Lower Stratosphere Transport and Composition Using Airborne In Situ Observations

2024
By Smith, Warren P. ; Pan, Laura L. ; Kinnison, Douglas ; ...

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Journal Title:

Journal of Geophysical Research: Atmospheres
Personal Author:

Smith, Warren P. ; Pan, Laura L. ; Kinnison, Douglas ; Atlas, Elliot ; Honomichl, Shawn ; Zhang, Jun ; Tilmes, Simone ; Fernandez, Rafael P. ; Saiz‐Lopez, Alfonso ; Treadaway, Victoria ; Adcock, Karina E. ; Laube, Johannes C. ; von Hobe, Marc ; Kloss, Corinna ; Viciani, Silvia ; D’Amato, Francesco ; Volk, C. Michael ; Ravegnani, Fabrizio
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; CIRES (Cooperative Institute for Research in Environmental Sciences) ; CSL (Chemical Sciences Laboratory)
Description:

Chemistry Climate Models (CCMs) 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 chemical composition and transport by CCMs. Process‐based diagnostics using dynamical and chemical coordinates are presented which minimize the spatial and temporal sampling differences between airborne in situ measurements and CCM grid points. The chosen process is the chemical impact of the Asian summer monsoon (ASM), where deep convection serves as a rapid transport pathway for surface emissions to reach the upper troposphere and lower stratosphere (UTLS). We examine two CCM configurations for their representation of the ASM UTLS using a set of airborne observations from south Asia. The diagnostics reveal good model performance at representing tropospheric tracer distribution throughout the troposphere and lower stratosphere, and excellent representation of chemical aging in the lower stratosphere when chemical loss is dominated by photolysis. Identified model limitations include the use of zonally averaged mole fraction boundary conditions for species with sufficiently short tropospheric lifetimes, which may obscure enhanced regional emissions sources. Overall, the diagnostics underscore the skill of current‐generation models at representing pollution transport from the boundary layer to the stratosphere via the ASM mechanism, and demonstrate the strength of airborne in situ observations toward characterizing this representation.
Source:

Journal of Geophysical Research: Atmospheres, 129(4)
DOI:

https://doi.org/10.1029/2023jd039756
ISSN:

2169-897X ; 2169-8996
Format:

pdf
Publisher:

American Geophysical Union (AGU)
Document Type:

Journal Article
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urn:sha-512:0e799cf6e999d116f8549cc480471ec6f862c3700b016318d498fae29a560ca8f514cce0405b5f39410768cef30b64862d16e841241409a2aa2255bd0107a88e
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https://repository.library.noaa.gov/view/noaa/68636/noaa_68636_DS1.pdf
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