Global modeling studies of composition and decadal trends of the Asian Tropopause Aerosol Layer

Bossolasco, Adriana; Jegou, Fabrice; Sellitto, Pasquale; Berthet, Gwenaël; Kloss, Corinna; Legras, Bernard

doi:https://doi.org/10.5194/acp-21-2745-2021

Articles | Volume 21, issue 4

https://doi.org/10.5194/acp-21-2745-2021

© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue:

StratoClim stratospheric and upper tropospheric processes...

https://doi.org/10.5194/acp-21-2745-2021

© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 21, issue 4

Research article

|

24 Feb 2021

Research article |

| 24 Feb 2021

Global modeling studies of composition and decadal trends of the Asian Tropopause Aerosol Layer

Adriana Bossolasco, Fabrice Jegou, Pasquale Sellitto, Gwenaël Berthet, Corinna Kloss, and Bernard Legras

Supplement

https://doi.org/10.5194/acp-21-2745-2021-supplement

Data sets

Modern-Era Retrospective analysis for Research and Applications, Version 2 (MERRA2) NCAR/UCAR and Climate and Global Dynamics Division https://rda.ucar.edu/datasets/ds313.3/

Emissions from CEDS for CMIP6 J.-F. Lamarque and L. K. Emmons https://svn-ccsm-inputdata.cgd.ucar.edu/trunk/inputdata/atm/cam/chem/emis/CMIP6_emissions_1750_2015/

Atmospheric Chemistry Experiment SciSat Level 2 Processed Data, v4.0 P. F. Bernath, J. Steffen, J. Crouse, and C. D. Boone https://doi.org/10.20383/101.0291

Version 4.2x Level 2 and 3 data quality and description document N. J. Livesey, W. G. Read, P. A. Wagner, L. Froidevaux, A. Lambert, G. L. Manney, L. F. Millan Valle, H. C. Pumphrey, M. L. Santee, M. J. Schwartz, S. Wang, R. A. Fuller, R. F. Jarnot, B. W. Knosp, E. Martinez, and R. R. Lay https://mls.jpl.nasa.gov/data/

Model code and software

CESM (The Community Earth System Model) NCAR http://www.cesm.ucar.edu/models/cesm1.2/tags/index.html#CESM1_2_2

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Short summary

Using the Community Earth System Model, we simulate the surface aerosols lifted to the Asian tropopause (the ATAL layer), its composition and trend, covering a long-term period (2000–2015). We identify a double-peak aerosol vertical profile that we attribute to dry and convective cloud-borne aerosols. We find that natural aerosol (mineral dust) is the dominant aerosol type and has no long-term trend. ATAL's anthropogenic fraction, by contrast, shows a marked positive trend.