Articles | Volume 21, issue 4
Atmos. Chem. Phys., 21, 2745–2764, 2021
https://doi.org/10.5194/acp-21-2745-2021

Special issue: StratoClim stratospheric and upper tropospheric processes...

Atmos. Chem. Phys., 21, 2745–2764, 2021
https://doi.org/10.5194/acp-21-2745-2021

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 et al.

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.
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