Publication Abstracts

Kok et al. 2021

Kok, J.F., A.A. Adebiyi, S. Albani, Y. Balkanski, R. Checa-Garcia, M. Chin, P.R. Colarco, D.S. Hamilton, Y. Huang, A. Ito, M. Klose, D.M. Leung, L. Li, N.M. Mahowald, R.L. Miller, V. Obiso, C. Pérez García-Pando, A. Rocha-Lima, J.S. Wan, and C.A. Whicker, 2021: Improved representation of the global dust cycle using observational constraints on dust properties and abundance. Atmos. Chem. Phys., 21, no. 10, 8127-8167, doi:10.5194/acp-21-8127-2021.

Even though desert dust is the most abundant aerosol by mass in Earth's atmosphere, atmospheric models struggle to accurately represent its spatial and temporal distribution. These model errors are partially caused by fundamental difficulties in simulating dust emission in coarse-resolution models and in accurately representing dust microphysical properties. Here we mitigate these problems by developing a new methodology that yields an improved representation of the global dust cycle. We present an analytical framework that uses inverse modeling to integrate an ensemble of global model simulations with observational constraints on the dust size distribution, extinction efficiency, and regional dust aerosol optical depth. We then compare the inverse model results against independent measurements of dust surface concentration and deposition flux and find that errors are reduced by approximately a factor of 2 relative to current model simulations of the Northern Hemisphere dust cycle. The inverse model results show smaller improvements in the less dusty Southern Hemisphere, most likely because both the model simulations and the observational constraints used in the inverse model are less accurate. On a global basis, we find that the emission flux of dust with a geometric diameter up to 20 µm (PM20) is approximately 5000 Tg/yr, which is greater than most models account for. This larger PM20 dust flux is needed to match observational constraints showing a large atmospheric loading of coarse dust. We obtain gridded datasets of dust emission, vertically integrated loading, dust aerosol optical depth, (surface) concentration, and wet and dry deposition fluxes that are resolved by season and particle size. As our results indicate that this dataset is more accurate than current model simulations and the MERRA-2 dust reanalysis product, it can be used to improve quantifications of dust impacts on the Earth system.

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BibTeX Citation

@article{ko04600m,
  author={Kok, J. F. and Adebiyi, A. A. and Albani, S. and Balkanski, Y. and Checa-Garcia, R. and Chin, M. and Colarco, P. R. and Hamilton, D. S. and Huang, Y. and Ito, A. and Klose, M. and Leung, D. M. and Li, L. and Mahowald, N. M. and Miller, R. L. and Obiso, V. and Pérez García-Pando, C. and Rocha-Lima, A. and Wan, J. S. and Whicker, C. A.},
  title={Improved representation of the global dust cycle using observational constraints on dust properties and abundance},
  year={2021},
  journal={Atmos. Chem. Phys.},
  volume={21},
  number={10},
  pages={8127--8167},
  doi={10.5194/acp-21-8127-2021},
}

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RIS Citation

TY  - JOUR
ID  - ko04600m
AU  - Kok, J. F.
AU  - Adebiyi, A. A.
AU  - Albani, S.
AU  - Balkanski, Y.
AU  - Checa-Garcia, R.
AU  - Chin, M.
AU  - Colarco, P. R.
AU  - Hamilton, D. S.
AU  - Huang, Y.
AU  - Ito, A.
AU  - Klose, M.
AU  - Leung, D. M.
AU  - Li, L.
AU  - Mahowald, N. M.
AU  - Miller, R. L.
AU  - Obiso, V.
AU  - Pérez García-Pando, C.
AU  - Rocha-Lima, A.
AU  - Wan, J. S.
AU  - Whicker, C. A.
PY  - 2021
TI  - Improved representation of the global dust cycle using observational constraints on dust properties and abundance
JA  - Atmos. Chem. Phys.
VL  - 21
IS  - 10
SP  - 8127
EP  - 8167
DO  - 10.5194/acp-21-8127-2021
ER  -

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