Publication Abstracts

Huang et al. 2020

Huang, Y., J.F. Kok, K. Kandler, H. Lindqvist, T. Nousiainen, T. Sakai, A. Adebiyi, and O. Jokinen, 2020: Climate models and remote sensing retrievals neglect substantial desert dust asphericity. Geophys. Res. Lett., 47, no. 6, e2019GL086592, doi:10.1029/2019GL086592.

Climate models and remote sensing retrievals generally assume that dust aerosols are spherical or spheroidal. However, measurements show that dust aerosols deviate substantially from spherical and spheroidal shapes, as ratios of particle length to width (the aspect ratio) and height to width (height-to-width ratio) deviate substantially from unity. Here, we quantify dust asphericity by compiling dozens of measurements of aspect ratio and height-to-width ratio across the globe. We find that the length is on average 5 times larger than the height and that climate models and remote sensing retrievals underestimate this asphericity by a factor of ∼3-5. Compiled measurements further suggest that North African dust becomes more aspherical during transport, whereas Asian dust might become less aspherical. We obtain globally-averaged shape distributions, from which we find that accounting for dust asphericity increases gravitational settling lifetime by ∼20%. This increased lifetime helps explain the underestimation of coarse dust transport by models.

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BibTeX Citation

  author={Huang, Y. and Kok, J. F. and Kandler, K. and Lindqvist, H. and Nousiainen, T. and Sakai, T. and Adebiyi, A. and Jokinen, O.},
  title={Climate models and remote sensing retrievals neglect substantial desert dust asphericity},
  journal={Geophys. Res. Lett.},

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RIS Citation

ID  - hu08200c
AU  - Huang, Y.
AU  - Kok, J. F.
AU  - Kandler, K.
AU  - Lindqvist, H.
AU  - Nousiainen, T.
AU  - Sakai, T.
AU  - Adebiyi, A.
AU  - Jokinen, O.
PY  - 2020
TI  - Climate models and remote sensing retrievals neglect substantial desert dust asphericity
JA  - Geophys. Res. Lett.
VL  - 47
IS  - 6
SP  - e2019GL086592
DO  - 10.1029/2019GL086592
ER  -

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