Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

IF value: 5.414
IF5.414
IF 5-year value: 5.958
IF 5-year
5.958
CiteScore value: 9.7
CiteScore
9.7
SNIP value: 1.517
SNIP1.517
IPP value: 5.61
IPP5.61
SJR value: 2.601
SJR2.601
Scimago H <br class='widget-line-break'>index value: 191
Scimago H
index
191
h5-index value: 89
h5-index89
Volume 12, issue 23
Atmos. Chem. Phys., 12, 11319–11327, 2012
https://doi.org/10.5194/acp-12-11319-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Chem. Phys., 12, 11319–11327, 2012
https://doi.org/10.5194/acp-12-11319-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 03 Dec 2012

Research article | 03 Dec 2012

Vertical transport of pollutants by shallow cumuli from large eddy simulations

G. Chen1, H. Xue1, G. Feingold2, and X. Zhou1,3 G. Chen et al.
  • 1Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, 100871, China
  • 2NOAA Earth System Research Laboratory, Boulder, CO 80305, USA
  • 3Chinese Academy of Meteorological Sciences, Beijing, 100081, China

Abstract. This study investigates the vertical transport of a passive tracer in a shallow cumulus boundary layer using large eddy simulations. The tracer source is at the surface in one case, and in the inversion layer in the other case. Results show that shallow cumulus clouds can significantly enhance vertical transport of the tracer in both cases. In the case with surface-borne pollutants, cloudy regions are responsible for the upward transport, due to the intense updrafts in cumulus clouds. In the case where pollutants are aloft, cloud-free regions are responsible for the downward transport, but the downward transport mainly occurs in thin regions around cloud edges. This is consistent with previous aircraft measurements of downdrafts around cumulus clouds and indicates that the downward transport is also cloud-induced. Cumulus convection is therefore able to both vent pollutants upward from the surface and fumigate pollutants in the inversion layer downward into the lower boundary layer.

Publications Copernicus
Download
Citation
Altmetrics
Final-revised paper
Preprint