Preprints
https://doi.org/10.5194/acpd-8-20399-2008
https://doi.org/10.5194/acpd-8-20399-2008
08 Dec 2008
 | 08 Dec 2008
Status: this preprint was under review for the journal ACP. A revision for further review has not been submitted.

Effects of model resolution on entrainment (inversion heights), cloud-radiation interactions, and cloud radiative forcing

H. Guo, Y. Liu, P. H. Daum, X. Zeng, X. Li, and W.-K. Tao

Abstract. We undertook three-dimensional numerical studies of a marine stratus deck under a strong inversion using an interactive shortwave- and longwave-radiation module. A suite of sensitivity tests were conducted to address the effects of model resolution on entrainment (inversion heights), cloud-radiation interactions, and cloud radiative-forcings by varying model horizontal resolution only, varying vertical resolution only, and varying horizontal- and vertical-resolution simultaneously but with a fixed aspect ratio of 2.5.

Our results showed that entrainment (inversion height) is more sensitive to vertical- than to horizontal-resolution. A vertical resolution finer than 40 m can simulate spatial- and temporal-variations in the inversion height well. The inversion height decreases with increasing vertical resolution, but tends to increase with increasing horizontal resolution. Cloud liquid water path doubles after refining both the vertical- and horizontal-resolution by a factor of four. This doubling is associated with a positive feedback between cloud water and cloud top radiative cooling, which amplifies small differences initiated by changes in the model resolution. The magnitude of the cloud radiative-forcing tends to increase with increasing model resolution, mainly attributable to the increase in the cloud liquid water path. Shortwave radiative forcing is dominant, and more sensitive to model resolution than the longwave counterpart.

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H. Guo, Y. Liu, P. H. Daum, X. Zeng, X. Li, and W.-K. Tao
 
Status: closed (peer review stopped)
Status: closed (peer review stopped)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Status: closed (peer review stopped)
Status: closed (peer review stopped)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
H. Guo, Y. Liu, P. H. Daum, X. Zeng, X. Li, and W.-K. Tao
H. Guo, Y. Liu, P. H. Daum, X. Zeng, X. Li, and W.-K. Tao

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