Parameterizations of the microphysical and shortwave radiative properties of boundary layer stratus from ground-based measurements

Xiquan Dong, Thomas P. Ackerman, Eugene E. Clothiaux

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

In earlier work a δ2-stream radiative transfer model was used in conjunction with ground-based measurements to retrieve the microphysical and shortwave radiative properties of boundary layer stratus. The effective radii output by the retrieval scheme for optically thick clouds have now been parameterized as a function of the cloud liquid water path, the transmission ratio, and the cosine of the solar zenith angle. The parameterization enables estimation of stratus cloud microphysical properties using ground-based measurements that are readily available at a number of locations. To validate the retrieved and parameterized cloud microphysics, ∼5 hours of data were analyzed and compared to collocated in situ measurements made by a Forward Scattering Spectrometer Probe. On average, the retrieved values of the cloud droplet effective radius and the cloud droplet number concentration differed from the corresponding aircraft measurements by 7% and 27%, respectively, while the parameterized values differed from the aircraft measurements by 15% and 32%, respectively. Averaging all of the data to 30-min resolution significantly reduced the differences between the aircraft data and the retrieved and parameterized results, suggesting that both the aircraft and the ground-based data are capable of characterizing the cloud microphysics over this temporal scale. The parameterizations of the stratus shortwave radiative properties were generally within 5% of Slingo's four-band, model-derived parameterization when absorption above cloud top was incorporated into the Slingo parameterization.

Original languageEnglish (US)
Article number1998JD200047
Pages (from-to)31681-31693
Number of pages13
JournalJournal of Geophysical Research Atmospheres
Volume103
Issue numberD24
DOIs
StatePublished - Jan 1 1998

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stratus
ground-based measurement
Parameterization
parameterization
aircraft
boundary layers
Boundary layers
boundary layer
cloud microphysics
Aircraft
airborne survey
cloud droplet
droplets
zenith angle
Forward scattering
in situ measurement
stratus clouds
Radiative transfer
radiative transfer
spectrometers

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences (miscellaneous)
  • Palaeontology

Cite this

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abstract = "In earlier work a δ2-stream radiative transfer model was used in conjunction with ground-based measurements to retrieve the microphysical and shortwave radiative properties of boundary layer stratus. The effective radii output by the retrieval scheme for optically thick clouds have now been parameterized as a function of the cloud liquid water path, the transmission ratio, and the cosine of the solar zenith angle. The parameterization enables estimation of stratus cloud microphysical properties using ground-based measurements that are readily available at a number of locations. To validate the retrieved and parameterized cloud microphysics, ∼5 hours of data were analyzed and compared to collocated in situ measurements made by a Forward Scattering Spectrometer Probe. On average, the retrieved values of the cloud droplet effective radius and the cloud droplet number concentration differed from the corresponding aircraft measurements by 7{\%} and 27{\%}, respectively, while the parameterized values differed from the aircraft measurements by 15{\%} and 32{\%}, respectively. Averaging all of the data to 30-min resolution significantly reduced the differences between the aircraft data and the retrieved and parameterized results, suggesting that both the aircraft and the ground-based data are capable of characterizing the cloud microphysics over this temporal scale. The parameterizations of the stratus shortwave radiative properties were generally within 5{\%} of Slingo's four-band, model-derived parameterization when absorption above cloud top was incorporated into the Slingo parameterization.",
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Parameterizations of the microphysical and shortwave radiative properties of boundary layer stratus from ground-based measurements. / Dong, Xiquan; Ackerman, Thomas P.; Clothiaux, Eugene E.

In: Journal of Geophysical Research Atmospheres, Vol. 103, No. D24, 1998JD200047, 01.01.1998, p. 31681-31693.

Research output: Contribution to journalArticle

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