ICE microphysical properties and their relation to dissipation process observed by ship-borne cloud radar

Research output: Contribution to conferencePaper

Abstract

We compared the microphysical properties retrieved by cloud profiling radar with those simulated by GCM, SPRINTARS, along the Mirai cruise tracks in Tropics, Mid-latitude and the Arctic. Prior to the detailed comparison of microphysics, the cloud patterns in GCMs were tested against observations and in general, good agreement was achieved. The comparison was focused on the IWCs (IWCGM and IWCIN), reff and their inter-relationship. Common features in the model's reff and IWCs were the narrow dispersion and large peak value in their frequency distribution. For comparison in the mean vertical profiles of the microphysics, over/under estimation were found in the model's reff at high (above 8 km)/low (from 6 km to 8 km) altitudes despite the latitude. Notable difference among latitudes are 1) the over-/under prediction of IWCIN in model at 6<R<8 km in the Tropics and Mid-latitude/the Arctic, and 2) The differences in the dominant contributor (s) (Cfice or/and IWC IN) in the predicted IWCGM. These results may indicate the latitudinal dependence in the applicability of the cloud schemes used in GCM. The dissipation rates of ice clouds are estimated by the vertical distribution of Vair, Vt and IWCIN obtained by the radar. It is shown that the mass fluxes are positive on average in the upper troposphere despite the region, while they become negative and large in magnitude as the altitude decreases. Such sedimentation rate, especially at 6<R<8 km, is the smallest in the Arctic and largest for the Tropics, and may account for the difference seen in the model validation results for IWCIN among the latitudes. Further validation of the retrieved Vair and microphysics by simultaneous measurements will be provided, and investigation on the relation of the horizontal structure of clouds, cloud microphysics and Vair will be reported during the conference. Then the importance of Vair and Vt at various scales will be addressed in relation to the discrepancies between the observed and simulated microphysics and their effects on the estimation in cloud radiative properties and duration in the model.

Original languageEnglish
Publication statusPublished - 2006
Event12th Conference on Cloud Physics and 12th Conference on Atmospheric Radiation - Madison, WI, United States
Duration: Jul 10 2006Jul 14 2006

Other

Other12th Conference on Cloud Physics and 12th Conference on Atmospheric Radiation
CountryUnited States
CityMadison, WI
Period7/10/067/14/06

All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications
  • Environmental Chemistry
  • Environmental Engineering
  • Global and Planetary Change

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    Sato, K., Okamoto, H., & Takemura, T. (2006). ICE microphysical properties and their relation to dissipation process observed by ship-borne cloud radar. Paper presented at 12th Conference on Cloud Physics and 12th Conference on Atmospheric Radiation, Madison, WI, United States.