View : 17 Download: 0

Observational diagnosis of cloud phase in the winter Antarctic atmosphere for parameterizations in climate models

Title
Observational diagnosis of cloud phase in the winter Antarctic atmosphere for parameterizations in climate models
Authors
Choi Y.-S.Ho C.-H.Kim S.-W.Lindzen R.S.
Ewha Authors
최용상
SCOPUS Author ID
최용상scopus
Issue Date
2010
Journal Title
Advances in Atmospheric Sciences
ISSN
0256-1530JCR Link
Citation
vol. 27, no. 6, pp. 1233 - 1245
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
The cloud phase composition of cold clouds in the Antarctic atmosphere is explored using data from the Moderate Resolution Imaging Spectroradiometer (MODIS) and Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) instruments for the period 2000-2006. We used the averaged fraction of liquid-phase clouds out of the total cloud amount at the cloud tops since the value is comparable in the two measurements. MODIS data for the winter months (June, July, and August) reveal liquid cloud fraction out of the total cloud amount significantly decreases with decreasing cloud-top temperature below 0°C. In addition, the CALIOP vertical profiles show that below the ice clouds, low-lying liquid clouds are distributed over ∼20% of the area. With increasing latitude, the liquid cloud fraction decreases as a function of the local temperature. The MODIS-observed relation between the cloud-top liquid fraction and cloud-top temperature is then applied to evaluate the cloud phase parameterization in climate models, in which condensed cloud water is repartitioned between liquid water and ice on the basis of the grid point temperature. It is found that models assuming overly high cut-offs (≫ -40°C) for the separation of ice clouds from mixed-phase clouds may significantly underestimate the liquid cloud fraction in the winter Antarctic atmosphere. Correction of the bias in the liquid cloud fraction would serve to reduce the large uncertainty in cloud radiative effects. © 2010 Chinese National Committee for International Association of Meteorology and Atmospheric Sciences, Institute of Atmospheric Physics, Science Press and Springer-Verlag Berlin Heidelberg.
DOI
10.1007/s00376-010-9175-3
Appears in Collections:
엘텍공과대학 > 환경공학전공 > Journal papers
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE