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Assessing the Radiative Effects of Global Ice Clouds Based on CloudSat and CALIPSO Measurements

Title: Assessing the Radiative Effects of Global Ice Clouds Based on CloudSat and CALIPSO Measurements.
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Name(s): Hong, Yulan, author
Liu, Guosheng, author
Li, J.-L. F., author
Type of Resource: text
Genre: Text
Date Issued: 2016-11
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: Although it is well established that cirrus warms Earth, the radiative effect of the entire spectrum of ice clouds is not well understood. In this study, the role of all ice clouds in Earth's radiation budget is investigated by performing radiative transfer modeling using ice cloud properties retrieved from CloudSat and CALIPSO measurements as inputs. Results show that, for the 2008 period, the warming effect (similar to 21.8 +/- 5.4 W m(-2)) induced by ice clouds trapping longwave radiation exceeds their cooling effect (similar to-16.7 +/- 1.7 W m(-2)) caused by shortwave reflection, resulting in a net warming effect (similar to 5.1 +/- 3.8 W m(-2)) globally on the earthatmosphere system. The net warming is over 15 W m(-2) in the tropical deep convective regions, whereas cooling occurs in the midlatitudes, which is less than 10 W m(-2) in magnitude. Seasonal variations of ice cloud radiative effects are evident in the midlatitudes where the net effect changes from warming during winter to cooling during summer, whereas warming occurs all year-round in the tropics. Ice cloud optical depth t is shown to be an important factor in determining the sign and magnitude of the net radiative effect. Ice clouds with tau < 4.6 display a warming effect with the largest contributions from those with tau approximate to 1.0. In addition, ice clouds cause vertically differential heating and cooling of the atmosphere, particularly with strong heating in the upper troposphere over the tropics. At Earth's surface, ice clouds produce a cooling effect no matter how small the tau value is.
Identifier: FSU_libsubv1_wos_000386205900006 (IID), 10.1175/JCLI-D-15-0799.1 (DOI)
Keywords: cirrus clouds, climate, lidar, optical-properties, parameterization, products, retrieval, Scattering, software package, water-content
Publication Note: The publisher’s version of record is available at http://www.dx.doi.org/10.1175/JCLI-D-15-0799.1
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000386205900006
Host Institution: FSU
Is Part Of: Journal of Climate.
0894-8755
Issue: iss. 21, vol. 29

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Hong, Y., Liu, G., & Li, J. -L. F. (2016). Assessing the Radiative Effects of Global Ice Clouds Based on CloudSat and CALIPSO Measurements. Journal Of Climate. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000386205900006