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Study of the Probability of Clear Line of Sight Through Single-Layer Cumulus Cloud Fields in the Tropical Western Pacific

Title: A Study of the Probability of Clear Line of Sight Through Single-Layer Cumulus Cloud Fields in the Tropical Western Pacific.
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Name(s): Taylor, Patrick C., author
Liu, Guosheng, professor co-directing thesis
Takara, Ezra, professor co-directing thesis
Zou, Xiaolei, committee member
Ruscher, Paul, committee member
Department of Earth, Ocean and Atmospheric Sciences, degree granting department
Florida State University, degree granting institution
Type of Resource: text
Genre: Text
Issuance: monographic
Date Issued: 2006
Publisher: Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: The plane-parallel hypothesis (PPH) used to approximate clouds in global climate models neglects the 3-D effects of clouds. Such effects can contribute as much as 20 Wm-2 to the downward longwave flux at the surface. Several investigators have proposed accounting for longwave 3-D cloud effects by using information on the Probability of Clear Line of Sight (PCLoS) to modify the PPH approximation. This study investigates the PCLoS at the Atmosphere Radiation Measurement (ARM) Program's Tropical Western Pacific (TWP) site and its dependence on cloud properties. PCLoS is determined for single-layer cumulus events over 2-hour intervals using Whole Sky Imager (WSI) data at the Nauru and Manus sites simultaneous to numerous observations of the location of cloud boundaries and the downward longwave flux. The WSI PCLoS is compared to calculations from a set of PCLoS models using measured cloud field statistics as input (e.g., cloud fraction and aspect ratio). A PCLoS climatology is also prepared for the observation periods at both sites, and the results are used to investigate the spatial variability of the PCLoS and effects on the downward longwave flux at the surface. Comparisons to similar data obtained at the ARM Southern Great Plains site will also be made.
Identifier: FSU_migr_etd-1659 (IID)
Submitted Note: A Thesis Submitted to the Department of Meteorology in Partial Fulfillment of the Requirements for the Degree of Master of Science.
Degree Awarded: Summer Semester, 2006.
Date of Defense: June 22, 2006.
Keywords: Cumulus Clouds, Cloud Radiative Effects, 3D Radiation
Bibliography Note: Includes bibliographical references.
Advisory committee: Guosheng Liu, Professor Co-Directing Thesis; Ezra Takara, Professor Co-Directing Thesis; Xiaolei Zou, Committee Member; Paul Ruscher, Committee Member.
Subject(s): Meteorology
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_migr_etd-1659
Owner Institution: FSU

Choose the citation style.
Taylor, P. C. (2006). A Study of the Probability of Clear Line of Sight Through Single-Layer Cumulus Cloud Fields in the Tropical Western Pacific. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-1659