The Microphysical and Radiative Properties of Tropical Cirrus From the 2006 Tropical Warm Pool International Cloud Experiment (twp-Ice)

Um, Jun Shik

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Description

Title

The Microphysical and Radiative Properties of Tropical Cirrus From the 2006 Tropical Warm Pool International Cloud Experiment (twp-Ice)

Author(s)

Um, Jun Shik

Issue Date

2009

Doctoral Committee Chair(s)

McFarquhar, Greg M.

Department of Study

Atmospheric Sciences

Discipline

Atmospheric Sciences

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

Ph.D.

Degree Level

Dissertation

Keyword(s)

Physics, Optics

Language

eng

Abstract

The impacts of variations in small ice crystal shapes and concentrations on bulk scattering properties of tropical cirrus are quantified. The calculated mean asymmetry parameter g¯ for the fresh anvil (i.e., 2 Feb) is larger than that for cirrus bands of varying ages (i.e., 27 and 29 Jan.) for -60 < T < -45°C and -45 < T < -30°C where the fractional contributions of small ice crystals to total cross sectional area are small. The impact using different models for small ice crystals on g¯ is largest at lower temperatures (T < -60°C). The impact of enhanced number concentrations of small ice crystals on the bulk scattering properties depends on the assumed shapes of small ice crystals, which is largest (smallest) in the temperature ranges of -45 < T < -30 T (T < -60°C) where the CAS/CDP ratio of N of small ice crystals is maximum (minimum).

Graduation Semester

2009

Type of Resource

text

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http://hdl.handle.net/2142/85978

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