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Title: A case study of microphysical structures and hydrometeor phase in convection using radar Doppler spectra at Darwin, Australia

Abstract

To understand the microphysical processes that impact diabatic heating and cloud lifetimes in convection, we need to characterize the spatial distribution of supercooled liquid water. To address this observational challenge, vertically pointing active sensors at the Darwin Atmospheric Radiation Measurement (ARM) site are used to classify cloud phase within a deep convective cloud in a shallow to deep convection transitional case. The cloud cannot be fully observed by a lidar due to signal attenuation. Thus we develop an objective method for identifying hydrometeor classes, including mixed-phase conditions, using k-means clustering on parameters that describe the shape of the Doppler spectra from vertically pointing Ka band cloud radar. This approach shows that multiple, overlapping mixed-phase layers exist within the cloud, rather than a single region of supercooled liquid, indicating complexity to how ice growth and diabatic heating occurs in the vertical structure of the cloud.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1378031
Report Number(s):
PNNL-SA-125513
Journal ID: ISSN 0094-8276; KP1701000
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 44; Journal Issue: 14; Related Information: 7519-7527; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Riihimaki, Laura D., Comstock, Jennifer M., Luke, Edward, Thorsen, Tyler J., and Fu, Qiang. A case study of microphysical structures and hydrometeor phase in convection using radar Doppler spectra at Darwin, Australia. United States: N. p., 2017. Web. doi:10.1002/2017GL074187.
Riihimaki, Laura D., Comstock, Jennifer M., Luke, Edward, Thorsen, Tyler J., & Fu, Qiang. A case study of microphysical structures and hydrometeor phase in convection using radar Doppler spectra at Darwin, Australia. United States. doi:10.1002/2017GL074187.
Riihimaki, Laura D., Comstock, Jennifer M., Luke, Edward, Thorsen, Tyler J., and Fu, Qiang. Fri . "A case study of microphysical structures and hydrometeor phase in convection using radar Doppler spectra at Darwin, Australia". United States. doi:10.1002/2017GL074187.
@article{osti_1378031,
title = {A case study of microphysical structures and hydrometeor phase in convection using radar Doppler spectra at Darwin, Australia},
author = {Riihimaki, Laura D. and Comstock, Jennifer M. and Luke, Edward and Thorsen, Tyler J. and Fu, Qiang},
abstractNote = {To understand the microphysical processes that impact diabatic heating and cloud lifetimes in convection, we need to characterize the spatial distribution of supercooled liquid water. To address this observational challenge, vertically pointing active sensors at the Darwin Atmospheric Radiation Measurement (ARM) site are used to classify cloud phase within a deep convective cloud in a shallow to deep convection transitional case. The cloud cannot be fully observed by a lidar due to signal attenuation. Thus we develop an objective method for identifying hydrometeor classes, including mixed-phase conditions, using k-means clustering on parameters that describe the shape of the Doppler spectra from vertically pointing Ka band cloud radar. This approach shows that multiple, overlapping mixed-phase layers exist within the cloud, rather than a single region of supercooled liquid, indicating complexity to how ice growth and diabatic heating occurs in the vertical structure of the cloud.},
doi = {10.1002/2017GL074187},
journal = {Geophysical Research Letters},
issn = {0094-8276},
number = 14,
volume = 44,
place = {United States},
year = {2017},
month = {7}
}

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