Phase characterization of cold sector southern ocean cloud tops: Results from SOCRATES
For a given cloud, whether the cloud top is predominately made up of ice crystals or supercooled liquid droplets plays a large role in the clouds overall radiative effects. This study uses collocated airborne radar, lidar, and thermodynamic data from 12 high-altitude flight legs during the Southern...
Published in: | Journal of Geophysical Research: Atmospheres |
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Language: | English |
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Online Access: | https://doi.org/10.1029/2020JD033673 |
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ftncar:oai:drupal-site.org:articles_24017 2024-04-14T08:19:57+00:00 Phase characterization of cold sector southern ocean cloud tops: Results from SOCRATES Zaremba, Troy J. (author) Rauber, Robert M. (author) McFarquhar, Greg M. (author) Hayman, Matthew (author) Finlon, Joseph A. (author) Stechman, Daniel M. (author) 2020-12-27 https://doi.org/10.1029/2020JD033673 en eng Journal of Geophysical Research: Atmospheres--J. Geophys. Res. Atmos.--2169-897X--2169-8996 SOCRATES: NCAR HCR radar and HSRL lidar moments data. Version 3.2--10.5065/D64J0CZS SOCRATES: NCAR HCR radar time series data. Version 1.0--10.5065/D6D7998S SOCRATES: Low Rate (LRT - 1 sps) Navigation, State Parameter, and Microphysics Flight-Level Data. Version 1.3--10.5065/D6M32TM9 NCAR/EOL Quality Controlled Dropsonde Data. Version 1.1--10.5065/D6QZ28SG articles:24017 ark:/85065/d7bv7m0z doi:10.1029/2020JD033673 Copyright 2020 American Geophysical Union. article Text 2020 ftncar https://doi.org/10.1029/2020JD033673 2024-03-21T18:00:26Z For a given cloud, whether the cloud top is predominately made up of ice crystals or supercooled liquid droplets plays a large role in the clouds overall radiative effects. This study uses collocated airborne radar, lidar, and thermodynamic data from 12 high-altitude flight legs during the Southern Ocean Clouds, Radiation, Aerosol Transport Experimental Study (SOCRATES) to characterize Southern Ocean (SO) cold sector cloud top phase (i.e., within 96 m of top) as a function of cloud top temperature (CTT). A training data set was developed to create probabilistic phase classifications based on High Spectral Resolution Lidar data and Cloud Radar data. These classifications were then used to identify dominant cloud top phase. Case studies are presented illustrating examples of supercooled liquid water at cloud top at different CTT ranges over the SO (-3 degrees C < CTTs < -28 degrees C). During SOCRATES, 67.4% of sampled cloud top had CTTs less than 0 degrees C. Of the subfreezing cloud tops sampled, 91.7% had supercooled liquid water present in the top 96 m and 74.9% were classified entirely as liquid-bearing. Liquid-bearing cloud tops were found at CTTs as cold as -30 degrees C. Horizontal cloud extent was also determined as a function of median cloud top height. Article in Journal/Newspaper Southern Ocean OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Southern Ocean Journal of Geophysical Research: Atmospheres 125 24 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
For a given cloud, whether the cloud top is predominately made up of ice crystals or supercooled liquid droplets plays a large role in the clouds overall radiative effects. This study uses collocated airborne radar, lidar, and thermodynamic data from 12 high-altitude flight legs during the Southern Ocean Clouds, Radiation, Aerosol Transport Experimental Study (SOCRATES) to characterize Southern Ocean (SO) cold sector cloud top phase (i.e., within 96 m of top) as a function of cloud top temperature (CTT). A training data set was developed to create probabilistic phase classifications based on High Spectral Resolution Lidar data and Cloud Radar data. These classifications were then used to identify dominant cloud top phase. Case studies are presented illustrating examples of supercooled liquid water at cloud top at different CTT ranges over the SO (-3 degrees C < CTTs < -28 degrees C). During SOCRATES, 67.4% of sampled cloud top had CTTs less than 0 degrees C. Of the subfreezing cloud tops sampled, 91.7% had supercooled liquid water present in the top 96 m and 74.9% were classified entirely as liquid-bearing. Liquid-bearing cloud tops were found at CTTs as cold as -30 degrees C. Horizontal cloud extent was also determined as a function of median cloud top height. |
author2 |
Zaremba, Troy J. (author) Rauber, Robert M. (author) McFarquhar, Greg M. (author) Hayman, Matthew (author) Finlon, Joseph A. (author) Stechman, Daniel M. (author) |
format |
Article in Journal/Newspaper |
title |
Phase characterization of cold sector southern ocean cloud tops: Results from SOCRATES |
spellingShingle |
Phase characterization of cold sector southern ocean cloud tops: Results from SOCRATES |
title_short |
Phase characterization of cold sector southern ocean cloud tops: Results from SOCRATES |
title_full |
Phase characterization of cold sector southern ocean cloud tops: Results from SOCRATES |
title_fullStr |
Phase characterization of cold sector southern ocean cloud tops: Results from SOCRATES |
title_full_unstemmed |
Phase characterization of cold sector southern ocean cloud tops: Results from SOCRATES |
title_sort |
phase characterization of cold sector southern ocean cloud tops: results from socrates |
publishDate |
2020 |
url |
https://doi.org/10.1029/2020JD033673 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
Journal of Geophysical Research: Atmospheres--J. Geophys. Res. Atmos.--2169-897X--2169-8996 SOCRATES: NCAR HCR radar and HSRL lidar moments data. Version 3.2--10.5065/D64J0CZS SOCRATES: NCAR HCR radar time series data. Version 1.0--10.5065/D6D7998S SOCRATES: Low Rate (LRT - 1 sps) Navigation, State Parameter, and Microphysics Flight-Level Data. Version 1.3--10.5065/D6M32TM9 NCAR/EOL Quality Controlled Dropsonde Data. Version 1.1--10.5065/D6QZ28SG articles:24017 ark:/85065/d7bv7m0z doi:10.1029/2020JD033673 |
op_rights |
Copyright 2020 American Geophysical Union. |
op_doi |
https://doi.org/10.1029/2020JD033673 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
125 |
container_issue |
24 |
_version_ |
1796298104922701824 |