Cloud Morphology Evolution in Arctic Cold–Air Outbreak: Two Cases During COMBLE Period
Cloud feedbacks play an important role in Arctic warming. Cloud morphology, for example, cloud size and spatial distributions, is among key factors that directly impact their radiative effects. In this work, we use two cases observed during the Cold-air Outbreak (CAO) in the Marine Boundary Layer Ex...
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Online Access: | http://www.osti.gov/servlets/purl/1886267 https://www.osti.gov/biblio/1886267 https://doi.org/10.1029/2021jd035966 |
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ftosti:oai:osti.gov:1886267 2023-07-30T04:01:16+02:00 Cloud Morphology Evolution in Arctic Cold–Air Outbreak: Two Cases During COMBLE Period Wu, Peng Ovchinnikov, Mikhail 2022-09-15 application/pdf http://www.osti.gov/servlets/purl/1886267 https://www.osti.gov/biblio/1886267 https://doi.org/10.1029/2021jd035966 unknown http://www.osti.gov/servlets/purl/1886267 https://www.osti.gov/biblio/1886267 https://doi.org/10.1029/2021jd035966 doi:10.1029/2021jd035966 54 ENVIRONMENTAL SCIENCES 2022 ftosti https://doi.org/10.1029/2021jd035966 2023-07-11T10:14:45Z Cloud feedbacks play an important role in Arctic warming. Cloud morphology, for example, cloud size and spatial distributions, is among key factors that directly impact their radiative effects. In this work, we use two cases observed during the Cold-air Outbreak (CAO) in the Marine Boundary Layer Experiment (COMBLE) to study the evolution of cloud size distributions as an air mass is advected from the Arctic over a comparatively warm ocean and cloud mesoscale organization changes from rolls to cells. Cloud objects are identified from Moderate Resolution Imaging Spectroradiometer (MODIS) reflectance images through an object segmentation procedure and roll breakup is identified by homogeneities in cloud water path (CWP). Roll breakup is found to be accompanied by a local minimum in wind shear and local maxima in cloud size and marine cold air outbreak index. The mean cloud horizontal aspect ratio has weak fetch dependency and is around 2 in roll, transition, and cell regimes. Regardless of distance from the ice edge, smaller clouds (<10 km 2 ) dominate the population number but not cloud cover. Cloud size distributions show bimodality in transition and cell regimes. For clouds with comparable sizes, mean nearest neighbor distances normalized by equivalent cloud radius converge to a single value for all regimes and for all but the smallest clouds, suggesting that clouds of comparable sizes in CAOs are separated by distance proportional to their sizes. The presented statistical results pave the way to evaluating model simulated cloud organizations during CAO events. Other/Unknown Material Arctic SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Arctic Journal of Geophysical Research: Atmospheres 127 10 |
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Open Polar |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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ftosti |
language |
unknown |
topic |
54 ENVIRONMENTAL SCIENCES |
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54 ENVIRONMENTAL SCIENCES Wu, Peng Ovchinnikov, Mikhail Cloud Morphology Evolution in Arctic Cold–Air Outbreak: Two Cases During COMBLE Period |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
Cloud feedbacks play an important role in Arctic warming. Cloud morphology, for example, cloud size and spatial distributions, is among key factors that directly impact their radiative effects. In this work, we use two cases observed during the Cold-air Outbreak (CAO) in the Marine Boundary Layer Experiment (COMBLE) to study the evolution of cloud size distributions as an air mass is advected from the Arctic over a comparatively warm ocean and cloud mesoscale organization changes from rolls to cells. Cloud objects are identified from Moderate Resolution Imaging Spectroradiometer (MODIS) reflectance images through an object segmentation procedure and roll breakup is identified by homogeneities in cloud water path (CWP). Roll breakup is found to be accompanied by a local minimum in wind shear and local maxima in cloud size and marine cold air outbreak index. The mean cloud horizontal aspect ratio has weak fetch dependency and is around 2 in roll, transition, and cell regimes. Regardless of distance from the ice edge, smaller clouds (<10 km 2 ) dominate the population number but not cloud cover. Cloud size distributions show bimodality in transition and cell regimes. For clouds with comparable sizes, mean nearest neighbor distances normalized by equivalent cloud radius converge to a single value for all regimes and for all but the smallest clouds, suggesting that clouds of comparable sizes in CAOs are separated by distance proportional to their sizes. The presented statistical results pave the way to evaluating model simulated cloud organizations during CAO events. |
author |
Wu, Peng Ovchinnikov, Mikhail |
author_facet |
Wu, Peng Ovchinnikov, Mikhail |
author_sort |
Wu, Peng |
title |
Cloud Morphology Evolution in Arctic Cold–Air Outbreak: Two Cases During COMBLE Period |
title_short |
Cloud Morphology Evolution in Arctic Cold–Air Outbreak: Two Cases During COMBLE Period |
title_full |
Cloud Morphology Evolution in Arctic Cold–Air Outbreak: Two Cases During COMBLE Period |
title_fullStr |
Cloud Morphology Evolution in Arctic Cold–Air Outbreak: Two Cases During COMBLE Period |
title_full_unstemmed |
Cloud Morphology Evolution in Arctic Cold–Air Outbreak: Two Cases During COMBLE Period |
title_sort |
cloud morphology evolution in arctic cold–air outbreak: two cases during comble period |
publishDate |
2022 |
url |
http://www.osti.gov/servlets/purl/1886267 https://www.osti.gov/biblio/1886267 https://doi.org/10.1029/2021jd035966 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
http://www.osti.gov/servlets/purl/1886267 https://www.osti.gov/biblio/1886267 https://doi.org/10.1029/2021jd035966 doi:10.1029/2021jd035966 |
op_doi |
https://doi.org/10.1029/2021jd035966 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
127 |
container_issue |
10 |
_version_ |
1772812013890699264 |