Post Cold Frontal Clouds at the ARM Eastern North Atlantic Site: An Examination of the Relationship Between Large-Scale Environment and Low-Level Cloud Properties
Using cloud and environment observations from the Atmospheric Radiation Measurement program Eastern North Atlantic site and an automated cold front detection routine, cloud properties in post-cold front (PCF) periods are examined and compared to similar conditions of subsidence (non-PCF). PCF period...
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Online Access: | http://www.osti.gov/servlets/purl/1594074 https://www.osti.gov/biblio/1594074 https://doi.org/10.1029/2018JD029015 |
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ftosti:oai:osti.gov:1594074 2023-07-30T04:05:19+02:00 Post Cold Frontal Clouds at the ARM Eastern North Atlantic Site: An Examination of the Relationship Between Large-Scale Environment and Low-Level Cloud Properties Naud, Catherine M. Booth, James F. Lamraoui, Fayçal 2021-09-02 application/pdf http://www.osti.gov/servlets/purl/1594074 https://www.osti.gov/biblio/1594074 https://doi.org/10.1029/2018JD029015 unknown http://www.osti.gov/servlets/purl/1594074 https://www.osti.gov/biblio/1594074 https://doi.org/10.1029/2018JD029015 doi:10.1029/2018JD029015 58 GEOSCIENCES 2021 ftosti https://doi.org/10.1029/2018JD029015 2023-07-11T09:39:14Z Using cloud and environment observations from the Atmospheric Radiation Measurement program Eastern North Atlantic site and an automated cold front detection routine, cloud properties in post-cold front (PCF) periods are examined and compared to similar conditions of subsidence (non-PCF). PCF periods exhibit stronger subsidence and wind speed than non-PCF periods, with weaker inversions and stronger surface temperature contrasts. Low-level clouds are predominant and are found to have higher cloud-base and top heights, colder cloud-top temperature, as well as greater vertical extent and liquid water path during PCF than non-PCF periods. The environmental metric that is best correlated with cloud boundaries for both PCF and non-PCF periods is the difference in potential temperature between the sea surface and 800 hPa, a parameter used to locate cold air outbreak conditions. However, the cloud vertical extent and liquid water path are found to be better correlated with sea-air temperature contrast, a parameter related to turbulent surface fluxes. The strength of the relationships between the cloud characteristics and these metrics does not differ for PCF and non-PCF periods. However, the strength of the metrics differs between PCF and non-PCF periods and can explain cloud property differences. The results suggest both the properties of the boundary layer and the presence of an upper-level cyclone associated with the cold front determine PCF cloud properties. Other/Unknown Material North Atlantic SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Journal of Geophysical Research: Atmospheres 123 21 |
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58 GEOSCIENCES Naud, Catherine M. Booth, James F. Lamraoui, Fayçal Post Cold Frontal Clouds at the ARM Eastern North Atlantic Site: An Examination of the Relationship Between Large-Scale Environment and Low-Level Cloud Properties |
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58 GEOSCIENCES |
description |
Using cloud and environment observations from the Atmospheric Radiation Measurement program Eastern North Atlantic site and an automated cold front detection routine, cloud properties in post-cold front (PCF) periods are examined and compared to similar conditions of subsidence (non-PCF). PCF periods exhibit stronger subsidence and wind speed than non-PCF periods, with weaker inversions and stronger surface temperature contrasts. Low-level clouds are predominant and are found to have higher cloud-base and top heights, colder cloud-top temperature, as well as greater vertical extent and liquid water path during PCF than non-PCF periods. The environmental metric that is best correlated with cloud boundaries for both PCF and non-PCF periods is the difference in potential temperature between the sea surface and 800 hPa, a parameter used to locate cold air outbreak conditions. However, the cloud vertical extent and liquid water path are found to be better correlated with sea-air temperature contrast, a parameter related to turbulent surface fluxes. The strength of the relationships between the cloud characteristics and these metrics does not differ for PCF and non-PCF periods. However, the strength of the metrics differs between PCF and non-PCF periods and can explain cloud property differences. The results suggest both the properties of the boundary layer and the presence of an upper-level cyclone associated with the cold front determine PCF cloud properties. |
author |
Naud, Catherine M. Booth, James F. Lamraoui, Fayçal |
author_facet |
Naud, Catherine M. Booth, James F. Lamraoui, Fayçal |
author_sort |
Naud, Catherine M. |
title |
Post Cold Frontal Clouds at the ARM Eastern North Atlantic Site: An Examination of the Relationship Between Large-Scale Environment and Low-Level Cloud Properties |
title_short |
Post Cold Frontal Clouds at the ARM Eastern North Atlantic Site: An Examination of the Relationship Between Large-Scale Environment and Low-Level Cloud Properties |
title_full |
Post Cold Frontal Clouds at the ARM Eastern North Atlantic Site: An Examination of the Relationship Between Large-Scale Environment and Low-Level Cloud Properties |
title_fullStr |
Post Cold Frontal Clouds at the ARM Eastern North Atlantic Site: An Examination of the Relationship Between Large-Scale Environment and Low-Level Cloud Properties |
title_full_unstemmed |
Post Cold Frontal Clouds at the ARM Eastern North Atlantic Site: An Examination of the Relationship Between Large-Scale Environment and Low-Level Cloud Properties |
title_sort |
post cold frontal clouds at the arm eastern north atlantic site: an examination of the relationship between large-scale environment and low-level cloud properties |
publishDate |
2021 |
url |
http://www.osti.gov/servlets/purl/1594074 https://www.osti.gov/biblio/1594074 https://doi.org/10.1029/2018JD029015 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://www.osti.gov/servlets/purl/1594074 https://www.osti.gov/biblio/1594074 https://doi.org/10.1029/2018JD029015 doi:10.1029/2018JD029015 |
op_doi |
https://doi.org/10.1029/2018JD029015 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
123 |
container_issue |
21 |
_version_ |
1772817156462870528 |