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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

Abstract

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 themore » boundary layer and the presence of an upper-level cyclone associated with the cold front determine PCF cloud properties.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]
  1. Applied Physics and Applied MathematicsColumbia University/NASA‐GISS New York NY USA
  2. Earth and Atmospheric SciencesCity University of New York‐City College New York NY USA
Publication Date:
Research Org.:
Columbia Univ., New York, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1480905
Alternate Identifier(s):
OSTI ID: 1480906; OSTI ID: 1594074
Grant/Contract Number:  
SC0016344; DE‐SC0016344
Resource Type:
Published Article
Journal Name:
Journal of Geophysical Research: Atmospheres
Additional Journal Information:
Journal Name: Journal of Geophysical Research: Atmospheres Journal Volume: 123 Journal Issue: 21; Journal ID: ISSN 2169-897X
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; ARM; Eastern North Atlantic; post-cold front; boundary layer clouds; MCAO M-index; cloud properties; large-scale drivers

Citation Formats

Naud, Catherine M., Booth, James F., and 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. United States: N. p., 2018. Web. doi:10.1029/2018JD029015.
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. United States. doi:https://doi.org/10.1029/2018JD029015
Naud, Catherine M., Booth, James F., and Lamraoui, Fayçal. Mon . "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". United States. doi:https://doi.org/10.1029/2018JD029015.
@article{osti_1480905,
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},
author = {Naud, Catherine M. and Booth, James F. and Lamraoui, Fayçal},
abstractNote = {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.},
doi = {10.1029/2018JD029015},
journal = {Journal of Geophysical Research: Atmospheres},
number = 21,
volume = 123,
place = {United States},
year = {2018},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: https://doi.org/10.1029/2018JD029015

Citation Metrics:
Cited by: 2 works
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Works referenced in this record:

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    Works referencing / citing this record:

    The Interaction Between Boundary Layer and Convection Schemes in a WRF Simulation of Post Cold Frontal Clouds Over the ARM East North Atlantic Site
    journal, April 2019

    • Lamraoui, Fayçal; Booth, James F.; Naud, Catherine M.
    • Journal of Geophysical Research: Atmospheres, Vol. 124, Issue 8
    • DOI: 10.1029/2018jd029370

    Midlatitude Oceanic Cloud and Precipitation Properties as Sampled by the ARM Eastern North Atlantic Observatory
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    • Giangrande, Scott E.; Wang, Die; Bartholomew, Mary Jane
    • Journal of Geophysical Research: Atmospheres, Vol. 124, Issue 8
    • DOI: 10.1029/2018jd029667