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    A Characterization of Cold Pools in the West African Sahel

    Source: Monthly Weather Review:;2015:;volume( 144 ):;issue: 005::page 1923
    Author:
    Provod, M.
    ,
    Marsham, J. H.
    ,
    Parker, D. J.
    ,
    Birch, C. E.
    DOI: 10.1175/MWR-D-15-0023.1
    Publisher: American Meteorological Society
    Abstract: old pools are integral components of squall-line mesoscale convective systems and the West African monsoon, but are poorly represented in operational global models. Observations of 38 cold pools made at Niamey, Niger, during the 2006 African Monsoon Multidisciplinary Analysis (AMMA) campaign (1 June?30 September 2006), are used to generate a seasonal characterization of cold pool properties by quantifying related changes in surface meteorological variables. Cold pools were associated with temperature decreases of 2°?14°C, pressure increases of 0?8 hPa, and wind gusts of 3?22 m s?1. Comparison with published values of similar variables from the U.S. Great Plains showed comparable differences. The leading part of most cold pools had decreased water vapor mixing ratios compared to the environment, with moister air, likely related to precipitation, approximately 30 min behind the gust front. A novel diagnostic used to quantify how consistent observed cold pool temperatures are with saturated or unsaturated descent from midlevels [fractional evaporational energy deficit (FEED)] shows that early season cold pools are consistent with less saturated descents. Early season cold pools were relatively colder, windier, and wetter, consistent with drier midlevels, although this was only statistically significant for the change in moisture. Late season cold pools tended to decrease equivalent potential temperature from the pre?cold pool value, whereas earlier in the season changes were smaller, with more increases. The role of cold pools may therefore change through the season, with early season cold pools more able to feed subsequent convection.
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      A Characterization of Cold Pools in the West African Sahel

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    contributor authorProvod, M.
    contributor authorMarsham, J. H.
    contributor authorParker, D. J.
    contributor authorBirch, C. E.
    date accessioned2017-06-09T17:32:58Z
    date available2017-06-09T17:32:58Z
    date copyright2016/05/01
    date issued2015
    identifier issn0027-0644
    identifier otherams-87079.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4230708
    description abstractold pools are integral components of squall-line mesoscale convective systems and the West African monsoon, but are poorly represented in operational global models. Observations of 38 cold pools made at Niamey, Niger, during the 2006 African Monsoon Multidisciplinary Analysis (AMMA) campaign (1 June?30 September 2006), are used to generate a seasonal characterization of cold pool properties by quantifying related changes in surface meteorological variables. Cold pools were associated with temperature decreases of 2°?14°C, pressure increases of 0?8 hPa, and wind gusts of 3?22 m s?1. Comparison with published values of similar variables from the U.S. Great Plains showed comparable differences. The leading part of most cold pools had decreased water vapor mixing ratios compared to the environment, with moister air, likely related to precipitation, approximately 30 min behind the gust front. A novel diagnostic used to quantify how consistent observed cold pool temperatures are with saturated or unsaturated descent from midlevels [fractional evaporational energy deficit (FEED)] shows that early season cold pools are consistent with less saturated descents. Early season cold pools were relatively colder, windier, and wetter, consistent with drier midlevels, although this was only statistically significant for the change in moisture. Late season cold pools tended to decrease equivalent potential temperature from the pre?cold pool value, whereas earlier in the season changes were smaller, with more increases. The role of cold pools may therefore change through the season, with early season cold pools more able to feed subsequent convection.
    publisherAmerican Meteorological Society
    titleA Characterization of Cold Pools in the West African Sahel
    typeJournal Paper
    journal volume144
    journal issue5
    journal titleMonthly Weather Review
    identifier doi10.1175/MWR-D-15-0023.1
    journal fristpage1923
    journal lastpage1934
    treeMonthly Weather Review:;2015:;volume( 144 ):;issue: 005
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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