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    Interaction of Vegetation and Atmospheric Dynamical Mechanisms in the Mid-Holocene African Monsoon

    Source: Journal of Climate:;2006:;volume( 019 ):;issue: 016::page 4105
    Author:
    Hales, Katrina
    ,
    Neelin, J. David
    ,
    Zeng, Ning
    DOI: 10.1175/JCLI3833.1
    Publisher: American Meteorological Society
    Abstract: Paleoevidence indicates that generally wetter conditions existed in the Sahara during the mid-Holocene. Climate modeling studies addressing this issue generally agree that mid-Holocene values of the earth?s orbital parameters favored an enhanced North African summer monsoon but also suggest that land surface and vegetation feedbacks must have been important factors. Attempts to reproduce the ?green? mid-Holocene Sahara in model studies with interactive vegetation may be interpreted to indicate that the problem is highly sensitive to the atmospheric dynamics of each model employed. In other work, dynamical mechanisms have been hypothesized to affect monsoon poleward extent, particularly ventilation, by import of low-moist static energy air to the continent. Here, interactive vegetation and the ventilation mechanism are studied in an intermediate complexity atmospheric model coupled to simple land and vegetation components. Interactive vegetation is found to be effective at enhancing the precipitation and vegetation amount in regions where the monsoon has advanced because of changes in orbital parameters or ventilation yet not very effective in moving the monsoon boundary if ventilation is strong. The poleward extent of the mid-Holocene monsoon and the steppe boundary are primarily controlled by the strength of ventilation in the atmospheric model. Within this boundary, the largest changes in monsoon precipitation and vegetation occur when interactive vegetation and reduced ventilation act simultaneously, as these greatly reinforce each other.
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      Interaction of Vegetation and Atmospheric Dynamical Mechanisms in the Mid-Holocene African Monsoon

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    contributor authorHales, Katrina
    contributor authorNeelin, J. David
    contributor authorZeng, Ning
    date accessioned2017-06-09T17:02:09Z
    date available2017-06-09T17:02:09Z
    date copyright2006/08/01
    date issued2006
    identifier issn0894-8755
    identifier otherams-78299.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4220952
    description abstractPaleoevidence indicates that generally wetter conditions existed in the Sahara during the mid-Holocene. Climate modeling studies addressing this issue generally agree that mid-Holocene values of the earth?s orbital parameters favored an enhanced North African summer monsoon but also suggest that land surface and vegetation feedbacks must have been important factors. Attempts to reproduce the ?green? mid-Holocene Sahara in model studies with interactive vegetation may be interpreted to indicate that the problem is highly sensitive to the atmospheric dynamics of each model employed. In other work, dynamical mechanisms have been hypothesized to affect monsoon poleward extent, particularly ventilation, by import of low-moist static energy air to the continent. Here, interactive vegetation and the ventilation mechanism are studied in an intermediate complexity atmospheric model coupled to simple land and vegetation components. Interactive vegetation is found to be effective at enhancing the precipitation and vegetation amount in regions where the monsoon has advanced because of changes in orbital parameters or ventilation yet not very effective in moving the monsoon boundary if ventilation is strong. The poleward extent of the mid-Holocene monsoon and the steppe boundary are primarily controlled by the strength of ventilation in the atmospheric model. Within this boundary, the largest changes in monsoon precipitation and vegetation occur when interactive vegetation and reduced ventilation act simultaneously, as these greatly reinforce each other.
    publisherAmerican Meteorological Society
    titleInteraction of Vegetation and Atmospheric Dynamical Mechanisms in the Mid-Holocene African Monsoon
    typeJournal Paper
    journal volume19
    journal issue16
    journal titleJournal of Climate
    identifier doi10.1175/JCLI3833.1
    journal fristpage4105
    journal lastpage4120
    treeJournal of Climate:;2006:;volume( 019 ):;issue: 016
    contenttypeFulltext
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