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    Remote Vegetation Feedbacks and the Mid-Holocene Green Sahara

    Source: Journal of Climate:;2014:;volume( 027 ):;issue: 013::page 4857
    Author:
    Swann, Abigail L. S.
    ,
    Fung, Inez Y.
    ,
    Liu, Yuwei
    ,
    Chiang, John C. H.
    DOI: 10.1175/JCLI-D-13-00690.1
    Publisher: American Meteorological Society
    Abstract: n the mid-Holocene, the climate of northern Africa was characterized by wetter conditions than present, as evidenced by higher paleolake levels and pollen assemblages of savannah vegetation suggesting a wetter, greener Sahara. Previous modeling studies have struggled to simulate sufficient amounts of precipitation when considering orbital forcing alone, with limited improvement from considering the effects of local grasslands. Here it is proposed that remote forcing from expanded forest cover in Eurasia relative to today is capable of shifting the intertropical convergence zone northward, resulting in an enhancement in precipitation over northern Africa approximately 6000 years ago greater than that resulting from orbital forcing and local vegetation alone. It is demonstrated that the remote and local forcing of atmospheric circulation by vegetation can lead to different dynamical patterns with consequences for precipitation across the globe. These ecoclimate teleconnections represent the linkages between the land surface in different regions of the globe and by inference show that proxy records of plant cover represent not only the response of vegetation to local climate but also that vegetation?s influence on global climate patterns.
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      Remote Vegetation Feedbacks and the Mid-Holocene Green Sahara

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4223216
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    contributor authorSwann, Abigail L. S.
    contributor authorFung, Inez Y.
    contributor authorLiu, Yuwei
    contributor authorChiang, John C. H.
    date accessioned2017-06-09T17:09:39Z
    date available2017-06-09T17:09:39Z
    date copyright2014/07/01
    date issued2014
    identifier issn0894-8755
    identifier otherams-80335.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4223216
    description abstractn the mid-Holocene, the climate of northern Africa was characterized by wetter conditions than present, as evidenced by higher paleolake levels and pollen assemblages of savannah vegetation suggesting a wetter, greener Sahara. Previous modeling studies have struggled to simulate sufficient amounts of precipitation when considering orbital forcing alone, with limited improvement from considering the effects of local grasslands. Here it is proposed that remote forcing from expanded forest cover in Eurasia relative to today is capable of shifting the intertropical convergence zone northward, resulting in an enhancement in precipitation over northern Africa approximately 6000 years ago greater than that resulting from orbital forcing and local vegetation alone. It is demonstrated that the remote and local forcing of atmospheric circulation by vegetation can lead to different dynamical patterns with consequences for precipitation across the globe. These ecoclimate teleconnections represent the linkages between the land surface in different regions of the globe and by inference show that proxy records of plant cover represent not only the response of vegetation to local climate but also that vegetation?s influence on global climate patterns.
    publisherAmerican Meteorological Society
    titleRemote Vegetation Feedbacks and the Mid-Holocene Green Sahara
    typeJournal Paper
    journal volume27
    journal issue13
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-13-00690.1
    journal fristpage4857
    journal lastpage4870
    treeJournal of Climate:;2014:;volume( 027 ):;issue: 013
    contenttypeFulltext
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