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    Influence of Midlatitude Surface Thermal Anomalies on the Polar Midtroposphere in an Idealized Moist Model

    Source: Journal of the Atmospheric Sciences:;2018:;volume 075:;issue 004::page 1089
    Author:
    Fajber, Robert
    ,
    Kushner, Paul J.
    ,
    Laliberté, Frédéric
    DOI: 10.1175/JAS-D-17-0283.1
    Publisher: American Meteorological Society
    Abstract: AbstractEvidence from models and observations suggests that the vertical distribution of entropy in the extratropical troposphere reflects the horizontal distribution of entropy at the surface. This isentropic linkage, which is accomplished through moist isentropic mass transport driven by extratropical waves, becomes more apparent when the effect of latent heat release by condensing moist parcels is accounted for. This study focuses on the stratification of the Arctic troposphere, which is connected by moist isentropes to the midlatitude surface. A relatively simple moist general circulation model without radiative feedbacks involving water vapor or clouds is used to study the linkage between the midlatitude surface and the Arctic midtroposphere. Zonally symmetric midlatitude thermal perturbations switched on at the surface drive a moist potential temperature response in the Arctic midtroposphere with a lag of about 2 weeks. This response increases the gross moist vertical stability in the Arctic while generally decreasing it, or increasing it only weakly, in the midlatitudes. The moist isentropic streamfunction is shifted poleward owing to the poleward entropy flux response and is shifted upward (i.e., to higher entropy) owing to the zonal-mean entropy response. The results suggest a potential novel mechanism by which the midlatitudes might influence polar lapse rates and their associated radiative feedbacks.
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      Influence of Midlatitude Surface Thermal Anomalies on the Polar Midtroposphere in an Idealized Moist Model

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4261824
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    contributor authorFajber, Robert
    contributor authorKushner, Paul J.
    contributor authorLaliberté, Frédéric
    date accessioned2019-09-19T10:07:36Z
    date available2019-09-19T10:07:36Z
    date copyright1/30/2018 12:00:00 AM
    date issued2018
    identifier otherjas-d-17-0283.1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4261824
    description abstractAbstractEvidence from models and observations suggests that the vertical distribution of entropy in the extratropical troposphere reflects the horizontal distribution of entropy at the surface. This isentropic linkage, which is accomplished through moist isentropic mass transport driven by extratropical waves, becomes more apparent when the effect of latent heat release by condensing moist parcels is accounted for. This study focuses on the stratification of the Arctic troposphere, which is connected by moist isentropes to the midlatitude surface. A relatively simple moist general circulation model without radiative feedbacks involving water vapor or clouds is used to study the linkage between the midlatitude surface and the Arctic midtroposphere. Zonally symmetric midlatitude thermal perturbations switched on at the surface drive a moist potential temperature response in the Arctic midtroposphere with a lag of about 2 weeks. This response increases the gross moist vertical stability in the Arctic while generally decreasing it, or increasing it only weakly, in the midlatitudes. The moist isentropic streamfunction is shifted poleward owing to the poleward entropy flux response and is shifted upward (i.e., to higher entropy) owing to the zonal-mean entropy response. The results suggest a potential novel mechanism by which the midlatitudes might influence polar lapse rates and their associated radiative feedbacks.
    publisherAmerican Meteorological Society
    titleInfluence of Midlatitude Surface Thermal Anomalies on the Polar Midtroposphere in an Idealized Moist Model
    typeJournal Paper
    journal volume75
    journal issue4
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS-D-17-0283.1
    journal fristpage1089
    journal lastpage1104
    treeJournal of the Atmospheric Sciences:;2018:;volume 075:;issue 004
    contenttypeFulltext
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