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    Warm Season Response over North America to a Shutdown of the Atlantic Meridional Overturning Circulation and CO2 Increases

    Source: Journal of Climate:;2012:;volume( 025 ):;issue: 019::page 6701
    Author:
    Pu, Bing
    ,
    Vizy, Edward K.
    ,
    Cook, Kerry H.
    DOI: 10.1175/JCLI-D-11-00611.1
    Publisher: American Meteorological Society
    Abstract: aleo-proxy and modeling evidence suggest that a shutdown of the Atlantic meridional overturning circulation (AMOC) would decrease North Atlantic Ocean sea surface temperatures and have far-reaching climate impacts. The authors use a regional climate model to examine the warm season response over North America to a hypothetical late-twenty-first-century shutdown of the AMOC with increased atmospheric CO2. In the future simulation, precipitation decreases over the western and central United States by up to 40% and over eastern Mexico by up to 50%. Over the eastern United States rainfall generally increases except during July. Variations in the moisture convergence associated with large-scale circulation changes dominate the rainfall variations, while evaporation plays a critical role over the northeastern United States in spring and the north-central United States in summer. During April?June the westward extension of the North Atlantic subtropical high enhances southwesterly moisture fluxes from the Gulf of Mexico into the eastern and south-central United States. Increases in low-level moisture content reduce the stability of the atmosphere. Enhanced southerly winds promote convergence over the eastern United States through the Sverdrup vorticity balance and precipitation increases. In July?August anomalous anticyclonic moisture fluxes associated with an anomalous high over the Gulf of Mexico and eastern Pacific decrease the moisture supply into the United States and Mexico. Over the central United States decreases in evaporation support decreases in low-level moisture content and increases in atmospheric stability. Over the eastern United States the Sverdrup balance weakens in summer and anomalous moisture convergence is mainly located over the East Coast.
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      Warm Season Response over North America to a Shutdown of the Atlantic Meridional Overturning Circulation and CO2 Increases

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4222003
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    contributor authorPu, Bing
    contributor authorVizy, Edward K.
    contributor authorCook, Kerry H.
    date accessioned2017-06-09T17:05:31Z
    date available2017-06-09T17:05:31Z
    date copyright2012/10/01
    date issued2012
    identifier issn0894-8755
    identifier otherams-79244.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4222003
    description abstractaleo-proxy and modeling evidence suggest that a shutdown of the Atlantic meridional overturning circulation (AMOC) would decrease North Atlantic Ocean sea surface temperatures and have far-reaching climate impacts. The authors use a regional climate model to examine the warm season response over North America to a hypothetical late-twenty-first-century shutdown of the AMOC with increased atmospheric CO2. In the future simulation, precipitation decreases over the western and central United States by up to 40% and over eastern Mexico by up to 50%. Over the eastern United States rainfall generally increases except during July. Variations in the moisture convergence associated with large-scale circulation changes dominate the rainfall variations, while evaporation plays a critical role over the northeastern United States in spring and the north-central United States in summer. During April?June the westward extension of the North Atlantic subtropical high enhances southwesterly moisture fluxes from the Gulf of Mexico into the eastern and south-central United States. Increases in low-level moisture content reduce the stability of the atmosphere. Enhanced southerly winds promote convergence over the eastern United States through the Sverdrup vorticity balance and precipitation increases. In July?August anomalous anticyclonic moisture fluxes associated with an anomalous high over the Gulf of Mexico and eastern Pacific decrease the moisture supply into the United States and Mexico. Over the central United States decreases in evaporation support decreases in low-level moisture content and increases in atmospheric stability. Over the eastern United States the Sverdrup balance weakens in summer and anomalous moisture convergence is mainly located over the East Coast.
    publisherAmerican Meteorological Society
    titleWarm Season Response over North America to a Shutdown of the Atlantic Meridional Overturning Circulation and CO2 Increases
    typeJournal Paper
    journal volume25
    journal issue19
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-11-00611.1
    journal fristpage6701
    journal lastpage6720
    treeJournal of Climate:;2012:;volume( 025 ):;issue: 019
    contenttypeFulltext
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