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    The Role of Oceans and Sea Ice in Abrupt Transitions between Multiple Climate States

    Source: Journal of Climate:;2012:;volume( 026 ):;issue: 009::page 2862
    Author:
    Rose, Brian E. J.
    ,
    Ferreira, David
    ,
    Marshall, John
    DOI: 10.1175/JCLI-D-12-00175.1
    Publisher: American Meteorological Society
    Abstract: he coupled climate dynamics underlying large, rapid, and potentially irreversible changes in ice cover are studied. A global atmosphere?ocean?sea ice general circulation model with idealized aquaplanet geometry is forced by gradual multi-millennial variations in solar luminosity. The model traverses a hysteresis loop between warm ice-free conditions and cold glacial conditions in response to ±5 W m?2 variations in global, annual-mean insolation. Comparison of several model configurations confirms the importance of polar ocean processes in setting the sensitivity and time scales of the transitions. A ?sawtooth? character is found with faster warming and slower cooling, reflecting the opposing effects of surface heating and cooling on upper-ocean buoyancy and, thus, effective heat capacity. The transition from a glacial to warm, equable climate occurs in about 200 years.In contrast to the ?freshwater hosing? scenario, transitions are driven by radiative forcing and sea ice feedbacks. The ocean circulation, and notably the meridional overturning circulation (MOC), does not drive the climate change. The MOC (and associated heat transport) collapses poleward of the advancing ice edge, but this is a purely passive response to cooling and ice expansion. The MOC does, however, play a key role in setting the time scales of the transition and contributes to the asymmetry between warming and cooling.
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      The Role of Oceans and Sea Ice in Abrupt Transitions between Multiple Climate States

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    contributor authorRose, Brian E. J.
    contributor authorFerreira, David
    contributor authorMarshall, John
    date accessioned2017-06-09T17:06:18Z
    date available2017-06-09T17:06:18Z
    date copyright2013/05/01
    date issued2012
    identifier issn0894-8755
    identifier otherams-79453.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4222235
    description abstracthe coupled climate dynamics underlying large, rapid, and potentially irreversible changes in ice cover are studied. A global atmosphere?ocean?sea ice general circulation model with idealized aquaplanet geometry is forced by gradual multi-millennial variations in solar luminosity. The model traverses a hysteresis loop between warm ice-free conditions and cold glacial conditions in response to ±5 W m?2 variations in global, annual-mean insolation. Comparison of several model configurations confirms the importance of polar ocean processes in setting the sensitivity and time scales of the transitions. A ?sawtooth? character is found with faster warming and slower cooling, reflecting the opposing effects of surface heating and cooling on upper-ocean buoyancy and, thus, effective heat capacity. The transition from a glacial to warm, equable climate occurs in about 200 years.In contrast to the ?freshwater hosing? scenario, transitions are driven by radiative forcing and sea ice feedbacks. The ocean circulation, and notably the meridional overturning circulation (MOC), does not drive the climate change. The MOC (and associated heat transport) collapses poleward of the advancing ice edge, but this is a purely passive response to cooling and ice expansion. The MOC does, however, play a key role in setting the time scales of the transition and contributes to the asymmetry between warming and cooling.
    publisherAmerican Meteorological Society
    titleThe Role of Oceans and Sea Ice in Abrupt Transitions between Multiple Climate States
    typeJournal Paper
    journal volume26
    journal issue9
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-12-00175.1
    journal fristpage2862
    journal lastpage2879
    treeJournal of Climate:;2012:;volume( 026 ):;issue: 009
    contenttypeFulltext
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