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    Heat Uptake and the Thermohaline Circulation in the Community Climate System Model, Version 2

    Source: Journal of Climate:;2004:;volume( 017 ):;issue: 020::page 4058
    Author:
    Gent, Peter R.
    ,
    Danabasoglu, Gokhan
    DOI: 10.1175/1520-0442(2004)017<4058:HUATTC>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Ocean heat uptake and the thermohaline circulation are analyzed in present-day control, 1% increasing CO2, and doubled CO2 runs of the Community Climate System Model, version 2 (CCSM2). It is concluded that the observed 40-yr trend in the global heat content to 300 m, found by Levitus et al., is somewhat larger than the natural variability in the CCSM2 control run. The observed 40-yr trend in the global heat content down to a depth of 3 km is much closer to trends found in the control run and is not so clearly separated from the natural model variability. It is estimated that, in a 0.7% increasing CO2 scenario that approximates the effect of increasing greenhouse gases between 1958 and 1998, the CCSM2 40-yr trend in the global heat content to 300 m is about the same as the observed value. This gives support for the CCSM2 climate sensitivity, which is 2.2°C. Both the maximum of the meridional overturning streamfunction and the vertical flow across 1-km depth between 60° and 65°N decrease monotonically during the 1% CO2 run. However, the reductions are quite modest, being 3 and 2 Sv, respectively, when CO2 has quadrupled. The reason for this is that the surface potential density in the northern North Atlantic decreases steadily throughout the 1% CO2 run. In the latter part of the doubled CO2 run, the meridional overturning streamfunction recovers in strength back toward its value in the control run, but the deep-water formation rate across 1-km depth between 60° and 65°N remains at 85% of the control run value. The maximum northward heat transport at 22°N is governed by the maximum of the overturning, but the transport poleward of 62°N appears to be independent of the deep-water formation rate.
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      Heat Uptake and the Thermohaline Circulation in the Community Climate System Model, Version 2

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4208967
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    contributor authorGent, Peter R.
    contributor authorDanabasoglu, Gokhan
    date accessioned2017-06-09T16:25:10Z
    date available2017-06-09T16:25:10Z
    date copyright2004/10/01
    date issued2004
    identifier issn0894-8755
    identifier otherams-6751.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4208967
    description abstractOcean heat uptake and the thermohaline circulation are analyzed in present-day control, 1% increasing CO2, and doubled CO2 runs of the Community Climate System Model, version 2 (CCSM2). It is concluded that the observed 40-yr trend in the global heat content to 300 m, found by Levitus et al., is somewhat larger than the natural variability in the CCSM2 control run. The observed 40-yr trend in the global heat content down to a depth of 3 km is much closer to trends found in the control run and is not so clearly separated from the natural model variability. It is estimated that, in a 0.7% increasing CO2 scenario that approximates the effect of increasing greenhouse gases between 1958 and 1998, the CCSM2 40-yr trend in the global heat content to 300 m is about the same as the observed value. This gives support for the CCSM2 climate sensitivity, which is 2.2°C. Both the maximum of the meridional overturning streamfunction and the vertical flow across 1-km depth between 60° and 65°N decrease monotonically during the 1% CO2 run. However, the reductions are quite modest, being 3 and 2 Sv, respectively, when CO2 has quadrupled. The reason for this is that the surface potential density in the northern North Atlantic decreases steadily throughout the 1% CO2 run. In the latter part of the doubled CO2 run, the meridional overturning streamfunction recovers in strength back toward its value in the control run, but the deep-water formation rate across 1-km depth between 60° and 65°N remains at 85% of the control run value. The maximum northward heat transport at 22°N is governed by the maximum of the overturning, but the transport poleward of 62°N appears to be independent of the deep-water formation rate.
    publisherAmerican Meteorological Society
    titleHeat Uptake and the Thermohaline Circulation in the Community Climate System Model, Version 2
    typeJournal Paper
    journal volume17
    journal issue20
    journal titleJournal of Climate
    identifier doi10.1175/1520-0442(2004)017<4058:HUATTC>2.0.CO;2
    journal fristpage4058
    journal lastpage4069
    treeJournal of Climate:;2004:;volume( 017 ):;issue: 020
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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