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    On the Growth and Decay of the Subtropical Dipole Mode in the South Atlantic

    Source: Journal of Climate:;2011:;volume( 024 ):;issue: 021::page 5538
    Author:
    Morioka, Yushi
    ,
    Tozuka, Tomoki
    ,
    Yamagata, Toshio
    DOI: 10.1175/2011JCLI4010.1
    Publisher: American Meteorological Society
    Abstract: sing observational data and outputs from an ocean general circulation model, the growth and decay of the South Atlantic subtropical dipole (SASD) are studied. The SASD is the most dominant mode of interannual variability in the South Atlantic Ocean, and its sea surface temperature (SST) anomaly shows a dipole pattern that is oriented in the northeast?southwest direction. The positive (negative) pole develops because the warming of the mixed layer by the contribution from the climatological shortwave radiation is enhanced (suppressed) when the mixed layer is thinner (thicker) than normal. The mixed layer depth anomaly over the positive (negative) pole is due to the suppressed (enhanced) latent heat flux loss associated with the southward migration and strengthening of the subtropical high. During the decay phase, since the temperature difference between the mixed layer and the entrained water becomes anomalously large (small) as a result of the positive (negative) mixed layer temperature anomaly, the cooling of the mixed layer by the entrainment is enhanced (reduced). In addition, the cooling of the mixed layer by the contribution from the climatological latent heat flux is enhanced (suppressed) by the same thinner (thicker) mixed layer. This paper demonstrates the importance of taking into account the interannual variations of the mixed layer depth in discussing the growth and decay of SST anomalies associated with the SASD.
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      On the Growth and Decay of the Subtropical Dipole Mode in the South Atlantic

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4213798
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    contributor authorMorioka, Yushi
    contributor authorTozuka, Tomoki
    contributor authorYamagata, Toshio
    date accessioned2017-06-09T16:40:03Z
    date available2017-06-09T16:40:03Z
    date copyright2011/11/01
    date issued2011
    identifier issn0894-8755
    identifier otherams-71860.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4213798
    description abstractsing observational data and outputs from an ocean general circulation model, the growth and decay of the South Atlantic subtropical dipole (SASD) are studied. The SASD is the most dominant mode of interannual variability in the South Atlantic Ocean, and its sea surface temperature (SST) anomaly shows a dipole pattern that is oriented in the northeast?southwest direction. The positive (negative) pole develops because the warming of the mixed layer by the contribution from the climatological shortwave radiation is enhanced (suppressed) when the mixed layer is thinner (thicker) than normal. The mixed layer depth anomaly over the positive (negative) pole is due to the suppressed (enhanced) latent heat flux loss associated with the southward migration and strengthening of the subtropical high. During the decay phase, since the temperature difference between the mixed layer and the entrained water becomes anomalously large (small) as a result of the positive (negative) mixed layer temperature anomaly, the cooling of the mixed layer by the entrainment is enhanced (reduced). In addition, the cooling of the mixed layer by the contribution from the climatological latent heat flux is enhanced (suppressed) by the same thinner (thicker) mixed layer. This paper demonstrates the importance of taking into account the interannual variations of the mixed layer depth in discussing the growth and decay of SST anomalies associated with the SASD.
    publisherAmerican Meteorological Society
    titleOn the Growth and Decay of the Subtropical Dipole Mode in the South Atlantic
    typeJournal Paper
    journal volume24
    journal issue21
    journal titleJournal of Climate
    identifier doi10.1175/2011JCLI4010.1
    journal fristpage5538
    journal lastpage5554
    treeJournal of Climate:;2011:;volume( 024 ):;issue: 021
    contenttypeFulltext
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