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Separate the Role of Southern and Northern Extra‐Tropical Pacific in Tropical Pacific Climate Variability

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Title: Separate the Role of Southern and Northern Extra‐Tropical Pacific in Tropical Pacific Climate Variability
Authors: Yingying Zhao, Daoxun Sun, Emanuele Di Lorenzo, Guangpeng Liu, Sheng Wu
Source: Geophysical Research Letters, Vol 51, Iss 16, Pp n/a-n/a (2024)
Publisher Information: Wiley, 2024.
Publication Year: 2024
Collection: LCC:Geophysics. Cosmic physics
Subject Terms: ENSO, tropical Pacific low‐frequency variability, extratropical Pacific‐tropical Pacific interaction, linear inverse model, CMIP6 models, Geophysics. Cosmic physics, QC801-809
More Details: Abstract Observational and modeling studies have elucidated the influential role played by the southern and northern extratropical Pacific (SEP and NEP) forcing in shaping dynamics of tropical Pacific climate variability. However, the relative importance of the NEP and SEP and the timescale on which they impact the tropics remain unclear. Using a linear inverse model (LIM) that selectively incorporates or excludes tropical‐extratropical coupling, we find a reduction in tropical interannual variability (∼40%) and low‐frequency (sub‐decadal to decadal) variability in the southeastern tropical Pacific region (∼70%) in the absence of SEP. Conversely, the absence of NEP yields no significant impact on tropical interannual variability but markedly diminishes low‐frequency variability in the central tropical Pacific region (∼70%). LIM and statistic diagnostics on CMIP6 models show the low‐frequency to total variability ratio in the tropical Pacific depending on their NEP and SEP representation. Models with more (less) low‐frequency power tend to show stronger NEP (SEP) dynamics.
Document Type: article
File Description: electronic resource
Language: English
ISSN: 1944-8007
0094-8276
Relation: https://doaj.org/toc/0094-8276; https://doaj.org/toc/1944-8007
DOI: 10.1029/2024GL109466
Access URL: https://doaj.org/article/b5ab19a7ded3431891ba59cff6d8208f
Accession Number: edsdoj.b5ab19a7ded3431891ba59cff6d8208f
Database: Directory of Open Access Journals
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  Data: Separate the Role of Southern and Northern Extra‐Tropical Pacific in Tropical Pacific Climate Variability
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  Data: <searchLink fieldCode="AR" term="%22Yingying+Zhao%22">Yingying Zhao</searchLink><br /><searchLink fieldCode="AR" term="%22Daoxun+Sun%22">Daoxun Sun</searchLink><br /><searchLink fieldCode="AR" term="%22Emanuele+Di+Lorenzo%22">Emanuele Di Lorenzo</searchLink><br /><searchLink fieldCode="AR" term="%22Guangpeng+Liu%22">Guangpeng Liu</searchLink><br /><searchLink fieldCode="AR" term="%22Sheng+Wu%22">Sheng Wu</searchLink>
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  Data: Geophysical Research Letters, Vol 51, Iss 16, Pp n/a-n/a (2024)
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  Data: Abstract Observational and modeling studies have elucidated the influential role played by the southern and northern extratropical Pacific (SEP and NEP) forcing in shaping dynamics of tropical Pacific climate variability. However, the relative importance of the NEP and SEP and the timescale on which they impact the tropics remain unclear. Using a linear inverse model (LIM) that selectively incorporates or excludes tropical‐extratropical coupling, we find a reduction in tropical interannual variability (∼40%) and low‐frequency (sub‐decadal to decadal) variability in the southeastern tropical Pacific region (∼70%) in the absence of SEP. Conversely, the absence of NEP yields no significant impact on tropical interannual variability but markedly diminishes low‐frequency variability in the central tropical Pacific region (∼70%). LIM and statistic diagnostics on CMIP6 models show the low‐frequency to total variability ratio in the tropical Pacific depending on their NEP and SEP representation. Models with more (less) low‐frequency power tend to show stronger NEP (SEP) dynamics.
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        Value: 10.1029/2024GL109466
    Languages:
      – Text: English
    Subjects:
      – SubjectFull: ENSO
        Type: general
      – SubjectFull: tropical Pacific low‐frequency variability
        Type: general
      – SubjectFull: extratropical Pacific‐tropical Pacific interaction
        Type: general
      – SubjectFull: linear inverse model
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      – SubjectFull: CMIP6 models
        Type: general
      – SubjectFull: Geophysics. Cosmic physics
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      – SubjectFull: QC801-809
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      – TitleFull: Separate the Role of Southern and Northern Extra‐Tropical Pacific in Tropical Pacific Climate Variability
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            NameFull: Sheng Wu
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              Y: 2024
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