Southward displacement of the upper atmosphere zonal jet in the eastern north Pacific due to global warming

Jae Heung Park, Soon Il An

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The jet stream over the eastern North Pacific (ENPJ) as a core of the atmospheric flow is known to strongly fluctuate meridionally, and its meridional displacement directly influences adjacent regional climate. Here, we investigate how this jet will be changed due to global warming. By analyzing the future scenario experiments of Climate Model Intercomparion Project Phase III (CMIP3) and Phase V (5), it was found that both ENPJ and the eastern tropical Pacific intertropical convergence zone (ITCZ) tend to move southward, which are closely related to the tropical eastern Pacific warming trend. Tropical eastern Pacific warming leads to not only the southward migration of ITCZ by southward-shifting the off-equatorial eastern Pacific warm pool, but also the southward shift of ENPJ by increasing baroclinic instability of the atmosphere in subtropical region through intensifying the meridional sea surface temperature (SST) gradient. Not primary but yet secondly the southward shift of ITCZ contributes to the southward shift of ENPJ through a kinematic connection bridged by local Hadley circulation.

Original languageEnglish
Pages (from-to)7861-7867
Number of pages7
JournalGeophysical Research Letters
Volume41
Issue number22
DOIs
Publication statusPublished - 2014 Nov 28

Fingerprint

global warming
intertropical convergence zone
upper atmosphere
shift
subtropical regions
warming
baroclinic instability
heating
warm pool
jet stream
subtropical region
climate models
sea surface temperature
regional climate
temperature gradient
climate
temperature gradients
climate modeling
kinematics
trends

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

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abstract = "The jet stream over the eastern North Pacific (ENPJ) as a core of the atmospheric flow is known to strongly fluctuate meridionally, and its meridional displacement directly influences adjacent regional climate. Here, we investigate how this jet will be changed due to global warming. By analyzing the future scenario experiments of Climate Model Intercomparion Project Phase III (CMIP3) and Phase V (5), it was found that both ENPJ and the eastern tropical Pacific intertropical convergence zone (ITCZ) tend to move southward, which are closely related to the tropical eastern Pacific warming trend. Tropical eastern Pacific warming leads to not only the southward migration of ITCZ by southward-shifting the off-equatorial eastern Pacific warm pool, but also the southward shift of ENPJ by increasing baroclinic instability of the atmosphere in subtropical region through intensifying the meridional sea surface temperature (SST) gradient. Not primary but yet secondly the southward shift of ITCZ contributes to the southward shift of ENPJ through a kinematic connection bridged by local Hadley circulation.",
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Southward displacement of the upper atmosphere zonal jet in the eastern north Pacific due to global warming. / Park, Jae Heung; An, Soon Il.

In: Geophysical Research Letters, Vol. 41, No. 22, 28.11.2014, p. 7861-7867.

Research output: Contribution to journalArticle

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