Enhanced warming and intensification of the Kuroshio Extension, 1999-2013

You Lin Wang, Chau Ron Wu

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The Pacific climate regime has anomalous warm and cool periods every decade associated with atmospheric circulation changes, which are known to have modulated the tropical and subtropical Pacific during the recent Pacific hiatus regime (1999-2013). However, the influence of the hiatus regime on the Kuroshio Extension (KE) remains unclear. Here, we show that the KE jet underwent enhanced warming (increased 1-1.5 °C), intensification (8-19%) and northward migration (0.5-1°). The KE jet became more perturbed in the upstream region (increased by 70%, west of 146°E) but became stable downstream (perturbation decreased 5-11%, east of 146°E). A poleward shift of the mid-latitude jet stream and weakened Aleutian Low (AL) contributed to the northward migration and intensification of the KE jet, respectively. The weakened AL was associated with negative wind stress curl (WSC) in the eastern Pacific, and this WSC generated an underlying positive sea surface height anomaly that propagated westward, intensifying the KE jet when it reached the KE region. Since the recent Pacific hiatus regime ended after 2013, these changes of the KE jet may reverse during the ongoing warming regime.

Original languageEnglish
Article number101
JournalRemote Sensing
Volume11
Issue number1
DOIs
Publication statusPublished - 2019 Jan 1

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warming
hiatus
wind stress
jet stream
sea surface height
atmospheric circulation
perturbation
anomaly
climate

Keywords

  • Climate change
  • Kuroshio Extension
  • Pacific regime shift

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

Cite this

Enhanced warming and intensification of the Kuroshio Extension, 1999-2013. / Wang, You Lin; Wu, Chau Ron.

In: Remote Sensing, Vol. 11, No. 1, 101, 01.01.2019.

Research output: Contribution to journalArticle

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AB - The Pacific climate regime has anomalous warm and cool periods every decade associated with atmospheric circulation changes, which are known to have modulated the tropical and subtropical Pacific during the recent Pacific hiatus regime (1999-2013). However, the influence of the hiatus regime on the Kuroshio Extension (KE) remains unclear. Here, we show that the KE jet underwent enhanced warming (increased 1-1.5 °C), intensification (8-19%) and northward migration (0.5-1°). The KE jet became more perturbed in the upstream region (increased by 70%, west of 146°E) but became stable downstream (perturbation decreased 5-11%, east of 146°E). A poleward shift of the mid-latitude jet stream and weakened Aleutian Low (AL) contributed to the northward migration and intensification of the KE jet, respectively. The weakened AL was associated with negative wind stress curl (WSC) in the eastern Pacific, and this WSC generated an underlying positive sea surface height anomaly that propagated westward, intensifying the KE jet when it reached the KE region. Since the recent Pacific hiatus regime ended after 2013, these changes of the KE jet may reverse during the ongoing warming regime.

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