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Physical drivers of the summer 2019 North Pacific marine heatwave

Author

Listed:
  • Dillon J. Amaya

    (University of Colorado Boulder
    University of Colorado Boulder)

  • Arthur J. Miller

    (University of California San Diego)

  • Shang-Ping Xie

    (University of California San Diego)

  • Yu Kosaka

    (The University of Tokyo)

Abstract

Summer 2019 observations show a rapid resurgence of the Blob-like warm sea surface temperature (SST) anomalies that produced devastating marine impacts in the Northeast Pacific during winter 2013/2014. Unlike the original Blob, Blob 2.0 peaked in the summer, a season when little is known about the physical drivers of such events. We show that Blob 2.0 primarily results from a prolonged weakening of the North Pacific High-Pressure System. This reduces surface winds and decreases evaporative cooling and wind-driven upper ocean mixing. Warmer ocean conditions then reduce low-cloud fraction, reinforcing the marine heatwave through a positive low-cloud feedback. Using an atmospheric model forced with observed SSTs, we also find that remote SST forcing from the central equatorial and, surprisingly, the subtropical North Pacific Ocean contribute to the weakened North Pacific High. Our multi-faceted analysis sheds light on the physical drivers governing the intensity and longevity of summertime North Pacific marine heatwaves.

Suggested Citation

  • Dillon J. Amaya & Arthur J. Miller & Shang-Ping Xie & Yu Kosaka, 2020. "Physical drivers of the summer 2019 North Pacific marine heatwave," Nature Communications, Nature, vol. 11(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-15820-w
    DOI: 10.1038/s41467-020-15820-w
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    Cited by:

    1. Dylan G. E. Gomes & James J. Ruzicka & Lisa G. Crozier & David D. Huff & Richard D. Brodeur & Joshua D. Stewart, 2024. "Marine heatwaves disrupt ecosystem structure and function via altered food webs and energy flux," Nature Communications, Nature, vol. 15(1), pages 1-10, December.

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