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A moderator of tropical impacts on climate in Canadian Arctic Archipelago during boreal summer

Author

Listed:
  • Zhiwei Zhu

    (Nanjing University of Information Science and Technology)

  • Rui Lu

    (Nanjing University of Information Science and Technology)

  • Bin Yu

    (Environment and Climate Change Canada)

  • Tim Li

    (Nanjing University of Information Science and Technology
    University of Hawaii)

  • Sang-Wook Yeh

    (Hanyang University)

Abstract

The Canadian Arctic Archipelago consists of important international trade routes, and local surface air temperatures (SAT) greatly control sea ice melting in situ during boreal summer (June-July-August-September). However, the drivers of the Arctic Archipelago summer SAT variability have not yet been fully elucidated. Here, we find that the impact of tropical Indo-Pacific convection on the Arctic Archipelago SAT through induced poleward-propagating Rossby wave train is strongly modulated by Russian Arctic sea surface temperature anomalies (SSTA). Negative Russian Arctic SSTA lead to a weakened East Asia westerly jet via equatorward Rossby wave activity. The weakened westerly jet enhances the meridional gradient of the potential vorticity over the North Pacific, guiding the poleward-propagating Rossby wave to the Arctic Archipelago and therefore affecting the local SAT. Conversely, positive Russian Arctic SSTA impede the northward-propagating Rossby wave via enhancing the East Asia westerly jet, resulting in a weakened relationship between the tropical Indo-Pacific convection and Arctic Archipelago SAT. The present study proposes a mechanism whereby changes in the Tropical-Arctic connection stem from thermal conditions elsewhere in the Arctic, through shaping poleward-propagating Rossby waves by changing the background mean flow.

Suggested Citation

  • Zhiwei Zhu & Rui Lu & Bin Yu & Tim Li & Sang-Wook Yeh, 2024. "A moderator of tropical impacts on climate in Canadian Arctic Archipelago during boreal summer," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-53056-0
    DOI: 10.1038/s41467-024-53056-0
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    References listed on IDEAS

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    1. Qinghua Ding & John M. Wallace & David S. Battisti & Eric J. Steig & Ailie J. E. Gallant & Hyung-Jin Kim & Lei Geng, 2014. "Tropical forcing of the recent rapid Arctic warming in northeastern Canada and Greenland," Nature, Nature, vol. 509(7499), pages 209-212, May.
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