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

Zhiwei Zhu (), Rui Lu, Bin Yu, Tim Li and Sang-Wook Yeh
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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
Sang-Wook Yeh: Hanyang University

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-53056-0

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