Scientific Reports (Apr 2024)

The role of the North Atlantic Ocean on the increase in East Asia’s spring extreme hot day occurrences across the early 2000s

  • Yong-Han Lee,
  • Sang-Wook Yeh,
  • Jeong-Hun Kim,
  • Maeng-Ki Kim

DOI
https://doi.org/10.1038/s41598-024-59812-y
Journal volume & issue
Vol. 14, no. 1
pp. 1 – 11

Abstract

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Abstract The occurrence frequency of East Asia’s extreme hot day in boreal spring has increased since 1979. Using observational data and a Linear baroclinic model experiment, our study suggests that the occurrence of hot day is mainly due to anomalous high pressure over East Asia associated with a horizontal stationary wave train originating from a positive phase of the North Atlantic Tripole (NAT) sea surface temperature (SST) in spring. The effect of a positive phase of the NAT SST is evident in the 2000s, apparently associated with the linear trend of the North Atlantic SST like a positive phase of the NAT SST. Before 2000s, in contrast, SST forcing in the Indian Ocean and eastern tropical Pacific, which is associated with a negative phase of the NAT SST, may contribute to induce the East Asian hot days through atmospheric teleconnections. This implies that the relationship between a positive phase of the NAT SST and the occurrence of hot days in East Asia has been changed during the 2000s.

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