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:10.1038/s41598-024-59812-y

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

Sci Rep. 2024 Apr 30;14(1):9872. doi: 10.1038/s41598-024-59812-y.

Authors

Yong-Han Lee¹, Sang-Wook Yeh², Jeong-Hun Kim^{3

4}, Maeng-Ki Kim^{3

5}

Affiliations

¹ Department of Marine Science and Convergent Engineering, Hanyang University, Ansan, 15588, South Korea.
² Department of Marine Science and Convergent Engineering, Hanyang University, Ansan, 15588, South Korea. swyeh@hanyang.ac.kr.
³ Department of Atmospheric Sciences, Kongju National University, Gongju, 32588, South Korea.
⁴ Earth Environment Research Center, Kongju National University, Gongju, 32588, South Korea.
⁵ Particle Pollution Research and Management Center, Kongju National University, Gongju, 32588, South Korea.

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.

Keywords: Atmospheric teleconnection; East Asia’s extreme hot day; Linear baroclinic model; North Atlantic Tripole-like.

Abstract

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