Two Types of Heat Wave in Korea Associated With Atmospheric Circulation Pattern

Abstract

This study investigates heat wave variability over Korea during 1979‐2017. It is found that most of heat waves in Korea can be classified into two distinct types based on the spatial patterns of atmospheric circulation anomalies: the zonal wave (Z‐wave) type and the meridional wave (M‐wave) type. The Z‐wave type is accompanied by large‐scale atmospheric waves across the Eurasian continent, while the M‐wave type is associated with convective activities over the subtropical western North Pacific. The Z‐wave type occurs when the high‐pressure node of eastward propagating wave located around Korea and it seems that the associated wave energy could originate from North Atlantic Ocean. The M‐wave type, on the other hand, is driven by northward propagating wave train from subtropical western North Pacific to East Asia, which is triggered by anomalous convective activity over the subtropical western North Pacific. By analyzing thermodynamical as well as dynamical variables, detailed descriptions on the physical characteristics of two types of heat wave are presented in this study along with the possible implications for summer climate variability over Korea.

Performance Evaluation of CMIP5 and CMIP6 Models on Heatwaves in Korea and Associated Teleconnection Patterns

“…The two figures indicate that the upward movement enhanced by the strong convection activity in the Northwest Pacific induces downward movement in East Asia through the north‐south teleconnection, resulting in a high‐pressure anomaly favorable for heatwaves in Korea. The convective activity near the South China Sea and the Philippine Sea (black box in Figures 1b and 2b) is specifically important in terms of the interannual variabilities in TMAX and NHD, which is consistent with the Pacific‐Japan (PJ) teleconnection (Nitta, 1987) and previous studies (Kim et al, 2019, 2020; Kosaka & Nakamura, 2006; Lee & Lee, 2016; Yeh et al, 2018; Yeo et al, 2019), indicating that the OLR over the region can be one of diagnostic indices explaining heatwaves in Korea.…”

“…1b and Fig. 2b) is specifically important in terms of the interannual variabilities in TMAX and NHD, which is consistent with the Pacific-Japan (PJ) teleconnection (Nitta, 1987) and previous studies (Kosaka and Nakamura, 2006;Lee & Lee, 2016;Yeh et al, 2018;Yeo et al, 2019;Kim et al, 2019;Kim et al, 2020), indicating that the OLR over the region can be one of diagnostic indices explaining heatwaves in Korea Notably, another strong convective activity related to heatwaves in Korea is located over northwestern India ( Fig. 1b and Fig.…”

“…Journal of Geophysical Research: Atmospheres the results of previous studies Yeo et al, 2019) and Figures 1a and 2a. HWCI means that the greater the positive value is, the stronger the north-south teleconnection is.…”

Predictability of the mid‐summer surface air temperature over the Yangtze River valley in the National Centers for Environmental Prediction Climate Forecast System

“…Meanwhile, as the dominant teleconnection pattern in boreal summer over the Northern Hemisphere, the positive centres of the circumglobal teleconnection (CGT) are located over East Asia, the North Pacific, North America, the North Atlantic and West Europe (Ding and Wang, 2005). The CGT also exerts a significant impact on regulating SAT in the mid‐latitudes of the Northern Hemisphere through tropical‐extratropical interactions (Ding et al ., 2011; Teng and Branstator, 2017; Yeo et al ., 2019). In particular, CGT in the positive phase induces the northwestward expansion of the WPSH and results in the positive SAT anomalies over Central China (i.e., YRV) (Lin, 2014; Qiao et al ., 2018).…”

Potential impact of atmospheric heating over East Europe on the zonal shift in the South Asian high: the role of the Silk Road teleconnection

“…The establishment of the SAH and the associated meridional movement of the ridgeline have close relationships with the onset of the Asian summer monsoon [3][4][5] and location of rain belt over East China 6,7 . Changes in the SAH have notable impacts on the weather and climate in many regions, such as precipitation over China [8][9][10][11] , India [12][13][14] , and the Korean peninsula [15][16][17][18] . The SAH can also impact precipitation and surface temperature over the North Pacific and North American regions by modulating atmospheric teleconnection patterns 19 .…”