https://repository.kopri.re.kr/handle/201206/5097 Sat, 04 Apr 2026 15:11:19 GMT 2026-04-04T15:11:19Z https://repository.kopri.re.kr/handle/201206/9523 Title: Interdecadal Variability of the Warm Arctic and Cold Eurasia Pattern and Its North Atlantic Origin Authors: Sung, Mi-Kyung; Choi, Yong-Sang; Kim, Baek-Min; Kim, Seon-Hwa Abstract: This study investigates the origin of the interdecadal variability in the Warm Arctic and Cold Eurasia (WACE) pattern, which is defined as the second empirical orthogonal function of surface air temperature (SAT) variability over Eurasian continent in Northern winter, by analyzing the Twentieth Century Reanalysis dataset. While previous studies highlight recent enhancement of the WACE pattern ascribing it to anthropogenic warming, we found that the WACE pattern has experienced a seemingly periodic interdecadal variation over the twentieth century. This long-term variation in the Eurasian SAT is attributable to the altered coupling between the Siberian High (SH) and intraseasonal Rossby wave emanating from the North Atlantic, as the local wave branch interacts with the SH and consequentially enhances the continental temperature perturbation. It is further identified that these atmospheric circulation changes in Eurasia are largely controlled by the decadal amplitude modulation of the climatological stationary waves over the North Atlantic region. The altered decadal mean condition of stationary wave components brings changes in local baroclinicity and storm track activity over the North Atlantic, which jointly change the intraseasonal Rossby wave generation and propagation characteristics as well. With simple stationary wave model experiments, we confirm how the altered mean flow condition in North Atlantic acts as a source for the growth of the Rossby wave that leads to the change in the downstream WACE pattern. Wed, 01 Aug 2018 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/9523 2018-08-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/11103 Title: Dynamics and predictability study of mid-latitude blocking for wintertime seasonal prediction Authors: Kim, Baek-Min Sat, 30 Jun 2018 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/11103 2018-06-30T00:00:00Z https://repository.kopri.re.kr/handle/201206/9522 Title: A key process of the nonstationary relationship between ENSO and the Western Pacific teleconnection pattern Authors: Park, Young-Hyang; Isabelle, Durand; Frederic, Vivier; Yamamoto, Masaru; Pak, Gyundo; Kim, Baek-Min Abstract: Recent studies have discovered an intriguing nonstationary relationship between El Nino？Southern Oscillation (ENSO) and the Western Pacific (WP) teleconnection pattern, one of the most prominent winter atmospheric circulation patterns in the North Pacific, with a regime-dependent interdecadal modulation of significant and insignificant correlations. However, the physical process underlying the observed nonstationary ENSO-WP relationship is a puzzle and remains to be elucidated, which is also essential for clarifying the still-debated nontrivial issue on whether the WP is directly forced by ENSO or by midlatitude storm tracks-driven intrinsic processes. Based on empirical orthogonal function(EOF) analysis of the upper-tropospheric teleconnection patterns and associated Rossby wave sources(RWS), we show that the nonstationarity in question is due to the regime-dependent constructive or destructive interference in meridional overturning circulation between the two leading EOFs of RWS best correlated with ENSO and WP, respectively. The observed insignificant correlation between ENSO and the WP after the 1988 regime shift can be explained by interrupted teleconnection between the tropics and high latitudes due to the collapse of the subtropical bridge pillar in the jet entrance region, consequence of the destructive interference. This suggested interference mechanism related to the regime-dependent upper-level RWS fields has significant implications for resolving the puzzle that hinders better understanding of decadal regime behaviors of the climate system in the North Pacific. Fri, 22 Jun 2018 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/9522 2018-06-22T00:00:00Z https://repository.kopri.re.kr/handle/201206/9621 Title: Interdecadal Variability of the Warm Arctic and Cold Eurasia Pattern and Its North Atlantic Origin Authors: Sung, Mi-Kyung; Choi, Yong-Sang; Kim, Baek-Min; Kim, Seon-Hwa Abstract: This study investigates the origin of the interdecadal variability in the Warm Arctic and Cold Eurasia (WACE) pattern, which is defined as the second empirical orthogonal function of surface air temperature (SAT) variability over Eurasian continent in Northern winter, by analyzing the Twentieth Century Reanalysis dataset. While previous studies highlight recent enhancement of the WACE pattern ascribing it to anthropogenic warming, we found that the WACE pattern has experienced a seemingly periodic interdecadal variation over the twentieth century. This long-term variation in the Eurasian SAT is attributable to the altered coupling between the Siberian High (SH) and intraseasonal Rossby wave emanating from the North Atlantic, as the local wave branch interacts with the SH and consequentially enhances the continental temperature perturbation. It is further identified that these atmospheric circulation changes in Eurasia are largely controlled by the decadal amplitude modulation of the climatological stationary waves over the North Atlantic region. The altered decadal mean condition of stationary wave components brings changes in local baroclinicity and storm track activity over the North Atlantic, which jointly change the intraseasonal Rossby wave generation and propagation characteristics as well. With simple stationary wave model experiments, we confirm how the altered mean flow condition in North Atlantic acts as a source for the growth of the Rossby wave that leads to the change in the downstream WACE pattern. Thu, 01 Feb 2018 00:00:00 GMT https://repository.kopri.re.kr/handle/201206/9621 2018-02-01T00:00:00Z