Interdecadal Variability of the Warm Arctic and Cold Eurasia Pattern and Its North Atlantic Origin

• DOI: 10.1175/jcli-d-17-0562.1
• Publication Date: 2018-03-27T19:06:55Z
• Authors: Mi-Kyung Sung; Seon-Hwa Kim; Baek-Min Kim; Yong-Sang Choi
• Keywords: 13. Climate action; 01 natural sciences; 0105 earth and related environmental sciences

ABSTRACT This study investigates the origin of interdecadal variability in warm Arctic and cold Eurasia (WACE) pattern, which is defined as second empirical orthogonal function surface air temperature (SAT) over Eurasian continent Northern Hemisphere winter, by analyzing Twentieth Century Reanalysis dataset. While previous studies highlight recent enhancement WACE ascribing it to anthropogenic warming, authors found that pattern has experienced a seemingly periodic variation twentieth century. long-term SAT attributable altered coupling between Siberian high (SH) intraseasonal Rossby wave emanating from North Atlantic, local branch interacts with SH consequentially enhances continental perturbation. It further identified these atmospheric circulation changes are largely controlled decadal amplitude modulation climatological stationary waves Atlantic region. The mean condition components brings baroclinicity storm track activity jointly change generation propagation characteristics well. With simple model experiments, confirm how flow acts source for growth leads downstream pattern.