Qualifying Contributions of Teleconnection Patterns to Extremely Hot Summers in Japan

Extremely hot days in Japan are known to persist for a week or more, and they measured by the temperature anomaly at 850 hPa averaged over derived from JRA-55 reanalysis data, denoted as T850JP. Severe high-temperature anomalies often accompanied multiple teleconnection patterns that affect weather Japan, but their relative contribution individual heat wave events has not yet been quantified. In this study, we examined effects of three major patterns, namely, Pacific-Japan (PJ), circumglobal (CGT), Siberian on T850JP July August 1958–2019 using daily low-pass-filtered with 8 cutoff timescale reanalysis.