Interdecadal Variations in the Frequency of Persistent Hot Events in Boreal Summer over Midlatitude Eurasia

• DOI: 10.1175/jcli-d-18-0706.1
• Publication Date: 2019-05-23T16:55:50Z
• Authors: Ning Shi; Yicheng Wang; Xiaoqiong Wang; Pinyu Tian
• Keywords: Middle latitudes; Atmospheric Circulation; Anomaly (physics); Annual cycle

ABSTRACT Based on the daily Japanese 55-year Reanalysis (JRA-55) dataset, this study reveals that southern Europe/western Asia (SEWA) and northern China are two large-scale regions have exhibited consistent interdecadal variations in frequency of persistent hot events (PHEs). Over past 58 summers, period approximately from 1973 to 1996 represents an inactive for occurrence PHEs over regions, whereas antecedent subsequent periods active periods. At subseasonal time scale, regional SEWA characterized by quasi-stationary wave train anomalies aloft northwest Atlantic Europe, while Eurasian continent. The persistence is associated with Rossby propagation. Moreover, energy extraction basic flow also favorable their persistence. Our above typical circulation both phase background changes during Thus, can modulate simultaneously. Further analysis closely related variation Silk Road pattern based similarities spatial temporal variation. sea surface temperature four particular seems facilitate shifts scale.