2003 vs 2002: A large amplitude wintertime temperature anomaly reversion event and its anomalous atmospheric circulation
WANG Huijun NZC/LASG, Institute of Atmlspheric Physics, Chinese Academy of Sciences, Beijing 100029. China
It is revealed that there happened a large am- plitude wintertime temperature anomaly reversion event (LTAR) in Northern Hemisphere high latitude regions and South Australia for the year 2003 versus 2002, with the most notable change in Eurasia, eastern North America, North Pacific, and South Australia. The accompanying atmospheric general circulation anomalies are analyzed and the dominant changes in the circulation arc found out. The anomalous cyclonic eddies over the north Pacific and the anomalous anticyclonic eddies over North Europe that cooperate each other are mostly linked with the event. Both anomalous eddy systems are connected with the remote teleconnection pat- terns respectively. The research also suggests the existence of a cross-equator teleconnection pattern, namely, the Northern Pacific-Western Pacific-Australia teleconnection pattern (NPWPA). It is not only related to LTAR, but also associated with the temperature transition from cold episode to warm episode in the year 2003 versus 2002 during Decem- ber-January-February.