Decadal-scale teleconnection between South Atlantic SST and southeast Australia surface air temperature in austral summer

• DOI: 10.1007/s00382-017-3764-0
• Publication Date: 2017-06-16T11:45:21Z
• Authors: Jiaqing Xue; Jianping Li; Cheng Sun; Sen Zhao; Jiangyu Mao; Di Dong; Yanjie Li; Juan Feng
• Keywords: Teleconnection; Anticyclone; Forcing (mathematics); Barotropic fluid

Austral summer (December–February) surface air temperature over southeast Australia (SEA) is found to be remotely influenced by sea (SST) in the South Atlantic at decadal time scales. In austral summer, warm SST anomalies southwest induce concurrent above-normal SEA. This decadal-scale teleconnection occurs through eastward propagating Atlantic–Australia (SAA) wave train triggered Atlantic. The excitation of SAA verified forcing experiments based on both linear barotropic and baroclinic models, propagation pathway spatial scale observed are further explained Rossby ray tracing analysis non-uniform basic flow. forced warming characterized an anomalous anticyclone off eastern coast Australia. Temperature diagnostic analyses thermodynamic equation suggest northerly flows western flank this can low-level advection anomaly SEA, which thus lead there. Finally, SST-forced atmospheric general circulation model ensemble also demonstrate that associated with then modulate SEA timescales. Hence, observations combined numerical simulations consistently between summertime