Meteorology and Atmospheric Physics

, Volume 105, Issue 1, pp 55–67

Signature of the Antarctic oscillation in the northern hemisphere

Original Paper

DOI: 10.1007/s00703-009-0036-5

Cite this article as:
Song, J., Zhou, W., Li, C. et al. Meteorol Atmos Phys (2009) 105: 55. doi:10.1007/s00703-009-0036-5


Using the ECWMF daily reanalysis data, this paper investigates signatures of the Antarctic Oscillation (AAO) in the upper troposphere of the northern hemisphere. It is found that during boreal winter, a positive (negative) phase of the AAO is associated with anomalous easterlies (westerlies) in middle-low latitudes (~30–40°N) and anomalous westerlies (easterlies) in middle-high latitudes (~45–65°N) of the upper troposphere about 25–40 days later. While there is also a response in zonal wind in the tropics, namely over the central-eastern Pacific, to some extent, these tropical zonal wind anomalies can trigger a Pacific/North American teleconnection patterns (PNA)-like quasi-stationary Rossby waves that propagate into the Northern Hemisphere and gradually evolve into patterns which resemble North Atlantic teleconnection patterns. Furthermore, these quasi-stationary Rossby waves might give rise to anomalous eddy momentum flux convergence and divergence to accelerate anomalous zonal winds in the Northern Hemisphere.

Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  1. 1.LASG, Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina
  2. 2.Guy Carpenter Asia-Pacific Climate Impact Centre, CityU-IAP Laboratory for Atmospheric SciencesCity University of Hong KongHong KongChina
  3. 3.Graduate School of the Chinese Academy of SciencesBeijingChina
  4. 4.National Climate Centre, Bureau of MeteorologyMelbourneAustralia