Antarctic Circumpolar Wave
The Antarctic Circumpolar Wave is a coupled
ocean/atmosphere wavethat circles the Southern Oceanin approximately eight years. Since it is a wave-2 phenomenon (there are two peaks and two troughs in a latitude circle) at each fixed point in space a signal with a period of four years is seen. The wave moves eastward with the prevailing currents.
Note that although the "wave" is seen in
temperature, atmospheric pressure, sea iceand ocean height, the variations are hard to see in the raw data and need to be filtered to become apparent. Because the reliable record for the Southern Ocean is short (since the early 1980s) and signal processingis needed to reveal its existence, some climatologists doubt the existence of the wave. Others admit its existence but say that it varies in strength over decades.
The wave was discovered simultaneously by
Warren Whiteand R G Peterson; and Jacobs and Mitchell; in 1996. Since then, ideas about the wave structure and maintenance mechanisms have changed and grown: by some accounts it is now to be considered as part of a global ENSOwave.
* [http://www-das.uwyo.edu/~geerts/cwx/notes/chap11/ant_wave.html Antarctic Circumpolar Wave Description]
* [http://ams.allenpress.com/amsonline/?request=get-abstract&issn=1520-0485&volume=028&issue=12&page=2345 The Antarctic Circumpolar Wave: A Beta Effect in Ocean–Atmosphere Coupling over the Southern Ocean]
* White, W.B. and R.G. Peterson, 1996. An Antarctic circumpolar wave in surface pressure, temperature and sea-ice extent. Nature 380, 699-702.
* Jacobs, G. A., and J. L. Mitchell, Ocean circulation variations associated with the Antarctic Circumpolar Wave. Geophys. Res. Let., Vol. 23, No. 21, pp. 2947-2950, 1996 [http://www.pol.ac.uk/psmsl/gb/gb3/jacobs.html]
* Connolley, W. M., 2002. Long-term variation of the Antarctic Circumpolar Wave, JGR. doi:10.1029/2000JC000380.
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