Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.1731m&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 9, p. 1731-1734
Physics
13
Global Change: Climate Dynamics
Scientific paper
An analysis of observed data shows that the tropospheric biennial oscillation (TBO, with roughly a 2-3 year period) encompasses most ENSO years (with their well-known biennial tendency) as well as additional years that contribute to biennial transitions in the Indian monsoon. Three conditions (related to anomalous surface temperatures) postulated to contribute to TBO transitions are examined for the northern spring season before the Indian monsoon: 1) anomalous tropical Pacific SSTs, 2) atmospheric circulation-related anomalous south Asian land temperatures and resulting meridional temperature gradients, and 3) anomalous SSTs in the Indian Ocean. We quantify these three interannual transition conditions on a year by year basis, thus taking into account intermittent influences and secular variations in the strength of any particular linkage in any given year. The more transition conditions that are included in the analysis, the greater the TBO amplitude in terms of spectral power in the TBO periods of 2-3 years.
Arblaster Julie M.
Meehl Gerald A.
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