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Connection of the stratospheric QBO with global atmospheric general circulation and tropical SST. Part II: interdecadal variations.
- Source :
-
Climate Dynamics . Jan2012, Vol. 38 Issue 1/2, p25-43. 19p. - Publication Year :
- 2012
-
Abstract
- The interdecadal variation of the association of the stratospheric quasi-biennial oscillation (QBO) with tropical sea surface temperature (SST) anomalies (SSTA) and with the general circulation in the troposphere and lower stratosphere is examined using the ERA40 and NCEP/NCAR reanalyses, as well as other observation-based analyses. It is found that the relationship between the QBO and tropical SSTA changed once around 1978-1980, and again in 1993-1995. During 1966-1974, negative correlation between the QBO and NINO3.4 indices reached its maximum when the NINO3.4 index lagged the QBO by less than 6 months. Correspondingly, the positive correlations were observed when the NINO3.4 index led the QBO by about 11-13 months or lagged by about 12-18 months. However, maximum negative correlations were shifted from the NINO3.4 index lagging the QBO by about 0-6 months during 1966-1974 to about 3-12 months during 1985-1992. During 1975-1979, both the negative and positive correlations were relatively small and the QBO and ENSO were practically unrelated to each other. The phase-based QBO life cycle composites also confirm that, on average, there are two phase (6-7 months) delay in the evolution of the QBO-associated anomalous Walker circulation, tropical SST, atmospheric stability, and troposphere and lower stratosphere temperature anomalies during 1980-1994 in comparison with those in 1957-1978. The interdecadal variation of the association between the QBO and the troposphere variability may be largely due to the characteristic change of El Niño-Southern Oscillation. The irregularity of the QBO may play a secondary role in the interdecadal variation of the association. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09307575
- Volume :
- 38
- Issue :
- 1/2
- Database :
- Academic Search Index
- Journal :
- Climate Dynamics
- Publication Type :
- Academic Journal
- Accession number :
- 70068821
- Full Text :
- https://doi.org/10.1007/s00382-011-1073-6