Journal
CLIMATE DYNAMICS
Volume 38, Issue 1-2, Pages 25-43Publisher
SPRINGER
DOI: 10.1007/s00382-011-1073-6
Keywords
Stratospheric QBO; Tropical Pacific SST; Interdecadal variation; Walker circulation; Tropical deep convection; ERA40 and NCEP/NCAR reanalyses; ENSO
Categories
Funding
- NOAA CVP [NA07OAR4310310]
- NSF [ATM-0830062, ATM-0830068, ATM-0917743]
- NOAA [NA09OAR4310058]
- NASA [NNX09AN50G]
- Div Atmospheric & Geospace Sciences [1139479] Funding Source: National Science Foundation
Ask authors/readers for more resources
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 Nio-Southern Oscillation. The irregularity of the QBO may play a secondary role in the interdecadal variation of the association.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available