Physics
Scientific paper
Feb 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3404809c&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 4, CiteID L04809
Physics
19
Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513), Atmospheric Processes: Middle Atmosphere Dynamics (0341, 0342), Atmospheric Processes: Ocean/Atmosphere Interactions (0312, 4504), Atmospheric Processes: Polar Meteorology, Atmospheric Processes: Stratosphere/Troposphere Interactions
Scientific paper
Applying Linear Discriminant Analysis on 47 years of NCEP stratospheric temperature data from 1959 to 2005, we find that the warm-ENSO (``El Niño'') years are significantly warmer also in the stratosphere at the Northern Hemisphere polar and midlatitudes than the cold-ENSO (``La Niña'') years, during winter. Specifically, the zonal mean, December-February mean, 10-50 hPa mean temperature, when projected onto the coherent spatial structure that best distinguishes the two ENSO groups, classified according to the equatorial Pacific-ocean Cold Tongue Index, is 4°K warmer in the polar stratosphere in the warm-ENSO mean than in the cold-ENSO mean. The difference is statistically significant at above the 95% confidence level. This is the first time statistical significance has been established for ENSO's influence on the polar stratosphere. A surprising result is that the ENSO perturbation to the polar stratosphere is comparable in magnitude to the better-known QBO perturbation, which is 3.8°K between easterly QBO mean and the westerly QBO mean.
Camp Charles D.
Tung Ka-Kit
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