Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.a11b0088c&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #A11B-0088
Physics
1620 Climate Dynamics (3309), 3319 General Circulation, 3339 Ocean/Atmosphere Interactions (0312, 4504), 3362 Stratosphere/Troposphere Interactions
Scientific paper
Using monthly NCEP-NCAR reanalysis data from 1958 to 1998 two interannual oscillations in the eddy forcing (EP fux divergence) due to planetary waves (zonal wave numbers 1-3) were found in the Northern Hemisphere winter, one in the polar upper stratosphere (SIO) and one in the midlatitude troposphere (TIO). The index time series SIO and TIO are statistically independent. Planetary waves are bent equatorward (poleward) in the troposphere during a positive (negative) TIO phase, and in the mid- and upper stratosphere during a positive (negative) SIO phase. The upward propagation of planetary waves into the polar wave guide across the tropopause is closely related to the anomalous meridional wave propagation in the troposphere. However, the anomalous meridional wave propagation in the mid- and upper stratosphere is independent of the tropospheric wave activity. Regression and correlation analysis between zonal mean wind and planetary wave forcing suggest that the TIO is closely related to a Northern Annular Mode, while SIO is not. The TIO index is significantly correlated to midlatitude sea surface temperatures (SST) without any time lag on a monthly to interannual time scale. The significant correlation of SIO with tropical SST (basically with an El Nino pattern), however, reveals that tropical SST is leading the SIO by up to 9 months. Our results suggest that the TIO and the NAM are integral parts of an internal atmospheric mode. They may exert strong impact on the mid-latitude SST in the winter, whereas the SIO is significantly influenced by the ENSO.
Chen Wei
Graf H.
Takahashi Minoru
No associations
LandOfFree
Observed Interannual Oscillations of Planetary wave Forcing in the Northern Hemisphere Winter does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Observed Interannual Oscillations of Planetary wave Forcing in the Northern Hemisphere Winter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Observed Interannual Oscillations of Planetary wave Forcing in the Northern Hemisphere Winter will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1891678