Statistics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.a43e..05s&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #A43E-05
Statistics
1620 Climate Dynamics (0429, 3309), 3255 Spectral Analysis (3205, 3280), 3319 General Circulation (1223), 3334 Middle Atmosphere Dynamics (0341, 0342), 3389 Tides And Planetary Waves
Scientific paper
Modeling studies have predicted a plethora of dynamical trends in the middle atmosphere associated with anthropogenic forcing. Phenomena such as jet shifts, intensified westerlies and evolving annular modes have not manifested themselves in the zonal mean circulation recorded during the satellite era. Largely this may be attributed to the magnitude of inter-annual variability and the brevity of the available record. In this study of the NCEP-NCAR reanalysis record, dramatic trends consistent with theory and modeling predictions are presented. More robust statistics are achieved by employing Kelvin's circulation theorem to compute circulation on isentropic surfaces as a function of PV-equivalent latitude, a quasi-conservative coordinate system. Inter-hemispheric asymmetries underscore the differences in planetary wave forcing and a new measure of finite wave amplitude is introduced to quantify them.
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