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COSMIC GPS Observations of Northern Hemisphere winter stratospheric gravity waves and comparisons with an atmospheric general circulation model
Author(s) -
Alexander S. P.,
Tsuda T.,
Kawatani Y.
Publication year - 2008
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2008gl033174
Subject(s) - northern hemisphere , gravity wave , atmospheric sciences , climatology , atmospheric wave , stratosphere , orographic lift , atmospheric circulation , jet stream , cosmic cancer database , environmental science , geology , gravitational wave , jet (fluid) , meteorology , physics , precipitation , astronomy , thermodynamics
COSMIC satellite temperature data are used to derive the 2006/07 winter mean stratospheric Northern Hemisphere potential energy E p from gravity waves with vertical wavelengths less than 7 km in grid cells of size 10° × 5°; and to study longitudinal and latitudinal variability in cells of size 20° × 5° × 7 days. Large E p at 17–23 km is mostly associated with the sub‐tropical jet and shows significant longitudinal variability. Some contribution to total E p from local orographic sources may occur above the Canadian Rockies, Scandinavia and northern Japan, but not above the Himalayas, due to the background wind conditions. Many of the waves are likely to have low ground‐based phase speeds, as observed by filtering around the 0–10 m s −1 background zonal wind. COSMIC results are compared with a T106L60 AGCM, confirming sub‐tropical jet related generation, upward propagation and low phase speeds of the observed gravity waves.