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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Q+J+R+Meteorol+Soc
2017 ; 143
(707
): 2481-2495
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An evaluation of gravity waves and gravity wave sources in the Southern
Hemisphere in a 7 km global climate simulation
#MMPMID29760535
Holt LA
; Alexander MJ
; Coy L
; Liu C
; Molod A
; Putman W
; Pawson S
Q J R Meteorol Soc
2017[Jul]; 143
(707
): 2481-2495
PMID29760535
show ga
In this study, gravity waves (GWs) in the high-resolution GEOS-5 Nature Run are
first evaluated with respect to satellite and other model results. Southern
Hemisphere winter sources of non-orographic GWs in the model are then
investigated by linking measures of tropospheric non-orographic gravity wave
generation tied to precipitation and frontogenesis with absolute gravity wave
momentum flux in the lower stratosphere. Finally, non-orographic GW momentum flux
is compared to orographic gravity wave momentum flux and compared to previous
estimates. The results show that the global patterns in GW amplitude, horizontal
wavelength, and propagation direction are realistic compared to observations.
However, as in other global models, the amplitudes are weaker and horizontal
wavelengths longer than observed. The global patterns in absolute GW momentum
flux also agree well with previous model and observational estimates. The
evaluation of model non-orographic GW sources in the Southern Hemisphere winter
shows that strong intermittent precipitation (greater than 10 mm h(-1)) is
associated with GW momentum flux over the South Pacific, whereas frontogenesis
and less intermittent, lower precipitation rates (less than 10 mm h(-1)) are
associated with GW momentum flux near 60°S. In the model, orographic GWs
contribute almost exclusively to a peak in zonal mean momentum flux between 70
and 75°S, while non-orographic waves dominate at 60°S, and non-orographic GWs
contribute a third to a peak in zonal mean momentum flux between 25 and 30°S.