RT Journal Article
T1 Interannual variability in the gravity wave drag – vertical coupling and possible climate links
A1 Sacha , Petr
A1 Miksovsky, Jiri
A1 Pisoft, Petr
K1 2501 Ciencias de la Atmósfera
AB Gravity wave drag (GWD) is an important driver of the middleatmospheric dynamics. However, there are almost no observationalconstraints on its strength and distribution (especiallyhorizontal). In this study we analyze orographic GWD (OGWD) outputfrom Canadian Middle Atmosphere Model simulation with specifieddynamics (CMAM-sd) to illustrate the interannual variability in theOGWD distribution at particular pressure levels in the stratosphereand its relation to major climate oscillations. We have foundsignificant changes in the OGWD distribution and strength dependingon the phase of the North Atlantic Oscillation (NAO), quasi-biennialoscillation (QBO) and El Niño–Southern Oscillation. TheOGWD variability is shown to be induced by lower-tropospheric windvariations to a large extent, and there is also significantvariability detected in near-surface momentum fluxes. We arguethat the orographic gravity waves (OGWs) and gravity waves (GWs) in general can bea quick mediator of the tropospheric variability into thestratosphere as the modifications of the OGWD distribution canresult in different impacts on the stratospheric dynamics duringdifferent phases of the studied climate oscillations.
PB Earth System Dynamics
SN 21904987
YR 2018
FD 2018-05-24
LK http://hdl.handle.net/11093/4286
UL http://hdl.handle.net/11093/4286
LA eng
NO Earth System Dynamics, 9(2): 647-661 (2018)
NO Grantová Agentura České Republiky | Ref. 16-01562J
DS Investigo
RD 15-sep-2024