The QBO, gravity waves forced by tropical convection, and ENSO
نویسندگان
چکیده
منابع مشابه
Gravity Waves and Ionospheric Irregularities over Tropical Convection Zones observed by GPS/MET Radio Occultation
GPS/MET observations of the tropical atmosphere of the southern hemisphere (5S to 25S) during February 1997 are analysed, when a high amount of convective tropospheric water vapor is at these latitudes. Enhanced gravity wave activity of the lower stratosphere at h=22-28 km is associated to areas of increased tropospheric water vapor pressure at h=4-6 km, regarded as a measure of tropical convec...
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4 Observational studies suggest that the stratospheric quasi-biennial oscillation (QBO) can 5 modulate tropical deep convection. We use a cloud-resolving model with a limited domain, 6 representing a convective column in the tropics, to study the mechanisms of this modulation. 7 The large-scale circulation is parameterized using the weak temperature gradient (WTG) 8 approximation, under which t...
متن کاملAnalysis of gravity-waves produced by intense tropical cyclones
Conventional and wavelet methods are combined to characterize gravity-waves (GWs) produced by two intense tropical cyclones (TCs) in the upper troposphere and lower stratosphere (UT/LS) from GPS winsonde data. Analyses reveal large contribution of GWs induced by TCs to wave energy densities in the UT/LS. An increase in total energy density of about 30% of the climatological energy density in au...
متن کاملAn Analytical Study of Ozone Feedbacks on Kelvin and Rossby–Gravity Waves: Effects on the QBO
An equatorial beta-plane model of the middle atmosphere is used to analytically examine the effects of radiative cooling and ozone heating on the spatial and temporal evolution of the quasi-biennial oscillation (QBO). Under the assumption that the diabatic heating is weak and the background fields of wind, temperature, and ozone are slowly varying, a perturbation analysis yields expressions des...
متن کاملGravity Waves in Shear and Implications for Organized Convection
It is known that gravity waves in the troposphere, which are often excited by preexisting convection, can favor or suppress the formation of new convection. Here it is shown that, in the presence of wind shear or barotropic wind, the gravity waves can create a more favorable environment on one side of preexisting convection than the other side. Both the nonlinear and linear analytic models deve...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Atmospheres
سال: 2016
ISSN: 2169-897X,2169-8996
DOI: 10.1002/2015jd024125