The application to main-sequence stars of the rotation-induced mixing theory in the presence of μ-gradients leads to partial mixing in the lithium destruction region, not visible in the atmosphere. The induced lithium depletion becomes visible in the sub-giant phase as soon as the convective zone deepens enough. This may explain why the observed “ lithium dilution ” is smoother and the final di...

Climate model results suggest that future climate change in Antarctica will be accompanied by continued strengthening and poleward contraction of the Southern Ocean westerly wind belt. Paleoclimate records suggest past changes in the westerly winds can be abrupt and that healing of the Antarctic ozone hole could lead to poleward contraction of the westerlies and increased meridional atmospheric...

Wave solutions to the linearized, quasi-hydrostatic equations for adiabatic, nonviscous flow on an equatorially oriented beta plane are obtained. The basic current is assumed to be zonal and invariant in both space and time. Only solutions for which the meridional wind component is symmetric with respect to the equator are considered. Disturbances with wavelengths on the order of 103 km. are fo...

This study examines the dynamic feedbacks generated from synoptic eddies that contribute to maintenance and propagation of intraseasonal North Atlantic Oscillation (ISNAO) which has significant 20?60-day variability features clearly westward slightly northward propagations. The ISNAO-related eddy-vorticity fluxes induced forcing positive in-phase feedback upstream ISNAO. Due accumulated shearin...

Using the representative statistics on traveling ionospheric disturbances (TIDs) obtained by Yekaterinburg and Magadan radars, we have shown that distributions of TIDs average TID velocities azimuths local time agree well with hypothesis internal gravity wave (IGW) filtering neutral wind. We examined influence significant winter sudden stratospheric warmings IGW in ionosphere. A method has been...

The climate of the stratosphere is known to be subject to long-term changes induced by anthropogenic emissions of long-lived greenhouse gases (GHGs) as well as by emissions of ozone depleting substances (primarily chlorofluorocarbons, CFCs). Enhanced concentrations of CFCs have led to strong ozone depletion over the last decades. Thanks to the Montreal Protocol and its amendments and adjustment...

Based on velocity data from a long-term moored observatory located at 0°N, 23°W we present evidence of vertical asymmetry during the intraseasonal maxima northward and southward upper-ocean flow in equatorial Atlantic Ocean. Periods are characterized by meridional maximum close to surface, while phases show subsurface about 40 m. We that observed is caused local winds. Southerly wind stress equ...

The results of a series of numerical experiments which were intended to simulate the warming and d e v e b p i n g stages of hurricane formation are discussed. I n the cxperiments, an initially weak cyclone develops into an intense vortex. However, the deepening proceeds too rapidly and meridional circulations which are too inteiisc develop. The inclusion of ground friction and vertical mixing ...

in this paper it is attempted to investigate the behavior of an inviscid flow in the meridional plane of an axial flow compressor. for this purpose the 3-d unsteady euler equations in cylindrical coordinate are averaged in tangential direction. therefore, the equations are reduced to a 2-d system. by averaging the tangential component of momentum equation, a blade force will result. axial and r...

North Atlantic (NA) deep-water formation and the resulting Atlantic meridional overturning cell is generally regarded as the primary feature of the global overturning circulation and is believed to be a result of the geometry of the continents. Here, instead, the overturning is viewed as a global energy–driven system and the robustness of NA dominance is investigated within this framework. Usin...