Vorticity Waves in the Tropical Latitudes

Tropical cyclogenesis in tropical waves

The development of tropical depressions within tropical waves over the Atlantic and eastern Pacific is usually preceded by a " surface low along the wave " as if to suggest a hybrid wave-vortex structure in which flow streamlines not only undulate with the waves, but form a closed circulation in the lower troposphere surrounding the low. This 5 structure, equatorward of the easterly jet axis, r...

low-vorticity waves in deep water

NOTES AND CORRESPONDENCE Potential Vorticity, Easterly Waves, and Eastern Pacific Tropical Cyclogenesis

A significant sign reversal in the meridional potential vorticity gradient was found during the summer of 1991 on the 310-K isentropic surface (near 700 mb) over the Caribbean Sea. The Charney–Stern necessary condition for instability of the mean flow is met in this region. It is speculated that the sign reversal permits either invigoration of African waves or actual generation of easterly wave...

Convective gravity waves at mid-latitudes

Wind-profiler observations of gravity waves produced by convection at mid-latitudes Y. G. Choi, S. C. Lee, A. J. McDonald, and D. A. Hooper Geophysical Prospecting Laboratory, Seoul National University, Korea Department of Physics, Kangnung National University, Korea Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch, New Zealand Rutherford Appleton La...

Humans at tropical latitudes produce more females.

Skews in the human sex ratio at birth have captivated scientists for over a century. The accepted average human natal sex ratio is slightly male biased, at 106 males per 100 females or 51.5 per cent males. Studies conducted on a localized scale show that sex ratios deviate from this average in response to a staggering number of social, economical and physiological variables. However, these patt...