Redirigiendo al acceso original de articulo en 18 segundos...
ARTÍCULO
TITULO

Modulation of Atmospheric Nonisothermality and Wind Shears on the Propagation of Seismic Tsunami-Excited Gravity Waves

John Z. G. Ma    

Resumen

We study the modulation of atmospheric nonisothermality and wind shears on the propagation of seismic tsunami-excited gravity waves by virtue of the vertical wavenumber, m (with its imaginary and real parts, ???? m i and ???? m r , respectively), within a correlated characteristic range of tsunami wave periods in tens of minutes. A generalized dispersion relation of inertio-acoustic-gravity (IAG) waves is obtained by relaxing constraints on Hines? idealized locally-isothermal, shear-free and rotation-free model to accommodate a realistic atmosphere featured by altitude-dependent nonisothermality (up to 100 K/km) and wind shears (up to 100 m/s per km). The obtained solutions recover all of the known wave modes below the 200-km altitude where dissipative terms are assumed negligible. Results include: (1) nonisothermality and wind shears divide the atmosphere into a sandwich-like structure of five layers within the 200-km altitude in view of the wave growth in amplitudes: Layer I (0?18) km, Layer II (18?87) km, Layer III (87?125) km, Layer IV (125?175) km and Layer V (175?200) km; (2) in Layers I, III and V, the magnitude of ???? m i is smaller than Hines? imaginary vertical wavenumber (?????? m i H ), referring to an attenuated growth in the amplitudes of upward propagating waves; on the contrary, in Layers II and IV, the magnitude of ???? m i is larger than that of ?????? m i H , providing a pumped growth from Hines? model; (3) nonisothermality and wind shears enhance ???? m r substantially at an ~100-km altitude for a tsunami wave period ?????? T t s longer than 30 min. While Hines? model provides that the maximal value of ??2?? m r 2 is ~0.05 (1/km2 2 ), this magnitude is doubled by the nonisothermal effect and quadrupled by the joint nonisothermal and wind shear effect. The modulations are weaker at altitudes outside 80?140-km heights; (4) nonisothermality and wind shears expand the definition of the observation-defined ?damping factor?, ß: relative to Hines? classical wave growth with ??=0 ß = 0 , waves are ?damped? from Hines? result if ??>0 ß > 0 and ?pumped? if ??<0 ß < 0 . The polarization of ß is determined by the angle ? between the wind velocity and wave vector.

 Artículos similares

       
 
Ma Veronica Holganza, Adonis Rivie, Kevin Martus and Jaishri Menon    
Atmospheric pressure plasma has found wide clinical applications including wound healing, tissue regeneration, sterilization, and cancer treatment. Here, we have investigated its effect on developmental processes like metamorphosis and tail regeneration ... ver más
Revista: Applied Sciences

 
Andrita Ceriana Eska     Pág. 386 - 394
This paper focused at communication systems when train moved. The communication propagation was influenced by building environment. The communication condition that used uplink direction. Mobile station was placed inside the train where moved with 500 km... ver más

 
IGNACIO GALINDO,S. CASTRO,M. VALDÉS    
Global solar irradiance is determined for Mexico from GOES satellite data using, the statistical method of Tarpley (1979). Seven daily digital images taken from GOES satellite over Mexico for the period July 1982 - December 1984 are analysed. Monthly ... ver más
Revista: Atmósfera