Coupled Anisotropic Shear-wave Ray Tracing in Situations where Associated Slowness Sheets Are Almost Tangent

2002 ◽  
pp. 1403-1417
Author(s):  
P. M. Bakker
Keyword(s):  
Ray Tracing ◽  
Shear Wave ◽  
Wave Ray

Quasi‐shear wave ray tracing by wavefront construction in 3‐D, anisotropic media

2004 ◽  
Author(s):  
Hung‐Liang Lai ◽  
Richard L. Gibson ◽  
Kyoung‐Jin Lee
Keyword(s):  
Ray Tracing ◽  
Shear Wave ◽  
Anisotropic Media ◽  
Wave Ray

Quasi-shear wave ray tracing by wavefront construction in 3-D, anisotropic media

2009 ◽  
Vol 69 (2) ◽  
pp. 82-95 ◽  
Author(s):  
Hung-Liang Lai ◽  
Richard L. Gibson ◽  
Kyoung-Jin Lee
Keyword(s):  
Ray Tracing ◽  
Shear Wave ◽  
Anisotropic Media ◽  
Wave Ray

scholarly journals Rossby Wave Ray Tracing in a Barotropic Divergent Atmosphere

2008 ◽  
Vol 65 (5) ◽  
pp. 1679-1691 ◽  
Author(s):  
Chungu Lu ◽  
John P. Boyd
Keyword(s):  
Wave Propagation ◽  
Ray Tracing ◽  
Rossby Wave ◽  
Level Structure ◽  
Low Frequency ◽  
Present Theory ◽  
Wave Ray ◽  
Divergent Wind ◽  
Rossby Wave Propagation ◽  
Upper Level

Abstract The effects of divergence on low-frequency Rossby wave propagation are examined by using the two-dimensional Wentzel–Kramers–Brillouin (WKB) method and ray tracing in the framework of a linear barotropic dynamic system. The WKB analysis shows that the divergent wind decreases Rossby wave frequency (for wave propagation northward in the Northern Hemisphere). Ray tracing shows that the divergent wind increases the zonal group velocity and thus accelerates the zonal propagation of Rossby waves. It also appears that divergence tends to feed energy into relatively high wavenumber waves, so that these waves can propagate farther downstream. The present theory also provides an estimate of a phase angle between the vorticity and divergence centers. In a fully developed Rossby wave, vorticity and divergence display a π/2 phase difference, which is consistent with the observed upper-level structure of a mature extratropical cyclone. It is shown that these theoretical results compare well with observations.

Improving the Accuracy of Millimeter-Wave Ray-Tracing Simulations by Modeling Roadside Trees

2019 ◽  
Vol 18 (1) ◽  
pp. 162-166 ◽  
Author(s):  
Jung-Yong Lee ◽  
Jae-Hyun Lee ◽  
Seong-Cheol Kim
Keyword(s):  
Ray Tracing ◽  
Millimeter Wave ◽  
Wave Ray

Ion absorption effects in high-harmonic fast wave ray tracing theory

1999 ◽  
Author(s):  
J. E. Menard ◽  
C. K. Phillips ◽  
T. K. Mau
Keyword(s):  
Ray Tracing ◽  
High Harmonic ◽  
Fast Wave ◽  
Ion Absorption ◽  
Wave Ray

scholarly journals Intraseasonal and Seasonal-to-Interannual Indian Ocean Convection and Hemispheric Teleconnections

2013 ◽  
Vol 26 (22) ◽  
pp. 8850-8867 ◽  
Author(s):  
Andrew Hoell ◽  
Mathew Barlow ◽  
Roop Saini
Keyword(s):  
Indian Ocean ◽  
Ray Tracing ◽  
Northern Hemisphere ◽  
Southern Oscillation ◽  
Longwave Radiation ◽  
Teleconnection Pattern ◽  
Western Pacific ◽  
Wave Ray ◽  
The Indian Ocean ◽  
Ocean Convection

Abstract Deep tropical convection over the Indian Ocean leads to intense diabatic heating, a main driver of the climate system. The Northern Hemisphere circulation and precipitation associated with intraseasonal and seasonal-to-interannual components of the leading pattern of Indian Ocean convection are investigated for November–April 1979–2008. The leading pattern of Indian Ocean convection is separated into intraseasonal and seasonal-to-interannual components by filtering an index of outgoing longwave radiation at 33–105 days and greater than 105 days, yielding Madden–Julian oscillation (MJO)- and El Niño–Southern Oscillation (ENSO)-influenced patterns, respectively. Observations and barotropic Rossby wave ray tracing experiments suggest that Indian Ocean convection can influence the ENSO-related hemispheric teleconnection pattern in addition to the regional Asian teleconnection. Equivalent barotropic circulation anomalies throughout the Northern Hemisphere subtropics are associated with both seasonal-to-interannual Indian Ocean convection and ENSO. The hemispheric teleconnection associated with seasonal-to-interannual Indian Ocean convection is investigated with ray tracing, which suggests that forcing over the Indian Ocean can propagate eastward across the hemisphere and back to Asia. The relationship between the seasonal-to-interannual component of Indian Ocean convection and ENSO is investigated in terms of a gradient in sea surface temperatures (SST) over the equatorial western Pacific Ocean. When the western Pacific SST gradient is strong during ENSO, strong Maritime Continent precipitation extends further westward into the Indian Ocean, which is accompanied by enhanced tropospheric Asian circulation, similar to the seasonal-to-interannual component of Indian Ocean convection. Analysis of the three strongest interannual convection seasons shows that the strong Indian Ocean pattern of ENSO can dominate individual seasons.

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