A seismic refraction study of cretaceous oceanic lithosphere in the Northwest Pacific Basin

1989 ◽  
Vol 11 (4) ◽  
pp. 239-261 ◽  
Author(s):  
Michel B�e ◽  
L. Dale Bibee
Keyword(s):  
Seismic Refraction ◽  
Oceanic Lithosphere ◽  
Northwest Pacific ◽  
Pacific Basin ◽  
Northwest Pacific Basin

Seismic-refraction measurements in the Northwest Pacific Basin

1969 ◽  
Vol 74 (6) ◽  
pp. 1421-1434 ◽  
Author(s):  
N. Den ◽  
W. J. Ludwig ◽  
S. Murauchi ◽  
J. I. Ewing ◽  
H. Hotta ◽  
...  
Keyword(s):  
Seismic Refraction ◽  
Northwest Pacific ◽  
Pacific Basin ◽  
Northwest Pacific Basin

scholarly journals Topographic Rossby Waves at Two Different Periods in the Northwest Pacific Basin

2020 ◽  
Vol 50 (11) ◽  
pp. 3123-3139
Author(s):  
Masatoshi Miyamoto ◽  
Eitarou Oka ◽  
Daigo Yanagimoto ◽  
Shinzou Fujio ◽  
Maki Nagasawa ◽  
...  
Keyword(s):  
Rossby Waves ◽  
Northwest Pacific ◽  
Pacific Basin ◽  
Observation Data ◽  
Phase Lag ◽  
Two Dimensional ◽  
Energy Propagation ◽  
Single Plane ◽  
Topographic Rossby Waves ◽  
Northwest Pacific Basin

AbstractTo clarify characteristics and mechanisms of mesoscale variability in the deep ocean, we conducted a two-dimensional observation with a 3 × 3 grid mooring array around site R (30°N, 147°E) during 2014–16. We analyze the obtained velocity data together with past mooring observation data in the northwest Pacific basin and outputs of an ocean general circulation model (OGCM). In our two-dimensional mooring observations, the variability of zonal and meridional velocities at a depth of 4000 m was prominent at periods of 174 and 58 days, respectively. The variability at periods of 174 and 58 days propagated to the northwest and west-southwest, respectively, as a single plane wave. The variability at the period of 58 days was considered to be topographic Rossby waves (TRWs) under stratification originated in the Kuroshio Extension region north of site R, as demonstrated by our previous study. At the period of 174 days, zonal and meridional wavenumbers estimated from the phase lag for zonal velocities also satisfied the dispersion relation of TRWs under stratification. Backward ray tracing from site R indicated that energy of TRWs propagated from the eastern slope of the Shatsky Rise to site R almost along f/H contours, where f is the Coriolis parameter and H is water depth. The orientation of major axis of variance ellipses at periods of 174 days and longer, obtained from the past mooring observations and the OGCM outputs, tended to be parallel to f/H contours, being consistent with the direction of energy propagation of TRWs.

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