Long-period Waves Over California''s Continental Borderland, Part I., Background Spectra
Long-period Waves Over California''s Continental Borderland, Part I., Background Spectra
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DOI：
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发表时间：
1962
期刊：
影响因子：
3
通讯作者：
F. Snodgrass;W. Munk;G. Miller
中科院分区：
文献类型：
--
作者：
F. Snodgrass;W. Munk;G. Miller
"Long" ocean waves, with frequencies between 0.2 and xo cycles per hour (cph), have been recorded simultaneously at La Jolla on the California coast and at San Clemente Island, about rno km seaward. The spectral power is greatest at the lowest frequencies but remains fairly uniform (about 5 x 10-2 cm 2 /cph) between 0.7 and xo cph. Comparison of the Island and shore records shows that at the lowest frequencies (below 0.7 cph) the two records are consistently in phase and are highly coherent, as might be expected; above 0.7 cph they are out of phase, and the coherence is low. The phase reversal is fairly abrupt and suggests standing wave patterns, with the implication that the coast must be a good reflector. The failure of the coherence to recover after phase reversal suggests multiple modes, with an appreciable fraction of energy associated with in-phase modes even after most of the energy is out of phase. It is inferred that the observed waves are not only ones that cross the shelf from the deep sea but that comparable energy is present in "trapped" waves that have somehow been excited upon the shelf.
