Journal of Tropical Oceanography >
Distribution characteristics of critical periods of Rossby waves and sea-surface height anomaly power spectra in the South China Sea
Received date: 2009-04-02
Revised date: 2009-05-22
Online published: 2010-07-29
Supported by
中国科学院知识创新工程重大项目(KZCX1-YW-12-01); 中国科学院领域前沿项目(LYQY200702); 国家自然科学基金(40776008, 40976010)
Using the climatological ocean temperature and salinity data from the Word Ocean Atlas 2001 (WOA01), the authors analyze the distribution of Rossby waves’ critical periods in the South China Sea (SCS) and compare the distribution in the SCS with that in the Northwest Pacific at the same latitude. The result shows that Rossby waves’ critical periods become longer at higher latitudes. Because of the special topography in the SCS, the isolines of Rossby waves’ critical periods in the SCS stretch in a northeast-southwest direction rather than zonally as in the North Pacific. From analyzing the power spectra of the sea-surface height anomalies (SSHA) in the SCS, we find that in the central SCS each of the SSHA power spectral critical periods is close to the local Rossby waves’ critical period and presents similar change of the Rossby critical period as latitude increases. From observations, they validate the theoretical prediction that when the critical period of the wind stress curl power spectrum is equal or smaller than that of the local Rossby waves’ the critical period of the ocean responding power spectrum equals to that of the local Rossby waves’.
YANG Qi,CHEN Gui-ying,SHANG Xiao-dong . Distribution characteristics of critical periods of Rossby waves and sea-surface height anomaly power spectra in the South China Sea[J]. Journal of Tropical Oceanography, 2010 , 29(4) : 20 -25 . DOI: 10.11978/j.issn.1009-5470.2010.04.020
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