Rossby波临界周期与海面高度异常能谱临界周期在南海的空间分布特征

doi:10.11978/j.issn.1009-5470.2010.04.020

Journal of Tropical Oceanography ›› 2010, Vol. 29 ›› Issue (4): 20-25.doi: 10.11978/j.issn.1009-5470.2010.04.020cstr: 32234.14.j.issn.1009-5470.2010.04.020

• Marine hydrology • Previous Articles Next Articles

Distribution characteristics of critical periods of Rossby waves and sea-surface height anomaly power spectra in the South China Sea

YANG Qi1, 2, 3, CHEN Gui-ying1, SHANG Xiao-dong1

1. Key Laboratory of Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology, CAS, Guangzhou 510301, China; 2. Graduate University of CAS, Beijing 100049, China; 3. Shanghai Marine Meteorological Center, Shanghai 201300, China

Received:2009-04-02 Revised:2009-05-22 Online:2010-07-31 Published:2010-07-29
Contact: 尚晓东。 E-mail:E-mail: xdshang@scsio.ac.cn
About author:杨棋(1983—), 女, 四川省攀枝花市人, 硕士研究生, 从事物理海洋学研究。
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)

Abstract

Abstract:

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’.

Key words: critical period, the South China Sea, Rossby wave, sea-surface height anomaly power spectrum, wind stress curl

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.

References

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Distribution characteristics of critical periods of Rossby waves and sea-surface height anomaly power spectra in the South China Sea

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