基于卫星高度计资料提取热带印度洋Rossby波传播速度与变形半径

doi:10.11978/j.issn.1009-5470.2014.05.003

Journal of Tropical Oceanography ›› 2014, Vol. 33 ›› Issue (5): 22-27.doi: 10.11978/j.issn.1009-5470.2014.05.003cstr: 32234.14.j.issn.1009-5470.2014.05.003

Special Issue: 海上丝绸之路专题

• Marine Hydrology • Previous Articles Next Articles

Extraction of Rossby wave speed and deformation radius in the tropical Indian Ocean from multi-satellite altimeter data

ZHANG Guo-sheng^{1, 2}, ZHANG Biao¹, DU Yan³, WANG Lei⁴

1. School of Marine Science, Nanjing University of Information Science and Technology, Nanjing 210044, China; 2. College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China; 3. State Key Laboratory of Tropical Oceanography (South China Sea Institute of Oceanology, Chinese Academy of Sciences), Guangzhou 510301, China; 4. School of Atmosphere Science, Nanjing University, Nanjing 210093, China;

Received:2013-09-18 Revised:2014-04-08 Online:2014-09-29 Published:2014-09-29

Abstract

Abstract: We estimated the Rossby wave phase speed in the tropical Indian Ocean (5°~20°S, and 5°~20°N) based on two- dimensional Radon Transform method, using monthly average sea level anomaly data (1993~2001) from multi-altimeters. We also calculated the first baroclinic gravity-wave phase speed, in combination with Rossby wave theoretical model, and the density by using climatologically averaged temperature and salinity profiles from the Simple Ocean Data Assimilation (SODA) reanalysis data (1993~2008). We found that Rossby wave phase speeds from model simulation and altimeter observations are in good agreement in 5°~20°S, but are quite different in 5°~20°N. The difference is possibly caused by 1) Rossby waves are diffracted and reflected by salient topographic features, and 2) interaction of Rossby waves generated by different boundaries. We computed the Rossby wave deformation radius utilizing the estimated phase speed, and further presented an analytic quadratic formula between latitude and deformation radius.

Key words: tropical Indian Ocean, Rossby wave, altimeter, Radon transform

CLC Number:

P731

ZHANG Guo-sheng, ZHANG Biao, DU Yan, WANG Lei. Extraction of Rossby wave speed and deformation radius in the tropical Indian Ocean from multi-satellite altimeter data[J].Journal of Tropical Oceanography, 2014, 33(5): 22-27.

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Extraction of Rossby wave speed and deformation radius in the tropical Indian Ocean from multi-satellite altimeter data

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