Journal of Tropical Oceanography ›› 2011, Vol. 30 ›› Issue (5): 1-7.doi: 10.11978/j.issn.1009-5470.2011.05.001cstr: 32234.14.j.issn.1009-5470.2011.05.001

• Marine geomorphology •     Next Articles

Specific entropy and isentropic analysis in the ocean

YAN You-fang, GAN Zi-jun   

  1. State Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology , CAS, Guangzhou 510301, China
  • Received:2011-11-01 Revised:2011-11-01 Online:2011-11-01 Published:2011-11-01
  • Contact: 甘子钧 E-mail:youfangyan@scsio.ac.cn

Abstract: Several improvements have been made recently to deal with the thermodynamic properties of seawater and a self-consistent expression for Gibbs potential functions was proposed by Feistel (2003, 2005). Based on this expression and hydrographic datasets, specific entropy, potential density, and potential temperature are calculated and analyzed. It is shown that there exists a significantly high correlation between specific entropy and potential temperature, while the distribution of entropy is not identical to that of potential density or neutral density in the ocean. In addition, a geostrophic streamfunction on isentropic surface is deducted, and the result shows that there exists Montgomery streamfunction on the isentropic surface and the geostrophic flow moves isentropically and isopycnally in order to keep its motion occur without change in the density and entropy of the water mass.

Key words: seawater, specific entropy, geostrophic flow, isentropic analysis

CLC Number: 

  • P731