Journal of Geographical Sciences ›› 2005, Vol. 15 ›› Issue (3): 273-285.doi: 10.1360/gs050302

• Climate and Environmental Change • Previous Articles     Next Articles

A model study on seasonal spatial-temporal variability of the Lagrangian Residual Circulations in the Bohai Sea

LI Guosheng1, WANG Hailong1,2, LI Bailiang1   

  1. 1. Inst. of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;

    2. Graduate School of Chinese Academy of Sciences, Beijing 100039, China
  • Received:2005-04-11 Revised:2005-05-28 Online:2005-09-25 Published:2005-09-25
  • Supported by:

    National Natural Science Foundation of China, No.40271020; Knowledge Innovation Project of the Institute of Geographic Sciences and Natural Resources Research, CAS, No.CXIOG-A04-09

Abstract:

The spatial distribution and seasonal variation of the tide-induced Lagrangian Residual Circulations (LRC hereafter), wind-driven LRC, and the coupling dynamic characteristics were simulated using ECOM, given the Hellerman and Rosenstein global monthly-mean wind stresses. The results showed that the tide-induced LRC of the harmonic constituent m2 bears an identical pattern in four seasons in the Bohai Sea: the surface one is weak with random directions; however, there exist a southeast current from the Bohai Strait to the Laizhou bay, and a weakly anticlockwise gyre in the south of the Bohai Strait for the bottom layer LRC. The magnitude of bottom layer tide-induced LRC is larger than the surface one, and moreover, it contributes significantly to the whole LRC in the Bohai Sea. Unlike the identical structure of the tide-induced LRC, the wind driven LRC varies seasonally under the prevailing monsoon. It forms a distinct gyre under the summer and winter monsoons in July and January respectively, but it seems weak and non-directional in April and September.

Key words: Bohai Sea, Lagrangian Residual Circulation, numerical model, seasonal variations