Journal of Tropical Oceanography ›› 2018, Vol. 37 ›› Issue (6): 41-48.doi: 10.11978/2017134CSTR: 32234.14.2017134

Special Issue: 南海专题

• Marine Meteorology • Previous Articles     Next Articles

Spatial patterns and secular trends of wind energy input into the surface layer in the South China Sea based on SODA reanalysis

Qian YANG1,5(), Chaoran CUI2,5, Yu ZHANG1,5, Zhiyu LIU3, Yuping GUAN1,5,6(), Ruixin HUANG4   

  1. 1. State Key Laboratory of Tropical Oceanography (South China Sea Institute of Oceanology, Chinese Academy of Sciences), Guangzhou 510301, China
    2. CAS Key Laboratory of Ocean Circulation and Waves (Institute of Oceanology, Chinese Academy of Sciences), Qingdao 266071, China
    3. College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China
    4. Woods Hole Oceanographic Institution, Woods Hole, MA02543, USA
    5. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
    6. Zhuhai Joint Innovative Center for Climate-Environment-Ecosystem, Zhuhai 519078, China;
  • Received:2017-12-18 Online:2018-11-20 Published:2018-12-24
  • Supported by:
    National Natural Science Foundation of China (41676021, 41541040, 91228202);Visiting Fellowship (MELRS1608) from the State Key Laboratory of Marine Environmental Science (Xiamen University)

Abstract:

Sea surface wind is not merely a major driving force to the upper-ocean currents; the wind energy input is the main source of mechanical energy to keep these currents moving. To analyze the secular trend of wind energy input into the South China Sea (SCS), we calculate the wind energy input into the surface current, surface geostrophic current and surface ageostrophic current from 1901 and 2010 by using SODA (v 2.2.4) data. The results show that during the past 110 years, the trend of the wind energy input into surface current, surface geostrophic current and surface ageostrophic current decreased on the whole. The reducing amplitude is 56%, 65% and 49%, respectively. The dominant factor is the decline of wind stress (about 35%). Due to the monsoon systems, seasonal variation of wind energy input into the SCS is significant. In winter, the wind energy input is the strongest, mainly in the north and west parts of the basin, and the shape of energy input distribution is like a “boomerang.” Our results have some implication for further understanding SCS circulation in terms of energy.

Key words: South China Sea, wind energy, surface current, geostrophic current, ageostrophic current

CLC Number: 

  • P732.6