| 摘要: |
| 利用1992～2001年Topex/Poseidon卫星高度计遥感资料分析了太平洋东南海域(5°～55°S,70°～120°W)表层流场的季节及年际变化特征。结果表明,南赤道流的季节变化主要体现在流速上,而秘鲁海流和西风漂流主要体现在流轴位置的移动上。表层流场的年际变化受El Nino影响,在El Nino期间,南赤道流和秘鲁海流均发生流向偏转现象,大部分海区流场被削弱(除低纬度海区外),而在其后的1998年La Nina期间,流场则重新被加强,西风漂流无明显的年际变化。 |
| 关键词: 太平洋东南海域 Topex/Poseidon卫星高度计遥感资料 表层地转流 |
| DOI： |
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| 基金项目:国家863计划资助项目(2001AA630701) |
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| Seasonal and interannual variations of sea surface geostrophic current in the Southeast Pacific |
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| Abstract: |
| The seasonal and interannual variations of surface geostrophic current in the Southeast Pacific(5°～55°S, 70°～120°W) have been analyzed using Topex/Poseidon altimeter data during 1992～2001. The results show that the South Equatorial Current is characterized with seasonal variation on the magititude of velocity, while the Peru Current and West Wind Drift reflect the shift of the current axes. The interannual variation of the current field is mainly caused by El Nino events. During the El Nino events, both South Equatorial Current and Peru Current at the low latitude region turn their directions to be eastward, and the current field at the higher latitude region is strongly weakened, with smaller current speed and random direction. |
| Key words: Southeast Pacific Ocean Topex/Poseidon altimeter data surface geostrophic current |
