摘要
利用1993—2008年法国空间局的AVISO多卫星融合高度计资料,采用随机动态、EOF等方法分析全球海平面变化的长期趋势、变化幅度以及季节变化的空间分布特征.结果表明:(a)1993—2008年间太平洋海平面呈西升东降的形态,印度洋绝大部分海区海平面呈上升趋势,大西洋除湾流流域外的其他海区海平面的长期趋势以上升为主;(b)全球海平面变化存在显著的年变化和半年变化等季节信号,无论是半球平均还是洋盆平均,北半球海平面季节变化的振幅明显大于南半球,中纬度海区季节变化的振幅最大;(c)北印度洋海平面季节变化的振幅高于同纬度带的北太平洋和北大西洋;(d)太平洋、印度洋、大西洋三大洋受西边界流、赤道流系等强流影响的海域海平面变化幅度大于周围海域;(e)赤道海域各大洋东、西边界和大洋内区海平面变化不同步,可能受赤道海洋波动的影响较大;(f)厄尔尼诺年,西太平洋暖池和赤道太平洋中部海平面明显降低,赤道东太平洋海域海平面明显升高,赤道印度洋海域东、西边界的海平面变化与其相反.
Based on the AVISO multi-altimeter data obtained by the Centre National d＇ E＇tudes Spatiales of France during the period from 1993 to 2008, the spatial distributions of long-term change and seasonal change of the global sea level were studied using the stochastic dynamic and EOF methods. The results show the following： （a） From 1993 to 2008, the Pacific sea level rose in the west and dropped in the east; the sea level of the Indian Ocean basically rose; and the Atlantic Ocean had a sea level rise in most areas except the Gulf Stream. （b） The global sea level change was characterized by significant seasonal （annual and semi-annual） variation, which was more significant in the Northern Hemisphere than in the Southern Hemisphere. The most significant seasonal variation occurred in the mid-latitude area. （c） The seasonal sea level variation in the North Indian Ocean was more significant than in the North Pacific and North Atlantic in the same latitude band. （d） The sea level in the regions with strong flow, including the western boundary current and equatorial currents, showed larger variability than that in the surrounding area. （e） Affected by equatorial waves, the sea level change in the low-latitude area was not synchronous with that in the west and east. （f） During the E1 Nino year, the sea level dropped significantly in the western pacific warm pool and the central equatorial Pacific, and rose significantly in the equatorial eastern Pacific, while the sea level in the equatorial Indian Ocean changed reversely.
出处
《河海大学学报（自然科学版）》
CAS
CSCD
北大核心
2012年第3期325-331,共7页
Journal of Hohai University(Natural Sciences)
基金
国家自然科学基金(40976006)
河海大学自然科学基金(2009427111)
中央高校基本科研业务费专项(2009B02614)
卫星海洋环境动力学国家重点实验室开放基金(SOED1109)
