违反了 PRIMARY KEY 约束 'PK_t_counter'。不能在对象 'dbo.t_counter' 中插入重复键。 语句已终止。 冬季热带印度洋上层流场异常模态分析-Analysis of Abnormal Upper Circulation over the Tropical Indian Ocean in Winter
doi:  10.3878/j.issn.1006-9585.2016.15011
冬季热带印度洋上层流场异常模态分析

Analysis of Abnormal Upper Circulation over the Tropical Indian Ocean in Winter
摘要点击 62  全文点击 108  投稿时间:2015-01-17  
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基金:  国家重点基础研究发展计划(973计划)2013CB956203
中文关键词:  热带印度洋  流场异常  复经验正交函数(CEOF)分解  南亚冬季风
英文关键词:  Tropical Indian Ocean  Abnormal circulation  Complex EOF decomposition  South Asian winter monsoon
     
作者中文名作者英文名单位
张东凌ZHANG Dongling中国科学院大气物理研究所, 北京 100029
卢姁LU Xu中国人民解放军 61741. 部队, 北京 100094
引用:张东凌,卢姁.2017.冬季热带印度洋上层流场异常模态分析[J].气候与环境研究,22(4):463-472,doi:10.3878/j.issn.1006-9585.2016.15011.
Citation:ZHANG Dongling,LU Xu.2017.Analysis of Abnormal Upper Circulation over the Tropical Indian Ocean in Winter[J].Climatic and Environmental Research(in Chinese),22(4):463-472,doi:10.3878/j.issn.1006-9585.2016.15011.
中文摘要:
      利用复经验正交函数(CEOF)分解对冬季热带印度洋海洋上层流场异常做了模态分析和结果讨论,得到以下主要结果:该流场异常前两个模态均呈现赤道俘获波形式,其异常在赤道上最大,向南北两侧迅速衰减,呈现纬向流的形态;第一、二模态的性质分别是大洋赤道波动的半波和1波形态,这表明此时赤道波动异常在大洋流场异常中占有重要地位。冬季第一模态大洋垂直运动所导致的近表层海温异常与春、秋季不同,此时在赤道印度洋呈现正-负-正的经向分布态势,这与印度洋耦极子(Indian Ocean Dipole,IOD)的不同,并是IOD在冬季衰亡的直接原因。第二模态相应的海温异常则在赤道东印度洋呈现北负南正的分布态势。第一模态与南亚冬季风异常密切有关,为印度洋冬季风环流模态。第一、二模态都有明显的年际变化和年代际变化,年际变化均为3~5年,主要的年代际变化则分别为约18、22年,此外两者还均有约13年的年代际变化。本文第一、二模态年代际变化的主周期也是冬季北太平洋和冬季热带太平洋流场异常第二、一模态的主周期。
Abstract:
      The Complex Empirical Orthogonal Function (CEOF) analysis is applied to discuss the modes and results of abnormal upper circulation over the tropical Indian Ocean in winter. The main conclusions are as follows. The first and second leading modes of the current anomalies are trapped by the equator wave, which decay rapidly poleward from the equator and show a zonal flow pattern. The natures of the first and second modes are the half wave pattern and full wave pattern of the equatorial ocean wave, respectively. This indicates that the equatorial wave anomaly plays an important role in the oceanic flow anomaly. The near-surface sea temperature anomaly resulted from the abnormal vertical motion of the first mode in the winter is different from that in the spring and autumn. In this situation, the distribution of meridional sea temperature anomaly near the equatorial Indian Ocean presents a "+-+" pattern. It is different from Indian Ocean Dipole (IOD) and is the direct reason for the declining of IOD in winter. The sea temperature anomaly corresponding to the second mode presents a pattern of north-negative and south-positive. The first mode is closely related to South Asian winter monsoon anomaly. Both modes demonstrate significant inter-annual and inter-decadal variations. The period of their inter-annual variation is about 3-5 years. The main periods of their inter-decadal variations are about 18 and 22 years, respectively, while they also have a period of about 13 years. The main inter-decadal variations of the first and second modes discussed in this paper correspond to the main inter-decadal variations of the second and first modes of circulation anomaly over the North Pacific and tropical Pacific in winter.
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