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"Seasonal-to-Interannual Variability of the Ocean During WOCE |
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Estimated by the ECCO Routine Global Ocean Data Assimilation System" |
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|
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Ichiro Fukumori, Benyang Tang, Tong Lee, Dimitris Menemenlis, Zhangfan |
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Xing, Benny Cheng, and Lee-Lueng Fu |
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Seasonal-to-interannual variability is analyzed using WOCE |
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observations in conjunction with products of a global ocean data |
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assimilation system (ECCO, Consortium for "Estimating the Circulation |
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and Climate of the Ocean"). The assimilation products help interpret |
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the near decade-long WOCE observations placing them in context with |
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seasonal-to-interannual variability, such as those associated with |
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ENSO and the phase transition of PDO. Particular focus is placed on |
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variability of the upper ocean in the Pacific and Indian Oceans. The |
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model equivalent of WOCE hydrography is compared with that from |
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observations. Seasonal-to-interannual variability is analzyed by |
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examining changes in the hydrographic structure and their associated |
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variabilities in transport. The model's coherent fields allow budgets |
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of mass, heat, and salt to be analyzed and the origin and fate of |
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water masses evaluated. |
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The data assimilation system is based on a near-global primitive |
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equation model of high resolution (1-deg telescoping to 0.3-deg with |
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10m near surface layers). The assimilation is based on a hierarchy of |
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approaches that consists of a Green's function method, approximate |
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Kalman filter and smoother, and the adjoint method. Measurements from |
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satellite altimetry (TOPEX/POSEIDON) and in situ hydrography (CTDs and |
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XBTs) are assimilated on a routine basis. Analyses are regularly |
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updated and are available via a Live Access Server at |
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http://www.ecco-group.org/las. |
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