Improved estimates of the dynamical state of the North Pacific Ocean from a 4 dimensional variational data assimilation
Improved estimates of the dynamical state of the North Pacific Ocean from a 4 dimensional variational data assimilation
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DOI：
10.1029/2003gl017604
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发表时间：
2003-08-29
影响因子：
5.2
通讯作者：
Komori, N
中科院分区：
文献类型：
--
作者：
Masuda, S;Awaji, T;Komori, N
[1]一个四维变分资料同化系统已被用来更好地确定北太平洋的平均季节状态。现有的观测记录和复杂的大气环流模式的综合产生了一个动态一致的随时间变化的数据集，它显示了全球海洋环流的真实特征，不需要人为的温度和盐度场的源或汇。该数据集使我们能够澄清水团的形成和运动过程。使用我们的系统的敏感性实验表明，北太平洋中层水的起源可以追溯到鄂霍次克海和白令海在亚北极地区和亚热带黑潮地区进一步南部，与最近的观测结果相一致。这一结果表明，从我们的数据同化得到的海洋状态有更大的信息和预测潜力比从早期的方法。
[1] A 4-dimensional variational data assimilation system has been used to better define the mean seasonal state of the North Pacific. The synthesis of available observational records and a sophisticated general circulation model produces a dynamically consistent time-varying dataset which exhibits realistic features of the global ocean circulation and requires no artificial sources or sinks for the temperature and salinity fields. The dataset enables us to clarify the water mass formation and movement processes. A sensitivity experiment using our system reveals that the origin of the North Pacific Intermediate Water can be traced back to the Okhotsk and Bering Seas in the subarctic region and to the subtropical Kuroshio region further south, consistent with recent observational findings. This result illustrates that the ocean state derived from our data assimilation has greater information and forecast potential than that obtained from earlier methods.