Developing a common, flexible and efficient framework for weakly coupled ensemble data assimilation based on C-Coupler2.0

Developing a common, flexible and efficient framework for weakly coupled ensemble data assimilation based on C-Coupler2.0
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基于C-Coupler2.0开发通用、灵活、高效的弱耦合集合数据同化框架

DOI:
10.5194/gmd-14-2635-2021
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发表时间:
2021-05
影响因子:
5.1
通讯作者:
Wang Bin
Wang Bin
中科院分区:
地球科学2区
文献类型:
--
作者:
Sun Chao;Liu Li;Li Ruizhe;Yu Xinzhu;Yu Hao;Zhao Biao;Wang Guansuo;Liu Juanjuan;Qiao Fangli;Wang Bin

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抽象的。数据同化(DA)提供模式的初始状态 通过结合观测信息和模型来运行。基于集成的DA 依赖于模型的整体运行的方法已经被广泛使用。在 响应基于耦合模型的无缝预测的发展 甚至地球系统模型,耦合DA现在是DA的主流 发展在本文中,我们将重点讨论 开发耦合集成DA系统,特别是如何方便地 实现耦合模型的总体之间的有效相互作用, DA的方法。本文首先提出了一个新的DA框架DAFCC 1 (Data同化框架基于 C-Coupler 2.0,版本1),对于弱耦合系综DA, 其使得用户能够方便地将DA方法集成到模型中, 模型集合可以直接调用的过程。DAFCC 1 自动有效地处理模型之间的数据交换 系综成员和DA方法没有全球通信, 不需要用户开发额外的代码来实现数据交换 功能.基于DAFCC 1,我们开发了一个弱耦合的例子, 通过将集合DA系统和区域DA系统相结合, 海气波耦合模式这个示例DA系统和我们的 评估表明DAFCC 1在开发弱 耦合系综DA系统和有效性,加速离线 使用磁盘文件作为数据交换接口的DA系统 功能.
Abstract. Data assimilation (DA) provides initial states of model runs by combining observational information and models. Ensemble-based DA methods that depend on the ensemble run of a model have been widely used. In response to the development of seamless prediction based on coupled models or even Earth system models, coupled DA is now in the mainstream of DA development. In this paper, we focus on the technical challenges in developing a coupled ensemble DA system, especially how to conveniently achieve efficient interaction between the ensemble of the coupled model and the DA methods. We first propose a new DA framework, DAFCC1 (Data Assimilation Framework based on C-Coupler2.0, version 1), for weakly coupled ensemble DA, which enables users to conveniently integrate a DA method into a model as a procedure that can be directly called by the model ensemble. DAFCC1 automatically and efficiently handles data exchanges between the model ensemble members and the DA method without global communications and does not require users to develop extra code for implementing the data exchange functionality. Based on DAFCC1, we then develop an example weakly coupled ensemble DA system by combining an ensemble DA system and a regional atmosphere–ocean–wave coupled model. This example DA system and our evaluations demonstrate the correctness of DAFCC1 in developing a weakly coupled ensemble DA system and the effectiveness in accelerating an offline DA system that uses disk files as the interfaces for the data exchange functionality.
DOI: 10.5772/30330
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