AMM15: a new high-resolution NEMO configuration for operational simulation of the European north-west shelf
AMM15: a new high-resolution NEMO configuration for operational simulation of the European north-west shelf
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DOI：
10.5194/gmd-11-681-2018
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发表时间：
2018-02-22
影响因子：
5.1
通讯作者：
Adame, C. Gabriela Mayorga
中科院分区：
文献类型：
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作者：
Graham, Jennifer A.;O'Dea, Enda;Adame, C. Gabriela Mayorga
本文介绍了欧洲西北大陆架的下一代海洋预报模型，该模型将成为2018年业务预报的基础。这个新系统将提供分辨率的阶跃变化，因此我们能够代表小规模的过程。新模型的分辨率为1.5公里，而目前的操作系统的网格间距为7公里。AMM 15（大西洋边缘模式，1.5公里）是NEMO v3.6的一个新的区域配置。在这里，我们描述了这种配置背后的技术细节，并进行了适当的修改，以适应新的高分辨率域。从30年的非同化运行使用AMM15域的结果表明，该模式的能力，以代表的平均状态和变化的region.Overall，有一个改进的平均状态的代表性在整个地区，这表明类似的改进可能会出现在未来的业务系统。然而，季节性偏差的减少是更大的货架比货架上。在北海，偏见基本上没有改变。由于垂直分辨率或参数化方案没有变化，在分层主要由垂直过程而不是平流控制的区域，预计性能不会提高。这突出了这样一个事实，即水平分辨率的提高不会导致全域的改进。需要进一步开展工作，以减少整个西北大陆架区域的偏差。
This paper describes the next-generation ocean forecast model for the European north-west shelf, which will become the basis of operational forecasts in 2018. This new system will provide a step change in resolution and therefore our ability to represent small-scale processes. The new model has a resolution of 1.5 km compared with a grid spacing of 7 km in the current operational system. AMM15 (Atlantic Margin Model, 1.5 km) is introduced as a new regional configuration of NEMO v3.6. Here we describe the technical details behind this configuration, with modifications appropriate for the new high-resolution domain. Results from a 30-year non-assimilative run using the AMM15 domain demonstrate the ability of this model to represent the mean state and variability of the region.Overall, there is an improvement in the representation of the mean state across the region, suggesting similar improvements may be seen in the future operational system. However, the reduction in seasonal bias is greater off-shelf than on-shelf. In the North Sea, biases are largely unchanged. Since there has been no change to the vertical resolution or parameterization schemes, performance improvements are not expected in regions where stratification is dominated by vertical processes rather than advection. This highlights the fact that increased horizontal resolution will not lead to domain-wide improvements. Further work is needed to target bias reduction across the north-west shelf region.