The Navy Global Environmental Model
The Navy Global Environmental Model
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DOI：
10.5670/oceanog.2014.73
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发表时间：
2014-09-01
期刊：
影响因子：
2.8
通讯作者：
Chang, Simon W.
中科院分区：
文献类型：
--
作者：
Hogan, Timothy F.;Liu, Ming;Chang, Simon W.
2013 年 2 月 13 日，美国海军天气预报系统达到了一个里程碑，海军全球环境模型 (NAVGEM) 取代了海军作战全球大气预报系统 (NOGAPS) 进行作战全球天气预报。新的操作系统 NAVGEM 1.1 将半拉格朗日/半隐式动力核心与亚网格尺度潮湿过程、对流、臭氧和辐射的高级参数化相结合。 NAVGEM 动力核心可实现更高的空间分辨率，而无需 NOGAPS 中所需的小时间步长。计算效率的提高预计将在未来的 NAVGEM 版本中显着提高分辨率。 NAVGEM 1.1 过渡中的模型物理改进包括将云液态水、云冰水和臭氧表示为完全预测的成分。在成功测试新的质量通量方案后，于 2013 年 11 月 6 日第二次过渡到 NAVGEM 1.2。将此质量通量参数化添加到涡流扩散垂直混合参数化中，导致海洋对流层低层的低温偏差减少，并进一步提高了 NAVGEM 的预报技能。
On February 13, 2013, the US Navy's weather forecast system reached a milestone when the NAVy Global Environmental Model (NAVGEM) replaced the Navy Operational Global Atmospheric Prediction System (NOGAPS) for operational global weather prediction. The new operational system NAVGEM 1.1 combines a semi-Lagrangian/semi-implicit dynamical core together with advanced parameterizations of subgrid-scale moist processes, convection, ozone, and radiation. The NAVGEM dynamical core allows for much higher spatial resolutions without the need for the small time steps that would be necessary in NOGAPS. The increased computational efficiency is expected to enable significant increases in resolution in future NAVGEM releases. Model physics improvements in the NAVGEM 1.1 transition include representations of cloud liquid water, cloud ice water, and ozone as fully predicted constituents. Following successful testing of a new mass flux scheme, a second transition to NAVGEM 1.2 occurred on November 6, 2013. Addition of this mass flux parameterization to the eddy diffusion vertical mixing parameterization resulted in a reduction of the cold temperature bias of the lower troposphere over ocean and further increased the forecast skill of NAVGEM.