SODA3: A New Ocean Climate Reanalysis
SODA3: A New Ocean Climate Reanalysis
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DOI：
10.1175/jcli-d-18-0149.1
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发表时间：
2018-09-01
影响因子：
4.9
通讯作者：
Chen, Ligang
中科院分区：
文献类型：
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作者：
Carton, James A.;Chepurin, Gennady A.;Chen, Ligang
本文介绍了简单海洋数据同化 (SODA3) 海洋再分析的第 3 版，该版本增强了模型分辨率、观测和强迫数据集，并添加了活动海冰。 SODA3 依赖于 NOAA/地球物理流体动力学实验室 CM2.5 耦合模型的海洋部分，标称分辨率为 1/4 度。还实施了一项计划来减少表面通量的偏差。使用这种新的 SODA3 系统创建的长达 37 年的海洋再分析 SODA3.4.2 与上一代 SODA (SODA2.2.4) 以及哈德利中心 EN4.1.1 无模型统计客观分析进行了比较。比较是在热带、中纬度地区和北极进行的，包括对大西洋经向翻转环流的检查。对比表明，SODA3.4.2将系统误差降低到与上层海洋无模型统计客观分析相当的水平。变率的准确性得到了提高，尤其是热带地区的极地，其中北极地区的改善最大，同时地表净热量和淡水通量偏差也大幅减少。这些改进证明了在气候研究（包括高纬度地区）中增加使用海洋再分析的合理性。
This paper describes version 3 of the Simple Ocean Data Assimilation (SODA3) ocean reanalysis with enhancements to model resolution, observation, and forcing datasets, and the addition of active sea ice. SODA3 relies on the ocean component of the NOAA/Geophysical Fluid Dynamics Laboratory CM2.5 coupled model with nominal 1/4 degrees resolution. A scheme has also been implemented to reduce bias in the surface fluxes. A 37-yr-long ocean reanalysis, SODA3.4.2, created using this new SODA3 system is compared to the previous generation of SODA (SODA2.2.4) as well as to the Hadley Centre EN4.1.1 no-model statistical objective analysis. The comparison is carried out in the tropics, the midlatitudes, and the Arctic and includes examinations of the meridional overturning circulation in the Atlantic. The comparison shows that SODA3.4.2 has reduced systematic errors to a level comparable to those of the no-model statistical objective analysis in the upper ocean. The accuracy of variability has been improved particularly poleward of the tropics, with the greatest improvements seen in the Arctic, accompanying a substantial reduction in surface net heat and freshwater flux bias. These improvements justify increasing use of ocean reanalysis for climate studies including the higher latitudes.