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The Copernicus global 1/12° oceanic and sea ice GLORYS12 reanalysis
Frontiers in Earth Science ( IF 2.9 ) Pub Date : 2021-06-29 , DOI: 10.3389/feart.2021.698876 Lellouche Jean-Michel , Greiner Eric , Bourdallé-Badie Romain , Garric Gilles , Melet Angélique , Drévillon Marie , Bricaud Clément , Hamon Mathieu , Le Galloudec Olivier , Regnier Charly , Candela Tony , Testut Charles-Emmanuel , Gasparin Florent , Ruggiero Giovanni , Benkiran Mounir , Drillet Yann , Le Traon Pierre-Yves
Frontiers in Earth Science ( IF 2.9 ) Pub Date : 2021-06-29 , DOI: 10.3389/feart.2021.698876 Lellouche Jean-Michel , Greiner Eric , Bourdallé-Badie Romain , Garric Gilles , Melet Angélique , Drévillon Marie , Bricaud Clément , Hamon Mathieu , Le Galloudec Olivier , Regnier Charly , Candela Tony , Testut Charles-Emmanuel , Gasparin Florent , Ruggiero Giovanni , Benkiran Mounir , Drillet Yann , Le Traon Pierre-Yves
GLORYS12 is a global eddy-resolving physical ocean and sea ice reanalysis at 1/12° horizontal resolution covering the 1993-present altimetry period, designed and implemented in the framework of the Copernicus Marine Environment Monitoring Service (CMEMS). The model component is the NEMO platform driven at the surface by atmospheric conditions from the ECMWF ERA-Interim reanalysis. Ocean observations are assimilated by means of a reduced-order Kalman filter. Along track altimeter sea level anomaly, satellite sea surface temperature and sea ice concentration, as well as in situ temperature and salinity vertical profiles are jointly assimilated. A 3D-VAR scheme provides an additional correction for the slowly-evolving large-scale biases in temperature and salinity. The performance of the reanalysis shows a clear dependency on the time-dependent in situ observation system, which is intrinsic to most reanalyses. The general assessment of GLORYS12 highlights a level of performance at the state-of-the-art and the capacity of the system to capture the main expected climatic interannual variability signals for ocean and sea ice, the general circulation and the inter-basins exchanges. In terms of trends, GLORYS12 shows a higher than observed warming trend together with a slightly lower than observed global mean sea level rise. Comparisons made with an experiment carried out on the same platform without assimilation show the benefit of data assimilation in controlling water masses properties and sea ice cover and their low frequency variability. Moreover, GLORYS12 represents particularly well the small-scale variability of surface dynamics and compares well with independent (non-assimilated) data. Comparisons made with a twin experiment carried out at ¼° resolution allows characterizing and quantifying the strengthened contribution of the 1/12° resolution onto the downscaled dynamics. GLORYS12 provides a reliable physical ocean state for climate variability and supports applications such as seasonal forecasts. In addition, this reanalysis has strong assets to serve regional applications and provide relevant physical conditions for applications such as marine biogeochemistry. In the near future, GLORYS12 will be maintained to be as close as possible to real time and could therefore provide relevant and continuous reference past ocean states for many operational applications.
中文翻译:
哥白尼全球 1/12° 海洋和海冰 GLORYS12 再分析
GLORYS12 是一项全球涡旋物理海洋和海冰再分析,水平分辨率为 1/12°,涵盖 1993 年至今的测高周期,在哥白尼海洋环境监测服务 (CMEMS) 的框架内设计和实施。模型组件是由来自 ECMWF ERA-Interim 再分析的大气条件在地表驱动的 NEMO 平台。海洋观测是通过降阶卡尔曼滤波器同化的。沿轨道高度计海平面异常、卫星海面温度和海冰浓度以及原位温度和盐度垂直剖面被联合同化。3D-VAR 方案为缓慢演变的大尺度温度和盐度偏差提供了额外的校正。再分析的性能明显依赖于随时间变化的原位观测系统,这是大多数再分析所固有的。GLORYS12 的总体评估突出了该系统在捕捉海洋和海冰、大气环流和流域间交换的主要预期气候年际变率信号方面的最先进水平和能力。在趋势方面,GLORYS12 显示出高于观察到的变暖趋势,同时略低于观察到的全球平均海平面上升。与在没有同化的同一平台上进行的实验进行的比较表明数据同化在控制水团特性和海冰覆盖及其低频变化方面的好处。而且,GLORYS12 特别好地代表了表面动力学的小尺度变化,并与独立(非同化)数据进行了很好的比较。与以 1/4° 分辨率进行的双实验进行比较,可以表征和量化 1/12° 分辨率对缩小动态的增强贡献。GLORYS12 为气候变化提供可靠的物理海洋状态,并支持季节性预报等应用。此外,这种再分析具有强大的资产,可以为区域应用提供服务,并为海洋生物地球化学等应用提供相关的物理条件。在不久的将来,GLORYS12 将保持尽可能接近实时,因此可以为许多业务应用提供相关和连续的过去海洋状态参考。
更新日期:2021-06-29
中文翻译:
哥白尼全球 1/12° 海洋和海冰 GLORYS12 再分析
GLORYS12 是一项全球涡旋物理海洋和海冰再分析,水平分辨率为 1/12°,涵盖 1993 年至今的测高周期,在哥白尼海洋环境监测服务 (CMEMS) 的框架内设计和实施。模型组件是由来自 ECMWF ERA-Interim 再分析的大气条件在地表驱动的 NEMO 平台。海洋观测是通过降阶卡尔曼滤波器同化的。沿轨道高度计海平面异常、卫星海面温度和海冰浓度以及原位温度和盐度垂直剖面被联合同化。3D-VAR 方案为缓慢演变的大尺度温度和盐度偏差提供了额外的校正。再分析的性能明显依赖于随时间变化的原位观测系统,这是大多数再分析所固有的。GLORYS12 的总体评估突出了该系统在捕捉海洋和海冰、大气环流和流域间交换的主要预期气候年际变率信号方面的最先进水平和能力。在趋势方面,GLORYS12 显示出高于观察到的变暖趋势,同时略低于观察到的全球平均海平面上升。与在没有同化的同一平台上进行的实验进行的比较表明数据同化在控制水团特性和海冰覆盖及其低频变化方面的好处。而且,GLORYS12 特别好地代表了表面动力学的小尺度变化,并与独立(非同化)数据进行了很好的比较。与以 1/4° 分辨率进行的双实验进行比较,可以表征和量化 1/12° 分辨率对缩小动态的增强贡献。GLORYS12 为气候变化提供可靠的物理海洋状态,并支持季节性预报等应用。此外,这种再分析具有强大的资产,可以为区域应用提供服务,并为海洋生物地球化学等应用提供相关的物理条件。在不久的将来,GLORYS12 将保持尽可能接近实时,因此可以为许多业务应用提供相关和连续的过去海洋状态参考。