NEMO v4.2 eORCA1 data with RIS, FRIS and LCIS explicit
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PROJECT OPEN https://www.katofthesea.com/project-open OBJECTIVES As a first step towards better representing AABW source waters in NEMO global ocean 1° (eORCA1), we explicitly simulate circulation beneath Filchner-Ronne (FRIS), Larsen C (LCIS), and Ross (RIS) ice shelves. These ice shelves were chosen due to their role in the formation and setting of properties of the parent waters of AABW. METHODOLOGY NEMO version 4.2 Beta Forced with 2 cycles of CORE forcing for a reference “Closed” cavity run and an “Open” run with FRIS, LCIS and RIS represented. Inform initial conditions using an idealized regional configuration of each ice shelf. PROVIDED HERE: NAMELISTS: - NEMO reference namelist (namelist_ref; also available with NEMO code), OPEN configuration (namelist_core_ia_cfg) namelist and sea ice namelists (namelist_ice_ref and namelist_ice_cfg). Unless stated otherwise in the “cfg” namelist, the simulation uses the namelist choices provided in the “ref” namelist. The namelist_core_ia_cfg is a namelist specific to a global ocean configuration (ORCA2, ORCA1, ORCA025 etc) forced by interannual core winds. For more information on all the namelist parameters included in these namelists, please refer to the NEMO reference manual available on Zenodo (10.5281/zenodo.6334656). DOMAIN FILES AND INITIAL CONDITIONS: - Initial conditions where data inside the cavity is informed using an idealized regional configuration with World Ocean Atlas (WOA; https://www.nodc.noaa.gov/OC5/woa18/woa18data.html) restoring at the boundaries. The data in the cavities is merged with WOA with a smoothing spline applied along the ice shelf front. - A domain file containing bathymetry and ice shelf draft with FRIS, LCIS and RIS open along with accompanying mesh mask file. - The adapted eddy viscosity files where viscosity varies south of 65 degrees South according to grid cell size. - A freshwater flux file where the melt rate from all cavities except FRIS, LCIS and RIS is prescribed. Inside the "Open" cavities, the melt paramaterization is turned off and the location of melt is moved to the grounding line in case in the future we would like to include the flux from grounding line rives. MODEL OUTPUT: The data uploaded in this zip file is split into the output from the "Closed" and "Open" runs and is listed under eORCA1_output. Here the temperature and salinity fields used for comparison with WOA are provided (1981-2009), along with specific sections extracted using the PAGO functions (https://www.whoi.edu/science/PO/pago/) along FRIS and RIS for certain dates that correspond to CTD sections in the area. To facilitate easy plotting of the example scripts provided, we have also extracted the thermohaline and velocity fields for FRIS cavity and adjacent continental shelf. The user can use these for a first try with the scripts provided and then move on to extracting their areas and dates of interest from the regional 1981-2009 files. EXAMPLE SCRIPS: To get the user familiar with the provided data, we have provided example scripts for extracting the data (open_eORCA_FRIS), plotting bathymetry and T-S (plot_bathy_T_S) and plotting the meridional overturning function and barotropic stream function in the cavity (plot_MOC_BSF_melt). In this same script the melt rate pattern is plotted and the net melt over various time periods corresponding to observational studies is calculated using calculating_net_melt. Additionally, a script plotting temperature and salinity across FRIS ice shelf front for the period February-March 1995 is provided and can be adapted and used to plot the other sections of data provided in this zip. ACKNOWLEDGEMENTS AND FINANCIAL SUPPORT Katherine Hutchinson received financial support of the European Union’s Horizon 2020 research and innovation programme Marie Skłodowska-Curie grant agreement No 898058 (Project OPEN). Nicolas Jourdain received support from the European Union’s Horizon 2020 research and innovation programme under grant agreement no. 101003536 (ESM2025). Pierre Mathiot acknowledges support from the European Union’s Horizon 2020 research and innovation programme under grant agreement no. 820575 (TiPACCs). This work was performed using HPC resources from GENCI–IDRIS (Grant 2021- A0100107451) and from the IPSL Mesocentre ESPRI. Project OPEN is a participant in the h2020 open access data pilot.
### 项目OPEN 访问网址：https://www.katofthesea.com/project-open ### 研究目标 为了在NEMO全球海洋1°分辨率模式（eORCA1）中更精准地表征南极底层水（Antarctic Bottom Water, AABW）的源区水体，我们显式模拟了菲尔希纳-龙尼冰架（Filchner-Ronne Ice Shelf, FRIS）、拉森C冰架（Larsen C Ice Shelf, LCIS）以及罗斯冰架（Ross Ice Shelf, RIS）下方的环流。选择上述三座冰架的原因在于，它们在南极底层水母水团的形成与属性设定过程中发挥着关键作用。 ### 研究方法 本研究采用NEMO 4.2 Beta版本模式，使用CORE强迫场完成两个循环的模拟：一是参考性的"封闭空腔"试验，二是显式包含FRIS、LCIS和RIS的"开放空腔"试验。初始条件通过各冰架的理想化区域配置进行构建。 ### 提供的数据集内容 #### 配置文件（NAMELISTS） - NEMO参考配置文件（namelist_ref，可随NEMO源码获取）、OPEN试验配置文件（namelist_core_ia_cfg）以及海冰配置文件（namelist_ice_ref与namelist_ice_cfg）。除"cfg"配置文件中另有说明外，模拟均采用"ref"配置文件中的参数设置。namelist_core_ia_cfg是专为全球海洋配置（如ORCA2、ORCA1、ORCA025等）设计的配置文件，采用年际尺度CORE风场强迫。如需了解上述配置文件中所有参数的详细信息，请参阅Zenodo平台上发布的NEMO参考手册（DOI: 10.5281/zenodo.6334656）。 #### 网格文件与初始条件 - 空腔内部的初始条件采用理想化区域配置构建，边界处采用世界海洋图集（World Ocean Atlas, WOA；https://www.nodc.noaa.gov/OC5/woa18/woa18data.html）的数据进行恢复性约束。空腔内的水体数据与WOA数据进行融合，并沿冰架前缘应用平滑样条进行平滑处理。 - 包含地形与冰架底深的网格文件，其中FRIS、LCIS和RIS为开放空腔配置，附带配套的网格掩码文件。 - 修正后的涡动黏性系数文件：南纬65°以南区域的黏性系数随网格单元尺寸变化。 - 淡水通量文件：除FRIS、LCIS和RIS之外的所有空腔的融冰速率均为预设值。在"开放空腔"试验中，融冰参数化方案被关闭，融冰位置被设定在冰架接地线处，以便未来可引入接地线径流带来的通量。 ### 模式输出结果 本压缩包上传的数据分为"封闭空腔"与"开放空腔"两场试验的输出结果，归类于eORCA1_output目录下。其中提供了可与WOA数据对比的1981-2009年温度与盐度场，同时提取了对应区域CTD剖面的特定日期下沿FRIS和RIS的剖面数据，提取过程使用PAGO工具（https://www.whoi.edu/science/PO/pago/）完成。为方便用户使用提供的示例脚本进行绘图，我们还提取了FRIS空腔及相邻大陆架的温盐场与流场数据。用户可先使用这些数据完成示例脚本的测试，之后再从1981-2009年的区域文件中提取自身感兴趣的区域与时段的数据。 ### 示例脚本 为帮助用户熟悉提供的数据，我们编写了多组示例脚本：包括数据提取脚本（open_eORCA_FRIS）、地形与温盐剖面绘图脚本（plot_bathy_T_S），以及空腔内经向翻转环流与正压流函数绘图脚本（plot_MOC_BSF_melt）。上述脚本可绘制融冰速率分布，并通过calculating_net_melt工具计算与观测研究匹配的多时段净融冰量。此外，还提供了1995年2-3月FRIS冰架前缘温度与盐度剖面的绘图脚本，用户可对其进行修改，用于绘制本压缩包中提供的其他剖面数据。 ### 致谢与经费支持 Katherine Hutchinson 得到了欧盟地平线2020研究与创新计划玛丽·居里奖学金项目（协议号：898058，Project OPEN）的经费支持。Nicolas Jourdain 得到了欧盟地平线2020研究与创新计划资助项目（协议号：101003536，ESM2025）的支持。Pierre Mathiot 感谢欧盟地平线2020研究与创新计划资助项目（协议号：820575，TiPACCs）的支持。本研究使用了GENCI–IDRIS的高性能计算资源（Grant 2021-A0100107451）以及IPSL中央计算平台ESPRI的资源。Project OPEN 是欧盟地平线2020开放数据试点计划的参与项目之一。
