CATS2008_v2023: Circum-Antarctic Tidal Simulation 2008, version 2023

CATS2008_v2023 is an update of the original CATS2008 tide model (Howard et al., 2019 [https://doi.org/10.15784/601235]; Padman et al., 2002 [https://doi.org/10.3189/172756402781817752]). It introduces a new model file format, increased resolution, more accurate coastlines, and a simple scaling for ice shelf flexure near grounding lines. The changes included in the new CATS2008_v2023 model are: (1) The CATS2008 model has been interpolated to a finer grid (2 km for CATS2008_v2023 vs 4 km for CATS2008) to provide a better representation of coastlines and ice shelf grounding lines. (2) Coastlines have been adjusted to match BedMachine Antarctica v3 (Morlighem et al., 2020 [https://doi.org/10.1038/s41561-019-0510-8]; Morlighem, 2022 [https://doi.org/10.5067/FPSU0V1MWUB6]). Areas that were previously grounded and had no tidal constituent data in CATS2008 have been filled using MATLAB's ‘regionfill’ function, applied to the real and imaginary components of tidal constituents individually. An ocean mask matching BedMachine Antarctica v3 is provided in the model file to mask out grounded areas. (3) Water depth (water column thickness under ice shelves) has been adjusted to match BedMachine Antarctica v3. (4) An ice shelf flexure model has been included for estimating tidal deflections in grounding zones. Flexure is approximated by a forward 1D linear elastic model applied to BedMachine Antarctica v3 ice geometry, with elastic modulus E=4.8 GPa and Poisson's ratio nu=0.4. The ice flexure can be included as an option when using TMD3.0 (Greene et al., 2024 [https://doi.org/10.21105/joss.06018]) and pyTMD (Sutterley, 2024 [https://doi.org/10.5281/zenodo.10501349]) software packages. (5) The model is provided as a consolidated NetCDF file that can be used with TMD3.0 and pyTMD, but not with earlier TMD versions.

CATS2008_v2023是原始CATS2008潮汐模型（Howard等人，2019 [https://doi.org/10.15784/601235]；Padman等人，2002 [https://doi.org/10.3189/172756402781817752]）的更新版本。该模型引入了全新的模型文件格式、更高的空间分辨率、更精准的海岸线数据，以及针对接地线附近冰架弯曲的简易校正方案。CATS2008_v2023版本的更新内容如下：(1) 将原CATS2008模型插值至更精细的网格（CATS2008_v2023分辨率为2 km，原CATS2008为4 km），以更精准地刻画海岸线与冰架接地线的形态。(2) 调整海岸线以匹配南极冰盖机器数据集第三版（BedMachine Antarctica v3，Morlighem等人，2020 [https://doi.org/10.1038/s41561-019-0510-8]；Morlighem，2022 [https://doi.org/10.5067/FPSU0V1MWUB6]）。针对原CATS2008中原本为陆地区域且无潮汐分潮数据的区域，分别对潮汐分潮的实部与虚部使用MATLAB的'regionfill'函数进行填充。模型文件中附带匹配BedMachine Antarctica v3的海洋掩码，用于屏蔽陆地区域。(3) 调整水深（冰架下的水柱厚度）以匹配BedMachine Antarctica v3数据集。(4) 新增冰架弯曲模型，用于估算接地带的潮汐形变。该弯曲模型采用基于BedMachine Antarctica v3冰体几何参数的一维线性弹性正向模型近似计算，弹性模量E=4.8 GPa，泊松比ν=0.4。用户可在使用TMD3.0与pyTMD软件包时选择启用冰架弯曲校正功能，两款软件分别由Greene等人（2024 [https://doi.org/10.21105/joss.06018]）与Sutterley（2024 [https://doi.org/10.5281/zenodo.10501349]）开发。(5) 本模型以整合式NetCDF文件格式提供，可兼容TMD3.0与pyTMD软件，但无法兼容早期版本的TMD。

搜集汇总

背景与挑战

背景概述

CATS2008_v2023是一个环南极潮汐模拟数据集，提供了更高分辨率的网格（2公里）、更精确的海岸线匹配以及冰架弹性模型，适用于研究南极地区的潮汐和海洋动力学。数据集以NetCDF格式提供，需使用TMD3.0或pyTMD软件包进行处理。