Numerical simulation of the Gulf of Mexico (GOM) using the HYbrid Coordinate Ocean Model (HYCOM) from January to December 2017

Physical circulation fields from a 1/25-degree Gulf of Mexico HYbrid Coordinate Ocean Model (HYCOM) simulation spanning January to December 2017. The circulation model output includes temperature, salinity, velocity (currents), sea surface elevation in the Gulf of Mexico. The native vertical structure is a 32-layer hybrid time-variant sigma/z/rho. Post-processing interpolates it to a time-invariant 50-level z vertical structure for end-user dissemination. The ocean model is forced by the Navy Global Environmental Model (NAVGEM, version 1.3/1.4) at 0.28-degree resolution, includes tides (TPXO), and 3D Variational data-assimilation (Navy Coupled Ocean Data Assimilation- NCODA). Tidal boundary conditions for water level and barotropic velocity are provided by the Oregon State University global Ocean Tide Inverse Solution (OTIS). Rivers are implemented as a 'precipitation bogus' at the river source specified by a monthly climatological global database, that includes the mass-transports and other pertinent demographics for each river. This modeling effort supported DEEPEND oceanographic cruise DP05.本数据集为2017年1月至12月期间，分辨率为1/25°的墨西哥湾混合坐标海洋模型（HYbrid Coordinate Ocean Model, HYCOM）模拟得到的物理环流场数据。该环流模型的输出变量包含墨西哥湾海域的海水温度、盐度、流速（海流）以及海面高度。其原生垂向结构为32层随时间变化的sigma/z/rho混合坐标格式，经后处理后被插值为固定垂向的50层z坐标格式，以供终端用户获取使用。该海洋模型的强迫场来自分辨率0.28°的美国海军全球环境模型（Navy Global Environmental Model, NAVGEM，版本1.3/1.4），同时纳入了潮汐（TPXO）数据，并采用三维变分数据同化方案——海军耦合海洋数据同化系统（Navy Coupled Ocean Data Assimilation, NCODA）进行数据融合。水位与正压流速的潮汐边界条件由俄勒冈州立大学全球海洋潮汐反演解（Oregon State University global Ocean Tide Inverse Solution, OTIS）提供。河流边界条件以“降水虚假源（precipitation bogus）”的形式在月气候态全球数据库指定的河流源点实现，该数据库包含各河流的质量输运量及其他相关水文统计信息。本数值模拟工作为DEEPEND海洋科考航次DP05提供了数据支持。