Numerical simulation of the Gulf of Mexico (GOM) using the HYbrid Coordinate Ocean Model (HYCOM) from January to December 2018

Physical circulation fields from a 1/25-degree Gulf of Mexico HYbrid Coordinate Ocean Model (HYCOM) simulation spanning January to December 2018. 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 DP06.

本数据集为2018年1月至12月期间，分辨率为1/25度的墨西哥湾混合坐标海洋模式（HYbrid Coordinate Ocean Model, HYCOM）模拟所得的物理环流场。该环流模式的输出变量包含墨西哥湾海域的温度、盐度、流速（海流）以及海面高度。其原生垂直坐标结构为32层时变混合σ/z/rho坐标。为便于终端用户使用，经后处理将其插值为时间不变的50层z坐标垂直结构。本海洋模式的强迫场来自分辨率0.28度的海军全球环境模式（Navy Global Environmental Model, NAVGEM，版本1.3/1.4），模式包含潮汐（TPXO）强迫，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）进行数据同化。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。径流通过“降水伪源”方案在其源点进行参数化，所用数据来自月度气候态全球数据库，该数据库包含各径流的质量输运量及其他相关统计信息。本模拟工作为DEEPEND海洋科考航次DP06提供了支撑。