Clustered and gridded particle trajectories from the surface velocity field of a Regional Oceanic Modeling System (ROMS) simulation of the northern Gulf of Mexico for a generic winter and summer

Semi-Lagrangian particle tracking is conducted to examine the ability of surface drifters to reproduce Eulerian velocity structure functions in the northern Gulf of Mexico for a generic winter (January, February, March) and summer (July, August, September). Near-surface drifters are tracked by the Lagrangian TRANSport model (LTRANS) with a 30-minute averaged Eulerian velocity field produced by Regional Ocean Modeling System (ROMS) at 0.5 km resolution in summer and winter, and 0.5 km resolution in winter only. Forcing for the models used a set of climatological datasets. The atmospheric forcing is climatological, with a QuikSCAT-based daily product of scatterometer wind stresses (Risien and Chelton 2008), Common Ocean Reference Experiment (CORE; Large and Yeager 2009) monthly heat-flux atmospheric forcing, and Hamburg Ocean Atmosphere Parameters and Fluxes from Satellite Data (HOAPS; Andersson et al. 2010) monthly freshwater atmospheric forcing. No tidal forcing is used, and a daily river forcing is applied based on daily river volume flux data from the USGS for the year 2010. This dataset supports the publication: Pearson, J., Fox-Kemper, B., Barkan, R., Choi, J., Bracco, A., & McWilliams, J. C. (2019). Impacts of Convergence on Structure Functions from Surface Drifters in the Gulf of Mexico. Journal of Physical Oceanography, 49(3), 675–690. doi:10.1175/jpo-d-18-0029.1.

本研究采用半拉格朗日粒子追踪（Semi-Lagrangian particle tracking）方法，以检验表层浮标复现墨西哥湾北部欧拉速度结构函数的能力，研究时段涵盖典型冬季（1月、2月、3月）与夏季（7月、8月、9月）。研究使用拉格朗日输运模型（Lagrangian TRANSport model, LTRANS）追踪近表层浮标，其驱动的30分钟平均欧拉速度场由区域海洋模式（Regional Ocean Modeling System, ROMS）生成，夏季与冬季分辨率均为0.5千米，冬季仅采用0.5千米分辨率。模式的强迫场采用一系列气候态数据集：大气强迫场为气候态数据，包括基于QuikSCAT的散射仪风应力日产品（Risien and Chelton 2008）、通用海洋参考试验（Common Ocean Reference Experiment, CORE; Large and Yeager 2009）的月尺度热通量大气强迫，以及基于卫星数据的汉堡海洋-大气参数与通量数据集（Hamburg Ocean Atmosphere Parameters and Fluxes from Satellite Data, HOAPS; Andersson et al. 2010）的月尺度淡水通量大气强迫。本数据集未引入潮汐强迫，同时基于美国地质调查局（USGS）2010年的日尺度河流体积通量数据，添加了日尺度河流强迫项。本数据集支撑以下发表论文：Pearson, J., Fox-Kemper, B., Barkan, R., Choi, J., Bracco, A., & McWilliams, J. C. (2019). 辐合作用对墨西哥湾表层浮标速度结构函数的影响. 《物理海洋学杂志》, 49(3), 675–690. doi:10.1175/jpo-d-18-0029.1.