Eddy Catalog for the Gulf of California (2010–2024) Derived from Hybrid Detection and Tracking Algorithm.
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Dataset scope. This repository provides the complete mesoscale eddy catalog for the Gulf of California (2010–2024), including daily detection maps and a temporal tracking catalog. The workflow was developed during the PhD research of Yuritzy Pérez-Corona (CICESE). Preprocessing. Daily 2-D spatial detrending was applied to each anomaly field (e.g., SSHA, strain, vorticity) by fitting an affine plane A⋅lon+B⋅lat+CA \cdot \mathrm{lon} + B \cdot \mathrm{lat} + CA⋅lon+B⋅lat+C over valid grid points and subtracting it: Inputs: anomalias_GC_NeurOST_2010_2024.nc Outputs per variable: *_dtrend2d on the same (time, lat, lon) grid This step removes large-scale linear gradients prior to eddy extraction. Detection method (hybrid, OW + velocity geometry + contours). Normalized Okubo–Weiss (OW) thresholding (Okubo, 1970; Weiss, 1991) computed from (S_n, S_s, ζ) on detrended fields; conservative dynamic thresholding identifies compact candidates. Local speed minimum gating to suppress jets and background flow. Nencioli ring criterion (Nencioli et al., 2010) enforcing tangential dominance and consistent rotation sign around candidates. Closed-contour selection (Chelton et al., 2011) on SSHA, retaining polygons with sufficient circularity, amplitude relative to the edge, and bounded size. Tracking. Daily detections are linked with a cost-based inertial matching algorithm that prioritizes great-circle proximity to the predicted position, penalizes unrealistic diameter changes, preserves polarity, and tolerates gaps up to 10 days. We also provide a filtered subset retaining tracks with ≥ 14 detections. Files included eddy_detections_hybrid_GoC_2010_2024.nc — Daily eddy detections from detrended anomalies (*_dtrend2d): centroid, diameter/axes/eccentricity, polarity, vorticity, geostrophic velocities, OW, and SSHA-based masks/fields on (time, lat, lon). tracks_catalog_full.nc — Full trajectory catalog (971 tracks; includes short-lived features); flat table indexed by (track_id, time). tracks_catalog_full.csv — CSV mirror of the full catalog. tracks_catalog_min14d.nc — Filtered catalog (394 coherent tracks, ≥14 detections; mean ≈ 46 days). tracks_catalog_min14d.csv — CSV mirror of the filtered subset. Summary statistics Full: 971 tracks; mean lifetime 21.4 days; detections — Cyclonic 10,667, Anticyclonic 10,121. Filtered (≥14 detections): 394 tracks; mean lifetime 46.0 days; detections — Cyclonic 9,274, Anticyclonic 8,850. Data format & units Coordinates: longitude (°E), latitude (°N); daily time step (2010–2024). Distances: km; velocities: km/day; vorticity: s⁻¹; Okubo–Weiss: s⁻². NetCDFs follow CF-conventions where applicable; CSVs are tidy tables. Citation Pérez-Corona, Y., Torres, H., & Ramos-Musalem, K. (2025).Eddy Catalog for the Gulf of California (2010–2024) Derived from a Hybrid Detection and Tracking Algorithm.Zenodo. https://doi.org/10.5281/zenodo.17409704 Keywords: Gulf of California; Mesoscale eddies; Altimetry. References - Okubo, A. (1970). *Horizontal dispersion of floatable particles in the vicinity of velocity singularities.* Deep-Sea Research, 17(3), 445–454. - Weiss, J. (1991). *The dynamics of enstrophy transfer in two-dimensional hydrodynamics.* Physica D, 48, 273–294. - Nencioli, F., Dong, C., Dickey, T., Washburn, L., & McWilliams, J. C. (2010). *A vector geometry-based eddy detection algorithm and its application to a high-resolution numerical model product and high-frequency radar surface velocities in the Southern California Bight.* J. Atmos. Ocean. Technol., 27(3), 564–579. - Chelton, D. B., Schlax, M. G., & Samelson, R. M. (2011). *Global observations of nonlinear mesoscale eddies.* Progress in Oceanography, 91(2), 167–216.
数据集范围。本仓库提供加利福尼亚湾（2010–2024年）完整的中尺度涡（mesoscale eddy）目录，包含每日探测地图与时间追踪目录。该处理流程由Yuritzy Pérez-Corona（墨西哥海洋科学与高等教育中心，CICESE）的博士研究开发。 预处理。针对每个异常场（如海面高度异常（Sea Surface Height Anomaly, SSHA）、应变、涡度），通过在有效网格点上拟合仿射平面$Acdot mathrm{lon} + Bcdot mathrm{lat} + C$，对其进行每日二维空间去趋势处理，并将该平面从原场中扣除： 输入：anomalias_GC_NeurOST_2010_2024.nc 各变量输出：与原（时间、纬度、经度）网格一致的*_dtrend2d文件 该步骤可在涡旋提取前移除大尺度线性梯度。 探测方法（混合方法，结合Okubo-Weiss参数（Okubo–Weiss, OW）、速度几何与闭合轮廓）。 1. 归一化Okubo-Weiss阈值化（Okubo, 1970; Weiss, 1991）：基于去趋势场中的$(S_n, S_s, zeta)$计算得到，采用保守动态阈值识别紧凑候选涡旋。 2. 局部速度最小值门控：用于抑制急流与背景流场。 3. Nencioli涡环判据（Nencioli et al., 2010）：要求候选涡旋满足切向主导性与一致的旋转极性。 4. 闭合轮廓筛选（Chelton et al., 2011）：基于SSHA进行筛选，保留具有足够圆度、相对边缘振幅以及有限尺寸的多边形。 追踪。每日探测结果通过基于代价的惯性匹配算法进行关联，该算法优先考虑大圆距离上与预测位置的接近程度，对不合理的直径变化施加惩罚，保留极性一致性，并允许最长10天的探测间隙。同时提供经过筛选的子集，仅保留包含≥14次探测的轨迹。 包含文件： - eddy_detections_hybrid_GoC_2010_2024.nc：基于去趋势异常场（*_dtrend2d）得到的每日涡旋探测结果文件，包含质心、直径/轴长/偏心率、极性、涡度、地转流速、Okubo-Weiss参数以及基于SSHA的掩膜/场数据，网格维度为（时间、纬度、经度）。 - tracks_catalog_full.nc：完整轨迹目录（共971条轨迹，包含短时特征），为以（轨迹ID、时间）为索引的扁平化数据表。 - tracks_catalog_full.csv：完整目录的CSV镜像文件。 - tracks_catalog_min14d.nc：筛选后的目录（共394条连贯轨迹，包含≥14次探测，平均时长约46天）。 - tracks_catalog_min14d.csv：筛选后子集的CSV镜像文件。 统计摘要 完整数据集：971条轨迹，平均生命周期21.4天；探测结果中，气旋涡10667个，反气旋涡10121个。 筛选后数据集（≥14次探测）：394条轨迹，平均生命周期46.0天；探测结果中，气旋涡9274个，反气旋涡8850个。 数据格式与单位 坐标：经度（°E）、纬度（°N）；时间步长为每日（2010–2024年）。 距离单位：千米（km）；流速单位：千米/天（km/day）；涡度单位：秒⁻¹（s⁻¹）；Okubo-Weiss参数单位：秒⁻²（s⁻²）。 网络通用数据格式（Network Common Data Form, NetCDF）文件遵循CF（气候与预报）规范；CSV文件为整洁数据表（tidy table）。 引用信息 Pérez-Corona, Y., Torres, H., & Ramos-Musalem, K. (2025). 加利福尼亚湾中尺度涡目录（2010–2024）：基于混合探测与追踪算法.Zenodo. https://doi.org/10.5281/zenodo.17409704 关键词：加利福尼亚湾；中尺度涡（mesoscale eddy）；测高数据（Altimetry）。 参考文献 - Okubo, A. (1970). 《速度奇点附近漂浮颗粒的水平扩散》. 《深海研究》, 17(3), 445–454. - Weiss, J. (1991). 《二维流体动力学中涡量传递的动力学特性》. Physica D, 48, 273–294. - Nencioli, F., Dong, C., Dickey, T., Washburn, L., & McWilliams, J. C. (2010). 《基于矢量几何的涡旋探测算法及其在南加州湾高分辨率数值模式产品与高频雷达表面流速中的应用》. 《大气与海洋技术学报》, 27(3), 564–579. - Chelton, D. B., Schlax, M. G., & Samelson, R. M. (2011). 《全球非线性中尺度涡观测》. 《海洋学进展》, 91(2), 167–216.
