Ocean Surface Current Analyses Real-time (OSCAR) Surface Currents - Final 0.25 Degree (Version 2.0)

Ocean Surface Current Analyses Real-time (OSCAR) is a global surface current database and NASA funded research project. OSCAR ocean mixed layer velocities are calculated from satellite-sensed sea surface height gradients, ocean vector winds, and sea surface temperature gradients using a simplified physical model for geostrophy, Ekman, and thermal wind dynamics. Daily averaged surface currents are provided on a global 0.25 x 0.25 degree grid as an average over an assumed well-mixed top 30 m of the ocean from 1993 to present day. OSCAR currents are provided at three quality levels: final, interim and nrt with a respective latency of each of approximately 1 year, 1 month, and 2 days. OSCAR is generated by Earth & Space Research (ESR) https://www.esr.org/research/oscar/. More details on the source datasets, file structure, and methodology can be found in oscarv2guide.pdf.

海洋表面流速分析实时数据库（OSCAR）是一项全球性的海洋表面流速数据库，并由美国国家航空航天局（NASA）资助的研究项目。OSCAR所提供的海洋混合层流速是通过卫星测量的海面高度梯度、海洋矢量风和海面温度梯度，采用简化的地球物理学、Ekman 流动力学和热风动力学物理模型进行计算得出。该数据库每日平均表面流速数据以全球0.25 x 0.25度网格形式提供，代表假设混合良好的海洋表层前30米的平均流速，数据覆盖时间从1993年至今。OSCAR流速数据分为三个质量等级：最终版、中间版和实时版，其各自的延迟时间分别约为1年、1个月和2天。OSCAR由地球与空间研究公司（Earth & Space Research, ESR）生成。有关源数据集、文件结构和方法的详细信息，请参阅oscarv2guide.pdf。