OSCAR全球海表洋流分析资料（1992-2020）

OSCAR（Ocean Surface Currents Analyses Real-time）是一个正在进行的研究项目，旨在改进用卫星数据计算表层洋流和验证方法。OSCAR数据集由地球空间研究中心(ESR)研制，是利用海面高度、风和温度的卫星数据计算出的全球海表洋流，这些数据是由各种卫星和原位仪器观测，使用准稳态地转模式进行计算，结合基于风驱动的涡旋粘性非地转分量和热风调整，该模型计算出上层海洋顶部30米处的平均表层流速。2009年，OSCAR产品被开发出来用于计算1/3度网格上的数据，许多小尺度的特征现在可以在高分辨率的模型中观测到。OSCAR的空间覆盖范围已扩展到尽可能靠近海岸的地方，随时间变化，随卫星数据的边界扩大和收缩。在1/3度的OSCAR系统中，建立了一个赤道区域的动态改进模型。
涉及变量如下：
u：ocean surface zonal currents (m/s)
v：ocean surface meridional currents (m/s)
um：ocean surface zonal currents maximum mask (m/s)
vm：ocean surface meridional maximum mask (m/s)
(Note: Maximum Mask velocity is the geostrophic component at all points any concurrent Ekman and buoyancy components)

OSCAR (Ocean Surface Currents Analyses Real-time) is an ongoing research project aimed at improving satellite data-based methods for calculating and validating surface ocean currents. Developed by the Earth and Space Research Center (ESR), the OSCAR dataset generates global surface ocean currents by processing satellite observations of sea surface height, wind and sea surface temperature, along with data from various in-situ instruments. Calculations are conducted using a quasi-steady geostrophic model, combined with wind-driven eddy-viscous ageostrophic components and thermal wind adjustments, to derive the mean surface current velocities within the top 30 meters of the upper ocean.

In 2009, the OSCAR product was updated to produce data on a 1/3-degree grid, allowing the observation of numerous small-scale features in the high-resolution dataset. The spatial coverage of OSCAR has been expanded to as close to coastlines as possible, and it varies over time, expanding and contracting in line with the boundaries of available satellite data. A dynamically improved model for the equatorial region has been established in the 1/3-degree OSCAR system.

The involved variables are as follows:
u: ocean surface zonal currents (m/s)
v: ocean surface meridional currents (m/s)
um: ocean surface zonal currents maximum mask (m/s)
vm: ocean surface meridional maximum mask (m/s)
Note: The maximum mask velocity refers to the geostrophic component at all points combined with concurrent Ekman and buoyancy components

搜集汇总

背景与挑战

背景概述

OSCAR全球海表洋流分析资料（1992-2020）是由NASA和ESR联合开发的全球海洋表层洋流数据集，采用卫星和原位观测数据，通过准稳态地转模式计算得出30米深度的平均流速，空间分辨率为1/3度，时间分辨率为5天，数据格式为NetCDF。