“两洋一海”四维变分（伴随）状态估算数据集

为获得印太区域具有涡解能力且动力一致的四维海洋状态估算结果，基于GECCO系统框架构建了2015和2016年该区域的四维变分（伴随）数据同化系统。此系统输出的模式解命名为“两洋一海”四维变分（伴随）状态估算数据集（TOOSSE）。模式区域范围为28°S-42°N， 31°E-69°W，包括中低纬度的太平洋和印度洋，以及两者之间的南海和印尼群岛海域。水平分辨率为1/6°×1/6°，垂向分为50层，层厚从近海表的10m逐渐增大到近海底的450m。TOOSSE的元素场由海洋状态场和控制变量场调整组成。海洋状态场包括海表面高度、温度、盐度、纬向流速、经向流速和垂向流速。控制变量场调整包括海表大气温度调整、海表比湿调整、海表纬向风速调整、海表经向风速调整、净降水调整、向下长波辐射调整、初始温度调整、初始盐度调整和背景垂向扩散率调整。

To obtain vortex-resolving, dynamically consistent four-dimensional (4D) ocean state estimates for the Indo-Pacific region, a four-dimensional variational (4D-Var, adjoint) data assimilation system for this region in 2015 and 2016 was developed based on the GECCO system framework. The model outputs from this system are named the Two-Oceans-and-One-Sea Four-Dimensional Variational (Adjoint) State Estimate Dataset (TOOSSE). The model domain spans 28°S–42°N and 31°E–69°W, covering the mid-to-low latitude Pacific and Indian Oceans, as well as the South China Sea and Indonesian Archipelago seas between them. The horizontal resolution is 1/6° × 1/6°, with 50 vertical layers, where the layer thickness gradually increases from 10 m near the sea surface to 450 m near the seafloor. The elemental fields of TOOSSE consist of ocean state fields and control variable field adjustments. The ocean state fields include sea surface height, temperature, salinity, zonal current velocity, meridional current velocity, and vertical current velocity. The control variable field adjustments include sea surface air temperature adjustment, sea surface specific humidity adjustment, sea surface zonal wind speed adjustment, sea surface meridional wind speed adjustment, net precipitation adjustment, downward longwave radiation adjustment, initial temperature adjustment, initial salinity adjustment, and background vertical diffusivity adjustment.