ECCO Ocean Density, Stratification, and Hydrostatic Pressure - Daily Mean llc90 Grid (Version 4 Release 4)

This dataset provides daily-averaged ocean density, stratification, and hydrostatic pressure on the native Lat-Lon-Cap 90 (LLC90) model grid from the ECCO Version 4 Release 4 (V4r4) ocean and sea-ice state estimate. Estimating the Circulation and Climate of the Ocean (ECCO) ocean and sea-ice state estimates are dynamically and kinematically-consistent reconstructions of the three-dimensional time-evolving ocean, sea-ice, and surface atmospheric states. ECCO V4r4 is a free-running solution of the 1-degree global configuration of the MIT general circulation model (MITgcm) that has been fit to observations in a least-squares sense. Observational data constraints used in V4r4 include sea surface height (SSH) from satellite altimeters [ERS-1/2, TOPEX/Poseidon, GFO, ENVISAT, Jason-1,2,3, CryoSat-2, and SARAL/AltiKa]; sea surface temperature (SST) from satellite radiometers [AVHRR], sea surface salinity (SSS) from the Aquarius satellite radiometer/scatterometer, ocean bottom pressure (OBP) from the GRACE satellite gravimeter; sea ice concentration from satellite radiometers [SSM/I and SSMIS], and in-situ ocean temperature and salinity measured with conductivity-temperature-depth (CTD) sensors and expendable bathythermographs (XBTs) from several programs [e.g., WOCE, GO-SHIP, Argo, and others] and platforms [e.g., research vessels, gliders, moorings, ice-tethered profilers, and instrumented pinnipeds]. V4r4 covers the period 1992-01-01T12:00:00 to 2018-01-01T00:00:00.

本数据集提供了基于原生的经纬度-高度-电容 90 (LLC90) 模型网格的每日平均海洋密度、层结和静力压力，数据源自 ECCO 版本 4 发布 4 (V4r4) 海洋与海冰状态估计。ECCO 海洋与海冰状态估计是基于动态和运动学一致性重建的三维时变海洋、海冰和表面大气状态的估计。ECCO V4r4 是对 1 度全球配置的麻省理工学院通用环流模型 (MITgcm) 的自由运行解，该解通过最小二乘法与观测数据进行拟合。V4r4 中使用的观测数据约束包括来自卫星测高计的海面高度 (SSH) [ERS-1/2、TOPEX/Poseidon、GFO、ENVISAT、Jason-1,2,3、CryoSat-2 和 SARAL/AltiKa]；来自卫星辐射计的海面温度 (SST) [AVHRR]；来自 Aquarius 卫星辐射计/散射计的海面盐度 (SSS)；来自 GRACE 卫星重力仪的海洋底部压力 (OBP)；来自卫星辐射计的海冰浓度 [SSM/I 和 SSMIS]，以及通过电导率-温度-深度 (CTD) 传感器和可消耗的深温计 (XBTs) 在多个项目 [例如，WOCE、GO-SHIP、Argo 及其他] 和平台 [例如，研究船、水下滑翔机、系泊浮标、冰 tethered 探测器和装备有仪器的海豹] 中测量的现场海洋温度和盐度。V4r4 覆盖的时间范围为 1992-01-01T12:00:00 至 2018-01-01T00:00:00。