ECCO Global Mean Sea Level - Daily Mean (Version 4 Release 4)

This dataset provides daily-averaged global mean sea level 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 and model sea level anomaly (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 ECCO 版本 4 发布 4（V4r4）海洋与海冰状态估计的每日平均全球平均海平面。ECCO 海洋与海冰状态估计是对三维时间演化的海洋、海冰和表面大气状态的动态与动力学一致重建。ECCO V4r4 是对 MIT 一度全球配置的通用环流模型（MITgcm）进行自由运行解算的结果，该模型已在最小二乘意义上拟合观测数据。V4r4 中使用的观测数据约束包括来自卫星测高仪的海面高度和模型海平面异常（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]，以及使用电导率-温度-深度（CTD）传感器和可消耗式深温计（XBTs）从多个项目[例如 WOCE、GO-SHIP、Argo 以及其他]和平台[例如研究船、水下滑翔机、锚系、冰 tethered 测温仪和装备了仪器的海豹]现场测量的海洋温度和盐度。V4r4 覆盖的时间范围为 1992-01-01T12:00:00 至 2018-01-01T00:00:00。