ECCO Sea Surface Height - Monthly Mean llc90 Grid (Version 4 Release 4)

This dataset provides monthly-averaged dynamic sea surface height and model sea level anomaly 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 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原生的经纬度-球面帽（Lat-Lon-Cap 90，简称LLC90）模型网格的月平均动态海面高度及模型海平面异常数据，数据来源于ECCO版本4发布4（V4r4）的海洋与海冰状态估算。ECCO海洋与海冰状态估算是对三维时间演化的海洋、海冰及表面大气状态的动态与动力学一致的重构。ECCO V4r4是MIT通用环流模型（MITgcm）1度全球配置的自由运行解，该解已在最小二乘意义上与观测数据进行了拟合。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和模型海平面异常（SSH，如ERS-1/2、TOPEX/Poseidon、GFO、ENVISAT、Jason-1,2,3、CryoSat-2及SARAL/AltiKa）；来自卫星辐射计的海面温度（SST，如AVHRR）；来自Aquarius卫星辐射计/散射计的海面盐度（SSS）；来自GRACE卫星重力计的海洋底部压力（OBP）；来自卫星辐射计的海冰浓度（如SSM/I和SSMIS）；以及通过电导率-温度-深度（CTD）传感器和可抛弃式温度深度仪（XBTs）从多个项目（如WOCE、GO-SHIP、Argo等）和平台（如研究船、水下滑翔机、锚泊浮标、冰链式探测器以及装备有仪器的海豹）现场测量的海洋温度和盐度。V4r4覆盖的时间范围为1992年1月1日12:00:00至2018年1月1日00:00:00。