ECCO Ocean Bottom Pressure - Monthly Mean llc90 Grid (Version 4 Release 4)

This dataset provides monthly-averaged ocean bottom pressure and model ocean bottom pressure 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 (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LLC90（Lat-Lon-Cap 90）模型网格的每月平均海洋底部压力和模型海洋底部压力异常数据，数据来源于ECCO版本4发布4（V4r4）海洋与海冰状态估算。Estimating the Circulation and Climate of the Ocean（ECCO）海洋与海冰状态估算是对三维时变海洋、海冰及表面大气状态的动力学和运动学一致性重建。ECCO V4r4是MIT通用环流模型（MITgcm）1度全球配置的自由运行解，该解在最小二乘意义上与观测数据相匹配。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]，以及通过导电率-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及其他]和平台[例如，研究船、滑翔机、锚泊浮标、冰 tethered探测器以及装备了仪器的海豹]进行的海洋温度和盐度原位测量。V4r4覆盖了从1992年1月1日12:00:00至2018年1月1日00:00:00的时间段。