GHRSST Level 4 K10_SST Global 10 km Analyzed Sea Surface Temperature from Naval Oceanographic Office (NAVO) in GDS2.0

This is a Group for High Resolution Sea Surface Temperature (GHRSST) Level 4 sea surface temperature (SST) analysis dataset produced daily on an operational basis by the Naval Oceanographic Office (NAVO) on a global 0.1x0.1 degree grid. The K10 (NAVO 10-km gridded SST analyzed product) L4 analysis uses SST observations from the following instruments: Advanced Very High Resolution Radiometer (AVHRR), Visible Infrared Imaging Radiometer Suite (VIIRS), and Spinning Enhanced Visible and InfraRed Imager (SEVIRI). The AVHRR data for this comes from the MetOp-A, MetOp-B, and NOAA-19 satellites; VIIRS data is sourced from the Suomi_NPP satellite; SEVIRI data comes from the Meteosat-8 and -11 satellites. The age (time-lag), reliability, and resolution of the data are used in the weighted average with the analysis tuned to represent SST at a reference depth of 1-meter. Input data from the AVHRR Pathfinder 9km climatology dataset (1985-1999) is used when no new satellite SST retrievals are available after 34 days. Comparing with its predecessor (DOI: https://doi.org/10.5067/GHK10-L4N01 ), this updated dataset has no major changes in Level-4 interpolated K10 algorithm, except for using different satellite instrument data, and updating metadata and file format. The major updates include: (a) updated and enhanced the granule-level metadata information, (b) converted the SST file from GHRSST Data Specification (GDS) v1.0 to v2.0, (c) added the sea_ice_fraction variable to the product, and (d) updated the filename convention to reflect compliance with GDS v2.0.

本数据集为海军海洋局（NAVO）每日基于全球0.1x0.1度网格，按运行模式生成的高分辨率海表温度（GHRSST）第4级海表温度（SST）分析数据集。K10（NAVO 10公里网格化SST分析产品）第4级分析采用了以下仪器的SST观测数据：先进甚高分辨率辐射计（AVHRR）、可见光红外成像仪套装（VIIRS）以及旋转增强型可见光和红外成像仪（SEVIRI）。其中，AVHRR数据源自MetOp-A、MetOp-B和NOAA-19卫星；VIIRS数据来源于Suomi_NPP卫星；SEVIRI数据来自Meteosat-8和-11卫星。数据的时间滞后（时间差）、可靠性及分辨率均纳入加权平均，分析调整以反映1米参考深度的SST。当在34天后无新的卫星SST检索数据可用时，将使用AVHRR路径追踪9公里气候数据集（1985-1999）的数据。与先前的版本（DOI: https://doi.org/10.5067/GHK10-L4N01）相比，本更新版数据集在第4级插值K10算法方面未发生重大变化，仅在使用不同的卫星仪器数据和更新元数据及文件格式方面有所区别。主要更新包括：（a）更新并增强了粒度级元数据信息，（b）将SST文件从GHRSST数据规范（GDS）v1.0转换为v2.0，（c）向产品中添加了海冰分数变量，以及（d）更新了文件名规范以符合GDS v2.0规范。