Reference dataset for sea ice concentration

20251219 All ERA data updated to ERA5, extended SIC0 and SIC1 data until Sentinel 1B End Of Life 2022, SMOS/SMAP data added where needed20211111: The dataset has been augmented with SIC0 (open water) and SIC1 (total ice cover) data from 2016-2019. Version 3 constitutes the entire v2.2.1 dataset and these new 2016-19 files.20190305: The 20190305 update (2.2.1) includes some updated CRREL-IMB based datafiles replacing a few empty files in the 20190207 version (2.2).20190207: Note that there was a bug in our reading of the accumulated ERA-I fields in the original dataset. For time series analysis (CRREL-IMB and OIB-backtrack), please use the ERAreruns dataset now also available here.In version 2.2 (2019-02-07) of the dataset and manual, this issue has been described and corrected. We recommend that all users use version 2.2.<br>The RRDP is a set of comma separated ASCII files which contain reference sea ice concentrations and/or other relevant data and co-located NWP data from ERA-Interim, satellite Brightness Temperatures (TBs) extracted from the AMSR-E/AMSR2 swath datasets, ASCAT, QuikSCAT, SMOS and SMAP data to be used to for ice concentration calculations and evaluations.The dataset is easy to use by reading the files line by line, calculate Sea Ice Concentration from the given TBs and compare with the given reference SIC.Please read the included manual for additional information

20211111：本数据集增补了2016-2019年的SIC0（开阔水域，open water）与SIC1（总海冰覆盖，total ice cover）数据。版本3包含完整的v2.2.1数据集以及上述2016-2019年新增文件。
20190305：20190305更新（版本2.2.1）替换了20190207版本（v2.2）中的部分空文件，采用了更新后的基于CRREL-IMB的数据集文件。
20190207：请注意，原始数据集中ERA-I累积场的读取存在漏洞。针对时间序列分析场景（CRREL-IMB与OIB-backtrack），请使用本页面现已提供的ERAreruns数据集。在本数据集v2.2（2019-02-07）及配套手册中，该问题已被说明并修正。我们建议所有用户使用v2.2版本。
RRDP为一组逗号分隔的ASCII文件，包含用于海冰浓度计算与评估的参考海冰浓度及其他相关数据，同时配套来自ERA-Interim的协同定位数值天气预报（NWP）数据、从AMSR-E/AMSR2条带数据集提取的卫星亮温（TBs），以及ASCAT、QuikSCAT、SMOS与SMAP观测数据。该数据集使用便捷，用户可逐行读取文件，基于给定的亮温计算海冰浓度，并与参考SIC数据进行对比。如需更多信息，请查阅随附手册。