Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS Passive Microwave Data, Version 2

This data set is generated from brightness temperature data and is designed to provide a consistent time series of sea ice concentrations spanning the coverage of several passive microwave instruments.The data are provided in the polar stereographic projection at a grid cell size of 25 x 25 km.Data coverage began on 26 October 1978 and is ongoing through the most current processing, with updated data processed several times annually.

本数据集由亮温（brightness temperature）数据生成，旨在提供覆盖多款被动微波仪器（passive microwave instruments）观测范围的一致性海冰密集度（sea ice concentrations）时间序列。数据集采用极射赤平投影（polar stereographic projection），网格单元尺寸为25×25千米。数据覆盖时段始于1978年10月26日，至今仍处于最新处理流程覆盖范围内，且每年会多次开展数据更新工作。