Sea Ice Concentrations from Nimbus-7 Scanning Multichannel Microwave Radiometer (SMMR) and Defense Meteorological Satellites Program (DMSP) Special Sensor Microwave Imager - Special Sensor Microwave Imager Sounder (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.
This product is designed to provide a consistent time series of sea ice concentrations—the fraction of ocean area covered by sea ice—for the entire passive microwave record. Sea ice algorithm coefficients are calibrated to reduce differences in sea ice extent and area estimates between the SMMR, SSM/I and SSMIS sensors. The data are generated using the NASA Team algorithm developed by the Cryospheric Sciences Laboratory at the NASA Goddard Space Flight Center (GSFC).
DiGirolamo, N., Parkinson, C. L., Cavalieri, D. J., Gloersen, P. & Zwally, H. J. (2022). Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I-SSMIS Passive Microwave Data. (NSIDC-0051, Version 2). [Data Set]. Boulder, Colorado USA. NASA National Snow and Ice Data Center Distributed Active Archive Center. https://doi.org/10.5067/MPYG15WAA4WX. [describe subset used if applicable]. Date Accessed 12-09-2024.

本数据集基于亮温数据生成，旨在提供覆盖多款被动微波仪器观测范围的海冰密集度连续时间序列。数据采用极射赤面投影（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，目前仍在持续更新至最新处理批次，每年会开展多次数据更新处理。
本产品旨在为完整的被动微波观测记录提供一致的海冰密集度时间序列——海冰密集度指海洋区域被海冰覆盖的面积占比。为缩小SMMR、SSM/I与SSMIS传感器间海冰范围与面积估算结果的差异，海冰算法系数已完成校准。本数据集采用由美国国家航空航天局（NASA）戈达德太空飞行中心（GSFC）冰冻圈科学实验室开发的NASA Team算法生成。
DiGirolamo, N.、Parkinson, C. L.、Cavalieri, D. J.、Gloersen, P. 与 Zwally, H. J.（2022）. 《雨云7号SMMR与DMSP SSM/I-SSMIS被动微波数据中的海冰密集度》.（NSIDC-0051，版本2）. [数据集]. 美国科罗拉多州博尔德市：美国国家航空航天局国家冰雪数据中心分布式主动存档中心. https://doi.org/10.5067/MPYG15WAA4WX. [如适用，请描述所用数据子集]. 数据获取日期：2024年12月9日。