National Snow and Ice Data Center Sea Ice Index

美国国家雪冰数据中心海冰指数是一个提供北极和南极海冰变化数据的数据库，包含自1979年以来一致处理的海冰范围和浓度图像及数据值。该数据库提供日度和月度海冰指数数据，包括海冰范围、浓度、异常值和趋势分析，是研究极地海冰变化的重要数据源。The Sea Ice Index from the U.S. National Snow and Ice Data Center (NSIDC) is a database providing data on sea ice changes in the Arctic and Antarctic regions. It contains consistently processed sea ice extent and concentration imagery as well as corresponding data values since 1979. This database offers daily and monthly sea ice index datasets, including sea ice extent, concentration, anomalies, and trend analysis results, and serves as a critical data source for research on polar sea ice changes.