A national Arctic research project of “Japan's national project of Arctic Challenge for Sustainability (ArCS)” finished in March 2020. A special issue for ArCS was prepared to summarize performances of ArCS through fourteen invited articles that were reviewed activities and achievements of ArCS. In this Editorial, major facts and the structure of ArCS are shown. Also, each invited article is introduced briefly with its individual characteristics within the whole ArCS research system.

中文翻译：

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北极可持续发展挑战（ArCS）项目

一项名为“日本国家可持续性北极挑战国家项目（ArCS）”的国家北极研究项目于2020年3月结束。准备了《 ARCS特刊》，通过十四篇受邀文章对ArCS的表现进行了总结，这些文章对ArCS的活动和成就进行了综述。在本社论中，显示了ArCS的主要事实和结构。另外，在整个ArCS研究系统中，每篇受邀的文章都将以其独特的特征进行简要​​介绍。