In the context of fund reform in the new era, the National Natural Science Foundation of China has optimized the discipline layout and application codes. Under the new application code scheme implemented in 2020, the discipline of atmospheric sciences has 15 secondary application codes under the three major sections of “branch disciplines”, “supporting technologies” and “development fields”. In this paper, we interpret the research directions and keywords under the secondary application code D0513, “Climate Change, Its Impacts and Countermeasures,” and analyze the use of keywords and research hotspots under this application code by combining bibliometric methods and application data. As an application code of the “development fields” section, “Climate Change, Its Impacts and Countermeasures” focuses on the major needs of national and social development, and the research directions and keywords under this application code reflect a scientific, inclusive, and leading nature. With the increasing concern of society regarding climate change, research in this field is developing rapidly, and hot spots are emerging. This paper aims to help scholars grasp the development trend of the discipline, recognize the meaning of the D0513 application code and its research directions and keywords, and select them accurately in fund applications.