variant_labels定义在[CMIP6数据参考语法(DRS)][1]文档并由realization_index, initialization_index, physics_index forcing_index。这个链接DRS文档可以例如被发现在[CMIP6参与建模指南][2]。[1]https://docs.google.com/document/d/1h0r8RZr_f3-8egBMMh7aqLwy3snpD6_MrDz1q8n5XUk/edit [2]: https://pcmdi.llnl.gov/CMIP6/Guide/modelers.html