and plan common strategies for effective collaboration. Modelers can learn about each others’ progress at conferences and through scholarly journals, but for a diverse and decentralized community, this can be slow, haphazard, and inefficient. For this purpose, the committee recommends the establishment of an annual “U.S. Climate Modeling Forum,” in which scientists engaged in both global and regional climate model development and analysis from across the United States, as well as interested users, would gather to focus on timely and important cross-cutting issues related to U.S. climate modeling. While NCAR hosts an annual Community Earth System Model (CESM) meeting that is widely attended, it is largely focused on the needs of its own global modeling activities and would not be ideal for the broader purposes the committee envisions. The proposed National Climate Modeling Forums would provide regular interactions between scientists from the various U.S. regional and global modeling activities, including operational modeling. The Forum should also include end users of climate model output. The committee recognizes that one meeting may not be able to meet all the goals that are set forth below, and there will need to be experimentation about how to design a Forum that is most effective as a community-building institution for climate modeling and its applications.

The proposed Forum would, at a minimum, provide a periodic synthesis of current U.S. climate modeling capabilities and an opportunity for community discussion of nearterm plans. It would also provide a venue for wide-ranging communication across a spectrum of climate model developers and users of climate model information. In the spirit of favoring a science-motivated grassroots approach, the Forum would provide the opportunity for the community to work together in ways that make sense at the scientific level, but which are sometimes difficult to anticipate in detail or to prescribe in advance. The Forum would

•  serve as an important mechanism for informing the community of the current and planned activities at core modeling centers and regional modeling efforts;

•  provide an important venue for fostering interactions among scientists in the core modeling efforts, regional modeling efforts, and other institutions including universities;

•  facilitate a more coordinated approach to global and regional model development and use in the United States; this approach would likely include the design of common experiments using multiple models that seek to improve our understanding and representation of key climate processes, and sharing the results and analyses of such experiments, as well as the formation of joint development teams to focus on addressing limiting biases or shortcomings in the current generation of models in the spirit of the current U.S. CPT approach, funded through multiagency competitively awarded grants;

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