Identifying Challenges and Opportunities for Earth System reanalyses



[1] Evaluation of Reanalyses—Developing an Integrated Earth System Analysis (IESA) Capability; Baltimore, Maryland, 1–3 November 2010; Understanding how Earth system components and their interactions are changing over time is crucial to developing national strategies for managing climate risk. Despite vast improvements in observational capabilities, observations alone are, and will continue to be, insufficient to fully determine the present state of the atmosphere, much less quantify the states of other components of the Earth system such as the ocean, land surface, cryosphere, and biosphere. Thus, a fundamental scientific challenge remains: obtaining optimal estimates of past and present climate and, more generally, of the full Earth system. This will help researchers to determine how and why changes are occurring and to assess the associated impacts.