Reply to comment by Keith J. Beven and Hannah L. Cloke on â Hyperresolution global land surface modeling: Meeting a grand challenge for monitoring Earth's terrestrial waterâ

摘要: [1] The authors of Wood et al.[2011, hereafter W2011] would like to thank Beven and Cloke [2012, hereafter BC2012] for furthering the discussion about the pathway toward a global-scale hyper-resolution water-energy-biogeochemistry land surface modeling capability: its need, feasibility and development. Their comment brings focus to the discussion and shows that the proposed challenge to our community is one element in a long history of hydrology model developments with the goal to improving hydrologic predictions and understanding.[2] What is laid out in W2011 is, first and foremost, a grand challenge because (1) there is a grand need,(2) there are great new opportunities, and (3) if the hydrologic community does not do it someone else will do it, albeit poorly. The reader is directed to W2011 for a discussion of the growing need for continental-scale land surface models that consider improved, scale-appropriate parameterizations of the water, energy and biogeochemical cycles at resolutions on the order of 102 to 103 m grid resolutions. Some examples are presented, which were not meant be to comprehensive in their scope of detail, that include surface-subsurface interactions, land-atmospheric interactions and coupling, water quality that includes nonpoint pollution, and human impacts that include water management, land cover change and the effects of climate change.[3] The commentary by BC2012 focuses on just one challenge or building block described in W2011: the issue of parameterization of subgrid heterogeneity and the resulting uncertainty—what they refer to as ‘‘epistemic uncertainty.’’BC2012 interprets the Grand …