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Geophysical Fluid Dynamics Laboratory Review

This review highlights the objectives and findings of the USGS project at GFDL, focusing on improved representation of hydrologic processes in climate models, understanding of hydrology-climate connections, and the impacts of terrestrial water on the climate system. The review also discusses the projected changes in freshwater availability and the influence of land water storage on climate models. The article concludes by mentioning the research areas that will be supported by the LM3 model.

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Geophysical Fluid Dynamics Laboratory Review

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  1. Geophysical Fluid Dynamics LaboratoryReview June 30 - July 2, 2009

  2. Research on Hydrology, Water Resources and Climate at GFDL Presented by Christopher Milly

  3. Objectives of USGS project at GFDL • Improved representation of hydrologic processes in GFDL climate models • Improved understanding of hydrology-climate connections • Climatic controls of hydrologic variability and change • Terrestrial water influences on the climate system • Human dimension: water resources, flooding, drought 3

  4. AR4 models skillfully reproduced global pattern of historical streamflow trends Normalized trend in streamflow,20th century(local z statistic) • stream gauges • AR4 models (Milly et al., 2005) 4

  5. AR4 models project changing freshwater availability Projected change in runoff by mid 21st century (%) median response of 12 AR4 models to SRES A1B scenario (Milly et al., 2008) 5

  6. Land water-storage bias in CM2.1 was revealed, influencing LM3 developments Amplitude of annual cycle of land water storage (mm) • GRACE Observations • GFDL CM2.1 0 7 30 69 123 193 278 (Swenson and Milly, 2006) amplitude (mm) 6

  7. Looking ahead: LM3 will support new research • Research Areas • Water availability, variability, and scale • Vegetation, climate, and hydrologic change • Water development as driver of climate change • Aquatic environment • Seasonal soil freezing and permafrost • Sea-level variability 7

  8. Geophysical Fluid Dynamics LaboratoryReview June 30 - July 2, 2009

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