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Hydrologic Cycle Response to Anthropogenic Forcing

PI: Michael Previdi
Institution: Columbia University
Abstract:
This project will examine changes in the hydrologic cycle in large-scale atmospheric reanalyses and IPCC runs for the twentieth century and for possible future climate scenarios. Focus will be given to understanding observed global and regional scale variations in precipitation minus evaporation (P-E), and associated changes in atmospheric moisture flux divergence. The role of human activity in producing the observed water cycle changes will be assessed by evaluating IPCC model runs for the twentieth century that include various anthropogenic forcings. Additionally, possible future changes in P-E and atmospheric moisture transport will be examined using IPCC 21st century simulations. Particular attention will be given to the effect of changes in anthropogenic aerosol emissions on water cycle response, and to the intermodel robustness of this response.
Publications:
  • Liepert, B. G., and M. Previdi, 2008: Do models and observations disagree on the rainfall response to global warming?. J. Clim.. Submitted. Abstract. Edit.
  • Previdi, M., and B. G. Liepert, 2007: Annular modes and Hadley cell expansion under global warming. Geophys. Res. Lett., 34, L22701, doi:10.1029/2007GL031243. Abstract. Edit.
  • Previdi, M., and B. G. Liepert, 2008: Interdecadal variability of rainfall on a warming planet. Eos Trans. AGU, 89, 193, 195, doi:10.1029/2007ES002028. Abstract. Edit.

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