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How anthropogenic climate change will affect hydroclimate in the arid regions of southwestern North America has implications for the allocation of water resources and the course of regional development. Here we show that there is a broad consensus among climate models that this region will dry in the 21st century and that the transition to a more arid(More)
The causes of persistent droughts and wet periods, or pluvials, over western North America are examined in model simulations of the period from 1856 to 2000. The simulations used either (i) global sea surface temperature data as a lower boundary condition or (ii) observed data in just the tropical Pacific and computed the surface ocean temperature elsewhere(More)
1 Contribution number XXXX of Lamont D o h erty E a r t h Observatory. Abstract The c a uses of decadal variations of North P aciic sea surface temperatures (SSTs) are examined using a hindcast performed with an ocean general circulation model thermodynamically coupled to a n a tmospheric mixed layer model (OGCM-AML model) and forced by t he t ime history(More)
Could the Dust Bowl drought of the 1930s have been predicted in advance if the SST anomalies of the 1930s had been foreknown? Ensembles of model simulations forced with historical observed SSTs in the global ocean, and also separately in the tropical Pacific and Atlantic Oceans, are compared with an ensemble begun in January 1929 with modeled atmosphere and(More)
Numerical experiments are performed to examine the causes of variability of Atlantic Ocean SST during the period covered by the National Centers for Environmental Prediction–National Center for Atmospheric Research (NCEP–NCAR) reanalysis (1958–98). Three ocean models are used. Two are mixed layer models: one with a 75-m-deep mixed layer and the other with a(More)
Ocean models are used to investigate how variations in surface heat fluxes and ocean heat transports contribute to variations of tropical Atlantic SSTs on decadal timescales. The observed patterns of variability, deduced from reanalyses of the National Centers for Environmental Prediction (NCEP), are found to involve the ocean's response to variations in(More)
26] Max Lemke and Daniel Quinlan. P++, a C++ virtual shared grids based programming environment for architecture-independent development of structured grid applications.grid representation of emission source clusters in regional air quality modeling. 31] R. Meakin. Moving body overset grid methods for complete aircraft tiltrotor simulations, AIAA-93-3350. A(More)
The mechanisms of changes in the large scale hydrological cycle projected by 15 models participating in the Coupled Model Intercomparison Project 3 and used for the Intergovernmental Panel on Climate Change Assessment Report Four are analyzed by computing differences between 2046-65 and 1961-2000. The contributions to changes in precipitation minus(More)