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As the climate changes, drought may reduce tree productivity and survival across many forest ecosystems; however, the relative influence of specific climate parameters on forest decline is poorly understood. We derive a forest drought-stress index (FDSI) for the southwestern United States using a comprehensive tree-ring data set representing AD 1000–2007.(More)
1 ABSTRACT 7 While projected total precipitation changes in monsoon regions are uncertain, twenty first 8 century climate model projections show an amplification of the annual cycle in tropical pre-9 cipitation with increased strength in both wet and dry seasons. New analysis of World Cli-10 mate Research Program (WCRP) Coupled Model Intercomparison Project(More)
Twenty-first century climate model projections show an amplification of the annual cycle in tropical precipitation with increased strength in both wet and dry seasons, but uncertainty is large and few studies have examined transition seasons. Here we analyze coupled climate model projections of global land monsoons and show a redistribution of precipitation(More)
The accurate assessment of the potential impacts of climate change on societies and ecosystems requires regional and local-scale climate change information. This assessment is critical for the development of local, national, and international policies to mitigate and adapt to the threat of climate change. Characterizing uncertainties in regional climate(More)
The purposes of this paper are to evaluate the new version of the regional model, RegCM3, over South America for two test seasons, and to select a domain for use in an experimental nested prediction system, which incorporates RegCM3 and the European Community-Hamburg (ECHAM) general circulation model (GCM). To evaluate RegCM3, control experiments were(More)
Globally, forests store ∼45% of carbon sequestered terrestrially, contribute more to the terrestrial sink per area than any other land cover type, and assimilate an important portion of anthropogenic emissions (Bonan, 2008). Forests exert strong biophysical control on climate via surface energy balance Brown et al., 2005). Widespread forest mortality in(More)
The potential of an experimental nested prediction system to improve the simulation of subseasonal rainfall statistics including daily precipitation intensity, rainy season onset and withdrawal, and the frequency and duration of dry spells is evaluated by examining a four-member ensemble of regional climate model simulations performed for the period(More)
2014. Effects of population characteristics and structure on estimates of effective population size in a house sparrow metapopulation. Molecular Ecology. 23: 2653-2668. (Peer reviewed report with data from: Baalsrud, H.T. 2011. Population characteristics and estimates of effective population size in a house sparrow metapopulation. Thesis.
A nonuniform, fast Fourier transform can be used to reduce the computational cost of the empirical characteristic function (ECF) by a factor of 100. This fast ECF calculation method is applied to a new, objective, and robust method for estimating the probability distribution of univariate data, which effectively modulates and filters the ECF of a dataset in(More)
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