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Stephen T Gray

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Understanding Extreme Climate Events in the North Central U.S.
The climate of the North Central U.S. is driven by a combination of factors, including atmospheric circulation patterns, the region’s complex topography which extends from the High Rockies to the Great Plains, and variations in hydrology. Together, these factors determine the sustainability of the region’s ecosystems and the services that they provide communities. In order to understand the vulnerability of the region’s ecosystems to change, it is necessary to have reliable projections of future climate conditions. To address this need, researchers first examined past and present variations in climate and assessed the ability of climate models to effectively project future climate conditions for the region. Second,...
Samples from 107 piñon pines (Pinns edulis) at four sites were used to develop a proxy record of annual (June to June) precipitation spanning the 1226 to 2001 AD interval for the Uinta Basin Watershed of northeastern Utah. The reconstruction reveals significant precipitation variability at interannual to decadal scales. Single-year dry events before the instrumental period tended to be more severe than those after 1900. In general, decadal scale dry events were longer and more severe prior to 1900. In particular, dry events in the late 13th, 16th, and 18th Centuries surpass the magnitude and duration of droughts seen in the Uinta Basin after 1900. The last four decades of the 20th Century also represent one of the...
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Alaska CASC
The National and Regional Climate Adaptation Science Centers (CASCs) work with natural and cultural resource managers to gather the scientific information and build the tools needed to help fish, wildlife and ecosystems adapt to the impacts of climate change. The Alaska Climate Adaptation Science Center (AK CASC) is one of nine regional CASCs, managed by the National CASC. The AK CASC is hosted by the University of Alaska Fairbanks (UAF) with the University of Alaska Anchorage (UAA) and the University of Alaska Southeast (UAS) as consortium members. To learn more about the AK CASC, please visit: www.usgs.gov/casc/alaska
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