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The Standardized Precipitation Evapotranspiration Index (SPEI) was computed based on the monthly precipitation and air temperature values at 609 locations over China during the period 1951–2010.Various characteristics of drought across China were examined including: long-term trends, percentage of area affected, intensity, duration, and drought frequency.(More)
America: placing IPCC projections of hydroclimatic change in a long-term palaeoclimate context. ABSTRACT: IPCC Assessment Report 4 model projections suggest that the subtropical dry zones of the world will both dry and expand poleward in the future due to greenhouse warming. The US Southwest is particularly vulnerable in this regard and model projections(More)
For further information, please e-mail climateindicators@epa.gov or call the EPA Climate Change Division hotline at 202-343-9990. ii This report reflects the contributions of multiple individuals. Jason Samenow of EPA served as the report's day-today project manager, with key assistance from Kevin Rosseel. Eastern Research Group, Inc., under contract to(More)
[ 1 ] Ancient Montezuma baldcypress (Taxodium mucronatum) trees found in Barranca de Amealco, Queretaro, have been used to develop a 1,238‐year tree‐ ring chronology that is correlated with precipitation, temperature, drought indices, and crop yields in central Mexico. This chronology has been used to reconstruct the spring‐early summer soil moisture(More)
Climate models with enhanced greenhouse gas concentrations have projected temperature increases of 2 degrees to 4 degrees C, winter precipitation increases of up to 15 percent, and summer precipitation decreases of 5 to 10 percent in the central United States by the year 2030. An analysis of the climate record over the past 95 years for this region was(More)
The international scientific community has long recognized the need for coordinated drought monitoring and response, but many factors have prevented progress in the development of a Global Drought Early Warning System (GDEWS): some of which involve administrative issues (coordinated international action and policy) while others involve scientific,(More)
NASA's Gravity Recovery and Climate Experiment (GRACE) satellites measure time variations of the Earth's gravity field enabling reliable detection of spatio-temporal variations in total terrestrial water storage (TWS), including groundwater. The U.S. and North American Drought Monitors are two of the premier drought monitoring products available to(More)