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Responding to Drought and Water Challenges
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Coldwater Fisheries and Climate Adaptation Case Studies in the Western and Eastern United States.
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News & Events
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Events
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Scientists: Strong evidence that human-caused climate change intensified 2015 heat waves
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Human-caused climate change very likely increased the severity of heat waves that plagued India, Pakistan, Europe, East Africa, East Asia, and Australia in 2015 and helped make it the warmest year on record, according to new research published today in a special edition of the Bulletin of the American Meteorological Society.
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News & Events
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Significant anthropogenic-induced changes of climate classes since 1950
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Anthropogenic forcings have contributed to global and regional warming in the last few decades and likely affected terrestrial precipitation. Here we examine changes in major Köppen climate classes from gridded observed data and their uncertainties due to internal climate variability using control simulations from Coupled Model Intercomparison Project 5 (CMIP5). About 5.7% of the global total land area has shifted toward warmer and drier climate types from 1950–2010, and significant changes include expansion of arid and high-latitude continental climate zones, shrinkage in polar and midlatitude continental climates, poleward shifts in temperate, continental and polar climates, and increasing average elevation of tropical and polar climates. Using CMIP5 multi-model averaged historical simulations forced by observed anthropogenic and natural, or natural only, forcing components, we find that these changes of climate types since 1950 cannot be explained as natural variations but are driven by anthropogenic factors.
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Resources
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Climate Science Documents
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Too late for two degrees? Low carbon economy index 2012
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Even doubling our current rate of decarbonisation would still lead to emissions consistent with 6 degrees of
warming by the end of the century. To give ourselves a more than 50% chance of avoiding 2 degrees will
require a six-fold improvement in our rate of decarbonisation.
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Resources
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Climate Science Documents
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Tree mortality predicted from drought-induced vascular damage
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The projected responses of forest ecosystems to warming and drying associated with twenty-first-century climate change vary widely from resiliency to widespread tree mortality (1–3). Current vegetation models lack the ability to account for mortality of overstory trees during extreme drought owing to uncertainties in mechanisms and thresholds causing mortality (4,5). Here we assess the causes of tree mortality, using field measurements of branch hydraulic conductivity during ongoing mortality in Populus tremuloides in the southwestern United States and a detailed plant hydraulics model. We identify a lethal plant water stress threshold that corresponds with a loss of vascular transport capacity from air entry into the xylem. We then use this hydraulic-based threshold to simulate forest dieback during historical drought, and compare predictions against three independent mortality data sets. The hydraulic threshold predicted with 75% accuracy regional patterns of tree mortality as found in field plots and mortality maps derived from Landsat imagery. In a high-emissions scenario, climate models project that drought stress will exceed the observed mortality threshold in the southwestern United States by the 2050s. Our approach provides a powerful and tractable way of incorporating tree mortality into vegetation models to resolve uncertainty over the fate of forest ecosystems in a changing climate.
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Resources
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Climate Science Documents
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Tribal Nation Boundary Feature on Drought Maps
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NIDIS, in partnership with NOAA's National Centers for Environmental Information, has launched a new map customization feature for Tribal Nations on the Drought.gov. This feature allows users to display reservation boundaries on any map on Drought.gov.
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Resources
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Climate Links
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U.S. Climate Summary for October 2022
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NOAA National Centers for Environmental Information released the agency’s October 2022 climate summary this week. Below are some highlights.
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News and Webinars
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What is Ecological Drought? Exploring its impacts on natural and cultural resources
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In 2017 the National Climate Change and Wildlife Science Center (NCCWSC), in partnership with the National Conservation Training Center (NCTC), will be dedicating their webinar series to ecological drought with presentations from NCCWSC and the DOI Climate Science Centers (CSCs).
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News & Events
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Events
