Posts tagged climate change
Climate change could dry up Salt Lake City watersheds
Nov 1st
challenge Salt Lake City’s water supply
In an example of the challenges water-strapped Western cities will face in a warming world, new research shows that every degree Fahrenheit of warming in the Salt Lake City region could mean a 1.8 to 6.5 percent drop in the annual flow of streams that provide water to the city.
By midcentury, warming Western temperatures may mean that some of the creeks and streams that help slake Salt Lake City’s thirst will dry up several weeks earlier in the summer and fall, according to the new paper, published today in the journal Earth Interactions. The findings may help regional planners make choices about long-term investments, including water storage and even land-protection policies.
“Many Western water suppliers are aware that climate change will have impacts, but they don’t have detailed information that can help them plan for the future,” said lead author Tim Bardsley, with NOAA’s Cooperative Institute for Research in Environmental Sciences (CIRES) at the University of Colorado Boulder. “Because our research team included hydrologists, climate scientists and water utility experts, we could dig into the issues that mattered most to the operators responsible for making sure clean water flows through taps and sprinklers without interruption.”
Bardsley works for the CIRES Western Water Assessment, from the NOAA Colorado Basin River Forecast Center in Salt Lake City. For the new paper, he worked closely with colleagues from the city’s water utility, the National Center for Atmospheric Research (NCAR), NOAA’s Earth System Research Laboratory and the University of Utah.
The team relied on climate model projections of temperature and precipitation in the area, historical data analysis and a detailed understanding of the region from which the city utility obtains water. The study also used NOAA streamflow forecasting models that provide information for Salt Lake City’s current water operations and management.
The picture that emerged was similar, in some ways, to previous research on the water in the Interior West: Warmer temperatures alone will cause more of the region’s precipitation to fall as rain than snow, leading to earlier runoff and less water in creeks and streams in the late summer and fall.
“Many snow-dependent regions follow a consistent pattern in responding to warming, but it’s important to drill down further to understand the sensitivity of watersheds that matter for individual water supply systems,” said NCAR’s Andy Wood, a co-author.
The specifics in the new analysis—which creeks are likely to be impacted most and soonest, how water sources on the nearby western flank of the Wasatch Mountains and the more distant eastern flank will fare—are critical to water managers with Salt Lake City.
“We are using the findings of this sensitivity analysis to better understand the range of impacts we might experience under climate change scenarios,” said co-author Laura Briefer, water resources manager at the Salt Lake City Department of Public Utilities. “This is the kind of tool we need to help us adapt to a changing climate, anticipate future changes and make sound water-resource decisions.”
“Water emanating from our local Wasatch Mountains is the lifeblood of the Salt Lake Valley, and is vulnerable to the projected changes in climate,” said Salt Lake City Mayor Ralph Becker. “This study, along with other climate adaptation work Salt Lake City is doing, helps us plan to be a more resilient community in a time of climate change.”
Among the details in the new assessment:
- Temperatures are already rising in northern Utah, about 2 degrees Fahrenheit in the last century, and continue to climb. Summer temperatures have increased especially steeply and are expected to continue to do so. Increasing temperatures during the summer irrigation season may increase water demand.
- Every increase in a degree Fahrenheit means an average decrease of 3.8 percent in annual water flow from watersheds used by Salt Lake City. This means less water available from Salt Lake City’s watersheds in the future.
- Lower-elevation streams are more sensitive to increasing temperatures, especially from May through September, and city water experts may need to rely on less-sensitive, higher-elevation sources in late summer, or more water storage.
- Models tell an uncertain story about total future precipitation in the region, primarily because Utah is on the boundary of the Southwest (projected to dry) and the U.S. northern tier states (projected to get wetter).
- Overall, models suggest increased winter flows, when water demand is lower, and decreased summer flows when water demand peaks.
- Annual precipitation would need to increase by about 10 percent to counteract the stream-drying effect of a 5-degree increase in temperature.
- A 5-degree temperature increase would also mean that peak water flow in the western Wasatch creeks would occur two to four weeks earlier in the summer than it does today. This earlier stream runoff will make it more difficult to meet water demand as the summer irrigation season progresses.
Authors of the new paper, “Planning for an Uncertain Future: Climate Change Sensitivity Assessment Toward Adaptation Planning for Public Water Supply,” are Tim Bardsley, CIRES Western Water Assessment; Andrew Wood, NCAR and formerly of NOAA’s Colorado Basin River Forecast Center; Mike Hobbins, NOAA’s Earth System Research Laboratory, and formerly NOAA’s Colorado Basin River Forecast Center; Tracie Kirkham, Laura Briefer, and Jeff Niermeyer, Salt Lake City Department of Public Utilities, Salt Lake City, Utah; and Steven Burian, University of Utah, Salt Lake City.
Earth Interactions is jointly published by the American Geophysical Union, the American Meteorological Society and the Association of American Geographers.
CIRES is a joint institute of NOAA and CU-Boulder.
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Boulder County’s moratorium on oil and gas drilling permits is scheduled to expire on June 10
May 4th
TAKE ACTION: Contact the County Commissioners @ commissioners@bouldercounty.org to ask for a multi-year moratorium on fracking until we have results of neutral health impact research such as the National Science Foundation study due in 2018. Before issuing any oil and gas drilling permits, we need to first know the public safety impacts of hydraulic fracturing.
A multi-year moratorium based on the need for health impact studies on fracking would allow time for the results of medical and scientific studies now in the works to be finalized, including a 5-year $12 million study funded by the National Science Foundation (NSF) being coordinated by the University of Colorado at Boulder, an EPA study on “Potential Impacts of Hydraulic Fracturing on Drinking Water Resources,” and a multi-year study by the Colorado Department of Public Health and Environment with Colorado State University.
Your personal email will make a difference.
Thank you for your help!
Boulder County Recognized for its Leadership on Reducing Carbon Pollution and Addressing Climate Change
Feb 28th
Boulder County awarded a 2013 Organizational Leadership Award as part of the annual the Climate Leadership Awards sponsored by EPA and other leading climate change organizations
Boulder County, Colo. – Boulder County is pleased to be among fewer than a handful of local governments recognized for its leadership and innovation around the issue of climate change and clean energy.
Today it was announced by the EPA’s Climate Protection Partnerships Division and its co-sponsors, The Climate Registry (The Registry), the Center for Climate and Energy Solutions (C2ES), and the Association of Climate Change Officers (ACCO), that Boulder County is a winner of the 2013 Organizational Leadership Award as part of the annual the Climate Leadership Awards (CLA).
The CLA is a national awards program that recognizes and encourages exemplary corporate, organizational, and individual leadership in reducing carbon pollution and addressing climate change. Award winners must demonstrate leadership in reducing greenhouse gas emissions in internal operations and throughout the supply chain, as well as integrating climate resilience into their operating strategies.
“We are thrilled to be recognized for the work of our staff and our partners throughout the community who have made it their tireless priority to engage residents of Boulder County in activities and actions that have led to real change on behalf of the environment and reducing our carbon footprint countywide,” said Cindy Domenico, Chair of the Boulder County Commissioners. “Whether it be in the realm of energy efficiency, transportation, Zero Waste, residential and commercial building retrofits, or significant investments in renewable energy options, we’re proud to be on the leading edge of innovation in these areas.”
This year’s awards mark a noteworthy increase in public-sector city and county engagement, a priority effort that Boulder County has championed in collaboration with its municipal partners since the creation of the county’s Sustainability Initiative in 2005.
“It is an honor to receive recognition for the commitment that our past and present County Commissioners and sustainability staff have made to a healthier and more environmentally sustainable place to live,” said Boulder County Sustainability Coordinator, Susie Strife. “This award is a reflection of the hard work, progressive decision making and leadership of Boulder County and the collaborative partnership with all of our municipalities, in particular the Cities of Boulder and Longmont.”
Programs like EnergySmart, Boulder County’s Energy Efficiency service, are helping Boulder County reduce greenhouse gas emissions from existing buildings. EnergySmart has helped over 8,600 homes and 2,400 businesses with energy efficiency upgrades.
In addition to reducing greenhouse gas emissions, EnergySmart is stimulating the local economy with over $16 million in energy efficiency upgrades and advancing the state’s energy independence. EnergySmart is a collaborative partnership throughout Boulder County, and is funded by seed funding from the Department of Energy’s BetterBuildings Program, combined with contributions from the City of Boulder’s Climate Action Plan tax and the City of Longmont.
Other demonstrations of the county’s forward thinking actions include the development of the Climate Change Preparedness Plan, blueprints for action around sustainability and energy efficiency, and the county’s recently completed Transportation Master Plan which identifies programs, services, and facilities that Boulder County will implement to help people get where they need to go in the future in a safe, efficient, and environmentally sensitive manner.
The CLA awards will be presented tonight at the Climate Leadership Conference in Washington, D.C.
More information about the awards and award winners is available at epa.gov/climateleadership/awards/ or through the EPA’s news release.
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