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Date Name of Mee+ng
Climate Change in the United States
Third Na)onal Climate Assessment
Philip MoteOregon State University
NCA steering commi>ee member and author
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Date Name of Mee+ng
The NCA Process
Inclusive, broader exper+se 300 authors 60 member Federal Advisory Commi>eePublic engagement Listening sessions around the country Request for informa+on, input reportsFocus on sustained assessment Intermediate products planned as well as quadrennial reports
Kathy Jacobs
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Date Name of Mee+ng
The NCA Process, con+nuedNew topics covered Oceans, Coasts, Urban, Rural, Land use Cross-‐sector links like Energy/Water/LandNew format Digital products and interac+ve website Highlights, Global Change Info Service, traceable accountsExtensive Review Na+onal Academy of Sciences, agencies, public review, responses to all comments
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Date Name of Mee+ng
Human-‐induced climate change has moved firmly into the present
© Dave M
ar+n/AP/Corbis
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Date Name of Mee+ng
Americans are already feeling the effects of increases in some types of extreme weather
and sea level rise© Stan Honda/AFP/Ge>
y Images
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Date Name of Mee+ng
Impacts are apparent in every region and in important sectors including health, water,
agriculture, energy, and more© Sco>
Olson/Ge>
y Images
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Date Name of Mee+ng
There are many ac+ons we can take to reduce future climate change and its impacts and to
prepare for the impacts we can’t avoid
©Dennis Schroeder, N
REL
©Esperanza Stancioff, U
Maine Extension and M
aine Sea Grant
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Date Name of Mee+ng
The World is Warming
Numerous independent lines of evidence demonstrate that warming has con+nued.
Because human-‐induced warming is super-‐imposed on a naturally varying climate, rising temperatures are not evenly distributed across the globe or over +me.
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Ten Indicators of A Warming World
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from climate chapter
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from climate chapter
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Date Name of Mee+ng
Human ac+vity is the primary cause
©Tom
Mihalek/Reuters/Corbis
© Phillip J. Redm
an, U.S. Geological Survey
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Date Name of Mee+ng
Carbon Emissions in the Industrial Age
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23 CLIMATE CHANGE IMPACTS IN THE UNITED STATES
2: OUR CHANGING CLIMATE
relevant indicators such as growing season length have been observed in many areas. Worldwide, the observed changes in aver-age conditions have been accompanied by increasing trends in extremes of heat and heavy precipitation events, and decreases in extreme cold.4
Natural drivers of climate cannot explain the recent observed warming. Over the last five decades, natural factors (solar forcing and volcanoes) alone would actu-ally have led to a slight cooling (see Figure 2.3).5
The majority of the warming at the global scale over the past 50 years can only be explained by the effects of human influ-ences,5,6,7 especially the emissions from burning fossil fuels (coal, oil, and natural gas) and from deforestation. The emis-sions from human influences that are affecting climate include heat-trapping gases such as carbon dioxide (CO2), meth-ane, and nitrous oxide, and particles such as black carbon (soot), which has a warm-ing influence, and sulfates, which have an overall cooling influence (see Appendix 3: Climate Science Supplement for further discussion).8,9 In addition to human-in-duced global climate change, local climate can also be affected by other human fac-tors (such as crop irrigation) and natural variability (for example, Ashley et al. 2012; DeAngelis et al. 2010; Degu et al. 2011; Lo and Famiglietti 201310).
The conclusion that human influences are the primary driver of recent climate change is based on multiple lines of independent evidence. The first line of evidence is our fundamental understanding of how certain gases trap heat, how the climate system responds to increases in these gases, and how other human and natural factors influence climate. The second line of evidence is from reconstructions of past climates using evidence such as tree rings, ice cores, and corals. These show that global surface temperatures over the last several decades are clearly unusual, with the last decade (2000-2009) warmer than any time in at least the last 1300 years and perhaps much longer.11
Figure 2.2. Global annual average temperature (as measured over both land and oceans) has increased by more than 1.5°F (0.8°C) since 1880 (through 2012). Red bars show temperatures above the long-term average, and blue bars indicate temperatures below the long-term average. The black line shows atmospheric carbon dioxide (CO
2)
concentration in parts per million (ppm). While there is a clear long-term global warming trend, some years do not show a temperature increase relative to the previous year, and some years show greater changes than others. These year-to-year fluctuations in temperature are due to natural processes, such as the effects of El Niños, La Niñas, and volcanic eruptions. (Figure source: updated from Karl et al. 20091).
Global Temperature and Carbon Dioxide
Figure 2.3. Observed global average changes (black line), model simulations using only changes in natural factors (solar and volcanic) in green, and model simulations with the addition of human-induced emissions (blue). Climate changes since 1950 cannot be explained by natural factors or variability, and can only be explained by human factors. (Figure source: adapted from Huber and Knutti29).
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Final version pg 23
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Date Name of Mee+ng
Future Climate Change Depends Primarily on Emissions Levels
© Jim
West/im
agebroker/Corbis
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16
495
Climate Change Impacts in the United States
CHAPTER 21NORTHWEST
INFORMATION DRAWN FROM THIS CHAPTER IS INCLUDED IN THE HIGHLIGHTS REPORT AND IS IDENTIFIED BY THIS ICON
Recommended Citation for Chapter
Mote, P., A. K. Snover, S. Capalbo, S. D. Eigenbrode, P. Glick, J. Littell, R. Raymondi, and S. Reeder, 2014: Ch. 21: North-
west. Climate Change Impacts in the United States: The Third National Climate Assessment, J. M. Melillo, Terese (T.C.) Rich-
mond, and G. W. Yohe, Eds., U.S. Global Change Research Program, 16–1-nn.
ISBN
On the Web: http://nca2014.globalchange.gov/report/regions/northwest
Convening Lead Authors
Philip Mote, Oregon State University
Amy K. Snover, University of Washington
Lead AuthorsSusan Capalbo, Oregon State University
Sanford D. Eigenbrode, University of Idaho
Patty Glick, National Wildlife Federation
Jeremy Littell, U.S. Geological Survey
Richard Raymondi, Idaho Department of Water Resources
Spencer Reeder, Cascadia Consulting Group
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17
496 CLIMATE CHANGE IMPACTS IN THE UNITED STATES
NORTHWEST21KEY MESSAGES1. Changes in the timing of streamflow related to changing snowmelt are already observed and will
continue, reducing the supply of water for many competing demands and causing far-reaching ecological and socioeconomic consequences.
2. In the coastal zone, the effects of sea level rise, erosion, inundation, threats to infrastructure and habitat, and increasing ocean acidity collectively pose a major threat to the region.
3. The combined impacts of increasing wildfire, insect outbreaks, and tree diseases are already causing widespread tree die-off and are virtually certain to cause additional forest mortality by the 2040s and long-term transformation of forest landscapes. Under higher emissions scenarios, extensive conversion of subalpine forests to other forest types is projected by the 2080s.
4. While the agriculture sector’s technical ability to adapt to changing conditions can offset some adverse impacts of a changing climate, there remain critical concerns for agriculture with respect to costs of adaptation, development of more climate resilient technologies and management, and availability and timing of water.
With craggy shorelines, volcanic mountains, and high sage deserts, the Northwest’s complex and varied topography contributes to the region’s rich climatic, geographic, social, and ecologic diversity. Abundant natural resources – timber, fisheries, productive soils, and plentiful water – remain important to the region’s economy.
Snow accumulates in mountains, melting in spring to power both the region’s rivers and economy, creating enough hydropower (40% of national total)1 to export 2 to 6 million megawatt hours per month.2 Snowmelt waters crops in the dry interior, helping the region produce tree fruit (number one in the world) and almost $17 billion worth of agricultural commodities, including 55% of potato, 15% of wheat, and 11% of milk production in the United States.3
Seasonal water patterns shape the life cycles of the region’s flora and fauna, including iconic salmon and steelhead, and forested ecosystems, which cover 47% of the landscape.4 Along more than 4,400 miles of coastline, regional economic centers are juxtaposed with diverse habitats and ecosystems that support thousands of species of fish and wildlife, including commercial fish and shellfish resources valued at $480 million in 2011.5
Adding to the influence of climate, human activities have altered natural habitats, threatened species, and extracted so much water that there are already conflicts among multiple
users in dry years. More recently, efforts have multiplied to balance environmental restoration and economic growth while evaluating climate risks. As conflicts and tradeoffs increase, the region’s population continues to grow, and the regional consequences of climate change continue to unfold. The need to seek solutions to these conflicts is becoming increasingly urgent.
The Northwest’s economy, infrastructure, natural systems, public health, and vitally important agriculture sector all face important climate change related risks. Those risks – and possible adaptive responses – will vary significantly across the region.6 Impacts on infrastructure, natural systems, human health, and economic sectors, combined with issues of social and ecological vulnerability, will play out quite differently in largely natural areas, like the Cascade Range or Crater Lake National Park, than in urban areas like Seattle and Portland (Ch. 11: Urban),7 or among the region’s many Native American tribes, like the Umatilla or the Quinault (Ch. 12: Indigenous Peoples).8
As climatic conditions diverge from those that determined patterns of development and resource use in the last century, and as demographic, economic, and technological changes also stress local systems, efforts to cope with climate change would benefit from an evolving, iterative risk management approach.9
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Edited by:
Meghan M. Dalton
Philip W. Mote
Amy K. Snover
C!"#$%& C'$()& "( %'& N*+%',&-%Implications for Our Landscapes, Waters, and Communities
30 authors, 2+ countries, 601
review comments
occri.net/reports
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Dalton et al. Fig 2.5a
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Changes in extreme precipitation (North American Climate
Change Assessment Project)
Dalton et al. Fig 2.9
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Future climate
•Warming already underway; will be warmer in all seasons, how much is uncertain
•Beyond ~2040, amount of warming depends on GHG emissions now
•Precipitation changes likely to be indistinguishable from natural variability, except possibly drying summers
•Summer likely to warm more than other seasons
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Decreasing summer flow in snowmelt watersheds
NCA Fig 21.1
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NCA Fig 21.2b
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FINAL (3.3.09) – Page 60
Figure 8. Projected average monthly streamflow for a rain dominant watershed (Chehalis
River at Porter), transient rain-snow watershed (Yakima River at Parker), and snowmelt
dominant watershed (Columbia River at The Dalles). Hydrographs represent monthly
averages of simulated daily streamflow by the VIC model for the historic period (1916-
2006) and three future periods (2020s, 2040s, and 2080s) using the A1B SRES scenario.
FINAL (3.3.09) – Page 60
Figure 8. Projected average monthly streamflow for a rain dominant watershed (Chehalis
River at Porter), transient rain-snow watershed (Yakima River at Parker), and snowmelt
dominant watershed (Columbia River at The Dalles). Hydrographs represent monthly
averages of simulated daily streamflow by the VIC model for the historic period (1916-
2006) and three future periods (2020s, 2040s, and 2080s) using the A1B SRES scenario.
Dello, OCCRI; Hamlet, UWlike NCA Fig 21.2a
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water
•Effects of warming already apparent in many basins: earlier snowmelt, lower summer flow
•Largest future changes in summer flow will be in mild snowy basins
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Fig 21.3
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Risks to forests
Fig 21.7a
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For 2.2°F global warming
Fig 21.7b
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Main concerns
•Loss of timber production
•Loss of subalpine forests
•Air quality - health effects
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Agriculture•Longer growing
season
•Drought stress
•CO2 fertilization
•Chilling requirements
•Pests
FINAL (3.3.09) – Page 60
Figure 8. Projected average monthly streamflow for a rain dominant watershed (Chehalis
River at Porter), transient rain-snow watershed (Yakima River at Parker), and snowmelt
dominant watershed (Columbia River at The Dalles). Hydrographs represent monthly
averages of simulated daily streamflow by the VIC model for the historic period (1916-
2006) and three future periods (2020s, 2040s, and 2080s) using the A1B SRES scenario.
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Impacts on agriculture
! 12!
Milk%and%dairy,%%$3.1%%
Ca1le%and%calves,%%$2.9%%
Fruits,%%nuts%and%berries,%%%
$2.6%%
Grains,%oilseeds,%dry%beans,%%$2.1%%
Vegetables,%%$1.9%%
Other%crops%%and%hay,%%$1.9%%
Nursery,%%$1.4%%
Other%products,%%$0.6%%Poultry%and%eggs,%%$0.3%%
• Direct%heat%stress%effects%on%the%animals%
• Changes%in%forage%quality%
• Heat%and%drought%stress,%changes%in%precipitaNon%regimes%
• Effects%on%chilling%regimes,%pests%and%diseases%
• CO2%ferNlizaNon%benefits%• Reduced%availability%of%water%for%
irrigaNon%
• Heat%and%drought%stress%• Changes%in%precipitaNon%
regimes%that%affect%farming%operaNons%
• CO2%ferNlizaNon%benefits%• Reduced%availability%of%water%
for%irrigaNon%
• CO2%ferNlizaNon%benefits%• Reduced%availability%of%water%
for%irrigaNon%
201! 202!
6.4.1 Annual Crops 203!
6.4.1.1 Dryland Cereal Cropping Systems 204!
The semiarid portions of central Washington and the Columbia Plateau in Washington, 205!
Oregon, and Idaho support cereal-based cropping systems without irrigation. The region can be 206!
subdivided into agroclimatic zones (Douglas et al. 1992) ranging from a warm, dry zone (located 207!
in the dryland cereal and hay production areas, fig. 6.2) where winter wheat-fallow production 208!
predominates, to cooler, wet zones (located in the non-irrigated mixed crops areas, fig. 6.2) 209!
where continuous cropping incorporates cool season legumes in rotation with spring and winter 210!
cereals. Depending upon emission scenarios and projected dates, these dryland regions are 211!
vulnerable to projected reductions in summer precipitation and warming, which potentially 212!
reduce yields or exacerbate production challenges on marginal lands, as is currently the case in 213!
the western portions of the dryland cereal areas of central Washington. Projected increases in 214!
Dalton et al. Fig 6.3
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Climate
Health effects of climate: pathways
Weather
Air pollution
Pollen
Microbial contamination
and transmission
Crop yield
Heat related illness and death
Effects of extreme weather
Effects of pollution
Allergic diseases
Infectious diseasesWater-, food-, and vector-
borne diseases
Food insecurityadapted from Haines and Patz (2004) adaptation Dalton et al. Fig 7.1
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•Oregon Health Authority study: 10°F higher temps -> 3x more heat related effects
•Wind storms: Columbus Day 46 fatalities, December 2007 18
•Wildfires (CA): more hospitalizations from respiratory problems
Observed effects
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•Connections to land and resources recognized in treaty: usual & accustomed
•Unique challenges with climate change: resources changing, but are viewed more significantly than by the dominant culture
•Climate adaptation efforts (e.g. Swinomish)
Tribal dimensions
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Conclusions
•We are moving rapidly to an unfamiliar environment
•Both risks and benefits of change - minimize risks and maximize benefits if change is slow, consequences are anticipated
•Sustained process of analysis, engagement, and action required
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not part of any Climate Assessment reports