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GLOBAL CLIMATE CHANGE IMPACTS IN THE UNITED STATES -- A STATE OF KNOWLEDGE REPORT FROM THE U.S. GLOBAL CHANGE RESEARCH PROGRAM

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26 The spatial average of annual-average surface air temperatures
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32 Uncertainties in the data are an order of magnitude smaller than
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59 The temperature data for the globe is the standard NOAA/NCDC
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62 Gillett, N.P., D.A. Stone, P.A. Stott, T. Nozawa, A.Y. Karpechko,
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63 Ramaswamy, V., J.W. Hurrell, G.A. Meehl, A. Phillips, B.D. Santer,
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64 Stott, P.A., 2003: Attribution of regional-scale temperature changes
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66 Santer, B.D., T.M.L. Wigley, P.J. Glecker, C. Bonfils, M.F. Wehner,
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71 CCSP, 2006: Temperature Trends in the Lower Atmosphere: Steps
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72 Smith, T.M., R.W. Reynolds, T.C. Peterson, and J. Lawrimore, 2008:
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73 Haimberger, L., C. Tavolato, and S. Sperka, 2008: Toward elimination
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74 Sherwood, S.C., C.L. Meyer, R.J. Allen, and H.A. Titchner, 2008:
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75 Titchner, H.A., P.W. Thorne, M.P. McCarthy, S.F.B. Tett, L.
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76 Delworth, T.L., P.U. Clark, M. Holland, W.E. Johns, T. Kuhlbrodt, J.
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77 Wentz, F.J., L. Ricciardulli, K. Hilburn, and C. Mears, 2007: How
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78 Stott, P.A., D.A. Stone, and M.R. Allen, 2004: Human contribution
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79 CCSP, 2008: Introduction. In: Climate Models: An Assessment of
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80 Randall, D.A., R.A. Wood, S. Bony, R. Coman, T. Fichefet, J. Fyfe,
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81 Nakićenović, N. and R. Swart (eds.), 2000: Special Report on Emissions
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82 Raupach, M.R., G. Marland, P. Ciais, C. Le Quéré, J.G. Canadell,
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of Sciences, 104(24), 10288-10293.

83 O’Neill, B.C. and M. Oppenheimer, 2004: Climate change impacts
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the National Academy of Sciences, 101(47), 16411-16416.

84 Schneider, S.H. and M.D. Mastrandrea, 2005: Probabilistic
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85 Lenton, T.M., H. Held, E. Kriegler, J.W. Hall, W. Lucht, S.
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86 Hansen, J., M. Sato, R. Ruedy, P. Kharecha, A. Lacis, R. Miller,
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87 Ramanathan, V. and Y. Feng, 2008: On avoiding dangerous anthropogenic
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88 Meinshausen, M., 2006: What does a 2°C target mean for greenhouse
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York, pp. 265-280.

89 Meinshausen, M., B. Hare, T.M.L. Wigley, D. van Vuuren, M.G.J.
den Elzen, and R. Swart, 2006: Multi-gas emission pathways to
meet climate targets. Climatic Change, 75(1), 151-194.

90 Meehl, G.A., T.F. Stocker, W.D. Collins, P. Friedlingstein, A.T.
Gaye, J.M. Gregory, A. Kitoh, R. Knutti, J.M. Murphy, A. Noda,
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91 Refer to the description of the emissions scenarios in the Global
Climate Change section on pages 22-25. “Lower emissions scenario”
refers to IPCC SRES B1, “higher emissions scenario” refers
to A2 and “even higher emissions scenario” refers to A1FI.

92 IPCC Emissions Scenarios (Even Higher, Higher Emission
Scenario, Lower Emission Scenario): Nakićenović, N. and R.
Swart (eds.), 2000: Appendix VII: Data tables. In: Special Report
on Emissions Scenarios. A special report of Working Group III
of the Intergovernmental Panel on Climate Change. Cambridge
University Press, Cambridge, UK, and New York. <http://www.
grida.no/publications/other/ipcc_sr/?src=/climate/ipcc/emission/>
Emission trajectories are spline fits as per Raupach, M.R., G.
Marland, P. Ciais, C. Le Quéré, J.G. Canadell, G. Klepper, and C.B.
Field, 2007: Global and regional drivers of accelerating CO2 emissions.
Proceedings of the National Academy of Sciences, 104(24),
10288-10293.
Stabilization scenario (450 ppm): CCSP 2.1a Scenario Information
070707 data file. From: Clarke, L., J. Edmonds, H. Jacoby,
H. Pitcher, J. Reilly, and R. Richels, 2007: Scenarios of Greenhouse
Gas Emissions and Atmospheric Concentrations. Sub-report
2.1A of Synthesis and Assessment Product 2.1. U.S. Department
of Energy, Office of Biological & Environmental Research,
Washington, DC. The emissions and concentrations shown were
from MINICAM 1 and 2. See CCSP 2.1A Executive summary for
more information. Spread sheet available at <http://www.climate
science.gov/Library/sap/sap2-1/finalreport/default.htm>
Observations of CO2 emissions (Fossil Fuel CO2 Emissions
graphic) are updates to: Marland, G., B. Andres, T. Boden, 2008:
Global CO2 Emissions from Fossil-Fuel Burning, Cement Manufacture,
and Gas Flaring: 1751-2005. Carbon Dioxide Information
Analysis Center, Oak Ridge National Laboratory, Oak Ridge, TN.
<http://cdiac.ornl.gov/ftp/ndp030/global.1751_2005.ems>
Observations of CO2 concentrations (Atmospheric CO2
Concentrations graphic): Tans, P., 2008: Trends in Atmospheric
Carbon Dioxide: Mauna Loa. NOAA Earth System Research
Laboratory (ESRL). [Web site] <http://www.esrl.noaa.gov/gmd/
ccgg/trends/> Data available at <ftp://ftp.cmdl.noaa.gov/ccg/co2/
trends/co2_annmean_mlo.txt>

93 CMIP3-A: This analysis uses 15 models simulations from
the WCRP CMIP3 that were available at resolutions finer
than 4 degrees (CCSM3.0, CSIRO, UKMO-HadCM3, IPSL,
ECHAM5/MPI, CGCM3.1(T47), GFDL2.0, UKMO-HadGEM1,
MIROC3.2(medres), MRI-CGCM2.3.2a, CNRM, GFDL2.1, INMCM3,
ECHO-G, PCM). See Wehner, M., 2005: Changes in daily
precipitation and surface air temperature extremes in the IPCC
AR4 models. US CLIVAR Variations, 3(3), 5-9.
Hatching indicates at least two out of three models agree on the
sign of the projected change in precipitation.
We acknowledge the modeling groups, the Program for Climate
Model Diagnosis and Intercomparison (PCMDI) and the WCRP’s
Working Group on Coupled Modelling (WGCM) for their roles in
making available the WCRP CMIP3 multi-model dataset, <http://
www-pcmdi.llnl.gov/projects/cmip/index.php>. Support of this
dataset is provided by the Office of Science, U.S. Department of
Energy. For an overview and documentation of the CMIP3 modelling
activity, see Meehl, G.A., C. Covey, T. Delworth, M. Latif, B.
McAvaney, J.F.B. Mitchell, R.J. Stouffer, and K.E. Taylor, 2007:
The WCRP CMIP3 multi-model dataset: a new era in climate
change research. Bulletin of the American Meteorological Society,
88(9), 1383-1394.

94 Hare, B. and M. Meinshausen, 2006: How much warming are we
committed to and how much can be avoided? Climatic Change,
75(1), 111-149.

95 den Elzen, M.G.J. and M. Meinshausen, 2006: Multi-gas emission
pathways for meeting the EU 2°C climate target. In: Avoiding
Dangerous Climate Change [Schellnhuber, J.S., W. Cramer,
N. Nakićenović, T.M.L. Wigley and G. Yohe (eds.)]. Cambridge
University Press, Cambridge, UK, and New York, pp. 299-310.

96 Seidel, D.J., Q. Fu, W.J. Randel, and T.J. Reichler, 2008: Widening
of the tropical belt in a changing climate. Nature Geoscience, 1(1),
21-24.

97 Cook, E.R., P.J. Bartlein, N. Diffenbaugh, R. Seager, B.N. Shuman,
R.S. Webb, J.W. Williams, and C. Woodhouse, 2008: Hydrological
variability and change. In: Abrupt Climate Change. Synthesis
and Assessment Product 3.4. U.S. Geological Survey, Reston, VA,
pp. 143-257.

98 Emanuel, K., 2005: Increasing destructiveness of tropical cyclones
over the past 30 years. Nature, 436(7051), 686-688.

99 Vecchi, G.A., K.L. Swanson, and B.J. Soden, 2008: Whither
hurricane activity? Science, 322(5902), 687-689.

100 Emanuel, K., R. Sundararajan, and J. Williams, 2008: Hurricanes
and global warming: Results from downscaling IPCC AR4
simulations. Bulletin of the American Meteorological Society,
89(3), 347-367.

101 Vecchi, G.A. and B.J. Soden, 2007: Effect of remote sea surface
temperature change on tropical cyclone potential intensity. Nature,
450(7172), 1077-1070.

102 Alley, R.B., P.U. Clark, P. Huybrechts, and I. Joughin, 2005: Icesheet
and sea-level changes ice-sheet and sea-level changes.
Science, 310(5747), 456-460.

103 Rahmstorf, S., 2007: A semi-empirical approach to projecting
future sea-level rise. Science, 315(5810), 368-370.

104 Mitrovica, J.X., N. Gomez, and P.U. Clark, 2009: The sea-level
fingerprint of West Antarctic collapse. Science, 323(5915), 753.

105 Clark, P.U., A.J. Weaver, E. Brook, E.R. Cook, T.L. Delworth,
and K. Steffen, 2008: Introduction: Abrupt changes in the Earth’s
climate system. In: Abrupt Climate Change. Synthesis and Assessment
Product 3.4. U.S. Geological Survey, Reston, VA, pp. 19-59.

106 Brook, E., D. Archer, E. Dlugokencky, S. Frolking, and D.
Lawrence, 2008: Potential for abrupt changes in atmospheric
methane. In: Abrupt Climate Change. Synthesis and Assessment
Product 3.4. U.S. Geological Survey, Reston, VA, pp. 360-452.

107 Temperatures for the contiguous U.S. are based on data from the
U.S. Historical Climatology Network Version 2 (Menne et al.
2008). Temperatures for Alaska, Hawaii, and Puerto Rico are
based on data from the Cooperative Observers Network adjusted
to remove non-climatic influences such as changes in instruments
and observer practices and changes in the station environment
(Menne and Williams, 2008).
U.S. time series on page 27 is calculated with data for the
contiguous US, Alaska, and Hawaii. US map on page 28 lower
left includes observed temperature change in Puerto Rico. Winter
temperature trend map in the agriculture section, page 76, is for the
contiguous US only.
References for this endnote:
Menne, M.J., C.N. Williams, and R.S. Vose, 2009: The United
States Historical Climatology Network Monthly Temperature Data
- Version 2. Bulletin of the American Meteorological Society, Early
online release, 25 February 2009, doi:10.1175/2008BAMS2613.1
Menne, M.J. and C.N. Williams Jr., 2008: Homogenization of
temperature series via pairwise comparisons. Journal of Climate,
22(7), 1700-1717.

108 Christensen, J.H., B. Hewitson, A. Busuioc, A. Chen, X. Gao, I.
Held, R. Jones, R.K. Kolli, W.-T. Kwon, R. Laprise, V. Magaña
Rueda, L. Mearns, C.G. Menéndez, J. Räisänen, A. Rinke, A.
Sarr, and P. Whetton, 2007: Regional climate projections. In:
Climate Change 2007: The Physical Basis. Contribution of Working
Group I to the Fourth Assessment Report of the Intergovernmental
Panel on Climate Change [Solomon, S., D. Qin, M. Manning, Z.
Chen, M. Marquis, K.B. Averyt, M. Tignor, and H.L. Miller (eds.)].
Cambridge University Press, Cambridge, UK, and New York,
pp. 847-940.

109 CMIP3-C: Analysis for the contiguous U.S. was based on
methods described in: Hayhoe, K., D. Cayan, C.B. Field, P.C.
Frumhoff, E.P. Maurer, N.L. Miller, S.C. Moser, S.H. Schneider,
K.N. Cahill, E.E. Cleland, L. Dale, R. Drapek, R.M. Hanemann,
L.S. Kalkstein, J. Lenihan, C.K. Lunch, R.P. Neilson, S.C.
Sheridan, and J.H. Verville, 2004: Emission pathways, climate
change, and impacts on California. Proceedings of the National
Academy of Sciences, 101(34), 12422-12427; and Hayhoe, K., C.
Wake, B. Anderson, X.-Z. Liang, E. Maurer, J. Zhu, J. Bradbury,
A. DeGaetano, A.M. Stoner, and D. Wuebbles, 2008: Regional climate
change projections for the Northeast USA. Mitigation and
Adaptation Strategies for Global Change, 13(5-6), 425-436. This
analysis uses 16 models simulations from the WCRP CMIP3.
Where models had multiple runs, only the first run available from
each model was used. See <http://gdo-dcp.ucllnl.org/downscaled_
cmip3_projections/dcpInterface.html> for more information.
The Alaskan projections are based on 14 models that best captured
the present climate of Alaska; see Walsh, J.E., W.L. Chaman,
V. Romanovsky, J.H. Christensen, and M. Stendel, 2008: Global
climate model performance over Alaska and Greenland. Journal
of Climate, 21(23), 6156-6174.
Caribbean and Pacific islands analyses use 15 models simulations
from the WCRP CMIP3 that were available at resolutions
finer than 4 degrees (CCSM3.0, CSIRO, UKMO-HadCM3, IPSL,
ECHAM5/MPI, CGCM3.1(T47), GFDL2.0, UKMO-HadGEM1,
MIROC3.2(medres), MRI-CGCM2.3.2a, CNRM, GFDL2.1, INMCM3,
ECHO-G, PCM). See Wehner, M., 2005: Changes in daily
precipitation and surface air temperature extremes in the IPCC
AR4 models. US CLIVAR Variations, 3(3), 5-9.
We acknowledge the modeling groups, the Program for Climate
Model Diagnosis and Intercomparison (PCMDI) and the WCRP’s
Working Group on Coupled Modelling (WGCM) for their roles in
making available the WCRP CMIP3 multi-model dataset, <http://
www-pcmdi.llnl.gov/projects/cmip/index.php>. Support of this
dataset is provided by the Office of Science, U.S. Department of
Energy. For an overview and documentation of the CMIP3 modelling
activity, see Meehl, G.A., C. Covey, T. Delworth, M. Latif, B.
McAvaney, J.F.B. Mitchell, R.J. Stouffer, and K.E. Taylor, 2007:
The WCRP CMIP3 multi-model dataset: a new era in climate
change research. Bulletin of the American Meteorological Society,
88(9), 1383-1394.

110 Detailed local-scale projections about temperature and precipitation
changes displayed in this report were generated using welldocumented
“statistical downscaling” techniques [Wood et al.,
2002] for the contiguous U.S. and Alaska. These techniques use
statistical relationships between surface observations and climate
simulations of the past to develop modifications for the global model
results. These modifications are then applied to the climate projections
for the future scenarios. The approach is also used to drive
daily simulations by a well-established hydrological modeling
framework for the contiguous U.S. [Liang et al., 1994]. This method,
which modifies global climate model simulations to better account
for landscape variations and other features affecting climate
at the regional to local scale, has been previously applied to generate
high-resolution regional climate projections for the Northeast,
Midwest, Northwest, and Southwest [Wood et al., 2004; Hayhoe
et al., 2004; Hayhoe et al., 2008; Cayan et al., 2008; Cherkauer et
al., 2009]. Comparison of these methods with dynamically downscaled
projections generated using regional climate model simulations
provide strong justification for the use of such techniques
[Wood et al., 2004; Hayhoe et al., 2008].
References for this endnote:
Cayan, D., E. Maurer, M. Dettinger, M. Tyree, and K. Hayhoe,
2008: Climate change scenarios for the California region. Climatic
Change, 87(Supplement 1), S21-S42.
Cherkauer, K. and T. Sinha, 2009: Hydrologic impacts of
projected future climate change in the Lake Michigan region. Journal
of Great Lakes Research, in press.
Hayhoe, K., D. Cayan, C.B. Field, P.C. Frumhoff, E.P. Maurer,
N.L. Miller, S.C. Moser, S.H. Schneider, K.N. Cahill, E.E.
Cleland, L. Dale, R. Drapek, R.M. Hanemann, L.S. Kalkstein, J.
Lenihan, C.K. Lunch, R.P. Neilson, S.C. Sheridan, and J.H. Verville,
2004: Emission pathways, climate change, and impacts on California. Proceedings of the National Academy of Sciences, 101(34),
12422-12427.
Hayhoe, K., C. Wake, B. Anderson, X.-Z. Liang, E. Maurer, J.
Zhu, J. Bradbury, A. DeGaetano, A.M. Stoner, and D. Wuebbles,
2008: Regional climate change projections for the Northeast USA.
Mitigation and Adaptation Strategies for Global Change, 13(5-6),
425-436.
Liang, X., D. Lettenmaier, E. Wood, and S. Burges, 1994: A
simple hydrologically-based model of land surface water and
energy fluxes for general circulation models. Journal of Geophysical
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Maurer, E.P., A.W. Wood, J.C. Adam, D.P. Lettenmaier, and B.
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surface fluxes and states for the conterminous United States. Journal
of Climate, 15(22), 3237-3251.
Wood, A.W., L.R. Leung, V. Sridhar, and D.P. Lettenmaier,
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Wood, A.W., E.P. Maurer, A. Kumar, and D.P. Lettenmaier,
2002: Long range experimental hydrologic forecasting for the
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doi:10.1029/2001JD000659.

111 NOAA’s National Climatic Data Center, 2008: The USHCN Version
2 Serial Monthly Dataset. [Web site] <http://www.ncdc.noaa.gov/
oa/climate/research/ushcn/>

112 Kunkel, K.E., P.D. Bromirski, H.E. Brooks, T. Cavazos, A.V.
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Regions of Focus: North America, Hawaii, Caribbean, and U.S.
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A.M. Waple, and W.L. Murray (eds.)]. Synthesis and Assessment
Product 3.3. U.S. Climate Change Science Program, Washington,
DC, pp. 35-80.

113 Groisman, P.Ya., R.W. Knight, T.R. Karl, D.R. Easterling, B. Sun,
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115 Seager, R., M. Ting, I. Held, Y. Kushnir, J. Lu, G. Vecchi, H.-P.
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364 Iverson, L., A. Prasad, and S. Matthews, 2008: Potential changes
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372 International Snowmobile Manufacturers Association, 2006:
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377 Fogarty, M., L. Incze, K. Hayhoe, D. Mountain, and J. Manning,
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385 Mann, M.E. and K.A. Emanuel, 2006: Atlantic hurricane trends
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388 Komar, P.D. and J.C. Allan, 2007: Higher waves along U.S. East
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389 Change calculated from daily minimum temperatures from NCDC’s
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390 Nicholls, R.J., P.P. Wong, V.R. Burkett, J.O. Codignotto, J.E. Hay,
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395 USGS, photos and images:
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411 Several different city of Chicago analyses have substantiated the
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