var bengtsson_etal04 = "Bengtsson, L., V. A. Semenov, and O. M. Johannessen, 2004: The early-twentieth-century warming in the Arctic&mdash;A possible mechanism. <i>J. Climate, </i><b>17, </b>4045&ndash;4057.";
var broccoli_etal03 = "Broccoli, A. J., K. W. Dixon, T. L. Delworth, and T. R. Knutson, 2003: Twentieth-century temperature and precipitation trends in ensemble climate simulations including natural and anthropogenic forcing. <i>J. Geophys. Res., </i><b>108, </b>4798, doi:10.1029/2003JD003812.";
var delworth_knutson00 = "Delworth, T. L., and T. R. Knutson, 2000: Simulation of early 20th century global warming. <i>Science, </i><b>287, </b>2246&ndash;2250.";
var hansen_lebedeff87 = "Hansen, J., and S. Lebedeff, 1987: Global trends of measured surface air temperature. <i>J. Geophys. Res., </i><b>92, </b>13 345&ndash;13 372.";
var hansen_etal99 = "Hansen, J., R. Ruedy, J. Glascoe, and M. Sato, 1999: GISS analysis of surface temperature change. <i>J. Geophys. Res., </i><b>104, </b>30 997&ndash;31 022.";
var houghton_etal01 = "Houghton, J. T., Y. Ding, D. J. Griggs, M. Noguer, P. J. van der Linden, X. Dai, K. Maskell, and C. A. Johnson, Eds., 2001: <i>Climate Change: The Scientific Basis</i>. Cambridge University Press, 881 pp.";
var johannessen_etal04 = "Johannessen, O. M., and Coauthors, 2004: Arctic climate change: Observed and modelled temperature and sea-ice variability. <i>Tellus, </i><b>56A, </b>328&ndash;341.";
var jones_etal82 = "Jones, P. D., T. M. L. Wigley, and P.M. Kelly, 1982: Variations in surface air temperatures. Part I: Northern Hemisphere, 1881&ndash;1980. <i>Mon. Wea. Rev., </i><b>110, </b>59&ndash;70.";
var jones_etal99 = "Jones, P. D., M. New, D. E. Parker, S. Martin, and I. G. Rigor, 1999: Surface air temperature and its changes over the past 150 years. <i>Rev. Geophys., </i><b>37, </b>173&ndash;199.";
var karoly_etal03 = "Karoly, D., K. Braganza, P. A. Stott, J. M. Arblaster, G. A. Meehl, A. J. Broccoli, and K. W. Dixon, 2003: Detection of a human influence on North American climate. <i>Science, </i><b>302, </b>1200&ndash;1203.";
var lambert_boer01 = "Lambert, S. J., and G. J. Boer, 2001: CMIP1 evaluation and inter-comparison of coupled climate models. <i>Climate Dyn., </i><b>17,</b> 83&ndash;106.";
var nakicenovic_swart00 = "Nakicenovic, N., and R. Swart, Eds., 2000: <i>Special Report on Emissions Scenarios. </i>Cambridge University Press, 612 pp.";
var new_etal99 = "New, M., M. Hulme, and P. Jones, 1999: Representing twentieth-century space&ndash;time climate variability. Part I: Development of a 1961&ndash;90 mean monthly terrestrial climatology. <i>J. Climate, </i><b>12, </b>829&ndash;856.";
var new_etal00 = "New, M., M. Hulme, and P. Jones, 2000: Representing twentieth-century space&ndash;time climate variability. Part II: Development of 1901&ndash; 96 monthly grids of terrestrial surface temperature. <i>J. Climate, </i><b>13, </b>2217&ndash;2238.";
var overland_wang05 = "Overland, J. E., and M. Wang, 2005: The Arctic climate paradox: The recent decreases of the Arctic Oscillation. <i>Geophys. Res. </i><i>Lett., </i><b>32, </b>L06701, doi:10.1029/2004GL021752.";
var overland_etal04 = "Overland, J. E., M. C. Spillane, D. B. Percival, M. Wang, and H. O. Mofjeld, 2004: Seasonal and regional variation of Pan-Arctic air temperature over the instrumental record. <i>J. Climate, </i><b>17, </b>3263&ndash;3282.";
var peterson_vose97 = "Peterson, T. C., and R. S. Vose, 1997: An overview of the global historical climatology network temperature database. <i>Bull. </i><i>Amer. Meteor. Soc., </i><b>78, </b>2837&ndash;2849.";
var polyakov_etal02 = "Polyakov, I. V., and Coauthors, 2002: Observationally based assessment of polar amplification of global warming. <i>Geophys. </i><i>Res. Lett., </i><b>29, </b>1878, doi:10.1029/2001GL011111.";
var quayle_etal99 = "Quayle, R. G., T. C. Peterson, A. N. Basist, and C. S. Godfrey, 1999: An operational near-real-time global temperature index. <i>Geophys. Res. Lett., </i><b>26, </b>333&ndash;335.";
var santer_etal00 = "Santer, B. D., T. M. L. Wigley, J. S. Boyle, D. J. Gaffen, J. J. Hnilo, D. Nychka, D. E. Parker, and K. E. Taylor, 2000: Statistical significance of trends and trend differences in layer-average atmospheric temperature time series. <i>J. Geophys. Res., </i><b>105, </b>7337&ndash;7356.";
var stott_etal00 = "Stott, P. A., S. F. B. Tett, G. S. Jones, M. R. Allen, J. F. B. Mitchell, and G. J. Jenkins, 2000: External control of 20th century temperature by natural and anthropogenic forcings. <i>Science, </i><b>290, </b>2133&ndash;2137.";
var symon_etal05 = "Symon, C., L. Arris, and B. Hill, Eds., 2005: <i>Arctic Climate Impact Assessment. </i>Cambridge University Press, 1042 pp.";
var wang_overland04 = "Wang, M., and J. E. Overland, 2004: Detecting Arctic climate change using K&ouml;ppen climate classification. <i>Climatic Change, </i><b>67, </b>43&ndash;62.";
var watson_etal01 = "Watson, R. T., and Coeditors, 2001: <i>Climate Change 2001: Synthesis Report. </i>Cambridge University Press, 398 pp.";
var zhang_walsh06 = "Zhang, X., and J. E. Walsh, 2006: Toward a seasonally ice-covered Arctic Ocean: Scenarios from the IPCC AR4 model simulations. <i>J. Climate, </i><b>19, </b>1730&ndash;1747.";