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Ally Coined Later by a Colleague in Princeton. It Didn't Take Long for the Hockey Stick to Become a Central Icon in the Clima

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Ally Coined Later by a Colleague in Princeton. It Didn't Take Long for the Hockey Stick to Become a Central Icon in the Clima PROLOGUE: WHAT IS THE HOCKEY STICK?xix much of the observed warming had actually taken place since then. An anonymous reviewer suggested that we bring the curve up to date by including the observational temperature data, that is, modern ther- mometer measurements available through to the present. Th at led to a sharpened blade. Th e warmth at the end of the record rose well above that of any period of the past millennium, even taking into account the increasing margin of error as one goes back in time. Th us was born the hockey stick—though the term itself was actu- ally coined later by a colleague in Princeton. 5 It didn’t take long for the hockey stick to become a central icon in the climate change debate. It Northern Hemisphere 0.5 0.0 –0.5 from the 1961–1990 average from Departures (°C) in temperature –1.0 Data from thermometers (black) and from tree rings, corals, ice cores and historical records (dark gray). 1000 1200 1400 1600 1800 2000 Year Figure P.1: The Hockey Stick The thin dark grey curve denotes the estimated Northern Hemisphere tempera- ture for each year (relative to a baseline [0.0] marking the late twentieth-century average) as estimated from proxy data available through 1980. The gray-shaded region indicates the uncertainty in the annual temperature estimates (there is an estimated 95 percent certainty that the temperatures for any given year lie within the shaded region). The thick, smoother curve highlights the long-term varia- tions. The modern instrumental temperature-gauge record through the end of the twentieth century (thin black curve) is shown for comparison. [Adapted from IPCC Third Assessment Report, 2001; a similar version of this graphic appeared in our original 1999 publication.] 12THE HOCKEY STICK AND THE CLIMATE WARS Climate Change in Five Easy Steps By the mid-1990s, scientists were able to connect the dots when it came to establishing a human impact on our climate. (1) We knew for one thing that human activity—primarily the burning of fossil fuels—had increased carbon dioxide (CO 2 ) concentra- tions in the atmosphere. Th e legendary atmospheric scientist Charles Keeling fi rst began to make direct measurements of atmospheric CO 2 in 1958 at a pristine location far from any pollution sources—nearly three miles above sea level at the top of Mauna Loa in Hawaii. Th anks to Keeling’s work, we had an instrumental record of CO2 —the so-called Figure 2.1: The Keeling Curve Monthly measurements of atmospheric CO2 concentrations from Mauna Loa, Hawaii, dating back to 1958. The original measurements were made by Charles Keeling. The record is maintained and updated by scientists with the Scripps In- stitution of Oceanography. [From Scripps Institute of Oceanography/NOAA Earth System Research Laboratory.] 14THE HOCKEY STICK AND THE CLIMATE WARS The Greenhouse Effect Some of the infra- red radiation passes through the atmosphere, and Sun some is absorbed Some solar radiation and re-emitted in is reflected by the Earth all directions by and the atmosphere. greenhouse gas molecules. The effect of this is to warm the Earth’s surface and the lower atmosphere. Atmo sphere Solar radiation passes through the clear atmosphere. Most radiation is Infrared radiation is absorbed by the Earth’s emitted from the Earth’s surface and warms it. surface. Earth Figure 2.2: The Atmospheric Greenhouse Eff ect Earth is warmed by the incoming radiation from the Sun, and its temperature can stabilize only by producing its own invisible outgoing (infrared) radiation. The greenhouse eff ect involves the absorption of some of that outgoing radia- tion by greenhouse gases in our atmosphere. The greenhouse eff ect warms the surface by sending some of this radiation back toward Earth rather than allowing it to escape to space. (3) Indeed, as mentioned earlier, thermometer measurements told us that by the mid-1990s Earth had already warmed a little more than a degree Fahrenheit (roughly 0.6o C) since the dawn of industrialization. Th e globe was in fact warming. Th is observation alone may not seem that decisive; after all, the warming might have been at least partly natural in origin. However, the observation did not exist in isolation. Th ere was now evidence as to the probable cause. 16THE HOCKEY STICK AND THE CLIMATE WARS Hansen’s three projected global warming scenarios Model simulation of past Model projections of future 1.5 (in 1988) Hansen’s 1988 simulations Scenario A Scenario B Scenario C 1.0 Observed data Weather station data 0.5 0.0 Annual mean global temperature change (°C) change mean global temperature Annual 19601970 1980 1990 2000 2010 2020 Year Source: Pearson Education, Inc., 2009 Figure 2.3: Testing Climate Models A comparison of three diff erent simulations of global warming through 2020 made by James Hansen in 1988. The curve made up of weather station observa- tions (available through 2005 in this analysis) closely matches the curve of the middle scenario (B)—the one that is based on the trajectory of an emissions sce- nario that most closely matches actual greenhouse gas emissions over the pre- ceding twenty years. The upper and lower curves correspond to scenarios A and C, which assume higher and lower emissions respectively. leading to localized patterns of cooling that off set global warming in some regions. Th e pattern of warming predicted by the models from the combination of these two human eff ects on the climate provide a unique “fi ngerprint” of what the human infl uence on climate should look like if the models were correct—and the fi ngerprint matched. Th e surface and lower atmosphere showed an irregular pattern of warming, while the atmosphere aloft was cooling, just as the models indicated it should. 3 Th e fi ngerprint predicted for natural factors alone—for example, from fl uctuations in solar output—on the other hand, failed to match the ob- servations. It was the work of Ben Santer and other climate scientists during the mid-1990s in establishing this fi ngerprint of human infl u- 24THE HOCKEY STICK AND THE CLIMATE WARS Figure 2.4: The Stages of Denial A cartoon that uses a thermometer to gauge one conception of the various stages of climate change denial. [TOLES ©2009 The Washington Post. Re- printed with permission of UNIVERSAL UCLICK. All rights reserved.] trending Keeling curve of CO2 levels plain for anyone to see, few were calling into question the rise in atmospheric CO2 by the time I had en- tered climate science in the early 1990s. But you could still fi nd claims that there was no evidence of warming. John Christy and Roy Spencer of the University of Alabama at Huntsville, for example, argued in a series of papers in the early 1990s that the satellite temperature measurements they had analyzed demonstrated an absence of warming in the atmo- sphere. 14 Problems with their estimation procedures were established by the late 1990s, however. 15 When their original fi ndings were found to have been almost entirely in error, they did acknowledge that Earth is warming. Spencer still contends, nonetheless, that humans are not to 36THE HOCKEY STICK AND THE CLIMATE WARS 1.0 Instrumental Central England Temperature Record Lamb reconstruction version one Lamb reconstruction version two 0.0 from the 1961–1900 average from Departures (°C) in temperature –1.0 1000 AD 1500 AD 1900 AD Year Figure 3.1: The Medieval Warm Period The graph shows two slightly diff erent versions of Lamb’s early qualitative re- construction of temperatures in central England over the past thousand years, compared with more modern instrumental temperatures beginning in the seven- teenth century. One vertical tick mark spacing corresponds roughly to a 1oC temperature variation. [Adapted from Jones et al., “High-Resolution Paleoclima- tology of the Last Millennium: A Review of Current Status and Future Prospects,” Holocene (2009): 34.] researchers were discovering were tied to shifts in atmospheric circula- tion and rainfall patterns, rather than to changes in temperature. For these reasons, paleoclimate researchers have increasingly favored the use of the term “medieval climate anomaly” (MCA) over the potentially misleading “medieval warm period” moniker. 13 Toward the Abyss As I was completing my Ph.D. in 1996, I remained interested in using proxy climate records to study the longer-term patterns of natural cli- 46THE HOCKEY STICK AND THE CLIMATE WARS West East Temperature data 1 (a) (b) 0.5 0 –0.5 –1 PC 1 (60%) 1 (c) (d) 0.5 0 –0.5 –1 PC 2 (40%) 1 Temperature departure (°C) Temperature (e) (f) 0.5 0 –0.5 –1 0 50 100 0 50 100 Year Figure 4.1: PCA Example: Spatial and Temporal Variations in Temperature Data This example shows how PCA can be used to characterize effi ciently a global temperature dataset (top) in terms of a small number of patterns in space and time. In this case, just two patterns (middle and bottom) characterize the data. The horizontal axis is time in years, and the vertical axis depicts the relative de- parture of temperature in degrees from the average over the baseline, 0 (in this case, the average over the full hundred-year period). represent effi ciently the information from the modern instrumental record. Spanning a century, the instrumental surface temperature dataset contained more than a thousand months of data at more than a thousand locations around the globe.12 But only a handful of patterns could potentially be captured by our noisy proxy dataset. Th e tempera- ture data thus also needed to be represented in terms of a modest num- ber of its most prominent underlying patterns.
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