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The Climate of the Last Millennium The Climate of the Last Millennium R.S. Bradley Climate System Research Center, Department of Geosciences, University of Massachusetts, Amherst, MA, 01003, United States of America K.R. Briffa Climatic Research Unit, University of East Anglia, Norwich, NR4 7TJ, United Kingdom J.E. Cole Department of Geosciences, University Arizona, Tucson, AZ 85721, United States of America M.K. Hughes Lab. of Tree-Ring Research, University of Arizona, 105 W. Stadium, Bldg. 58, Tucson, AZ 85721, United States of America T.J. Osborn Climatic Research Unit, University of East Anglia, Norwich, NR4 7TJ, United Kingdom 6.1 Introduction records with annual to decadal resolution (or even We are living in unusual times. Twentieth century higher temporal resolution in the case of climate was dominated by near universal warming documentary records, which may include daily with almost all parts of the globe experiencing tem- observations, e.g. Brázdil et al. 1999; Pfister et al. peratures at the end of the century that were signifi- 1999a,b; van Engelen et al. 2001). Other cantly higher than when it began (Figure 6.1) information may be obtained from sources that are (Parker et al. 1994; Jones et al. 1999). However the not continuous in time, and that have less rigorous instrumental data provide only a limited temporal chronological control. Such sources include perspective on present climate. How unusual was geomorphological evidence (e.g. from former lake the last century when placed in the longer-term shorelines and glacier moraines) and macrofossils context of climate in the centuries and millennia that indicate the range of plant or animal species in leading up to the 20th century? Such a perspective the recent past. In addition, ground temperature encompasses the period before large-scale contami- measurements in boreholes reflect the integrated nation of the global atmosphere by human activities history of surface temperatures, with temporal and global-scale changes in land-surface conditions. resolution decreasing with depth. These provide By studying the records of climate variability and estimates of overall ground surface temperature forcing mechanisms in the recent past, it is possible changes from one century to the next (Pollack et al. to establish how the climate system varied under 1998; Huang et al. 2000). “natural” conditions, before anthropogenic forcing Proxies of past climate are natural archives that became significant. Natural forcing mechanisms have, in some way, incorporated a strong climatic will continue to operate in the 21st century, and will signal into their structure (Bradley 1999). For some play a role in future climate variations, so regardless biological proxies, such as tree ring density or coral of how anthropogenic effects develop it is essential band width, the main factor might be temperature – to understand the underlying background record of or more specifically, the temperature of a particular forcing and climate system response. season (or even just part of a season). Ring density Sources of information on the climate of the last and width can also be influenced by antecedent millennium include: historical documentary records, climatic conditions, and by other non-climatic fac- tree rings (width, density); ice cores (isotopes, melt tors. Similar issues are important in other proxies, layers, net accumulation, glaciochemistry); corals such as the timing of snowfall events that make up (isotopes and other geochemistry, growth rate); an ice core, or the rate and timing of sediment varved lake and marine sediments (varve thickness, transport to a lake. Though we recognize that the sedimentology, geochemistry, biological content) details of such relationships are important, proxies and banded speleothems (isotopes). These are all are rarely interpreted directly in terms of such very paleoclimatic proxies that can provide continuous 106 Bradley et al. DJF MAM 90N 90N 60N 60N 30N 30N EQ EQ 30S 30S 60S 60S 90S 90S 120E 180 120W 60W 0 60E 120E 120E 180 120W 60W 0 60E 120E JJA SON 90N 90N 60N 60N 30N 30N EQ EQ 30S 30S 60S 60S 90S 90S 120E 180 120W 60W 0 60E 120E 120E 180 120W 60W 0 60E 120E Annual 90N 60N 30N EQ 30S 60S 90S 120E 180 120W 60W 0 60E 120E Temperature trends (°C per century) over 1901-2000 -3 -2 -1 -0.5 0 0.5 1 2 3 Fig. 6.1. Seasonal and annual trends in surface air temperature, 1901-2000, based on instrumental measurements. Climate of the Last Millenium 107 specific climatic controls, but rather in terms of than in the late Holocene, as revealed by the evi- temperature or precipitation over a particular sea- dence of extensive early Holocene lake sediments, son. In many cases the main climatic signal in a and fossils of herbivores and aquatic reptiles in proxy record is not temperature alone. For example, areas that are today utterly arid (Petit-Maire and evidence of a formerly high lake level may indicate Riser 1983). In fact, evidence for much drier condi- higher rainfall amounts and/or a decrease in evapo- tions in the late Holocene (after ~4000 calendar ration related to cooler temperatures. Such issues years B.P.) is also found across central Asia and are grist to the paleoclimatologists’ mill and are the into Tibet (Gasse and van Campo 1994). Over much subject of numerous studies. Suffice it to say that of this region, conditions today are the driest they proxies that optimize a reconstruction of either have been throughout the Holocene. By contrast, temperature or precipitation are generally selected, lakes of inland drainage on the Altiplano of Peru and it is these studies that provide the basis for our and Bolivia have expanded and increased in depth review. from the mid-Holocene to the present. Lake Titi- Changes in temperature have large-scale spatial caca, for example, is currently close to its highest coherence, making it easier to identify major varia- level in the Holocene. Similarly, in northern Chile, tions with relatively few records. Spatially coherent lacustrine and archeological evidence points to arid precipitation changes are more local or regional in conditions from ~8000-3700 years B.P., followed extent, but they often reflect circulation changes by wetter conditions in the late Holocene (Grosjean that may have large-scale significance (as, for ex- et al. 1995). This is comparable to the situation in ample, in ENSO-related spring rainfall increases the western United States, especially Nevada and that commonly occur in the southwestern U.S. dur- eastern California (Thompson 1992; Benson et al. ing strong El Niño events; Stahle et al. 1998). In 1996; Quade et al. 1998). Furthermore, low latitude this chapter, we focus mainly on temperature varia- hydrological changes in the Holocene were often tions, but precipitation and hydrological variability abrupt (Gasse 2000; De Menocal et al. 2000) (e.g. are examined where there is good evidence for at ~4200 calendar years B.P. in North Africa and important changes at the regional scale. In particu- the Middle East, when many freshwater lakes were lar, we ask two questions regarding each attribute: reduced to swamps and arid lowlands within less • does the 20th century record indicate unique or than a century). As one might expect, such changes unprecedented conditions? had significant impacts on ecosystems and the peo- • do 20th century instrumental data provide a ple living in those areas, in some cases resulting in reasonable estimate of the range of natural complete societal collapse (Weiss et al. 1993; Dal- variability that could occur in the near future? fes et al. 1997; Weiss and Bradley 2001; De Meno- First we briefly summarise conditions during the cal 2001). Holocene epoch (the last 10,000 radiocarbon, or A coherent picture is also emerging of a distinctly ~11,700 calendar years), as a background to climate different pattern of El Niño/Southern Oscillation variability over the last millennium. Then we ex- (ENSO) variability before ~5,000 years B.P. amine the overall pattern of temperature change (Clement et al. 2000; Cole 2001). Most data and during the last 1000 years at the largest (hemi- model results are consistent with a more La Niña- spheric) scale, followed by a consideration of cli- like background state and reduced inter-annual mate variability in several large regions. Finally we variability during this period (see Chapter 3, Sec- look at the forcing factors that may have played a tion 3.31 for a complete discussion). For example, role in the variations identified. paleoclimatic observations indicate reduced inci- dence of heavy rains in Ecuador, absence of strong 6.2 Holocene climate variability annual rainfall extremes in northern Australia, warmer SST along the northern Great Barrier Reef, The Holocene epoch follows the last major pulse of and attenuated inter-annual variance in the ENSO- glaciation (the Younger Dryas interval) at the end sensitive warm pool north of New Guinea of the last glacial period, and encompasses a period (McGlone et al. 1992; Shulmeister and Lees 1995; of time before there was any substantial anthropo- Gagan et al. 1998; Tudhope et al. 2001). General genic forcing of climate. The Holocene has often circulation models forced with early Holocene or- been characterized as a period of relatively stable bital conditions simulate a cooler eastern/central climate, yet there is much evidence to the contrary. tropical Pacific, due to intensified trades associated In particular, the tropics and sub-tropics witnessed with a stronger Asian monsoon (Otto-Bliesner dramatic changes in hydrological conditions during 1999; Bush 1999; Liu et al. 2000). The latter two this period. Early to mid-Holocene conditions in the references show warming in the westernmost tropi- northern deserts of Africa were significantly wetter cal Pacific, much as La Niña brings today. Al- 108 Bradley et al. though these studies disagree on changes in the of numerous bowhead whales and other marine amplitude of inter-annual variability, a simpler mammals (that require relatively ice-free condi- model suggests that precessional forcing should tions) on raised beaches dating from that period result in weakened interannual ENSO strength.
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