Glaciation last, changes

Fig. 18-10 (a) Accumulation rate history for Greenland (Alley et ai, 1993 Guffey and Clow, 1997), with insets focusing on the Younger Dryas cold interval and the very rapid termination of the last glaciation, with substantial change that occurred in only 3 years noted (after Alley et ai, 1993). (b) Accumulation-rate history, normalized to the modem rate, for Antarctica (Raisbeck et ah, 1987), derived from °Be analysis. 

Changes in the C0 system at the end of last glaciation Compression of the 14C time scale around l0,000 BP... 

One of the more important applications of the carbonate paleo-temperature scale was to aid our understanding of the climate changes Earth has experienced during the last 3 million years, a period of intermittent glaciation. 8lsO data from a Caribbean sedimentary core corresponding to the most recent 700,000 years are shown in Fig. 9.2. The repeated variations in 8lsO of amplitude 1.6%o and... 

Analysis of the data on temperature measured in boreholes made an important contribution ito ideas about SAT changes in the past. For instance, Bodri and Cermak (1999) noted that if the amplitude of long-term SAT variations during transitions from glaciations to interglacial periods had reached 10K-15K in the Holocene (the last 10,000-14,000 years), changes of several °K would have taken place on time scales from decades to centuries. In this connection, analysis has been made of the data on the vertical profiles of temperature measured at different depths in boreholes, and maps have been drawn of SAT changes over the Czech Republic, which took place between 1100 bc to 1300 bc (small climatic optimum), between 1400 and 1500, and between 1600 and 1700 (main phases of the Little Ice Age). 

Marchitto, T. M., Curry, W. B., and Oppo, D. W. (1998). Millennial-scale changes in North Atlantic circulation since the last glaciation. Nature 393(6685), 557—561. 

Clark P.U., Marshall S.J., Clarke G.K.C., Hosteder S.W., Licciardi J.M., Teller J.T. (2001) Freshwater forcing of abrupt climate change during the last glaciation. Science 293, 283-7. 

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