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FIGURE 5.47 Decadal averages of net accumulation on the Quelccaya Ice Cap (Peru) and the Guliya Ice Cap (western Tibet) over the past 1000 yr. Broadly similar trends are seen in both areas, though the reasons are not clear.These two regions are linked by teleconnections on the timescale of ENSO events (3-7 yr) and there may be similar teleconnections at lower frequencies linking monsoon precipitation at Guliya with snowfall amounts in the mountains of Peru (Thompson et al., 1995a).

Decadal Averages

FIGURE 5.47 Decadal averages of net accumulation on the Quelccaya Ice Cap (Peru) and the Guliya Ice Cap (western Tibet) over the past 1000 yr. Broadly similar trends are seen in both areas, though the reasons are not clear.These two regions are linked by teleconnections on the timescale of ENSO events (3-7 yr) and there may be similar teleconnections at lower frequencies linking monsoon precipitation at Guliya with snowfall amounts in the mountains of Peru (Thompson et al., 1995a).

at Dunde, 8lsO values were higher in the last 50 years than in any other 50-yr period over the last 12,000 yr (though the record decreases in resolution with time). These records, plus evidence from other short ice cores from high altitudes (Hastenrath and Kruss, 1992) point to a dramatic climatic change in recent decades, prompting concern over the possible loss of these unique archives of paleoenvi-ronmental history (Thompson et al., 1993). The cause of the recent warming remains controversial.

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