984 resultados para Year end
Resumo:
China has just announced that its exports declined on an annual basis last year, for the first time since the country began opening up its economy to the world at the end of the 1970s. And that is not all; in value terms, global trade declined in 2015. The obvious question is why?
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Two deep ice cores from central Greenland, drilled in the 1990s, have played a key role in climate reconstructions of the Northern Hemisphere, but the oldest sections of the cores were disturbed in chronology owing to ice folding near the bedrock. Here we present an undisturbed climate record from a North Greenland ice core, which extends back to 123,000 years before the present, within the last interglacial period. The oxygen isotopes in the ice imply that climate was stable during the last interglacial period, with temperatures 5 °C warmer than today. We find unexpectedly large temperature differences between our new record from northern Greenland and the undisturbed sections of the cores from central Greenland, suggesting that the extent of ice in the Northern Hemisphere modulated the latitudinal temperature gradients in Greenland. This record shows a slow decline in temperatures that marked the initiation of the last glacial period. Our record reveals a hitherto unrecognized warm period initiated by an abrupt climate warming about 115,000 years ago, before glacial conditions were fully developed. This event does not appear to have an immediate Antarctic counterpart, suggesting that the climate see-saw between the hemispheres (which dominated the last glacial period) was not operating at this time.
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National Highway Traffic Safety Administration, Office of Vehicle Safety Compliance, Washington, D.C.
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Includes advertising material at end.
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Includes index.
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Includes index.
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"Scale, protractor and square" in pocket on end lining-paper of each volume.
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Includes section "Directories and statistics".