Authors

Paleoclimatic variability inferred from the spectral analysis of Greenland and Antarctic ice-core data •,4 j jouzel,1 • L. D Meeker,. P. Yiou, 1 K. Fuhrer,. S. Johnsen, •'6 and P. A. Mayewski • Abstract. PMeoclimate variations occur at various time scales, between a few centuries for the Heinrich events and several hundreds of millenia for the glacial to interglacial variations. The recent ice cores from Greenland (Greenland Ice Core Project and Greenland Ice Sheet Project 2) and Antarctica (Vostok) span at least one glacial oscillation and provide many opportunities to investigate climate variations with a very fine resolution. The joint study of cores from both hemispheres allows us to distinguish between the sources of variability and helps to propose mechanisms of variations for the different time scales involved. The climate proxies we analyze are inferred from •1sO and •D for temperature and chemical species (such as calcium) for the joint behavior of the major ions in the atmosphere, which yield an estimate of the polar circulation index. Those dat