High Southern native Crosta

Core/Site name:

Adélie Land


East Antarctica




marine sediments (downcore)

Proxy measurement:

diatoms abundance

Sampling resolution:


Climate sensitivity:

water T

Dating resolution:


Dating information:



1000 cal yr BP


10843 cal yr BP

All uncertainties:

For details on the depth age model refer to the original publication (Crosta et al., 2007)


Diatom data from a marine sediment core give insight on Holocene changes in sea-surface conditions and climate at high southern latitudes off Adélie Land, East Antarctica. The early to mid-Holocene was warmer than the late Holocene with a transition at ~4000 calendar years B. P. Sea ice was less present and spring-summer growing season was greater during the warm period relative to the cold one, thus limiting sea ice diatom production and favoring more open ocean diatom to develop. The long-term Holocene climatic evolution in East Antarctica is explained by a combination of a delayed response to local seasonal insolation changes coupled to the long memory of the Southern Ocean. Abrupt variations of the diatom relative abundances, indicating rapid climate changes, are superimposed to the Holocene long-term trends. Spectral analyses calculate robust frequencies at ~1600 a (where ¿a¿ is years), ~1250 a, ~1050 a, ~570 a, ~310 a, ~230 a, ~150¿125 a, ~110 a, ~90 a, and ~66 a. Such periods are very close to solar activity cyclicities, except for the periods at ~310 a and ~1250 a, which are close to internal climate variability cyclicities. Wavelet analyses estimate the same periods but indicate nonstationary cyclicities. Rapid climate changes at high southern latitudes may therefore be explained by a combination of external (solar) and internal (thermohaline circulation) forcings.

Data entered by name:

Colombaroli, Daniele

Data entered by email:

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Main reference(s):

Crosta, X., M. Debret, D. Denis, M.A. Courty, and O. Ther. 2007. Holocene long- and short-term climate changes off Adélie Land, East Antarctica. Geochem. Geophys. Geosyst., 8 (11), Q11009, doi: 10.1029/2007GC001718.

Data storage link 1:


Current dating method:

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Annual snow acc rate:

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Category: Ocean2k