Abstract:
:The resemblance of the orbitally filtered isotope signal from the past 340 kyr in Antarctic ice cores to Northern Hemisphere summer insolation intensity has been used to suggest that the northern hemisphere may drive orbital-scale global climate changes. A recent Letter by Laepple et al. suggests that, contrary to this interpretation, this semblance may instead be explained by weighting the orbitally controlled Antarctic seasonal insolation cycle with a static (present-day) estimate of the seasonal cycle of accumulation. We suggest, however, that both time variability in accumulation seasonality and alternative stable seasonality can markedly alter the weighted insolation signal. This indicates that, if the last 340 kyr of Antarctic accumulation has not always looked like the estimate of precipitation and accumulation seasonality made by Laepple et al., this particular accumulation weighting explanation of the Antarctic orbital-scale isotopic signal might not be robust.
journal_name
Naturejournal_title
Natureauthors
Sime LC,Wolff EWdoi
10.1038/nature10613subject
Has Abstractpub_date
2011-11-09 00:00:00pages
E1-2; author reply E2-4issue
7372eissn
0028-0836issn
1476-4687pii
nature10613journal_volume
479pub_type
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