Eccentricity forcing of Pliocene early Pleistocene climate revealed in a marine oxygen-isotope record

被引:96
作者
Clemens, SC [1 ]
Tiedemann, R [1 ]
机构
[1] UNIV KIEL,GEOMAR,FORSCHUNGSZENTRUM MARINE GEOWISSENSCH,D-24148 KIEL,GERMANY
关键词
D O I
10.1038/385801a0
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Milankovitch theory-that climate is controlled by variations in the Earth's orbital parameters-has gained wide acceptance for its ability to account for two climate cycles: a 23-kyr cycle that is phase-locked to the precession-driven insolation cycle, and a 41-kyr cycle that is phase-locked to the obliquity-driven insolation cycle(1-6). But, explaining the observed similar to 100-kyr climate cycle in terms of Milankovitch theory-especially for the Late Pleistocene ice-age cycle-remains controversial in spite of a strong correlation with the similar to 100-kyr cycle in the Earth's orbital eccentricity(5). One problem is that eccentricity affects insolation mainly by modulating the precession cycle; its direct contribution to radiation change is too small (<0.1%) to effect the observed climate change directly(5,7). Another is the absence of a Late Pleistocene ice-volume cycle in oxygen-isotope records to match the similar to 404-kyr component of the eccentricity cycle(5,8). Here we examine an oxygen-isotope record spanning the interval 1.2 to 5.2 million years ago, before the Late Pleistocene ice-age regime. We find 404-kyr and similar to 100-kyr climate cycles which are coherent with eccentricity and which have amplitudes that are similar to the coexisting 23-kyr cycle. Analysis of these low-frequency cycles suggests that they originate through an asymmetrical response mechanism that preferentially introduces variance into the climate system from the warmer portions of the eccentricity-modulated precession cycle. Our data thus support eccentricity's role in the origin of low-frequency oxygen-isotope cycles before the Late Pleistocene ice age.
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页码:801 / 804
页数:4
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