Equatorial insolation:: from precession harmonics to eccentricity frequencies
Equatorial insolation:: from precession harmonics to eccentricity frequencies
复制标题
DOI：
10.5194/cp-2-131-2006
复制
发表时间：
2006-01-01
影响因子：
4.3
通讯作者：
Melice, J. L.
中科院分区：
文献类型：
--
作者：
Berger, A.;Loutre, M. F.;Melice, J. L.
自Hays等人（1976）的论文发表以来，对气候代用指标记录的谱分析提供了大量证据，表明在地磁和岁差变化的频率范围内，气候变化的一小部分是由日照变化驱动的。然而，正是以10万年为中心的方差分量主导了大多数上更新世气候记录，尽管在接近10万年的偏心率驱动时期（主要是95万年和123万年时期）的日射扰动量太小，不足以直接引起冰期幅度的气候变化。在过去的几十年里，人们试图在气候记录中找到解释这一100 kyr周期的方法。在这里，我们表明，双重最大的特点，每天在热带纬度地区收到的辐射在一年的过程中，是起源于赤道日射不仅强95 kyr和123 kyr的周期与偏心率，但也有11 kyr和5.5 kyr的周期与岁差。
Since the paper by Hays et al. (1976), spectral analyses of climate proxy records provide substantial evidence that a fraction of the climatic variance is driven by insolation changes in the frequency ranges of obliquity and precession variations. However, it is the variance components centered near 100 kyr which dominate most Upper Pleistocene climatic records, although the amount of insolation perturbation at the eccentricity driven periods close to 100-kyr (mainly the 95 kyr- and 123 kyr-periods) is much too small to cause directly a climate change of ice-age amplitude. Many attempts to find an explanation to this 100-kyr cycle in climatic records have been made over the last decades. Here we show that the double maximum which characterizes the daily irradiation received in tropical latitudes over the course of the year is at the origin in equatorial insolation of not only strong 95 kyr and 123 kyr periods related to eccentricity, but also of a 11-kyr and a 5.5-kyr periods related to precession.