The origin of the 1500-year climate cycles in Holocene North-Atlantic records

The origin of the 1500-year climate cycles in Holocene North-Atlantic records
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DOI:
10.5194/cp-3-569-2007
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发表时间:
2007-01-01
影响因子:
4.3
通讯作者:
Trentesaux, A.
Trentesaux, A.
中科院分区:
地球科学2区
文献类型:
--
作者:
Debret, M.;Bout-Roumazeilles, V.;Trentesaux, A.

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自从第一次提出冰川进退有1500年的周期以来(丹顿和卡伦,1973年),许多研究发现了2500年、1500年和1000年气候反复振荡的证据。在末次冰期,1500年的自然气候周期似乎是持续的(Bond和Lotti,1995年),而且非常有规律(Mayewski等人,一九九七年; Rahmstorf,2003),然而,在全新世这种节奏的起源仍然是一个谜(Rahmstorf,2003),使其成为气候变化的突出难题之一。太阳的变化往往被认为是可能负责这种周期性,但太阳强迫的证据是很难评估现有的数据系列,由于传统的时间序列分析的缺点。然而,小波分析方法是适当的,当考虑非平稳变异。在这里,我们表明,使用小波分析,它是可能的,以区分太阳强迫1000年和2500年的振荡海洋强迫1500年的周期。使用这种方法,太阳相关的和海洋相关的气候影响的相对贡献,可以区分整个10 000年的全新世间隔以来的最后一个冰期。这些结果表明,1500年的气候周期与海洋环流有关,而不是像以前所说的那样与太阳输出的变化有关(Bond等人,2001年)。因此,以前研究的海洋沉积物(比安奇和McCave,1999年; Chapman和Shackleton,2000年; Giraudeau等人,2000年),冰芯(奥布莱恩等人,1995; Vonmoos等人,2006)和灰尘记录(杰克逊等人,2005)可以看出,包含的证据,其相对影响在全新世的过程中变化的联合强迫机制。环大西洋气候记录不能完全用太阳强迫来解释,而是需要海洋环流的变化,正如以前所建议的那样(Broecker等人,2001; McManus等人,1999年)。
Since the first suggestion of 1500-year cycles in the advance and retreat of glaciers (Denton and Karlen, 1973), many studies have uncovered evidence of repeated climate oscillations of 2500, 1500, and 1000 years. During last glacial period, natural climate cycles of 1500 years appear to be persistent (Bond and Lotti, 1995) and remarkably regular (Mayewski et al., 1997; Rahmstorf, 2003), yet the origin of this pacing during the Holocene remains a mystery (Rahmstorf, 2003), making it one of the outstanding puzzles of climate variability. Solar variability is often considered likely to be responsible for such cyclicities, but the evidence for solar forcing is difficult to evaluate within available data series due to the shortcomings of conventional time-series analyses. However, the wavelets analysis method is appropriate when considering non-stationary variability. Here we show by the use of wavelets analysis that it is possible to distinguish solar forcing of 1000- and 2500- year oscillations from oceanic forcing of 1500-year cycles. Using this method, the relative contribution of solar-related and ocean-related climate influences can be distinguished throughout the 10 000 yr Holocene intervals since the last ice age. These results reveal that the 1500-year climate cycles are linked with the oceanic circulation and not with variations in solar output as previously argued (Bond et al., 2001). In this light, previously studied marine sediment (Bianchi and McCave, 1999; Chapman and Shackleton, 2000; Giraudeau et al., 2000), ice core (O'Brien et al., 1995; Vonmoos et al., 2006) and dust records (Jackson et al., 2005) can be seen to contain the evidence of combined forcing mechanisms, whose relative influences varied during the course of the Holocene. Circum-Atlantic climate records cannot be explained exclusively by solar forcing, but require changes in ocean circulation, as suggested previously (Broecker et al., 2001; McManus et al., 1999).