Orbital and suborbital climate cycles recorded in terrestrial strata from the late Paleocene-early Eocene in the Subei Basin, East China

IF 4 1区 地球科学 Q1 GEOGRAPHY, PHYSICAL
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Abstract

Interannual-to millennial-scale climate cycles have been recognized in ancient sedimentary strata and may be closely associated with solar activity. However, the physical driving mechanisms of such cycles remain a mystery. To better understand the nature and evolution of suborbital cycles in ice-free conditions, we performed a quantitative analysis of high-resolution phosphorus (P), gray-scale values, and iron (Fe) data obtained from a core deposited in a mid-latitude lake (Funing Formation of the Subei Basin) during the Late Paleocene-Early Eocene. Time series analysis reveals evidence for ∼88-yr and ∼ 11-yr solar activity cycles in the gray value data, and ∼ 20-kyr precession cycles, ∼10-kyr half-precession cycles, and ∼ 2-kyr solar activity cycles in the Fe data. The data indicate that paleoclimate changes in the Subei Basin at this time were driven by both orbital and suborbital cycles. Amplitude modulation analysis suggests that ∼20-kyr precession modulated the amplitude of the observed 2-kyr cycles. It is inferred that the Earth's climate is driven not only by eccentricity-modulated precession cycle, but also by precession-modulated millennial cycles.

中国东部苏北盆地晚古新世-早始新世陆相地层中记录的轨道和亚轨道气候周期
在古代沉积地层中已经发现了年际到千年尺度的气候周期,这些周期可能与太阳活动密切相关。然而,这种周期的物理驱动机制仍然是一个谜。为了更好地了解无冰条件下亚轨道周期的性质和演化,我们对晚古新世-早始新世期间沉积于中纬度湖泊(苏北盆地阜宁地层)的岩心所获得的高分辨率磷(P)、灰度值和铁(Fe)数据进行了定量分析。时间序列分析表明,灰度数据中存在88年和11年的太阳活动周期,铁度数据中存在20年的前向周期、10年的半前向周期和2年的太阳活动周期。这些数据表明,此时苏北盆地的古气候变化是由轨道周期和亚轨道周期共同驱动的。振幅调制分析表明,∼20-kyr前向调制了观测到的2-kyr周期的振幅。据此推断,地球气候不仅受偏心率调制的前摄周期驱动,还受前摄调制的千年周期驱动。
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来源期刊
Global and Planetary Change
Global and Planetary Change 地学天文-地球科学综合
CiteScore
7.40
自引率
10.30%
发文量
226
审稿时长
63 days
期刊介绍: The objective of the journal Global and Planetary Change is to provide a multi-disciplinary overview of the processes taking place in the Earth System and involved in planetary change over time. The journal focuses on records of the past and current state of the earth system, and future scenarios , and their link to global environmental change. Regional or process-oriented studies are welcome if they discuss global implications. Topics include, but are not limited to, changes in the dynamics and composition of the atmosphere, oceans and cryosphere, as well as climate change, sea level variation, observations/modelling of Earth processes from deep to (near-)surface and their coupling, global ecology, biogeography and the resilience/thresholds in ecosystems. Key criteria for the consideration of manuscripts are (a) the relevance for the global scientific community and/or (b) the wider implications for global scale problems, preferably combined with (c) having a significance beyond a single discipline. A clear focus on key processes associated with planetary scale change is strongly encouraged. Manuscripts can be submitted as either research contributions or as a review article. Every effort should be made towards the presentation of research outcomes in an understandable way for a broad readership.
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