Centennial to decadal vegetation community changes linked to orbital and solar forcing during the Dan-C2 hyperthermal event

Centennial to decadal vegetation community changes linked to orbital and solar forcing during the Dan-C2 hyperthermal event
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Dan-C2 高温事件期间与轨道和太阳强迫相关的百年至十年植被群落变化

DOI:
10.1144/jgs2017-022
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发表时间:
2017
影响因子:
2.7
通讯作者:
Jolley D
Jolley D
中科院分区:
地球科学2区
文献类型:
--
作者:
Jolley D

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乌克兰博尔特什陨石坑形成于K-PG边界附近,保存了400 米的湖泊沉积岩,其中包括早期大年丹-C2过热事件的记录。从这些沉积物中采集到的丰富的花粉、孢子和藻类产生了由c.21个 kyr轨道进动周期。在丹-C2高温事件开始时,新的、更高分辨率的采样发现了亚轨道周期OFC的植被群落生态的振荡。2 kyr,c.200年 和c.11 年。这分别与可能的Hallstatt、DeVreis-Suess和Schwabe太阳周期是一致的。从稀树草原到中等森林生态系统的快速转变是由C。21  进动,这种变化可能发生在<200 kyr年。在体制转变之前,以中湿和冬季湿润为主的植物群落之间的c.2dca kyr(即可能的 )振荡的强度增加,暗示着生态闪烁。补充材料:去势对应和变点分析、dca组的孢粉频率数据和核心照片可在http://www.dca/www.dca/cn获取。
Formed close to the K–Pg boundary, the Boltysh meteorite crater, Ukraine, preserves >400 m of lacustrine sedimentary rocks that include a record of the early Danian Dan-C2 hyperthermal event. Abundant pollen, spores and algae recovered from these sediments have yielded a cyclic record of plant ecology change paced byc. 21 kyr orbital precession cycles. New, higher resolution sampling across the inception of the Dan-C2 hyperthermal event has identified oscillations in vegetation community ecology at sub-orbital periods ofc. 2 kyr,c. 200 years andc. 11 years. These are consistent with possible Hallstatt, DeVreis–Suess and Schwabe solar cycles, respectively. Rapid regime shift from savanna to a mesic forest ecosystem was paced byc. 21 kyr precession, with the shift probably occurring in <200 years. Prior to regime shift,c. 2 kyr (i.e. possible Hallstatt) oscillations between mesic- and winterwet-dominated plant communities increased in intensity, suggestive of ecological flickering.Supplementary material:Detrended correspondence and changepoint analysis, palynological frequency data for DCA groups and core photographs are available at https://doi.org/10.6084/m9.figshare.c.3803893
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