Northeast Greenland Speleothems Trap Forest Pollen During MIS

Anika Donner, Jet Vessies,Laurent Marquer,Christoph Spötl,R. Lawrence Edwards,Gina E. Moseley

crossref（2024）

Cited 0|Views19

Abstract

Diminishing ice sheets, an intensification of the hydrological cycle, and shifts in vegetation composition and abundance, are some of the results of the Arctic’s amplified response to climate warming. Improved understanding of Arctic amplification can be achieved through investigation of past interglacial periods. Although an increasing number of studies exploring past interglacials in Greenland exist, northeastern Greenland remains under-investigated, despite being highly sensitive to the effects of Arctic amplification. Here, we investigate the palaeoenvironment under warmer and wetter climate conditions by using pollen trapped in speleothems that were deposited in northeastern Greenland (80°N, 22°W) during late Marine Isotope Stage (MIS) 11. The results are placed in the context of a sensitivity study into modern pollen compositions recorded in surface samples as well as published Holocene records from eastern and northern Greenland. The deposition of speleothems in northeastern Greenland during MIS 11 and the composition of the trapped pollen assemblages provide a first-order proxy for drastically different atmospheric and oceanic boundary conditions compared to today. Modern and Holocene pollen samples are dominated by open land vegetation (shrubs and herbs), whereas the MIS 11 speleothem-trapped pollen show an abundance of conifer trees, primarily fir and pine, as well as an array of deciduous trees, shrubs, and open land vegetation. These results are in agreement with findings from other studies investigating southern Greenland during MIS 11. The speleothems and trapped pollen used in this study thus provide direct terrestrial evidence for the presence of higher vegetation in northeastern Greenland during MIS 11 and indirectly help to constrain the extent of the ice sheet at that time.

Translated text

求助PDF

上传PDF

Bibtex

AI Read Science

AI Summary

AI Summary is the key point extracted automatically understanding the full text of the paper, including the background, methods, results, conclusions, icons and other key content, so that you can get the outline of the paper at a glance.

Example

Background

Key content

Introduction

Methods

Results

Related work

Fund

Key content

Pretraining has recently greatly promoted the development of natural language processing (NLP)
We show that M6 outperforms the baselines in multimodal downstream tasks, and the large M6 with 10 parameters can reach a better performance
We propose a method called M6 that is able to process information of multiple modalities and perform both single-modal and cross-modal understanding and generation
The model is scaled to large model with 10 billion parameters with sophisticated deployment, and the 10 -parameter M6-large is the largest pretrained model in Chinese
Experimental results show that our proposed M6 outperforms the baseline in a number of downstream tasks concerning both single modality and multiple modalities We will continue the pretraining of extremely large models by increasing data to explore the limit of its performance

Upload PDF to Generate Summary

Must-Reading Tree

Example

Generate MRT to find the research sequence of this paper

Data Disclaimer

The page data are from open Internet sources, cooperative publishers and automatic analysis results through AI technology. We do not make any commitments and guarantees for the validity, accuracy, correctness, reliability, completeness and timeliness of the page data. If you have any questions, please contact us by email: report@aminer.cn

Chat Paper

【要点】：研究利用东北格陵兰岛 MIS 11 时期的洞穴沉积物中的花粉记录，揭示了当时气候变暖和植被变化的状况，为理解北极放大效应提供了新的证据。

【方法】：通过分析东北格陵兰岛 MIS 11 时期洞穴中捕获的花粉组合，结合现代花粉组成和全新世记录，对比研究了过去气候和植被变化。

【实验】：在东北格陵兰岛（80°N, 22°W）的洞穴中收集了 MIS 11 时期的洞穴沉积物，并对其中的花粉组成进行了分析，发现 MIS 11 时期的花粉组合与现代和全新世花粉组合存在显著差异，表明当时该地区植被更为丰富，包括大量针叶树和阔叶树。