Evidence map›Paper›PMID 37684244›Full record

ArticleNature communications2023

North African humid periods over the past 800,000 years.

Edward Armstrong, Miikka Tallavaara, Peter O Hopcroft, Paul J Valdes

Abstract read
In one paragraph

Article in Nature communications, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.

0numbers the graph read from it
0cells of the map it votes in
8citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

8 citing papers in PubMed.

  1. Article
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors.

Edward ArmstrongDepartment of Geosciences and Geography, University of Helsinki, Helsinki, Finland. edward.armstrong@helsinki.fi.ORCID http://orcid.org/0000-0001-9561-0159
Miikka TallavaaraDepartment of Geosciences and Geography, University of Helsinki, Helsinki, Finland.ORCID http://orcid.org/0000-0001-9252-7309
Peter O HopcroftSchool of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, UK.ORCID http://orcid.org/0000-0003-3694-9181
Paul J ValdesSchool of Geographical Sciences, University of Bristol, Bristol, UK.ORCID http://orcid.org/0000-0002-1902-3283

Funding

Koneen Säätiö (Kone Foundation) 202006876
6 · The paper itself

Abstract

The Sahara region has experienced periodic wet periods over the Quaternary and beyond. These North African Humid Periods (NAHPs) are astronomically paced by precession which controls the intensity of the African monsoon system. However, most climate models cannot reconcile the magnitude of these events and so the driving mechanisms remain poorly constrained. Here, we utilise a recently developed version of the HadCM3B coupled climate model that simulates 20 NAHPs over the past 800 kyr which have good agreement with NAHPs identified in proxy data. Our results show that precession determines NAHP pacing, but we identify that their amplitude is strongly linked to eccentricity via its control over ice sheet extent. During glacial periods, enhanced ice-albedo driven cooling suppresses NAHP amplitude at precession minima, when humid conditions would otherwise be expected. This highlights the importance of both precession and eccentricity, and the role of high latitude processes in determining the timing and amplitude of the NAHPs. This may have implications for the out of Africa dispersal of plants and animals throughout the Quaternary.

Identifiers

PMID37684244
PMCPMC10491769

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.