Rapid termination of the African Humid Period triggered by northern high-latitude cooling

Collins, James A; Prange, Matthias; Caley, T.; Gimeno, Luís; Beckmann, Britta; Mulitza, Stefan; Skonieczny, Charlotte; Roche, Didier M.; Schefuß, Enno

doi:10.1038/s41467-017-01454-y

Nat Commun

2017

DOI: 10.1038/s41467-017-01454-y

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Rapid termination of the African Humid Period triggered by northern high-latitude cooling

James A Collins

¹

,

Matthias Prange

²

,

T. Caley

³

et al.

Abstract: The rapidity and synchrony of the African Humid Period (AHP) termination at around 5.5 ka are debated, and it is unclear what caused a rapid hydroclimate response. Here we analysed the hydrogen isotopic composition of sedimentary leaf-waxes (δDwax) from the Gulf of Guinea, a proxy for regional precipitation in Cameroon and the central Sahel-Sahara. Our record indicates high precipitation during the AHP followed by a rapid decrease at 5.8–4.8 ka. The similarity with a δDwax record from northern East Africa sugg… Show more

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Cited by 100 publications

(62 citation statements)

References 92 publications

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“…2), an increase that probably started some centuries before, according to superregional dust reconstructions (12,16) and climate simulations (28,29), and that continues today, as indicated by present-day data from the studied cave. Such a net increase is consistent with the long-term desertification process experienced by northern Africa, including the Sahara and the Sahel, starting around 5.5 ka BP with the rapid demise of the AHP (~11.7 to 5 ka BP) (33)(34)(35), and continuing more gradually over the remainder of the Holocene (13). During these later millennia, the progressive aridification in northern Africa is reflected by lake levels (8,36), vegetation changes (37), human settlements (38), and dust fluxes over the northwest African margin (12,14,15,33) (Fig.…”

Section: Long-term Saharan Dust Increasesupporting

confidence: 75%

Strong links between Saharan dust fluxes, monsoon strength, and North Atlantic climate during the last 5000 years

Cruz¹,

McDermott²,

Jiménez

³

et al. 2021

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Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.

show abstract

“…2), an increase that probably started some centuries before, according to superregional dust reconstructions (12,16) and climate simulations (28,29), and that continues today, as indicated by present-day data from the studied cave. Such a net increase is consistent with the long-term desertification process experienced by northern Africa, including the Sahara and the Sahel, starting around 5.5 ka BP with the rapid demise of the AHP (~11.7 to 5 ka BP) (33)(34)(35), and continuing more gradually over the remainder of the Holocene (13). During these later millennia, the progressive aridification in northern Africa is reflected by lake levels (8,36), vegetation changes (37), human settlements (38), and dust fluxes over the northwest African margin (12,14,15,33) (Fig.…”

Section: Long-term Saharan Dust Increasesupporting

confidence: 75%

Strong links between Saharan dust fluxes, monsoon strength, and North Atlantic climate during the last 5000 years

Cruz¹,

McDermott²,

Jiménez

³

et al. 2021

Get access via publisher Add to dashboard Cite

Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.

show abstract

“…Based on this regional reference SST record, we are unable to detect any evidence for an abrupt SST change in the Gulf of Guinea associated with the LHRC, ruling out an oceanic control. Furthermore, marine records from the region do not show change in the hydrology at the time of the LHRC (41,46). Further indications for limited hydrological change (including change in precipitation seasonality) during the LHRC are presented in SI Appendix.…”

Section: Discussionmentioning

confidence: 90%

Early anthropogenic impact on Western Central African rainforests 2,600 y ago

Garcin

¹

,

Deschamps

²

,

Ménot

³

et al. 2018

Proc. Natl. Acad. Sci. U.S.A.

Self Cite

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Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.

show abstract

“…The abrupt or progressive nature, and the exact age of the beginning and end of the "African Humid Period" are, however, still debated (deMenocal et al, 2000;Hoelzmann et al, 2004;Gasse et al, 2008;Tierney and deMenocal, 2013;Foerster et al, 2012;Shanahan et al, 2015;Gatto and Zerboni, 2015;Collins et al, 2017). Unfortunately, our dates are too sparse to allow us to specify this point.…”

Section: Comparison With Other Areas and Discussionmentioning

confidence: 95%

Sedimentary and paleobiological records of the latest Pleistocene-Holocene climate evolution in the Kordofan region, Sudan

Dawelbeit

¹

,

Jaillard

²

,

Eisawi

³

2019

Journal of African Earth Sciences

Get access via publisher Add to dashboard Cite

Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.

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