Rainfall regimes of the Green Sahara

Tierney, Jessica E.; Pausata, Francesco S. R.; deMenocal, Peter B

doi:10.1126/sciadv.1601503

Sci. Adv.

2017

DOI: 10.1126/sciadv.1601503

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Rainfall regimes of the Green Sahara

Jessica E. Tierney

¹

,

Francesco S. R. Pausata

²

,

Peter B deMenocal

³

Abstract: We estimate rainfall during the “Green Sahara” period.

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Cited by 406 publications

(403 citation statements)

References 101 publications

Supporting

34

Mentioning

363

Contrasting

4

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2

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“…The 87 Sr/ 86 Sr analyses largely agree with δ 18 O-based salinity estimations, and provide additional indications for significant precipitation across the NW African hinterland after the suggested abrupt aridification event around 5.5 ka BP. Our data are consistent with the precipitation reconstructions of Tierney et al (2017), which also indicate the persistence of considerable rainfall until ∼3-4 ka BP. Moreover, our record is coherent with the local occupation history in the Ras el Sass area that was abandoned at ∼3 ka BP, most likely as a consequence of decreasing surface freshwater availability (Vernet and Tous, 2004).…”

Section: Resultssupporting

confidence: 89%

Pronounced Northwest African Monsoon Discharge During the Mid- to Late Holocene

Höpker

¹

,

Wu

²

,

Müller

³

et al. 2019

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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.

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“…The 87 Sr/ 86 Sr analyses largely agree with δ 18 O-based salinity estimations, and provide additional indications for significant precipitation across the NW African hinterland after the suggested abrupt aridification event around 5.5 ka BP. Our data are consistent with the precipitation reconstructions of Tierney et al (2017), which also indicate the persistence of considerable rainfall until ∼3-4 ka BP. Moreover, our record is coherent with the local occupation history in the Ras el Sass area that was abandoned at ∼3 ka BP, most likely as a consequence of decreasing surface freshwater availability (Vernet and Tous, 2004).…”

Section: Resultssupporting

confidence: 89%

Pronounced Northwest African Monsoon Discharge During the Mid- to Late Holocene

Höpker

¹

,

Wu

²

,

Müller

³

et al. 2019

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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“…Thus, it seems possible that post-highstand Bosumtwi δ D wax may be partly biased by input of pre-aged leaf waxes, which could explain the difference to the GeoB4905-4 δ D wax record. Offshore NW Africa, δ D wax records have shown wet conditions during the AHP; in particular core GC37 displays aridification at about 5.5 ka 9 , similar to our record. This was interpreted as a rapid response at the AHP termination, although bioturbation was thought to be significant in these lower-resolution records, making direct comparisons difficult.…”

Section: Resultssupporting

confidence: 87%

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

Collins

¹

,

Prange

²

,

Caley

³

et al. 2017

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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.

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“…Using the results from EC-Earth, we found that the orbit-induced Saharan vegetation collapse could affect this climate transition from humid to more arid conditions over the ME at the end of mid-Holocene. Some previous studies suggested that the ME precipitation can be affected by the Afro-Asian monsoon during the mid-Holocene (i.e., Wanner et al 2008), but we found that neither the change in North African summer monsoon (Tierney et al 2017) nor the Asian summer monsoon (Sun et al 2019) can reach the ME. Our modeling work provides a new perception for Accepted for publication in Journal of Climate.…”

Section: Discussioncontrasting

confidence: 92%

Middle East Climate Response to the Saharan Vegetation Collapse during the Mid-Holocene

Sun

¹

,

Wang

²

,

Zhang

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

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