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  • 1
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    Fluid inclusion oxygen and hydrogen stable isotopes in a speleothem from Susah Cave, Libya (2019)
    PANGAEA
    In:  Supplement to: Rogerson, Mike; Dublyansky, Yuri; Hoffmann, Dirk L; Luetscher, Marc; Spötl, Christoph; Töchterle, Paul (2018): Enhanced Mediterranean water cycle explains increased humidity during MIS 3 in North Africa. Climate of the Past, 1-31, https://doi.org/10.5194/cp-2018-134
    Details
    Publication Date: 2023-01-30
    Description: Fluid inclusion isotopes for a speleothem from Libya
    Keywords: AGE; Al Akhdar massif, Cyrenaica, Libya; fluid inclusion; isotope; Original value; Sample ID; Sample mass; SC-06-01; speleothem; Speleothem, water content; Speleothem sample; SPS; Susah Cave; Volume; δ18O, water; δ Deuterium, water
    Type: Dataset
    Format: text/tab-separated-values, 343 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    (Table 2) Age determination of sediment cores from the Portuguese Margin (2014)
    PANGAEA
    In:  Supplement to: Rogerson, Mike; Rohling, Eelco J; Weaver, Philip PE (2006): Promotion of meridional overturning by Mediterranean-derived salt during the last deglaciation. Paleoceanography, 21(4), PA4101, https://doi.org/10.1029/2006PA001306
    Details
    Publication Date: 2023-02-07
    Description: We demonstrate that changes in the behavior of the Mediterranean Outflow Water (MOW) prior to and through the last deglaciation played an important role in promoting Meridional Overturning Circulation (MOC). Estimation of past MOW salt and heat fluxes indicates that they gradually increased through the last deglaciation. Between 17.5 and 14.6 thousand years ago (ka B.P., where B.P. references year 1950), net evaporation from the Mediterranean exported sufficient fresh water from the North Atlantic catchment to cause an average salinity increase of 0.5 psu throughout the upper 2000 m of the entire North Atlantic to the north of 25°N. Combined with rapid intensification and shoaling of the MOW plume, which we identify around 15-14.5 ka B.P., this deglacial MOW-related salt accumulation preconditioned the North Atlantic for abrupt resumption of the MOC at 14.6 ka B.P.
    Keywords: Age, 14C AMS; Age, 14C milieu/reservoir corrected (-400 yr); Age, dated; Age, dated standard deviation; Calendar age; D13686; D13896; D13900; D249; DEPTH, sediment/rock; Discovery (1962); Elevation of event; Event label; Laboratory code/label; Latitude of event; Longitude of event; PC; Piston corer; Portuguese Margin
    Type: Dataset
    Format: text/tab-separated-values, 32 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    (Table 2) Age determination of sediment cores from the Gulf of Cadiz
    PANGAEA
    In:  Supplement to: Rogerson, Mike; Rohling, Eelco J; Weaver, Philip PE; Murray, John W (2005): Glacial to interglacial changes in the settling depth of the Mediterranean Outflow plume. Paleoceanography, 20(3), PA3007, https://doi.org/10.1029/2004PA001106
    Details
    Publication Date: 2023-05-12
    Description: We present micropalaeontological and grain-size records for a set of sediment cores from the Gulf of Cadiz (southwest Spain) that reflect changes in the position and strength of the Mediterranean Outflow (MO) current. The cores sample a sediment drift (the Gil Eanes Drift) that is positioned lower on the slope in the Gulf of Cadiz than the position of the main current today. The data indicate that the drift is of glacial age and that the glacial MO current was positioned lower on the slope than today but also that it was active over a considerably reduced area of the slope. We argue that this observation is consistent with physical constraints on the Gibraltar Exchange and on the likely settling and spreading behavior of the MO plume along the Iberian Margin under glacial environmental and sea level conditions. The deeper settling of the MO is likely to have influenced the formation of glacial North Atlantic Intermediate Water and also may have exerted indirect influence on the formation of glacial North Atlantic Deep Water.
    Keywords: Age, 14C AMS; Age, 14C milieu/reservoir corrected (-400 yr); Age, comment; Age, dated; Age, dated standard deviation; Calendar age; D13686; D13892; D13898; D249; DEPTH, sediment/rock; Discovery (1962); Event label; Giant piston corer; GPC; KAL; Kasten corer; PC; Piston corer; Portuguese Margin
    Type: Dataset
    Format: text/tab-separated-values, 62 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    Timing and causes of North African wet phases during the last glacial period and implications for modern human migration (2016)
    Nature Research
    In:  Scientific Reports, 6 (36367).
    Details
    Publication Date: 2019-02-01
    Description: We present the first speleothem-derived central North Africa rainfall record for the last glacial period. The record reveals three main wet periods at 65-61 ka, 52.5-50.5 ka and 37.5-33 ka that lead obliquity maxima and precession minima. We find additional minor wet episodes that are synchronous with Greenland interstadials. Our results demonstrate that sub-tropical hydrology is forced by both orbital cyclicity and North Atlantic moisture sources. The record shows that after the end of a Saharan wet phase around 70 ka ago, North Africa continued to intermittently receive substantially more rainfall than today, resulting in favourable environmental conditions for modern human expansion. The encounter and subsequent mixture of Neanderthals and modern humans – which, on genetic evidence, is considered to have occurred between 60 and 50 ka – occurred synchronously with the wet phase between 52.5 and 50.5 ka. Based on genetic evidence the dispersal of modern humans into Eurasia started less than 55 ka ago. This may have been initiated by dry conditions that prevailed in North Africa after 50.5 ka. The timing of a migration reversal of modern humans from Eurasia into North Africa is suggested to be coincident with the wet period between 37.5 and 33 ka.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    DOI: 10.1038/srep36367
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Were Rivers Flowing across the Sahara During the Last Interglacial? Implications for Human Migration through Africa (2013)
    Public Library of Science
    In:  PLoS ONE, 8 (9). e74834.
    Details
    Publication Date: 2020-10-21
    Description: Human migration north through Africa is contentious. This paper uses a novel palaeohydrological and hydraulic modelling approach to test the hypothesis that under wetter climates c.100,000 years ago major river systems ran north across the Sahara to the Mediterranean, creating viable migration routes. We confirm that three of these now buried palaeo river systems could have been active at the key time of human migration across the Sahara. Unexpectedly, it is the most western of these three rivers, the Irharhar river, that represents the most likely route for human migration. The Irharhar river flows directly south to north, uniquely linking the mountain areas experiencing monsoon climates at these times to temperate Mediterranean environments where food and resources would have been abundant. The findings have major implications for our understanding of how humans migrated north through Africa, for the first time providing a quantitative perspective on the probabilities that these routes were viable for human habitation at these times
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1371/journal.pone.0074834
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    Out of Africa: the importance of rivers as human migration corridors (2013)
    In:  [Poster] In: AGU Fall Meeting 2013, 09.-13.12.2013, San Francisco, USA .
    Details
    Publication Date: 2016-10-05
    Type: Conference or Workshop Item , NonPeerReviewed
    Format: text
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    OceanRep: Poster
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