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Title: Climate and landscape change in Southeast Arabia from MIS 6 to MIS 3 : Implications for the dispersal of hominin populations
Author: Parton, Ash
Awarding Body: Oxford Brookes University
Current Institution: Oxford Brookes University
Date of Award: 2013
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Southeast Arabia is critically located with respect to both palaeoclimatic and archaeological studies. Periodic incursions of rainfall have transformed the arid interior of Arabia into one littered with lakes and active drainage systems, capable of supporting a wide variety of flora and fauna and facilitating the dispersal of early populations out of Africa. A number of palaeoclimatic records confirm that during mid-high latitude interglacial periods, a northward shift of the Intertropical Convergence Zone (lTCZ) and associated Indian Ocean summer Monsoon (IOSM) belt occurs when orbitally-controlled summer insolation is at a maximum, and glacial boundary conditions at a minimum. Our understanding of the Arabian climate during glacials, however, is restricted by a paucity of terrestrial archives and as such, it is believed that during these times, IOSM precipitation remains latitudinally depressed under increased glacial boundary conditions. To address this gap in our knowledge, this thesis provides a high-resolution multiproxy framework of climatically-driven landscape changes, based on palaeolake and alluvial fan sediment sequences situated in a medial -distal braid plain along the western flanks of the Hajar Mountains, UAE. The records from palaeolake Aqabah (JA08) and the Al Sibetah alluvial fan (ALS08), comprise the first detailed terrestrial records of increased rainfall during both glacial and interglacial periods, and provide the first multiproxy evidence of MIS 3 and MIS 6-dated humid periods in SE Arabia. These findings indicate that increases in the intensity and latitudinal position of the IOSM occur during both glacial and interglacial periods, in concurrence with NH insolation maxima, and that mid-high latitude glacial boundary conditions do not prevent monsoon incursion into SE Arabia. The evidence from these records suggests that the demographic expansion of early populations would not have been confined to MIS 5 humid periods, and that IOSM variability can not simply be viewed within the context of mid-high latitude glacial-interglacial cycles.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available