Universität zu Köln

Trauth, Martin H., Asrat, Asfawossen, Cohen, Andrew S., Duesing, Walter, Foerster, Verena, Kaboth-Bahr, Stefanie ORCID: 0000-0002-4449-2938, Kraemer, K. Hauke, Lamb, Henry F., Marwan, Norbert ORCID: 0000-0003-1437-7039, Maslin, Mark A. and Schaebitz, Frank (2021). Recurring types of variability and transitions in the similar to 620 kyr record of climate change from the Chew Bahir basin, southern Ethiopia. Quat. Sci. Rev., 266. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 1873-457X

Full text not available from this repository.

Abstract

The Chew Bahir Drilling Project (CBDP) aims to test possible linkages between climate and hominin evolution in Africa through the analysis of sediment cores that have recorded environmental changes in the Chew Bahir basin (CHB). In this statistical project we used recurrence plots (RPs) together with a recurrence quantification analysis (RQA) to distinguish two types of variability and transitions in the Chew Bahir aridity record and compare them with the ODP Site 967 wetness index from the eastern Mediterranean. The first type of variability is one of slow variations with cycles of similar to 20 kyr, reminiscent of the Earth's precession cycle, and subharmonics of this orbital cycle. In addition to these cyclical wet-dry fluctuations in the area, extreme events often occur, i.e. short wet or dry episodes, lasting for several centuries or even millennia, and rapid transitions between these wet and dry episodes. The second type of variability is characterized by relatively low variation on orbital time scales, but significant century-millennium-scale variations with progressively increasing frequencies. Within this type of variability there are extremely fast transitions between dry and wet within a few decades or years, in contrast to those within Type 1 with transitions over several hundreds of years. Type 1 variability probably reflects the influence of precessional forcing in the lower latitudes at times with maximum values of the long (400 kyr) eccentricity cycle of the Earth's orbit around the sun, with the tendency towards extreme events. Type 2 variability seems to be linked with minimum values of this cycle. There does not seem to be a systematic correlation between Type 1 or Type 2 variability with atmospheric CO2 concentration. The different types of variability and the transitions between those types had important effects on the availability of water, and could have transformed eastern Africa's environment considerably, which would have had important implications for the shaping of the habitat of H. sapiens and the direct ancestors of this species. (C) 2020 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Trauth, Martin H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Asrat, Asfawossen UNSPECIFIED UNSPECIFIED UNSPECIFIED Cohen, Andrew S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Duesing, Walter UNSPECIFIED UNSPECIFIED UNSPECIFIED Foerster, Verena UNSPECIFIED UNSPECIFIED UNSPECIFIED Kaboth-Bahr, Stefanie UNSPECIFIED orcid.org/0000-0002-4449-2938 UNSPECIFIED Kraemer, K. Hauke UNSPECIFIED UNSPECIFIED UNSPECIFIED Lamb, Henry F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Marwan, Norbert UNSPECIFIED orcid.org/0000-0003-1437-7039 UNSPECIFIED Maslin, Mark A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schaebitz, Frank UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-597120
DOI:	10.1016/j.quascirev.2020.106777
Journal or Publication Title:	Quat. Sci. Rev.
Volume:	266
Date:	2021
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication:	OXFORD
ISSN:	1873-457X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language AFRICAN HUMID PERIOD; RECURRENCE PLOTS; NORTHERN KENYA; EARTHS CLIMATE; EVOLUTION; ABRUPT; QUANTIFICATION; TERMINATION; OCCUPATION; SHIFTS Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/59712