Universität zu Köln

Trauth, Martin H., Asrat, Asfawossen, Duesing, Walter, Foerster, Verena, Kraemer, K. Hauke, Marwan, Norbert ORCID: 0000-0003-1437-7039, Maslin, Mark A. and Schaebitz, Frank ORCID: 0000-0003-3879-9308 (2019). Classifying past climate change in the Chew Bahir basin, southern Ethiopia, using recurrence quantification analysis. Clim. Dyn., 53 (5-6). S. 2557 - 2573. NEW YORK: SPRINGER. ISSN 1432-0894

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Abstract

The Chew Bahir Drilling Project (CBDP) aims to test possible linkages between climate and evolution in Africa through the analysis of sediment cores that have recorded environmental changes in the Chew Bahir basin. In this statistical project we consider the Chew Bahir palaeolake to be a dynamical system consisting of interactions between its different components, such as the waterbody, the sediment beneath lake, and the organisms living within and around the lake. Recurrence is a common feature of such dynamical systems, with recurring patterns in the state of the system reflecting typical influences. Identifying and defining these influences contributes significantly to our understanding of the dynamics of the system. Different recurring changes in precipitation, evaporation, and wind speed in the Chew Bahir basin could result in similar (but not identical) conditions in the lake (e.g., depth and area of the lake, alkalinity and salinity of the lake water, species assemblages in the water body, and diagenesis in the sediments). Recurrence plots (RPs) are graphic displays of such recurring states within a system. Measures of complexity were subsequently introduced to complement the visual inspection of recurrence plots, and provide quantitative descriptions for use in recurrence quantification analysis (RQA). We present and discuss herein results from an RQA on the environmental record from six short (< 17 m) sediment cores collected during the CBDP, spanning the last 45 kyrs. The different types of variability and transitions in these records were classified to improve our understanding of the response of the biosphere to climate change, and especially the response of humans in the area.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Trauth, Martin H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Asrat, Asfawossen UNSPECIFIED UNSPECIFIED UNSPECIFIED Duesing, Walter UNSPECIFIED UNSPECIFIED UNSPECIFIED Foerster, Verena UNSPECIFIED UNSPECIFIED UNSPECIFIED Kraemer, K. Hauke UNSPECIFIED UNSPECIFIED UNSPECIFIED Marwan, Norbert UNSPECIFIED orcid.org/0000-0003-1437-7039 UNSPECIFIED Maslin, Mark A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schaebitz, Frank UNSPECIFIED orcid.org/0000-0003-3879-9308 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-143120
DOI:	10.1007/s00382-019-04641-3
Journal or Publication Title:	Clim. Dyn.
Volume:	53
Number:	5-6
Page Range:	S. 2557 - 2573
Date:	2019
Publisher:	SPRINGER
Place of Publication:	NEW YORK
ISSN:	1432-0894
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language AFRICAN HUMID PERIOD; HOLOCENE; EAST; VARIABILITY; ABRUPT; PLOTS; TERMINATION; OCCUPATION; EVOLUTION; RESPONSES Multiple languages Meteorology & Atmospheric Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/14312