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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Holocene ITCZ and Indian monsoon dynamics recorded in stalagmites from Oman and Yemen (Socotra)
Quaternary Science Reviews, Volume 26, No. 1-2, Year 2007
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Description
High-resolution oxygen isotope (δ18O) profiles of Holocene stalagmites from four caves in Northern and Southern Oman and Yemen (Socotra) provide detailed information on fluctuations in precipitation along a latitudinal transect from 12°N to 23°N. δ18O values reflect the amount of precipitation which is primarily controlled by the mean latitudinal position of the ITCZ and dynamics of the Indian summer monsoon (ISM). During the early Holocene rapidly decreasing δ18O values indicate a rapid northward displacement in the mean latitudinal position of the summer ITCZ and the associated ISM rainfall belt, with decadal- to centennial-scale changes in monsoon precipitation correlating well with high-latitude temperature variations recorded in Greenland ice cores. During the middle to late Holocene the summer ITCZ continuously migrated southward and monsoon precipitation decreased gradually in response to decreasing solar insolation, a trend, which is also recorded in other monsoon records from the Indian and East Asian monsoon domains. Importantly, there is no evidence for an abrupt middle Holocene weakening in monsoon precipitation. Although abrupt monsoon events are apparent in all monsoon records, they are short-lived and clearly superimposed on the long-term trend of decreasing monsoon precipitation. For the late Holocene there is an anti-correlation between ISM precipitation in Oman and inter-monsoon (spring/autumn) precipitation on Socotra, revealing a possible long-term change in the duration of the summer monsoon season since at least 4.5 ka BP. Together with the progressive shortening of the ISM season, gradual southward retreat of the mean summer ITCZ and weakening of the ISM, the total amount of precipitation decreased in those areas located at the northern fringe of the Indian and Asian monsoon domains, but increased in areas closer to the equator. © 2006 Elsevier Ltd. All rights reserved.
Authors & Co-Authors
Fleitmann, Dominik
Switzerland, Bern
University of Bern
Burns, Stephen J.
United States, Amherst
University of Massachusetts Amherst
Mangini, Augusto
Germany, Heidelberg
Heidelberger Akademie Der Wissenschaften
Mudelsee, Manfred
Germany, Leipzig
Universität Leipzig
Kramers, Jan Dirk
Switzerland, Bern
University of Bern
Villa, Igor Maria
Switzerland, Bern
University of Bern
Neff, Ulrich
Germany, Heidelberg
Heidelberger Akademie Der Wissenschaften
Al-Subbary, Abdulkarim
Yemen, Sana'a
Sana'a University
Buettner, Annett
Switzerland, Bern
University of Bern
Hippler, Dorothee
Switzerland, Bern
University of Bern
Matter, Albert
Switzerland, Bern
University of Bern
Statistics
Citations: 939
Authors: 11
Affiliations: 5
Identifiers
Doi:
10.1016/j.quascirev.2006.04.012
ISSN:
02773791