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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Stable isotope records of Late Quaternary climate and hydrology from Mediterranean lakes: the ISOMED synthesis
Quaternary Science Reviews, Volume 27, No. 25-26, Year 2008
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Description
Lake isotope records can be used to assess the spatial coherency of Late Quaternary climate change across the circum-Mediterranean region. We place modern and palaeo-data within a simple conceptual lake response model to show that the isotope hydrology of most Mediterranean lakes has been influenced strongly by water balance, even in those systems that are chemically dilute (i.e. freshwater). δ18O data on biogenic and endogenic carbonates from 24 lake basins are used to reconstruct multi-millennial-scale trends since the LGM. While it is difficult to make direct comparisons between lake records in terms of single climatic parameters, coherent regional isotopic trends can be identified. During glacial times Mediterranean lakes deposited carbonates isotopically heavier in δ18O compared to the Holocene, partly due to source area effects. Isotopic enrichment was most marked during intervals corresponding to the H1 and Younger Dryas events, confirming that Late Pleistocene cold stages in the North Atlantic region were marked by aridity around much of the Mediterranean. Almost all Mediterranean lake records shifted to more depleted isotopic values during the Last Glacial-Interglacial Transition (LGIT). This shift is the reverse of the trend which characterised the same transition in lakes from northern and central Europe, and suggests that temperature changes were not an important direct driver of Mediterranean lake isotopic records over glacial-interglacial timescales. In the early Holocene, many lakes in the eastern part of the region were more depleted isotopically than in recent millennia. This corresponds with marine sapropel formation, both chronologically and geographically, and implies that increases in local rainfall contributed significantly to the creation of a freshwater lid and anoxia in the East Mediterranean Sea. In contrast, no such pattern is currently apparent from lake isotope records from the West Mediterranean, suggesting a possible NW-SE contrast in climate history during the Holocene. © 2008 Elsevier Ltd. All rights reserved.
Authors & Co-Authors
Roberts, Neil
United Kingdom, Plymouth
University of Plymouth
Jones, Matthew D.
United Kingdom, Nottingham
University of Nottingham
Benkaddour, Abdelfattah
Morocco, Marakech
Université Cadi Ayyad
Eastwood, Warren
United Kingdom, Birmingham
University of Birmingham
Filippi, M. L.
Italy, Trento
Mudeo Tridentino Di Scienze Naturali
Frogley, M. R.
United Kingdom, Brighton
University of Sussex
Lamb, Henry F.
United Kingdom, Aberystwyth
Aberystwyth University
Leng, Melanie J.
United Kingdom, Nottingham
University of Nottingham
United Kingdom, Nottingham
British Geological Survey
Reed, Jane M.
United Kingdom, Hull
University of Hull
Stein, Mordechai
Israel, Jerusalem
Geological Survey of Israel
Stevens, L.
United States, Long Beach
California State University, Long Beach
Valero-Garcés, B.
Spain, Zaragoza
Csic - Instituto Pirenaico de Ecología
Zanchetta, Giovanni
Italy, Pisa
Università Di Pisa
Statistics
Citations: 302
Authors: 13
Affiliations: 13
Identifiers
Doi:
10.1016/j.quascirev.2008.09.005
ISSN:
02773791
Research Areas
Environmental