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          Institute: MPI für Chemie     Collection: Publikationen MPI für Chemie     Display Documents

ID: 675650.0, MPI für Chemie / Publikationen MPI für Chemie
Moroccan speleothem and tree ring records suggest a variable positive state of the North Atlantic Oscillation during the Medieval Warm Period
Authors:Wassenburg, J. A.; Immenhauser, A.; Richter, D. K.; Niedermayr, A.; Riechelmann, S.; Fietzke, J.; Scholz, D.; Jochum, K. P.; Fohlmeister, J.; Schröder-Ritzrau, A.; Sabaoui, A.; Riechelmann, D. F. C.; Schneider, L.; Esper, J.
Date of Publication (YYYY-MM-DD):2013-08-01
Title of Journal:Earth and Planetary Science Letters
Start Page:291
End Page:302
Review Status:Internal review
Audience:Experts Only
Abstract / Description:We present a magnesium (Mg) and strontium (Sr) record from an aragonitic speleothem (Grotte de Piste, Morocco, 34 degrees N; 04 degrees W) providing a reconstruction of effective rainfall from 619 to 1962 AD. The corresponding drip site was monitored over 2 yr for drip water Mg/Ca and Sr/Ca ratios. Results show evidence for prior aragonite precipitation, which can explain negative correlations between speleothem Mg and Sr concentrations. The data shown here have important climate implications concerning the evolution of the North Atlantic Oscillation (NAO). A comparison of the stalagmite data from Grotte de Piste with an updated tree ring based drought reconstruction from Morocco and other NAO related proxy records confirms that the Medieval Warm Period (MWP) was dominated by NAO(+) conditions. The stalagmite record and multiple proxy records from the Iberian Peninsula, however, suggest that considerable rainfall variability occurred during the MWP. This implies that the NAO has been more variable during the MWP than formerly suggested. (C) 2013 Elsevier B.V. All rights reserved.
External Publication Status:published
Document Type:Article
Version Comment:Automatic journal name synchronization
Communicated by:N. N.
Affiliations:MPI für Chemie
Identifiers:ISI:000324847300026 [ID No:1]
ISSN:0012-821X [ID No:2]
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