Journal cover Journal topic
Climate of the Past An interactive open-access journal of the European Geosciences Union
doi:10.5194/cp-2016-107
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
16 Nov 2016
Review status
A revision of this discussion paper was accepted for the journal Climate of the Past (CP) and is expected to appear here in due course.
Decadal resolution record of Oman margin upwelling indicates persistent solar forcing of the Indian summer monsoon after the early Holocene summer insolation maximum
Philipp M. Munz1, Stephan Steinke2, Anna Böll3, Andreas Lückge4, Jeroen Groeneveld5, Michal Kucera5, and Hartmut Schulz1 1Department of Geosciences, University of Tübingen, Hölderlinstr. 12, 72074 Tübingen, Germany
2Department of Geological Oceanography, Xiamen University, Xiping Building, Xiang’an South Road, Xiamen 361102, China
3Institute of Geology, University of Hamburg, Bundesstr. 55, 20146 Hamburg, Germany
4Bundesanstalt für Geowissenschaften und Rohstoffe (BGR), Stilleweg 2, 30655 Hannover, Germany
5MARUM – Center for Marine Environmental Sciences, Germany, Leobener Str., 28359 Bremen, Germany
Abstract. The Indian summer monsoon (ISM) brings most of the annual precipitation to the densely populated region in southern Asia. For the agricultural development and economic prosperity of the region, it is therefore vital to assess the variability of the monsoon system on societal relevant decadal- to centennial time scales. This might help to better understand how potential driving forces might be controlling ISM variability and how it might develop under future climate scenarios. Here we present a study of a sediment core from the northern Oman margin, revealing early- to mid Holocene ISM conditions on a near 20-year resolution. We assess multiple independent proxies indicative of sea surface temperatures (SST) during the upwelling season together with bottom water conditions. We use geochemical parameters, transfer functions of planktic foraminiferal assemblages and Mg/Ca paleothermometry and find evidence corroborating previous studies that upwelling intensity varies significantly in coherence to solar sunspot cycles. The dominant ~80–90-year Gleissberg cycle was apparently also affecting bottom water oxygen conditions. Although the interval from 8.4 to 5.8 ka B.P. is relatively short, the gradually decreasing trend of summer monsoon conditions was interrupted by short events of intensified ISM conditions. Results from both independent SST proxies are linked to phases of weaker OMZ conditions and enhanced carbonate preservation. This indicates that atmospheric forcing was intimately linked to bottom water properties and state of the OMZ on decadal time scales.

Citation: Munz, P. M., Steinke, S., Böll, A., Lückge, A., Groeneveld, J., Kucera, M., and Schulz, H.: Decadal resolution record of Oman margin upwelling indicates persistent solar forcing of the Indian summer monsoon after the early Holocene summer insolation maximum, Clim. Past Discuss., doi:10.5194/cp-2016-107, in review, 2016.
Philipp M. Munz et al.
Interactive discussionStatus: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version      Supplement - Supplement
 
RC1: 'Review on "Decadal resolution...." by Munz et al.', Anonymous Referee #1, 13 Dec 2016 Printer-friendly Version 
 
SC1: 'Longer-term Holocene context', Sebastian Luening, 18 Dec 2016 Printer-friendly Version 
 
RC2: 'Review', Anonymous Referee #2, 19 Dec 2016 Printer-friendly Version 
 
AC1: 'Authors response to cp-2016-107', Philipp Munz, 10 Mar 2017 Printer-friendly Version Supplement 
Philipp M. Munz et al.
Philipp M. Munz et al.

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Short summary
We present the results of several independent proxies of summer and upwelling SST from the Oman margin indicative of monsoon strength during the early Holocene. In combination with indices of carbonate preservation and bottom water redox conditions, we demonstrate that a persistent solar influence was modulating summer monsoon intensity. Furthermore, bottom water conditions are linked to atmospheric forcing, rather than changes of intermediate water masses.
We present the results of several independent proxies of summer and upwelling SST from the Oman...
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