Article (Scientific journals)
Paleoproductivity during the middle Miocene carbon isotope events: A data-model approach
Diester-Haass, Liselotte; Billups, Katharina; Jacquemin, Ingrid et al.
2013In Paleoceanography, 28, p. 334-346
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Keywords :
Mid-Miocene; ocean productivity; carbon cycle; carbon isotopic composition; Milankovitch cycles
Abstract :
[en] To what extent are individual middle Miocene eccentricity-scale benthic foraminiferal carbon isotope maxima (the so-called CM events) related to changes in marine export productivity? Here we use benthic foraminiferal accumulation rates from three sites in the Pacific and Southern Oceans and a geochemical box model to assess relationships between benthic foraminiferal δ13C records, export productivity, and the global carbon cycle. Results from Deep Sea Drilling Project Hole 588 and Ocean Drilling Program Site 747 show a distinct productivity maximum during CM 6 at 13.8 Ma, the time of major expansion of ice on Antarctica. Productivity maxima during other CM events are only recorded at high-latitude Site 747. A set of numerical experiments tests whether changes in foraminiferal δ13C records (CM events) and export productivity can be simulated solely by sea level fluctuations and the associated changes in global weathering-deposition cycles, by sea level fluctuations plus global climatic cooling, and by sea level fluctuations plus invigorated ocean circulation. Consistent with data, the periodic forcing of sea level and albedo (and associated weathering cycles) produces δ13C variations of the correct temporal spacing, albeit with a reduced amplitude. A productivity response of the correct magnitude is achieved by enhancing ocean circulation during cold periods. We suggest that the pacing of middle Miocene δ13C fluctuations is associated with cyclical sea level variations. The amplitude, however, is muted perhaps due to the competing effects of a time-lagged response to sea level lowstands but an immediate response to invigorated ocean circulation during cold phases.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Diester-Haass, Liselotte;  Universität des Saarlandes, Germany > Zentrum für Umweltwissenschaften
Billups, Katharina
Jacquemin, Ingrid ;  Université de Liège - ULiège > DER Sc. et gest. de l'environnement (Arlon Campus Environ.) > Agrométéorologie (relation agriculture-environ. physique)
Emeis, Kay C.
Lefebvre, Vincent
François, Louis  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Modélisation du climat et des cycles biogéochimiques
Language :
English
Title :
Paleoproductivity during the middle Miocene carbon isotope events: A data-model approach
Publication date :
2013
Journal title :
Paleoceanography
ISSN :
0883-8305
eISSN :
1944-9186
Publisher :
American Geophysical Union, Washington, United States - District of Columbia
Volume :
28
Pages :
334-346
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 10 July 2013

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