Changing habitats of calcareous plankton in the Greenhouse World| Projektleitung: | Dr. rer. nat. Joachim Schönfeld | | Beteiligte: | Dipl.-Geol. Almuth Harbers, Prof. Dr. Frank Melzner, Prof. Dr. rer. nat. Ulf Riebesell, Prof. Dr. rer. nat. Wolf-Christian Dullo, Prof. Dr. rer. nat. Anton Eisenhauer, Dr. rer. nat. Hanno Kinkel, Prof. Dr. rer. nat. Wolfgang Kuhnt, Prof. Dr. rer. nat. Michael Kucera | | Förderer: | Exzellenzcluster "Ozean der Zukunft" | Mitwirkende
Institutionen: |
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| Universität Kiel | | Universität Tübingen | | Laufzeit: | 1.9.2007 - 30.8.2009 | | Inhalt und Ziele: | The objectives of our research project are to document historical changes in
the assemblage composition and habitat depth of calcareous planktonic
organisms in relation to changes in the physical and chemical parameters and
stratification of the surface ocean due to recent global warming. Changes in
the size, weight, chemical, and isotopic composition of carbonate shells are
to be assessed. The main focus of the investigation is on planktonic
foraminifers and pteropods.
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SFB754 - A7: Ursachen und zeitlicher Verlauf von Einsetzen und Ausbreitung anoxischer Verhältnisse im Kreide-Ozean| Projektleitung: | Prof. Dr. rer. nat. Wolfgang Kuhnt, Prof. Dr. rer. nat. Klaus Wallmann | | Förderer: | Deutsche Forschungsgemeinschaft | | Laufzeit: | 1.1.2008 - 31.12.2011 | | Inhalt und Ziele: | Einsetzen und Ausbreitung kretazischer anoxischer Events sollen als Modell für zukünftige Änderungen des Ozeansystems aufgrund globaler Erwärmung und Meeresspiegelanstiegs untersucht werden. Der genaue zeitliche und räumliche Ablauf der Ausbreitung der Anoxia sowie mögliche Rückkopplungsmechanismen wie die Freisetzung von Nährstoffen durch kontinentale Verwitterung und marine Anoxia sollen hochauflösend in den Anfangsphasen der beiden bedeutendsten kretazischen anoxischen Ereignisse (OAE1a im Unter-Apt ~119 Ma und OAE2 im Ober-Cenoman ~94 Ma) rekonstruiert werden. Zusätzlich sollen Klimamodelle und biogeochemische Ozeanmodelle eingesetzt werden, um Nährstoff-, Kohlenstoff- und Sauerstoff-Budgets des Kreide-Ozeans unter Berücksichtigung verschiedener orbitaler Konfigurationen besser zu verstehen. Endziel des Projekts ist es, die auslösenden Faktoren, den zeitlichen Ablauf, und biogeochemische Rückkopplungsmechanismen eines rasch anoxisch werdenden Weltozeans zu untersuchen und damit ein Extremszenario der möglichen zukünftigen Entwicklung besser zu verstehen.
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SOCOZA: Dynamics of the Subtropical Convergence Zone off southern Australia| Projektleitung: | Prof. Dr. rer. nat. Dirk Nürnberg, Prof. Dr. rer. nat. Wolfgang Kuhnt, Dr. rer. nat. Ralf Tiedemann, Dr. rer. nat. Joachim Schönfeld | | Förderer: | Deutsche Forschungsgemeinschaft (DFG) | Mitwirkende
Institutionen: |
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| Institut für Geowissenschaften der Universität Kiel | | Stichwörter: | Paleoceanography, micropalaeontology, sedimentology, geochemistry | | Laufzeit: | 17.2.2003 - 16.2.2004 | | Inhalt und Ziele: | The main scientific objective of SOCOZA is to
reconstruct the surface oceanography and the
dynamics of deep water masses during late
Pleistocene glacial/interglacial cycles in the northern
Australian sector of the Southern Ocean. We focus on
the position, extent and strengths of the Subtropical
Convergence Zone and the Leeuwin Current, and
attempt to describe their Late Pleistocene variations in
higher resolution and greater detail than it has been
possible before. Emphasis is likewise given to
Atlantic and Pacific-type carbonate preservation
cycles, the varying influence of different deep water
masses on glacial/interglacial timescales, and the flux
of organic matter to the sea floor as link to surface
ocean production history. We propose four new
IMAGES cores to be collected on a forthcoming
R/VMarion Dufresne cruise to attain the goals of this
project. Two cores to the west of Tasmania and
Tasman Rise shall combine ODP Sites 1168 and 1170
to a north-south transect and will enable to monitor the
variations of the Subtropical Convergence Zone. The
other two cores shall be retrieved to the south of Cape
Pasley in the centre and at the southern limit of todays
Leeuwin Current. They will allow to describe the
dynamics of the warm-water current and glacial
incursions of the Subtropical Convergence into this
area. The sites will cover a depth range from 2500 to
4200 m to ensure that glacial-interglacial carbonate
preservation cycles can be monitored.
| | Kontakt: | Nürnberg, Dirk
Telefon +49 431 600-2313, E-Mail: dnuernberg@geomar.de
| | Publikationen: | - Nürnberg, Dirk ; Brughmans, Natasja ; Schönfeld, Joachim ; Ninnemann, U. ; Dullo, Wolf-Christian:
Paleo-export production, terrigenous flux and sea surface temperatures around Tasmania - implications for glacial/interglacial changes in the subtropical convergence Zone
.
In: Exon, N. ; Kennett, J. ; Malone, M. (Hrsg.) : The cenozoic southern ocean: tectonics, sedimentation and climate change between Australia and Antarctica.
Washington, DC, USA : American Geophysical Union, 2004, (Geophysical Monograph Series Bd. 151), S. 291-318. - ISBN 0-87590-416-5
Stichwörter:
[FB1/POZ]; [FB1/P-OZ]
- Nürnberg, Dirk ; Groeneveld, Jeroen:
Pleistocene variability of the Subtropical Convergence at East Tasman Plateau - Evidence from planktonic foraminiferal Mg/Ca (ODP Site 1172A)
.
In: Geochemistry, Geophysics, Geosystems 7 (2006), Nr. 4, S. Q04P11
Stichwörter:
[FB1/P-OZ]
[doi>10.1029/2005GC000984]
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VITAL: Indonesian Throughflow Variability and Australasian Climate History in the last 150.000 years| Projektleitung: | Prof. Dr. rer. nat. Wolfgang Kuhnt | | Beteiligte: | Dr. Patrick DeDeckker, Dr. Franz Gingele, Dr. Ann Holbourn, Dr. Zhimin Jian, Prof. Dr. rer. nat. Dirk Nürnberg, Dr. Bradley Opdyke, Prof. Dr. Rolf Käse, Prof. Dr. Karl Stattegger | | Förderer: | Bundesministerium für Bildung und Forschung | Mitwirkende
Institutionen: |
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| Institut für Geowissenschaften, Universität Kiel | | IFM-GEOMAR, Kiel | | Institut für Ostseeforschung, Warnemünde | | Tongji Universität, Shanghai, China | | University of Canberra, Australia | | Stichwörter: | Indonesian Throughflow; West Pacific Warm Pool; global thermohaline circulation; sea surface temperatures | | Beginn: | 14.9.2005 | | Inhalt und Ziele: | The impact of the Indonesian Throughflow and West
Pacific Warm Pool on global climate is a key issue to
understand the role of the tropics in global climate
change. Today, the West Pacific Warm Pool plays a key
role in regulating the Earths heat budget. The western
continuation of the West Pacific Warm Pool gives rise to
the Indonesian Throughflow, a narrow band of warm,
low salinity water that transports excess heat and
freshwater from the Pacific to the Indian Ocean through
the Indonesian Gateway.
The Indonesian Throughflow is regarded as one of the
major switchboards in the global thermohaline
circulation, and its variability influences global climate
on short term (ENSOrelated) and longterm timescales.
The heat export from the Pacific into the Indian Ocean
substantially affects atmosphere-ocean coupling in the
tropical Pacific and Indian Ocean and on a global scale.
Changes in Indonesian Throughflow intensity would
not only cause changes in global atmospheric
circulation and affect mid-latitude wind systems, but
would also influence interannual climate anomalies,
such as the ENSO and southeast Asian monsoon
systems.
Main scientific objectives of the project include
- to study hydrographic profiles within the main outflow
path (Timor Strait) of the Indonesian Throughflow,
- to calibrate paleoceanographic proxies to core-top
sediment samples,
- to reconstruct sea-surface temperature, salinity,
nutrients, export production and bottom currents in
sediment cores retrieved along two transects across
Timor Strait,
- to monitor the Indonesian Throughflow variability on
sub-millenial to orbital timescales during the late
Pleistocene, using calibrated paleoceanographic
proxies,
- to test predictions from modeling experiments of a
strongly reduced glacial Indonesian Throughflow and
substantially different hydrographic profiles.
| | Kontakt: | Kuhnt, Wolfgang
Telefon +49 431 880-2938, Fax +49 431 880-4376, E-Mail: wolfgang.kuhnt@ifg.uni-kiel.de
| | Publikationen: | - Zuraida, Rina ; Holbourn, Ann ; Nürnberg, Dirk ; Kuhnt, Wolfgang ; Dürkop, Anke ; Erichsen, A.:
Evidence for Indonesian Throughflow slowdown during Heinrich events 3-5
.
In: Paleoceanography 24 (2009), S. PA2205
Stichwörter:
[FB1/P-OZ]
[doi>10.1029/2008PA001653]
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