Benthic foraminifera in moderate polluted environment: a case study from Kiel Bight (SW Baltic Sea)| Projektleitung: | Dr. rer. nat. Joachim Schönfeld | | Beteiligte: | Anna Nikulina, M.Sc., Dr. rer. nat. Irina Polovodova, Prof. Dr. rer. nat. Wolf-Christian Dullo, Prof. Dr. rer. nat. Anton Eisenhauer | | Förderer: | DAAD | | Otto Schmidt Labor Program "Dynamics of Northern Eurasian Environments" | Mitwirkende
Institutionen: |
|---|
| Otto Schmidt Labor für Polar- und Meeresforschung, St. Petersburg | | Fakultät für Geographie und Geoökologie, Staatliche Universität St.Petersburg | | Laufzeit: | 1.10.2005 - 30.9.2008 | | Inhalt und Ziele: | The project focuses on the recent and long-term foraminiferal response to
environmental changes due to natural climatic and hydrographic variability
and anthropogenic impact. We have monitored living benthic foraminiferal
assemblages in the Kiel Bight (SW Baltic Sea) in 2005 - 2007 under moderate
pollution from shipyards, harbours and intensive traffic. First results showed
that the dominant environmental forcing of benthic foraminifera is the food
supply in Kiel fjord and the salinity in Flensburg Fjord. A comparison with
previous data from the 1930s and 1960s revealed apparent changes in
species composition and population densities during the past decades. These
changes and a significant increase of test abnormality frequencies indicates
enforced environmental stress. In order to better constrain the reasons,
boundary conditions, and baselines for such alterations in foraminiferal
communities, surface sediment samples and short sediment cores are studied
for tracing the historical environmental changes.
| | Kontakt: | Schönfeld, Joachim
Telefon +49 431 600-2315, E-Mail: jschoenfeld@geomar.de
| | Publikationen: | - Schönfeld, Joachim ; Numberger, Lea:
Seasonal dynamics and decadal changes of benthic foraminiferal assemblages in the western Baltic Sea (NW Europe)
.
In: Journal of Micropalaeontology 26 (2007), S. 47-60
Stichwörter:
[FB1/P-OZ]; Foraminifera; assemblages; phytoplankton; environmental change; Baltic Sea
- Schönfeld, Joachim ; Numberger, Lea:
The benthic foraminiferal response to the 2004 spring bloom in the western Baltic Sea
.
In: Marine Micropaleontology 65 (2007), S. 78-95
Stichwörter:
[FB1/P-OZ]; Baltic Sea; Spring bloom; Benthic foraminifera; Phytopigments; Stable isotopes
[doi>10.1016/j.marmicro.2007.06.003]
|
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: |
|---|
| 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.
|
Foraminiferal shell loss in the Flensburg Fjord (SW Baltic Sea). Living benthic communities under the risk due to acidification?| Projektleitung: | Dr. rer. nat. Joachim Schönfeld | | Beteiligte: | Dr. rer. nat. Irina Polovodova, Prof. Dr. Michael Spindler, (pens.), Prof. Dr. Frank Melzner | | Förderer: | Exzellenzcluster "Ozean der Zukunft" | Mitwirkende
Institutionen: |
|---|
| Universität Kiel, Institut für Polar Ökologie | | Laufzeit: | 1.2.2009 - 30.11.2009 | | Inhalt und Ziele: | This project aims to better constrain the factors influencing carbonate
saturation and foraminiferal shell loss in sediments and to establish the reaction
of the foraminifer Ammonia beccarii to different pCO2 in seawater. For these
purposes seasonal changes in pH, total alkalinity and foraminiferal communities
are to be monitored over the year 2009. Specimens of A. beccarii will be
cultured to determine their growth rates under different pCO2, and to establish
the critical thresholds for calcification, reproduction and growth.
|
Geochemische Charakterisierung von Planktonforaminiferen in der Karibik| Projektleitung: | Dr. rer. nat. Joachim Schönfeld, Prof. Dr. rer. nat. Dirk Nürnberg | | Förderer: | Deutsche Forschungsgemeinschaft | Mitwirkende
Institutionen: |
|---|
| IFM-GEOMAR | | Stichwörter: | Planktische Foraminiferen, Mg/Ca-Temperaturen, stabile Isotope | | Laufzeit: | 1.12.2011 - 30.11.2014 | | Inhalt und Ziele: | Frühere Studien von Mg/Ca Verhältnissen und stabilen Sauerstoffisotopen in
Planktonforaminiferen aus karibischen Oberflächenproben zeigten eine hohe
Datenvariabilität bei Jahresmittel-Temperaturen von über 26°C. Das führte zu
einer substanziellen Unsicherheit bei Rekonstruktionen von
Paläotemperaturen und Salzgehalten mit diesen Proxies. Plankton-Studien
zeigten einen Einfluss der saisonalen Stratifizierung auf die Tiefenverbreitung
flachlebender Arten in der südlichen Karibik. Daraus ergibt sich die Frage, ob
wechselnde Habitate die große Streuung von Mg/Ca und stabilen d18O
Werten bei hohen Temperaturen bewirken können. Um diese Hypothese zu
prüfen, werden wir eine neue geochemische Charakterisierung von
Planktonforaminiferen der Karibik vornehmen. Wir konzentrieren uns auf
oberflächennahe, thermoklinen- und tieflebende Arten, die wir auf der
Meteor-Reise M78/1 mit Pumpproben und Multinetzfängen zusammen
direkten hydrographischen Messungen gesammelt haben. Die
Untersuchungsziele sind Habitat- und Kalzifizierungstiefen einzugrenzen, die
artspezifische Fraktionierung von d18O Werten und
Spurenmetallkonzentrationen zu bestimmen, und den möglichen Einfluss
kryptischer genetischer Diversitäten abzuschätzen. Der Einfluss von
Sekundärkalzit auf die chemische Signatur der Gehäuse soll quantifiziert
werden. Neue Temperaturkalibrierungen sollen mit Isotopen- und
Spurenmetallmessungen an vormals lebenden Exemplaren und Wasserproben
sowie mit ozeanographischen Messungen erstellt werden. Diese
Kalibrierungen werden erheblich präzisere Paläorekonstruktionen von
karibischen Oberflächenwasser-Temperaturen, Salinitäten und
Dichtegradienten erlauben, als es mit bisherigen Eichkurven möglich war, die
auf Jahresmittel-Temperaturen und Messungen an Oberflächensedimenten
beruhen.
| | Kontakt: | Schönfeld, Joachim
Telefon +49 431 600-2315, E-Mail: jschoenfeld@geomar.de
|
HERMES: Hotspot Ecosystem Research on the Margins of European Seas| Projektleitung: | Dr. rer. nat. Olaf Pfannkuche | | Beteiligte: | Prof. Dr. rer. nat. Wolf-Christian Dullo, Dr. rer. nat. Peter Linke, Leiter Technik-und Logistikzentrum, Dr. rer. nat. Joachim Schönfeld, Dr. rer. nat. Andres Rüggeberg | | Förderer: | Europäische Union | Mitwirkende
Institutionen: |
|---|
| National Oceanography Centre Southampton | | Stichwörter: | Meeresbiologie, Paläozeanologie, Meeresgeologie | | Laufzeit: | 1.4.2005 - 31.3.2009 | | Inhalt und Ziele: | HERMES is designed to gain new insights into the biodiversity,
structure, function and dynamics of ecosystems along Europe's
deep-ocean margin to underpin the future development of a
comprehensive European Ocean and Seas Integrated
Governance Policy. It represents the first major attempt to
understand European deep-water ecosystems and their
environment in an integrated way (geosphere, hydrosphere,
biospere and pan-European range), rather than at a specific site or
in one region. HERMES aims to compare and contrast selected
environments around the European margin from Norway to the
Black Sea, which, by virtue of their geographical locations, have
different environmental settings. In particular, HERMES will focus
on hotspots that are strongly physically mediated and associated
with dynamic geological and/or hydrogeological structures, such
as unstable slope systems, canyons, deep-water corals, cold
seeps and anoxic microbial systems. These important systems
require urgent study because of their possible biological fragility,
global relevance to carbon cycling and/or susceptibility to
catastrophic events and to global change. The pressure to improve
understanding of the deep-water ecosystems is great because
man's exploitation of the deep European margin is progressing
rapidly. Hydrocarbons are flowing from deep-sea sediments,
increasing numbers of communication cables are being laid and
traditional fish stocks have declined severely causing increased
bottom trawling to depths as great as 1500 m. To what extent do
these activities interfere with ecosystems, how vulnerable are
ecosystems to man's intrusions and how quickly are they able to
recover? How can we mitigate man's activities and reach a
sustainable balance in accord with international treaties? What is
the likely effect of global change on a ecosystem's ability to
provide 'goods and services' and on our attempts to manage
them? HERMES will address five key questions. Specifically, the
main objectives of HERMES are:
1. To understand better the natural drivers that control ecosystems
2. To understand better the biodiversity and ecosystem function of
hotspot ecosystems
3. To forcast changes in biodiversity and ecosystem functioning
linked to global change
4. To develop concepts and strategies for sustainable use of
marine resources
5. To provide an integrated framework for data management,
education and outreach
|
LOOP: Die Variabilität des LOOP Stromsystems und seine Beziehung zur thermohalinen Zirkulation und zum Mississippi-Ausstrom| Projektleitung: | Prof. Dr. rer. nat. Dirk Nürnberg | | Beteiligte: | Dr. rer. nat. Joachim Schönfeld, Dr. rer. nat. Sascha Flögel, Priv.-Doz. Dr. Carsten Eden, Tiedemann, R., Dr. rer. nat. André Bahr, Dipl.-Geogr. Tanja C. Mildner | | Förderer: | DFG, Schwerpunktprogramm "INTERDYNAMIK" | Mitwirkende
Institutionen: |
|---|
| Alfred-Wegener Institut für Polar und Meeresforschung, Bremerhaven | | Laufzeit: | 1.10.2007 - 31.5.2010 | | Inhalt und Ziele: | Unser Projekt hat zum Ziel, die Dynamik und
Veränderlichkeit des LOOP
Current im Golf von Mexiko (GOM) während der
Interglazialstadien 1 und 5
zu untersuchen. Dazu werden wir die Veränderlichkeit
des Mississippi
Frischwasserausstromes während der Deglaziation
und seine Beziehung zur
thermohalinen Zirkulation im Atlantik abschätzen. Mit
unserem
interdisziplinären Ansatz, der paläozeanographische
Arbeitsweisen mit
numerischen Ozean/Klimamodellen vereinigt, wollen
wir die regionale
Veränderlichkeit in der Ausdehnung des LOOP Current
sowie die zeitliche und
räumliche Veränderlichkeit der Flußzufuhr und der
hydrographischen
Verhältnisse im Golf von Mexiko rekonstruieren. Dabei
werden wir
Übereinstimmungen bzw. Unterschiede zwischen den
regionalen
hydrographischen Ereignissen im Golf und dem
umgebenden
Kontinentalklima sowie der thermohalinen Zirkulation
im Atlantik aufzeigen.
Kernfragen sind, inwieweit ein Frischwassersignal die
Oberflächenhydrographie des Golfes beeinflussen
kann, innerhalb des Golf
bzw. bis in den Atlantik zu verfolgen ist und inwieweit
eine solche
Frischwasseranomalie die großskalige
Ozeanzirkulation beeinflussen kann.
Wir werden moderne
geochemisch-paläozeanographische Methoden (z.B.
Mg/Ca und d18O in Foraminiferen) an verschiedenen
Sedimentkernen
anwenden, die im Einflußbereich des LOOP
Current/Golfstrom-System liegen,
um die oberflächennahe Ozeantemperatur, den
Salzgehalt, Thermoklinen-
und Pycnoklinen-Tiefen und deren Gradienten mit
hoher zeitlicher Auflösung
(> 100 Jahre) zu rekonstruieren. Ein bereits
existierendes "Wirbel-
auflösendes" Modell (FLAME) wird verwendet, um die
Ausdehnung des LOOP
Current und die Veränderlichkeit der Golf-Hydrographie
für verschiedene
klimatische Szenarien sowie
Mississippi-Ausflußvarianten zu modellieren. Die
Modelle sollen dann mit den paläozeanographischen
Rekonstruktionen
abgeglichen werden.
| | Kontakt: | Nürnberg, Dirk
Telefon +49 431 600-2313, E-Mail: dnuernberg@geomar.de
| | Publikationen: | - Nürnberg, Dirk ; Ziegler, M. ; Karas, Cyrus ; Tiedemann, R. ; Schmidt, M.:
Interacting Loop Current variability and Mississippi discharge over the past 400 kyrs
.
Vortrag: European Geosciences Union (EGU) General Assembly 2008,
Wien, 13.4.2008
Stichwörter:
[FB1/P-OZ]
- Nürnberg, Dirk ; Ziegler, Martin ; Karas, Cyrus ; Tiedemann, Ralf ; Schmidt, Matthew:
Interacting loop current variability and Mississippi River discharge over the past 400 kyrs
.
In: Earth and Planetary Science Letters 272 (2008), Nr. 1/2, S. 278-289
Stichwörter:
[FB1/P-OZ]; Loop Current; Gulf of Mexico; Mississippi River discharge; ITCZ; thermohaline circulation; foraminiferal geochemistry
[doi>10.1016/j.epsl.2008.04.051] - Ziegler, Martin ; Nürnberg, Dirk ; Karas, Cyrus ; Tiedemann, Ralf ; Lourens, Lucas J.:
Persistent summer expansion of the Atlantic Warm Pool during glacial abrupt cold events
.
In: Nature Geoscience 1 (2008), Nr. 9, S. 601-605
Stichwörter:
[FB1/P-OZ]
[doi>10.1038/ngeo277] - Bahr, André ; Nürnberg, Dirk ; Schönfeld, Joachim ; Garbe-Schönberg, Dieter:
Hydrological variability in Florida Straits during Marine Isotope Stage 5 cold events
.
In: Paleoceanography 26 (2011),
Stichwörter:
Florida Straits, foraminifereal Mg/Ca, AMOC
[doi>10.1029/2010PA002015] - Kujau, Ariane ; Nürnberg, Dirk ; Zielhofer, Christoph ; Bahr, André ; Röhl, Ursula:
Mississippi River discharge over the last ~560,000 years - Indications from X-ray fluorescence core-scanning
.
In: Palaeogeography, Palaeoclimatology, Palaeoecology 298 (2010), S. 311-318
Stichwörter:
Mississippi discharge, Pleistocene, XRF-scanning
[doi>10.1016/j.palaeo.2010.10.005]
|
Pleistozäne Zwischenwasser und Tiefenwasserzirkulation im SW-Pazifik| Projektleitung: | Prof. Dr. Thiedemann, Ralf, Dr. rer. nat. Sturm, Arne, Prof. Dr. rer. nat. Dirk Nürnberg, Dr. rer. nat. Joachim Schönfeld | | Beteiligte: | Steph, Silke, Nadine Gehre | | Förderer: | DFG | Mitwirkende
Institutionen: |
|---|
| AWI-Bremerhaven | | Stichwörter: | SPP IMAGES | | Laufzeit: | 1.1.2006 - 31.12.2007 | | Inhalt und Ziele: | Summary
We intend to investigate the glacial/interglacial variability of intermediate-
and deep-water circulation in the SW PaciÞc. This study will focus on the role
of glacial deep- and bottom-waters formed in the vicinity of the Ross Sea.
Own previous results from the Australian sector of the Southern Ocean depict
the Ross Sea as a major glacial source for deep-waters that ventilated the
deep PaciÞc. To verify this hypothesis, we propose to take Þve new IMAGES
cores on an intermediate to deep-water transect between 900 and 4,000 m
water depth in the SW PaciÞc sector of the Southern Ocean. The setting
provides an excellent opportunity to assess the causal relationships between
upper-ocean stratiÞcation (temperature, salinity and nutrient gradients) and
changes in intermediate- to deep-water formation, circulation and carbonate
chemistry. These reconstructions will be based on planktonic (shallow- and
deep-dwelling) and benthic Mg/Ca, d18O and d13C records indicative of
changes in temperature, salinity, nutrients and the degree of ventilation.
| | Kontakt: | Nürnberg, Dirk
Telefon +49 431 600-2313, E-Mail: dnuernberg@geomar.de
|
RASTA: Rapid Climate Changes in the Western Tropical Atlantic - Assessment of the biogenous and sedimentary record| Projektleitung: | Prof. Dr. rer. nat. Wolf-Christian Dullo, Prof. Dr. rer. nat. Dirk Nürnberg, Prof. Dr. Gerold Wefer | | Beteiligte: | Dr. rer. nat. Joachim Schönfeld, Dr. rer. nat. Marcus Regenberg | | Förderer: | Bundesministerium für Bildung und Forschung (BMBF) | Mitwirkende
Institutionen: |
|---|
| University Bremen, Geosciences | | University Kiel, Inst. for Geosciences | | Stichwörter: | Paläoklima, Paläoozeanologie | | Laufzeit: | 1.3.2002 - 30.6.2004 | | Inhalt und Ziele: | The Caribbean is an ideal place to study the sensitive
and delicate
Ocean/Climate System and its response to rapid
climate variations
during the last, early Glacial
(Dansgaard/Oeschger-Cycles) as well
as the resulting environmental changes at low
latitudes. The scope
of the project proposed
comprises studies on the interrelated processes of
global climate
variations, sea level changes, sea surface temperature
variations,
deep and intermediate water hydrography, and the
resulting
fluctuations in the assemblage composition of marine
biota in a
confined marginal sea. Emphasis is given to the
paleoceanographical processes during the late
Quaternary, in
particular during the highly dynamic Oxygen Isotope
Stages 2 and
3, and their comparison with the Holocene to recent
situation. Two
largely interrelated sub-projects, and an accompanied
pilot study
contribute to the
achievement of theses goals from different
perspectives with
innovative methods. The basis for the studies is a 37
days
research cruise with R/V Sonne (SO-164, 22nd Mai -
28th
June 2002) to the Caribbean. The marine-geological
expedition
comprises hydroacoustic surveys, sampling of bottom
sediments,
and long piston coring. The deployment of the
submersible JAGO
will allow a detailed mapping of sea bottom structures,
reef
morphology and well-defined sampling at shallow
depth around
the Windward Islands. Hydrocasts, water sampling and
plankton
tows will accomplish the sedimento-logical studies
with ground-
trouth data on the recent oceanography.
The three sub-projects concentrate on the following
topics:
Sub-project 1 (Dullo):
Sea-level variability and carbonate export around the
Lesser
Antilles
Subproject 2 (Wefer, Nürnberg):
Variability of paleo-sea surface temperatures and
variations in
thermocline depths in the Caribbean
Pilot study (Kuhnt, Schönfeld):
Impact of the Gulf-Stream on sedimentary
environments and
benthic communities in the southern Florida Straits
(GOLDFLOS)
| | Kontakt: | Nürnberg, Dirk
Telefon +49 431 600-2313, E-Mail: dnuernberg@geomar.de
| | Publikationen: | - Regenberg, Marcus ; Nürnberg, Dirk ; Steph, Silke ; Groeneveld, Jeroen ; Garbe-Schönberg, C.-Dieter ; Tiedemann, Ralf ; Dullo, Wolf-Christian:
Assessing the effect of dissolution on planktonic foraminiferal Mg/Ca ratios: Evidence from Caribbean core tops
.
In: Geochemistry, Geophysics, Geosystems 7 (2006), Nr. 7, S. Q07P15
Stichwörter:
[FB1/P-OZ]
[doi>10.1029/2005GC001019] - Nürnberg, Dirk ; Schönfeld, Joachim ; Dullo, Wolf-Christian ; Rühlemann, C.:
RASTA Rapid climate changes in the western tropical Atlantic - Assessment of the biogenous and sedimentary record. R/V SONNE cruise report SO164
.
Kiel : GEOMAR Forschungszentrum, 2003
(GEOMAR Report Bd. 109)
Stichwörter:
[FB1/POZ]
- Steph, Silke ; Regenberg, Marcus ; Tiedemann, Ralf ; Mulitza, Stefan ; Nürnberg, Dirk:
Stable isotopes of planktonic foraminifera from tropical Atlantic/Caribbean coretops: implications for reconstructing upper ocean stratification
.
In: Marine Micropaleontology 71 (2009), S. 1-19
Stichwörter:
[FB1/P-OZ]; stable isotopes; planktonic foraminifera; thermocline depth; tropical Atlantic/Caribbean core top samples
[doi>10.1016/j.marmicro.2008.12.004] - Regenberg, Marcus ; Steph, Silke ; Nürnberg, Dirk ; Tiedemann, Ralf ; Garbe-Schönberg, Dieter:
Calibrating Mg/Ca ratios of multiple planktonic foraminiferal species with δ18O-calcification temperatures: paleothermometry for the upper water column
.
In: Earth and Planetary Science Letters 278 (2009), S. 324-336
Stichwörter:
[FB1/P-OZ]; Mg/Ca; stable oxygen isotope; planktonic foraminifera; calcification-temperature calibration; core-top sample; tropical Atlantic
[doi>10.1016/j.epsl.2008.12.019]
|
Short-term changes in sea surface temperature in the Atlantic Warm Water Pool - Gulf of Mexico| Projektleitung: | Prof. Dr. rer. nat. Dirk Nürnberg, Dr. rer. nat. Joachim Schönfeld | | Förderer: | Deutsche Forschungsgemeinschaft (DFG), Schwerpunktprogramm "IMAGES" | Mitwirkende
Institutionen: |
|---|
| Tethys Geoconsulting GmbH | | Stichwörter: | Paläozeanologie, Paläoklimatologie, Meeresgeologie | | Laufzeit: | 29.6.2002 - 30.7.2002 | | Inhalt und Ziele: | Recent work on icecores from Greenland and
Antarctica (e.g., Bender et al., 1994; Blunier et al., 1998)
proved the correlation between short-term climatic
events between the northern and southern
hemisphere. Such interhemispheric teleconnections
are closely linked to rapid changes of the oceanss
thermohaline circulation (e.g., Stocker, 1994). In this
respect, the origin of the 2002000 years lasting warm
events during the glacials (Dansgaard/Oeschger
events) and the role of the Atlantic circulation is not well
understood (Bond et al. 1993, Cortijo et al. 1995;
Fronval et al. 1995; Bond and Lotti, 1995; Rasmussen
et al. 1996). The Carribean and the Gulf of Mexico are at
key positions to document the
paleoceanographic/climatic history of the tropical
Atlantic
and associated changes of cross-equatorial heat
transport to the North Atlantic.
In the framework of the IMAGES VII circum-Pacific
initiative, we propose to take long piston cores in the
DeSoto Canyon at the northern Florida Slope, and in
the central part of the southern Strait of Florida. The
primary objectives are to trace the paleoceanographic
variability within the source area of the Gulf Stream
system and associated changes in northward heat
transport over the last two major glacial/interglacial
cycles. Applied methods include the reconstruc-tion of
sea-surface temperatures (SST) with planktic
foraminiferal assemblages and geochemical proxy
data (e.g., stable isotopes and trace metals in planktic
foraminifers), and the documentation of varying water
mass exchange through the Florida Strait using benthic
foraminiferal
assemblages.
| | Kontakt: | Nürnberg, Dirk
Telefon +49 431 600-2313, E-Mail: dnuernberg@geomar.de
| | Publikationen: | - Nürnberg, Dirk ; Ziegler, M. ; Karas, Cyrus ; Tiedemann, R. ; Schmidt, M.:
Interacting Loop Current variability and Mississippi discharge over the past 400 kyrs
.
Vortrag: European Geosciences Union (EGU) General Assembly 2008,
Wien, 13.4.2008
Stichwörter:
[FB1/P-OZ]
- Ziegler, Martin ; Nürnberg, Dirk ; Karas, Cyrus ; Tiedemann, Ralf ; Lourens, Lucas J.:
Persistent summer expansion of the Atlantic Warm Pool during glacial abrupt cold events
.
In: Nature Geoscience 1 (2008), Nr. 9, S. 601-605
Stichwörter:
[FB1/P-OZ]
[doi>10.1038/ngeo277] - Nürnberg, Dirk ; Ziegler, Martin ; Karas, Cyrus ; Tiedemann, Ralf ; Schmidt, Matthew:
Interacting loop current variability and Mississippi River discharge over the past 400 kyrs
.
In: Earth and Planetary Science Letters 272 (2008), Nr. 1/2, S. 278-289
Stichwörter:
[FB1/P-OZ]; Loop Current; Gulf of Mexico; Mississippi River discharge; ITCZ; thermohaline circulation; foraminiferal geochemistry
[doi>10.1016/j.epsl.2008.04.051]
|
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: |
|---|
| 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]
|
|
|
