GLORIA — GEOMAR Library Ocean Research Information Access

1

Digitale Medien

Palaeo-oceanography Deepwater variability in the Holocene epoch (2003)

McManus, Jerry F. ; Cullen, James L. ; Oppo, Delia W.

[s.l.] : Nature Publishing Group

Nature 422 (2003), S. 277-277

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik

Notizen: [Auszug] The conversion of surface water to deep water in the North Atlantic results in the release of heat from the ocean to the atmosphere, which may have amplified millennial-scale climate variability during glacial times and could even have contributed to the past 11,700 years of relatively mild ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/422277b

Permalink

	Standort	Signatur	Einschränkungen	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

2

Digitale Medien

Palaeoclimate A great grand-daddy of ice cores (2004)

McManus, Jerry F.

[s.l.] : Nature Publishing Group

Nature 429 (2004), S. 611-612

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik

Notizen: [Auszug] Millennium after millennium, the snow falling on Greenland and Antarctica has built up deep ice sheets that are invaluable archives of past conditions on Earth. Antarctica has now yielded the longest ice-core record yet, one that covers a staggering 740,000 years, with more to come. This ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/429611a

Permalink

	Standort	Signatur	Einschränkungen	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

3

Unbekannt

100- kyr cyclicity in volcanic ash emplacement: evidence from a 1.1 Myr tephra record from the NW Pacific (2018)

Schindlbeck, Julie Christin ; Jegen, Marion ; Freundt, Armin ; [weitere]

Nature Research

In: Scientific Reports, 8 (Article number 4440).

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2021-03-19

Beschreibung: It is a longstanding observation that the frequency of volcanism periodically changes at times of global climate change. The existence of causal links between volcanism and Earth's climate remains highly controversial, partly because most related studies only cover one glacial cycle. Longer records are available from marine sediment profiles in which the distribution of tephras records frequency changes of explosive arc volcanism with high resolution and time precision. Here we show that tephras of IODP Hole U1437B (northwest Pacific) record a cyclicity of explosive volcanism within the last 1.1 Myr. A spectral analysis of the dataset yields a statistically significant spectral peak at the similar to 100 kyr period, which dominates the global climate cycles since the Middle Pleistocene. A time-domain analysis of the entire eruption and delta O-18 record of benthic foraminifera as climate/sea level proxy shows that volcanism peaks after the glacial maximum and similar to 13 +/- 2 kyr before the delta O-18 minimum right at the glacial/interglacial transition. The correlation is especially good for the last 0.7 Myr. For the period 0.7-1.1 Ma, during the Middle Pleistocene Transition (MPT), the correlation is weaker, since the 100 kyr periodicity in the delta O-18 record diminishes, while the tephra record maintains its strong 100 kyr periodicity.

Materialart: Article , PeerReviewed

Format: text

DOI: 10.1038/s41598-018-22595-0

Permalink

	Standort	Signatur	Einschränkungen	Verfügbarkeit

Andere fanden auch interessant ...

OceanRep: Artikel in einer Fachzeitschrift - begutachtet

PDF

Volltext

4

Unbekannt

The "MIS 11 paradox" and ocean circulation: Role of millennial scale events (2013)

Vázquez Riveiros, Natalia ; Waelbroeck, Claire ; Skinner, Luke ; [weitere]

Elsevier

In: Earth and Planetary Science Letters, 371-372 . pp. 258-268.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2017-03-06

Beschreibung: The role of millennial scale climate variability in supplementing the astronomical forcing of glacial-interglacial transitions remains a major unresolved question. Here we compare the occurrence and character of "terminal" ice rafting events in both the North and South Atlantic during the last deglaciation (Termination I, TI) and during the transition between Marine Isotope Stages (MIS) 12 and 11 (or Termination V. TV). We show that TV experienced a massive terminal ice rafting event in the North Atlantic that was more intense and longer lasting than Heinrich event 1 (H1) of the last deglaciation. This massive ice rafting event was linked to cold stadial conditions and reduced deep water formation in the North Atlantic, in parallel with warming at high southern latitudes, similar to the bipolar seesaw pattern exhibited during H1 over the last deglaciation. We propose that the particular intensity and duration of the TV ice rafting event resulted from the especially large volume of Northern Hemisphere ice sheets during MIS12. In turn, the unusually long duration and large amplitude of TV likely resulted from the exceptionally prolonged collapse of the AMOC during the TV Heinrich stadia], and from a subsequent transient AMOC "overshoot" with respect to later MIS11 interglacial circulation. Furthermore, we suggest that the intense Heinrich stadial of TV contributed to the deglaciation primarily via meridional heat transport anomalies that would have enhanced the incipient warming arising from relatively weak insolation forcing, and only secondarily via CO2 release

Materialart: Article , PeerReviewed

Format: text

DOI: 10.1016/j.epsl.2013.03.036

Permalink

	Standort	Signatur	Einschränkungen	Verfügbarkeit

Andere fanden auch interessant ...

OceanRep: Artikel in einer Fachzeitschrift - begutachtet

PDF

Volltext

5

Unbekannt

The “MIS 11 paradox” and ocean circulation: Role of millennial scale events (2013)

Vazquez Riveiros, Natalia ; Waelbroeck, Claire ; Skinner, Luke ; [weitere]

Elsevier

In: Earth and Planetary Science Letters, 371-372 . pp. 258-268.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2016-10-26

Beschreibung: Highlights • North Atlantic records indicate an intense Heinrich stadial (HS) during Termination V. • The HS probably resulted from extreme glacial conditions during MIS12. • The HS curtailed AMOC, shaping TV via meridional heat transport anomalies. • The rate of CO2 release during the HS of TV was lower than during HS1. • North Atlantic overturning during MIS11 was enhanced with respect to the Holocene. Abstract The role of millennial scale climate variability in supplementing the astronomical forcing of glacial–interglacial transitions remains a major unresolved question. Here we compare the occurrence and character of “terminal” ice rafting events in both the North and South Atlantic during the last deglaciation (Termination I, TI) and during the transition between Marine Isotope Stages (MIS) 12 and 11 (or Termination V, TV). We show that TV experienced a massive terminal ice rafting event in the North Atlantic that was more intense and longer lasting than Heinrich event 1 (H1) of the last deglaciation. This massive ice rafting event was linked to cold stadial conditions and reduced deep water formation in the North Atlantic, in parallel with warming at high southern latitudes, similar to the bipolar seesaw pattern exhibited during H1 over the last deglaciation. We propose that the particular intensity and duration of the TV ice rafting event resulted from the especially large volume of Northern Hemisphere ice sheets during MIS12. In turn, the unusually long duration and large amplitude of TV likely resulted from the exceptionally prolonged collapse of the AMOC during the TV Heinrich stadial, and from a subsequent transient AMOC “overshoot” with respect to later MIS11 interglacial circulation. Furthermore, we suggest that the intense Heinrich stadial of TV contributed to the deglaciation primarily via meridional heat transport anomalies that would have enhanced the incipient warming arising from relatively weak insolation forcing, and only secondarily via CO2 release.

Materialart: Article , PeerReviewed

Format: text

DOI: 10.1016/j.epsl.2013.03.036

Permalink

	Standort	Signatur	Einschränkungen	Verfügbarkeit

Andere fanden auch interessant ...

OceanRep: Artikel in einer Fachzeitschrift - begutachtet

PDF

Volltext

6

Unbekannt

The biogeochemical impact of glacial meltwater from Southwest Greenland (2019)

Hendry, Katharine R. ; Huvenne, Veerle A.I. ; Robinson, Laura F. ; [weitere]

Elsevier

In: Progress in Oceanography, 176 . Art.Nr. 102126.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2022-01-31

Beschreibung: Highlights • Novel multi-disciplinary approach to tracing freshwater and particle transport into boundary currents; • Significant glacial inputs reach coastal waters and are transported rapidly offshore; • Low surface water dissolved silicon concentrations maintained by diatom activity despite strong glacial and benthic supplies. Abstract Biogeochemical cycling in high-latitude regions has a disproportionate impact on global nutrient budgets. Here, we introduce a holistic, multi-disciplinary framework for elucidating the influence of glacial meltwaters, shelf currents, and biological production on biogeochemical cycling in high-latitude continental margins, with a focus on the silica cycle. Our findings highlight the impact of significant glacial discharge on nutrient supply to shelf and slope waters, as well as surface and benthic production in these regions, over a range of timescales from days to thousands of years. Whilst biological uptake in fjords and strong diatom activity in coastal waters maintains low dissolved silicon concentrations in surface waters, we find important but spatially heterogeneous additions of particulates into the system, which are transported rapidly away from the shore. We expect the glacially-derived particles – together with biogenic silica tests – to be cycled rapidly through shallow sediments, resulting in a strong benthic flux of dissolved silicon. Entrainment of this benthic silicon into boundary currents may supply an important source of this key nutrient into the Labrador Sea, and is also likely to recirculate back into the deep fjords inshore. This study illustrates how geochemical and oceanographic analyses can be used together to probe further into modern nutrient cycling in this region, as well as the palaeoclimatological approaches to investigating changes in glacial meltwater discharge through time, especially during periods of rapid climatic change in the Late Quaternary.

Materialart: Article , PeerReviewed

Format: text

DOI: 10.1016/j.pocean.2019.102126

Permalink

	Standort	Signatur	Einschränkungen	Verfügbarkeit

Andere fanden auch interessant ...

OceanRep: Artikel in einer Fachzeitschrift - begutachtet

PDF

Volltext

7

Unbekannt

Strengthening of the Northeast Monsoon over the Flores Sea, Indonesia, at the time of Heinrich event 1 (2012)

Muller, Joanne ; McManus, Jerry F. ; Oppo, Delia W. ; Francois, Roger

Geological Society of America (GSA)

In: Geology 40: 635-638.

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2012-07-01

Beschreibung: Paleoclimate evidence from South America and Asia has been interpreted to indicate that tropical rainfall migrated southward during the Northern Hemisphere cooling associated with Heinrich stadial 1 (HS1), an event of massive iceberg discharge to the North Atlantic ca. 18–15 ka. Although arid conditions associated with such a shift are well documented in southern Asia, as far south as Borneo, debate still exists regarding the precipitation response in southern Indonesia and Australia during HS1. This study utilizes concentrations of the long-lived nuclide 232Th as a proxy for detrital riverine input and 230Th normalization to estimate the history of preserved fluxes reaching the seafloor in the Flores Sea, located between southern Sulawesi and the Lesser Sunda Islands, Indonesia. Because the only source of 232Th to the ocean is continental minerals, this proxy is a robust indicator of continental weathering. The 230Th normalized burial fluxes of lithogenic and biogenic matter demonstrate that both detrital and biogenic fluxes in the Flores Sea were higher during HS1 than any other period in the past 22 k.y. High detrital fluxes indicate enhanced precipitation runoff from surrounding landmasses during a period of maximum southward shift of the Intertropical Convergence Zone. This study further constrains the northern limit of enhanced rainfall associated with a southward shift of Australian monsoon-related rainfall at the time of HS1 and highlights the value of 232Th as a proxy of continental input to deep-sea sediment records.

Print ISSN: 0091-7613

Digitale ISSN: 1943-2682

Thema: Geologie und Paläontologie

Publiziert von Geological Society of America (GSA)

Permalink

	Standort	Signatur	Einschränkungen	Verfügbarkeit

Andere fanden auch interessant ...

PAPER CURRENT

Volltext

8

Unbekannt

Sample masses and lithic fraction of IODP Site 306-U1313 (2010)

Voelker, Antje H L ; Rodrigues, Teresa ; Billups, Katharina ; [weitere]

PANGAEA

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2024-03-02

Schlagwort(e): 306-U1313; AGE; COMPCORE; Composite Core; Counting 〉315 µm fraction; Depth, composite revised; DEPTH, sediment/rock; Dry mass; DSDP/ODP/IODP sample designation; Exp306; Ice rafted debris; Integrated Ocean Drilling Program / International Ocean Discovery Program; Intercore correlation; IODP; Joides Resolution; North Atlantic Climate 2; Sample code/label; Weighted

Materialart: Dataset

Format: text/tab-separated-values, 3220 data points

Permalink

	Standort	Signatur	Einschränkungen	Verfügbarkeit

Andere fanden auch interessant ...

DATA PANGAEA

Volltext

9

Unbekannt

Beam attenuation coefficient data from Knipovich seamount station JC094-STN020 of the James Cook cruise JC094 (2021)

Ng, Hong Chin ; Robinson, Laura F ; Rowland, George Henry ; [weitere]

PANGAEA

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2024-03-02

Beschreibung: The radiogenic isotope ratio 231Pa/230Th of seawater and ocean sediments is a potentially powerful tool for tracing oceanic processes such as the ocean circulation and marine primary productivity. However, 231Pa/230Th reflects the combined signal of multiple controls associated with scavenging and oceanic transport, limiting its use as a paleo-proxy. Given that links between seawater and sedimentary 231Pa and 230Th distributions are crucial for understanding the cycling and removal fluxes of these nuclides, we carry out analysis of 231Pa and 230Th in both seawater (dissolved phase) and modern sediment samples acquired from five depth transects across the northern tropical Atlantic open ocean during the JC094 research expedition which took place in October-November 2013. Measurements of the radiogenic isotopes were performed using a MultiCollector-Inductively Coupled Plasma-Mass Spectrometer (MC-ICP-MS). In addition, CTD beam attenuation coefficient measurements and XRF scan Fe and Ti measurements of two sediment cores collected from the region during the same research expedition are presented to aid interpretation of 231Pa and 230Th data. Here we show the CTD beam attenuation coefficient data near the Knipovich Seamount.

Schlagwort(e): beam attenuation coefficient; CTD; DEPTH, water; Event label; James Cook; JC094; JC094-STN020; Latitude of event; Longitude of event; Optical beam attenuation coefficient, particle in water column; Pa/Th; tropical Atlantic; TROPICS; XRF

Materialart: Dataset

Format: text/tab-separated-values, 4047 data points

Permalink

	Standort	Signatur	Einschränkungen	Verfügbarkeit

Andere fanden auch interessant ...

DATA PANGAEA

Volltext

10

Unbekannt

Beam attenuation coefficient data from Vema ridge stations JC094-STN032 and JCO94-STN039 of the James Cook cruise JC094 (2021)

Ng, Hong Chin ; Robinson, Laura F ; Rowland, George Henry ; [weitere]

PANGAEA

zur Merkliste hinzufügen auf der Merkliste

Details

Publikationsdatum: 2024-03-02

Beschreibung: The radiogenic isotope ratio 231Pa/230Th of seawater and ocean sediments is a potentially powerful tool for tracing oceanic processes such as the ocean circulation and marine primary productivity. However, 231Pa/230Th reflects the combined signal of multiple controls associated with scavenging and oceanic transport, limiting its use as a paleo-proxy. Given that links between seawater and sedimentary 231Pa and 230Th distributions are crucial for understanding the cycling and removal fluxes of these nuclides, we carry out analysis of 231Pa and 230Th in both seawater (dissolved phase) and modern sediment samples acquired from five depth transects across the northern tropical Atlantic open ocean during the JC094 research expedition which took place in October-November 2013. Measurements of the radiogenic isotopes were performed using a MultiCollector-Inductively Coupled Plasma-Mass Spectrometer (MC-ICP-MS). In addition, CTD beam attenuation coefficient measurements and XRF scan Fe and Ti measurements of two sediment cores collected from the region during the same research expedition are presented to aid interpretation of 231Pa and 230Th data. Here we show the CTD beam attenuation coefficient data near the Vema Fracture Zone.

Schlagwort(e): beam attenuation coefficient; CTD; DEPTH, water; Event label; James Cook; JC094; JC094-STN032; JC094-STN039; Latitude of event; Longitude of event; Optical beam attenuation coefficient, particle in water column; Pa/Th; tropical Atlantic; TROPICS; XRF

Materialart: Dataset

Format: text/tab-separated-values, 10069 data points

Permalink

	Standort	Signatur	Einschränkungen	Verfügbarkeit

Andere fanden auch interessant ...

DATA PANGAEA

Volltext