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| De La Fuente, Maria; Calvo, Eva; Skinner, Luke; Pelejero, Carles; Evans, David; Mueller, Wolfgang; Povea, Patricia; Cacho, Isabel. |
| It has been shown that the deep Eastern Equatorial Pacific (EEP) region was poorly ventilated during the Last Glacial Maximum (LGM) relative to Holocene values. This finding suggests a more efficient biological pump, which indirectly supports the idea of increased carbon storage in the deep ocean contributing to lower atmospheric CO2 during the last glacial. However, proxies related to respired carbon are needed in order to directly test this proposition. Here we present Cibicides wuellerstorfi B/Ca ratios from Ocean Drilling Program Site 1240 measured by laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) as a proxy for deep water carbonate saturation state ([CO32-], and therefore [CO32-]), along with C-13 measurements. In addition, the... |
| Tipo: Text |
Palavras-chave: Marine carbon cycle; Carbonate chemistry; Ocean circulation; Glacial-interglacial cycles; Soft-tissue pump efficiency; Seafloor calcite dissolution. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00497/60824/64598.pdf |
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| Cacho, Isabel; Grimalt, Joan O.; Pelejero, Carles; Canals, Miquel; Sierro, Francisco; Flores, Jose Abel; Shackleton, Nicholas J.. |
| Past sea surface temperature (SST) evolution in the Alboran Sea (western Mediterranean) during the last 50,000 years has been inferred from the study of C-37 alkenones in International Marine Global Change Studies MD952043 core. This record has a time resolution of similar to 200 years allowing the study of millennial-scale and even shorter climatic changes. The observed SST curve displays characteristic sequences of extremely rapid warming and cooling events along the glacial period. Comparison of this Alboran record with delta(18)O from Greenland ice (Greenland Ice Sheet Project 2 core) shows a strong parallelism between these SST oscillations and the Dansgaard-Oeschger events. Five prominent cooling episodes standing out in the SST profile are... |
| Tipo: Text |
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| Ano: 1999 |
URL: https://archimer.ifremer.fr/doc/00239/35044/36810.pdf |
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| Tilbrook, Bronte; Jewett, Elizabeth B.; Degrandpre, Michael D.; Martin Hernandez-ayon, Jose; Feely, Richard A.; Gledhill, Dwight K.; Hansson, Lina; Isensee, Kirsten; Kurz, Meredith L.; Newton, Janet A.; Siedlecki, Samantha A.; Chai, Fei; Dupont, Sam; Graco, Michelle; Calvo, Eva; Greeley, Dana; Kapsenberg, Lydia; Lebrec, Marine; Pelejero, Carles; Schoo, Katherina L.; Telszewski, Maciej. |
| A successful integrated ocean acidification (OA) observing network must include (1) scientists and technicians from a range of disciplines from physics to chemistry to biology to technology development; (2) government, private, and intergovernmental support; (3) regional cohorts working together on regionally specific issues; (4) publicly accessible data from the open ocean to coastal to estuarine systems; (5) close integration with other networks focusing on related measurements or issues including the social and economic consequences of OA; and (6) observation-based informational products useful for decision making such as management of fisheries and aquaculture. The Global Ocean Acidification Observing Network (GOA-ON), a key player in this vision,... |
| Tipo: Text |
Palavras-chave: Global Ocean Acidification Observing Network; Sustainable Development Goal; Ocean acidification; Ecosystem stressors; Capacity building. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00675/78727/80987.pdf |
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| Barrows, Timothy T.; Juggins, Steve; De Deckker, Patrick; Calvo, Eva; Pelejero, Carles. |
| We compile and compare data for the last 150,000 years from four deep-sea cores in the midlatitude zone of the Southern Hemisphere. We recalculate sea surface temperature estimates derived from foraminifera and compare these with estimates derived from alkenones and magnesium/calcium ratios in foraminiferal carbonate and with accompanying sedimentological and pollen records on a common absolute timescale. Using a stack of the highest-resolution records, we find that first-order climate change occurs in concert with changes in insolation in the Northern Hemisphere. Glacier extent and inferred vegetation changes in Australia and New Zealand vary in tandem with sea surface temperatures, signifying close links between oceanic and terrestrial temperature. In... |
| Tipo: Text |
Palavras-chave: Sea surface temperature; Climate change; Australia–New Zealand. |
| Ano: 2007 |
URL: https://archimer.ifremer.fr/doc/00238/34941/33245.pdf |
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| De La Fuente, Maria; Skinner, Luke; Calvo, Eva; Pelejero, Carles; Cacho, Isabel. |
| Consistent evidence for a poorly ventilated deep Pacific Ocean that could have released its radiocarbon-depleted carbon stock to the atmosphere during the last deglaciation has long been sought. Such evidence remains lacking, in part due to a paucity of surface reservoir age reconstructions required for accurate deep-ocean ventilation age estimates. Here we combine new radiocarbon data from the Eastern Equatorial Pacific (EEP) with chronostratigraphic calendar age constraints to estimate shallow sub-surface reservoir age variability, and thus provide estimates of deep-ocean ventilation ages. Both shallow- and deep-water ventilation ages drop across the last deglaciation, consistent with similar reconstructions from the South Pacific and Southern Ocean. The... |
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| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00351/46257/46070.pdf |
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| Calvo, Eva; Pelejero, Carles; De Deckker, Patrick; Logan, Graham A.. |
| Comparison of ice cores from Greenland and Antarctica shows an asynchronous two-step warming at these high latitudes during the Last Termination. However, the question whether this asynchrony extends to lower latitudes is unclear mainly due to the scarcity of paleorecords from the Southern Hemisphere. New data from a marine core collected off South Australia (similar to 36 degrees S) allows a detailed reconstruction of sea-surface temperatures over the Last Termination. This confirms the existence of an Antarctic-type deglacial pattern and shows no indication of cooling associated with the Northern Hemisphere YD event. The SST record also provides a new comparison with the more extensive paleoclimatic data available from continental Australia. This shows a... |
| Tipo: Text |
Palavras-chave: Alkenones; Deglaciation; Southern Hemisphere. |
| Ano: 2007 |
URL: https://archimer.ifremer.fr/doc/00235/34647/33013.pdf |
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