Contrasting impacts of Dansgaard–Oeschger events over a western European latitudinal transect modulated by orbital parameters

Goñi, Marı́a Fernanda Sánchez; Landais, A.; Fletcher, William J.; Naughton, Filipa; Desprat, Stéphanie; Duprat, J.

doi:10.1016/j.quascirev.2008.03.003

Cited by 407 publications

(302 citation statements)

References 77 publications

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“…Around a western European latitudinal transect, forests grew in the course of DO events and shrank when Greenland was in the cold phase (23). Since terrestrial vegetation has a reaction time to abrupt climate changes of about 250 y (15), and large forest growth is thought to cause a net uptake of CO 2 from the atmosphere, such an uptake cannot explain a prolonged carbon release to the atmosphere as evidenced in the observed lag of the CDM relative to DO onsets during MIS 3.…”

Section: Discussionmentioning

confidence: 99%

Mode change of millennial CO ₂ variability during the last glacial cycle associated with a bipolar marine carbon seesaw

Bereiter

Lüthi

Siegrist

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

156

188

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Important elements of natural climate variations during the last ice age are abrupt temperature increases over Greenland and related warming and cooling periods over Antarctica. Records from Antarctic ice cores have shown that the global carbon cycle also plays a role in these changes. The available data shows that atmospheric CO 2 follows closely temperatures reconstructed from Antarctic ice cores during these variations. Here, we present new high-resolution CO 2 data from Antarctic ice cores, which cover the period between 115,000 and 38,000 y before present. Our measurements show that also smaller Antarctic warming events have an imprint in CO 2 concentrations. Moreover, they indicate that during Marine Isotope Stage (MIS) 5, the peak of millennial CO 2 variations lags the onset of Dansgaard/Oeschger warmings by 250 AE 190 y. During MIS 3, this lag increases significantly to 870 AE 90 y. Considerations of the ocean circulation suggest that the millennial variability associated with the Atlantic Meridional Overturning Circulation (AMOC) undergoes a mode change from MIS 5 to MIS 4 and 3. Ocean carbon inventory estimates imply that during MIS 3 additional carbon is derived from an extended mass of carbon-enriched Antarctic Bottom Water. The absence of such a carbon-enriched water mass in the North Atlantic during MIS 5 can explain the smaller amount of carbon released to the atmosphere after the Antarctic temperature maximum and, hence, the shorter lag. Our new data provides further constraints for transient coupled carbon cycleclimate simulations during the entire last glacial cycle.abrupt climate change | CO2-temperature phasing | ice age variability | paleoclimate | greenhouse gas T he climate of the last glacial period is characterized by low global mean temperatures and a number of interhemispheric variations on time scales of several millennia. In the northern hemisphere, in particular on the Greenland ice sheet, large and very rapid temperature jumps of up to 15°C within a few decades, followed by more steady decreases of temperature, have been identified from ice core analyses (1, 2). 25 of these so-called Dansgaard-Oeschger (DO) events have been found during the last glacial period. For each of these events, an associated Antarctic temperature variation has been also documented in Antarctic ice cores (Antarctic Isotope Maximum [AIM] events) (3). Antarctic temperatures increase siteadily when Greenland is in the cold phase and slowly decrease following the abrupt temperature increase in Greenland during a DO event. This behavior is explained by the concept of an oceanic thermal bipolar seesaw, where variations in the Atlantic Meridional Overturning Circulation (AMOC) and associated changes in heat transport across the equator to the North Atlantic modulate the southern and northern hemisphere temperatures during each of these events (4).Previous reconstructions of atmospheric CO 2 concentrations during these millennial-scale variations show that CO 2 varies largely in parallel with the major AIM events (...

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Section: Discussionmentioning

confidence: 99%

Mode change of millennial CO ₂ variability during the last glacial cycle associated with a bipolar marine carbon seesaw

Bereiter

Lüthi

Siegrist

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

156

188

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“…The chronostratigraphical framework for cores MD03-2696 (this study) and MD04-2845(Sanchez Goni et al, 2008Daniau et al, submitted for publication) is mainly based on AMS…”

Section: Chronologymentioning

confidence: 99%

Timing of massive ‘Fleuve Manche’ discharges over the last 350kyr: insights into the European ice-sheet oscillations and the European drainage network from MIS 10 to 2

Toucanne

Zaragosi

Bourillet

et al. 2009

Quaternary Science Reviews

188

234

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“…Pollen analysis of marine sediments permits to perform a direct correlation of the terrestrial and marine climatic indicators and to record the vegetation changes against a marine isotopic timescale. Marine pollen sequences from the Iberian margin have already shown their particular ability to detect the millennialscale climatic variability and to delineate the linkage between atmospheric and oceanic changes over the current and previous periods (Desprat et al, , 2006Naughton et al, 2009;Roucoux et al, 2005Roucoux et al, , 2006Sánchez Goñi et al, 1999, 2008Tzedakis et al, 2004b).…”

Section: Introductionmentioning

confidence: 99%

Millennial-scale climatic variability between 340 000 and 270 000 years ago in SW Europe: evidence from a NW Iberian margin pollen sequence

et al. 2009

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Abstract.We present a new high-resolution marine pollen record from NW Iberian margin sediments (core MD03-2697) covering the interval between 340 000 and 270 000 years ago, a time period centred on Marine Isotope Stage (MIS) 9 and characterized by particular baseline climate states. This study enables the documentation of vegetation changes in the north-western Iberian Peninsula and therefore the terrestrial climatic variability at orbital and in particular at millennial scales during MIS 9, directly on a marine stratigraphy. Suborbital vegetation changes in NW Iberia in response to cool/cold events are detected throughout the studied interval even during MIS 9e ice volume minimum. However, they appear more frequent and of higher amplitude during the 30 000 years following the MIS 9e interglacial period and during the MIS 9a-8 transition, which correspond to intervals of an intermediate to high ice volume and mainly periods of ice growth. Each suborbital cold event detected in NW Iberia has a counterpart in the Southern Iberian margin SST record. High to moderate amplitude cold episodes detected on land and in the ocean appear to be related to changes in deep water circulation and probably to iceberg discharges at least during MIS 9d, the mid-MIS 9c cold event and MIS 9b. This work provides therefore additional evidence of pervasive millennial-scale climatic variability in the North Atlantic borderlands throughout past climatic cycles of the Late Pleistocene, regardless of glacial state. However, ice volume might have an indirect influence on the amplitude of the millennial climatic changes in Southern Europe.

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Contrasting impacts of Dansgaard–Oeschger events over a western European latitudinal transect modulated by orbital parameters

Cited by 407 publications

References 77 publications

Mode change of millennial CO ₂ variability during the last glacial cycle associated with a bipolar marine carbon seesaw

Mode change of millennial CO ₂ variability during the last glacial cycle associated with a bipolar marine carbon seesaw

Timing of massive ‘Fleuve Manche’ discharges over the last 350kyr: insights into the European ice-sheet oscillations and the European drainage network from MIS 10 to 2

Millennial-scale climatic variability between 340 000 and 270 000 years ago in SW Europe: evidence from a NW Iberian margin pollen sequence

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Contrasting impacts of Dansgaard–Oeschger events over a western European latitudinal transect modulated by orbital parameters

Cited by 407 publications

References 77 publications

Mode change of millennial CO 2 variability during the last glacial cycle associated with a bipolar marine carbon seesaw

Mode change of millennial CO 2 variability during the last glacial cycle associated with a bipolar marine carbon seesaw

Timing of massive ‘Fleuve Manche’ discharges over the last 350kyr: insights into the European ice-sheet oscillations and the European drainage network from MIS 10 to 2

Millennial-scale climatic variability between 340 000 and 270 000 years ago in SW Europe: evidence from a NW Iberian margin pollen sequence

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Mode change of millennial CO ₂ variability during the last glacial cycle associated with a bipolar marine carbon seesaw

Mode change of millennial CO ₂ variability during the last glacial cycle associated with a bipolar marine carbon seesaw