Dansgaard‐Oeschger Cycles and the California Current System: Planktonic foraminiferal response to rapid climate change in Santa Barbara Basin, Ocean Drilling Program Hole 893A

Hendy, I. L.; Kennett, James P.

doi:10.1029/1999pa000413

Cited by 150 publications

(119 citation statements)

References 47 publications

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“…Other SST estimates of both winter and summer change for D-O 8 are summarised by Harrison and Sanchez-Goñi (2010) and show SST increases of 8-10 • C in both seasons for sites at latitude 37-45 • N in the Atlantic. These changes are consistent with the modelled change in summer, but the winter temperature change is larger in the model, which is in places larger than 15 • C. The model fails to reproduce the 3-5 • C warming over the Santa Barbara Basin inferred by Hendy and Kennett (2000). The majority of these changes appear to be replicated to some extent in the model simulations.…”

Section: Comparison Of Climate Anomalies With Reconstructionssupporting

confidence: 71%

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Limited response of peatland CH<sub>4</sub> emissions to abrupt Atlantic Ocean circulation changes in glacial climates

Hopcroft

Valdes

Wania³

et al. 2014

Clim. Past

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Abstract. Ice-core records show that abrupt DansgaardOeschger (D-O) climatic warming events of the last glacial period were accompanied by large increases in the atmospheric CH 4 concentration (up to 200 ppbv). These abrupt changes are generally regarded as arising from the effects of changes in the Atlantic Ocean meridional overturning circulation and the resultant climatic impact on natural CH 4 sources, in particular wetlands. We use two different ecosystem models of wetland CH 4 emissions to simulate northern CH 4 sources forced with coupled general circulation model simulations of five different time periods during the last glacial to investigate the potential influence of abrupt ocean circulation changes on atmospheric CH 4 levels during D-O events. The simulated warming over Greenland of 7-9 • C in the different time periods is at the lower end of the range of 11-15 • C derived from ice cores, but is associated with strong impacts on the hydrological cycle, especially over the North Atlantic and Europe during winter. We find that although the sensitivity of CH 4 emissions to the imposed climate varies significantly between the two ecosystem emissions models, the model simulations do not reproduce sufficient emission changes to satisfy ice-core observations of CH 4 increases during abrupt events. The inclusion of permafrost physics and peatland carbon cycling in one model (LPJ-WHyMe) increases the climatic sensitivity of CH 4 emissions relative to the Sheffield Dynamic Global Vegetation Model (SDGVM) model, which does not incorporate these processes. For equilibrium conditions this additional sensitivity is mostly due to differences in carbon cycle processes, whilst the increased sensitivity to the imposed abrupt warmings is also partly due to the effects of freezing on soil thermodynamics. These results suggest that alternative scenarios of climatic change could be required to explain the abrupt glacial CH 4 variations, perhaps with a more dominant role for tropical wetland CH 4 sources.

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Section: Comparison Of Climate Anomalies With Reconstructionssupporting

confidence: 71%

“…NGRIP Project Members, 2004;Wolff et al, 2010) and from an increasing number of palaeoclimate proxies from across the globe (e.g. Peterson et al, 2000;Hendy and Kennett, 2000;Wang et al, 2001;Kanner et al, 2012). D-O events typically constitute abrupt warmings of 8 to 16 • C in Greenland which take place over 10-40 yr (e.g.…”

Section: Introductionmentioning

confidence: 99%

Limited response of peatland CH<sub>4</sub> emissions to abrupt Atlantic Ocean circulation changes in glacial climates

Hopcroft

Valdes

Wania³

et al. 2014

Clim. Past

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“…Most of these studies revealed a strong link between oxygen deficit in the northern Pacific and Northern Hemisphere high latitude climate on millennial timescales, with enhanced oxygen depletion and higher biological productivity during warm Dansgaard-Oeschger (DO) interstadial events, and enhanced oxygenation during Heinrich events (HE). Both biological productivity and oceanic ventilation are suspected to have influenced past OMZ variations (Hendy and Kennett, 2000;Hendy et al, 2004;Cartapanis et al, 2011Cartapanis et al, , 2012. In particular, modelling studies indicate that the disruption of North Atlantic Deep Water formation during HE was associated with an increase of the oxygenation in the northern Pacific.…”

Section: O Cartapanis Et Al: Pacific Oxygen Minimum Zone Under Intementioning

confidence: 99%

Persistent millennial-scale link between Greenland climate and northern Pacific Oxygen Minimum Zone under interglacial conditions

Cartapanis

Tachikawa²,

Romero³

et al. 2014

Clim. Past

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Abstract. The intensity and/or extent of the northeastern Pacific Oxygen Minimum Zone (OMZ) varied in-phase with the Northern Hemisphere high latitude climate on millennial timescales during the last glacial period, indicating the occurrence of atmospheric and oceanic connections under glacial conditions. While millennial variability was reported for both the Greenland and the northern Atlantic Ocean during the last interglacial period, the climatic connections with the northeastern Pacific OMZ has not yet been observed under warm interglacial conditions. Here we present a new geochemical dataset, spanning the past 120 ka, for major components (terrigenous fraction, marine organic matter, biogenic opal, and carbonates) generated by X-ray fluorescence scanning alongside with biological productivity and redox sensitive trace element content (Mo, Ni, Cd) of sediment core MD02-2508 at 23 • N, retrieved from the northern limit of the modern OMZ. Based on elemental ratios Si / Ti (proxy for opal), Cd / Al and Ni / Al, we suggest that biological productivity was high during the last interglacial (MIS5). Highly resolved opal reconstruction presents millennial variability corresponding to all the Dansgaard-Oeschger interstadial events over the last interglacial, while the Mo / Al ratio indicates reduced oxygenation during these events. Extremely high opal content during warm interstadials suggests high diatom productivity. Despite the different climatic and oceanic background between glacial and interglacial periods, rapid variability in the northeastern Pacific OMZ seems to be tightly related to Northern Hemisphere high latitude climate via atmospheric and possibly oceanic processes.

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“…Together with studies from the NE Pacific (e.g. Hendy and Kennett, 2000) they imply that short episodes of increased marine productivity are connected with interstadials recorded in Greenland ice cores. However, the existing reconstructions within the N Pacific realm are constrained by the shallow lysocline, which limits the use of carbonate-based proxies and causes stratigraphic uncertainties.…”

Section: Introductionmentioning

confidence: 99%

Millennial-scale variability of marine productivity and terrigenous matter supply in the western Bering Sea over the past 180 kyr

et al. 2013

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We used piston cores recovered in the western Bering Sea to reconstruct millennial-scale changes in marine productivity and terrigenous matter supply over the past ~180 kyr. Based on a geochemical multi-proxy approach, our results indicate closely interacting processes controlling marine productivity and terrigenous matter supply comparable to the situation in the Okhotsk Sea. Overall, terrigenous inputs were high, whereas export production was low. Minor increases in marine productivity occurred during intervals of Marine Isotope Stage 5 and interstadials, but pronounced maxima were recorded during interglacials and Termination I. The terrigenous material is suggested to be derived from continental sources on the eastern Bering Sea shelf and to be subsequently transported via sea ice, which is likely to drive changes in surface productivity, terrigenous inputs, and upper-ocean stratification. From our results we propose glacial, deglacial, and interglacial scenarios for environmental change in the Bering Sea. These changes seem to be primarily controlled by insolation and sea-level forcing which affect the strength of atmospheric pressure systems and sea-ice growth. The opening history of the Bering Strait is considered to have had an additional impact. High-resolution core logging data (color b*, XRF scans) strongly correspond to the Dansgaard–Oeschger climate variability registered in the NGRIP ice core and support an atmospheric coupling mechanism of Northern Hemisphere climates

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Dansgaard‐Oeschger Cycles and the California Current System: Planktonic foraminiferal response to rapid climate change in Santa Barbara Basin, Ocean Drilling Program Hole 893A

Cited by 150 publications

References 47 publications

Limited response of peatland CH<sub>4</sub> emissions to abrupt Atlantic Ocean circulation changes in glacial climates

Limited response of peatland CH<sub>4</sub> emissions to abrupt Atlantic Ocean circulation changes in glacial climates

Persistent millennial-scale link between Greenland climate and northern Pacific Oxygen Minimum Zone under interglacial conditions

Millennial-scale variability of marine productivity and terrigenous matter supply in the western Bering Sea over the past 180 kyr

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Dansgaard‐Oeschger Cycles and the California Current System: Planktonic foraminiferal response to rapid climate change in Santa Barbara Basin, Ocean Drilling Program Hole 893A

Cited by 150 publications

References 47 publications

Limited response of peatland CH&lt;sub&gt;4&lt;/sub&gt; emissions to abrupt Atlantic Ocean circulation changes in glacial climates

Limited response of peatland CH&lt;sub&gt;4&lt;/sub&gt; emissions to abrupt Atlantic Ocean circulation changes in glacial climates

Persistent millennial-scale link between Greenland climate and northern Pacific Oxygen Minimum Zone under interglacial conditions

Millennial-scale variability of marine productivity and terrigenous matter supply in the western Bering Sea over the past 180 kyr

Contact Info

Product

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Limited response of peatland CH<sub>4</sub> emissions to abrupt Atlantic Ocean circulation changes in glacial climates

Limited response of peatland CH<sub>4</sub> emissions to abrupt Atlantic Ocean circulation changes in glacial climates