Apparent synchroneity of submillennial scale climate events between Greenland and Santa Barbara Basin, California from 30–10ka

Hendy, I. L.; Kennett, James P.; Roark, E. Brendan; Ingram, B. Lynn

doi:10.1016/s0277-3791(01)00138-x

Cited by 175 publications

(155 citation statements)

References 42 publications

Supporting

Mentioning

141

Contrasting

Order By: Relevance

“…Analysis of southern California kelp canopy area and biomass records from 1968 to 2002 reveals predictably higher biomass density during periods of high productivity potential (La Niñ a) versus low productivity potential (El Niñ o; figure 3a), presumably owing to nutrient deficiency during El Niñ o events (Zimmerman & Robertson 1985;Tegner et al 1997). Furthermore, recently published palaeooceanographic records (Hendy et al 2002(Hendy et al , 2004Friddell et al 2003) for the last 20 000 years reveal an abrupt shift in late Quaternary oceanographic productivity potential, from cold unproductive conditions at the LGM to warmer, more productive conditions from 15 600 yr BP to present (figure 3b). The low productivity potential of the LGM may be analogous to long-term El Niñ o conditions (Ortiz et al 2004).…”

Section: Resultsmentioning

confidence: 94%

“…Thus, to estimate late Quaternary changes in giant kelp productivity potential we chose proxies for three environmental variables: sea surface temperature (SST), presence of nutrient-rich sub-photic water (d 15 N) and surface water productivity (%C org ) from the varved sediments of the Santa Barbara Basin, one of the best-known regional records of late Quaternary climate change (Kennett & Ingram 1995). Data from two well-studied sediment cores in the Santa Barbara Channel region, Hole 1017E and Hole JPC76, were used to reconstruct periods of low or high productivity potential since the LGM (SST: Friddell et al 2003;Hendy et al 2004;d 15 N: Hendy et al 2004;%C org : Hendy et al 2002). These proxies provided independent measures of relative changes in temperature, nutrient delivery and productivity, three processes that are highly coupled at daily to decadal scales but may be decoupled at centennial to millenial and longer time scales.…”

Section: Methodsmentioning

confidence: 99%

“…These proxies provided independent measures of relative changes in temperature, nutrient delivery and productivity, three processes that are highly coupled at daily to decadal scales but may be decoupled at centennial to millenial and longer time scales. It should be noted that, owing to incomplete burn-down, the most recent 10 000 yr BP of the %C org record should be considered an upper bound (Hendy et al 2002). To approximate subsequent variation in kelp productivity, we applied (i) the normal-condition canopy biomass-area regression equation to the reconstructed time series of giant kelp forest areas to predict expected kelp forest canopy biomass; and (ii) either the El Niñ o or La Niñ a condition regression equations to predict the lower or upper limits of canopy biomass during the low and high productivity periods, respectively.…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Post-glacial redistribution and shifts in productivity of giant kelp forests

2009

View full text Add to dashboard Cite

Quaternary glacial-interglacial cycles create lasting biogeographic, demographic and genetic effects on ecosystems, yet the ecological effects of ice ages on benthic marine communities are unknown. We analysed long-term datasets to develop a niche-based model of southern Californian giant kelp (Macrocystis pyrifera) forest distribution as a function of oceanography and geomorphology, and synthesized palaeooceanographic records to show that late Quaternary climate change probably drove high millennial variability in the distribution and productivity of this foundation species. Our predictions suggest that kelp forest biomass increased up to threefold from the glacial maximum to the mid-Holocene, then rapidly declined by 40 -70 per cent to present levels. The peak in kelp forest productivity would have coincided with the earliest coastal archaeological sites in the New World. Similar late Quaternary changes in kelp forest distribution and productivity probably occurred in coastal upwelling systems along active continental margins worldwide, which would have resulted in complex shifts in the relative productivity of terrestrial and marine components of coastal ecosystems.

show abstract

Section: Resultsmentioning

confidence: 94%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Post-glacial redistribution and shifts in productivity of giant kelp forests

2009

View full text Add to dashboard Cite

show abstract

“…The chronology of both cores is based on multiple correlations to the established record at ODP Site 893 ( Fig. 2) (14).…”

Section: Resultsmentioning

confidence: 99%

Climatically driven emissions of hydrocarbons from marine sediments during deglaciation

Hill

Kennett²,

Valentine³

et al. 2006

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

View full text Add to dashboard Cite

Marine hydrocarbon seepage emits oil and gas, including methane (Ϸ30 Tg of CH4 per year), to the ocean and atmosphere. Sediments from the California margin contain preserved tar, primarily formed through hydrocarbon weathering at the sea surface. We present a record of variation in the abundance of tar in sediments for the past 32,000 years, providing evidence for increases in hydrocarbon emissions before and during Termination IA [16,000 years ago (16 ka) to 14 ka] and again over Termination IB (11-10 ka). Our study provides direct evidence for increased hydrocarbon seepage associated with deglacial warming through tar abundance in marine sediments, independent of previous geochemical proxies. Climate-sensitive gas hydrates may modulate thermogenic hydrocarbon seepage during deglaciation.methane ͉ paleoclimate ͉ Quaternary climate ͉ hydrate ͉ tar

show abstract

“…In general, warm climate episodes are associated with geographically and vertically expanded OMZs, and cold episodes are associated with contracted OMZs. Climate records from Santa Barbara Basin (SBB), a relatively shallow (600 m) anoxic basin in the eastern boundary current of the northeast Pacific Ocean, exhibit close synchrony to the Greenland Ice Sheet Project 2 (GISP2) Greenland ice core climate records (8,9). Vertical expansion and intensification of the California Current OMZ are recorded during the last deglacial episode, as well as an episode of expanded subsurface oxygenation (OMZ contraction) during the temporary cooling of the Younger Dryas episode (6,8,9).…”

mentioning

confidence: 99%

Response of seafloor ecosystems to abrupt global climate change

Moffitt

Hill

Roopnarine

et al. 2015

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

View full text Add to dashboard Cite

Anthropogenic climate change is predicted to decrease oceanic oxygen (O 2 ) concentrations, with potentially significant effects on marine ecosystems. Geologically recent episodes of abrupt climatic warming provide opportunities to assess the effects of changing oxygenation on marine communities. Thus far, this knowledge has been largely restricted to investigations using Foraminifera, with little being known about ecosystem-scale responses to abrupt, climate-forced deoxygenation. We here present high-resolution records based on the first comprehensive quantitative analysis, to our knowledge, of changes in marine metazoans (Mollusca, Echinodermata, Arthropoda, and Annelida; >5,400 fossils and trace fossils) in response to the global warming associated with the last glacial to interglacial episode. The molluscan archive is dominated by extremophile taxa, including those containing endosymbiotic sulfur-oxidizing bacteria (Lucinoma aequizonatum) and those that graze on filamentous sulfur-oxidizing benthic bacterial mats (Alia permodesta). This record, from 16,100 to 3,400 y ago, demonstrates that seafloor invertebrate communities are subject to major turnover in response to relatively minor inferred changes in oxygenation (>1.5 to <0.5 mL·L −1 [O 2 ]) associated with abrupt (<100 y) warming of the eastern Pacific. The biotic turnover and recovery events within the record expand known rates of marine biological recovery by an order of magnitude, from <100 to >1,000 y, and illustrate the crucial role of climate and oceanographic change in driving long-term successional changes in ocean ecosystems.seafloor ecosystems | abrupt climate change | deglaciation | oxygen minimum zone | metazoans O ceanic deoxygenation is a predictable, fundamental, and long-lasting property of anthropogenic climate change (1). The global ocean inventory of oxygen is predicted to decline between 1% and 7% by the year 2100, and modeling predictions reveal extensive oceanic deoxygenation, on thousand-year timescales, under "business-as-usual" carbon emission scenarios (2). Modern oceanographic time series already document rapid loss of [O 2 ] in interior ocean waters over the last 4 decades (3, 4), although this trend is complicated in regions where [O 2 ] demand is decreased through the slackening of trade winds (5). As oxygen levels in the ocean decrease and the already extensive oxygen minimum zones (OMZs) expand, the volumetric habitat for aerobic respiration is reduced, presumably resulting in a fundamental reorganization of marine communities. Past events of climate warming and OMZ expansion, including the recent deglaciation from 18 to 11 ka, provide a case study for understanding the effects on marine ecosystems of abrupt temperature and oxygenation changes.Paleoceanographic records clearly demonstrate that OMZ strength changed in response to

show abstract

Apparent synchroneity of submillennial scale climate events between Greenland and Santa Barbara Basin, California from 30–10ka

Cited by 175 publications

References 42 publications

Post-glacial redistribution and shifts in productivity of giant kelp forests

Post-glacial redistribution and shifts in productivity of giant kelp forests

Climatically driven emissions of hydrocarbons from marine sediments during deglaciation

Response of seafloor ecosystems to abrupt global climate change

Contact Info

Product

Resources

About