Depth and seasonality of alkenone production along the California Margin inferred from a core top transect

Herbert, Timothy D; Schuffert, Jeffrey D; Thomas, Deborah J; Lange, Carina B.; Weinheimer, Amy L.; Peleo-Alampay, A.; Herguera, Juan Carlos

doi:10.1029/98pa00069

Cited by 97 publications

(72 citation statements)

References 40 publications

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“…Alkenones appear to be resistant to food web processes [e.g., Rowland and Volkman, 1982], sedimentary degradation during diagenesis [Prahl et al, 2003], and even exposure to air for long periods (T. Eglinton, personal communication, 2005). It has also been shown that the unsaturation ratio of C 37 alkenones does not appear to be affected by changes in community structure of haptophyte algae during the Late Quaternary [Herbert et al, 1998]. The C 37:4 alkenone is absent in our sediments since it is mainly produced by organisms that dwell in the colder waters of higher latitudes.…”

Section: Sea Surface Temperature Estimatesmentioning

confidence: 84%

A 28‐ka history of sea surface temperature, primary productivity and planktonic community variability in the western Arabian Sea

et al. 2007

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[1] Uranium series radionuclides and organic biomarkers, which represent major groups of planktonic organisms, were measured in western Arabian Sea sediments that span the past 28 ka. Variability in the past strength of the southwest and northeast monsoons and its influence on primary productivity, sea surface temperature (SST), and planktonic community structure were investigated. The average alkenone-derived SST for the last glacial period was $3°C lower than that measured for the Holocene. Prior to the deglacial, the lowest SSTs coincide with the highest measured fluxes of organic biomarkers, which represent primarily a planktonic suite of diatoms, coccolithophorids, dinoflagellates, and zooplankton. We propose that intensification of winter northeast monsoon winds during the last glacial period resulted in deep convective mixing, cold SSTs and enhanced primary productivity. In contrast, postdeglacial (<17 ka) SSTs are warmer during times in which biomarker fluxes are high. Associated with this transition is a planktonic community structure change, in which the ratio of the average cumulative flux of diatom biomarkers to the cumulative flux of coccolithophorid biomarkers is twice as high during the deglacial and Holocene than the average ratio during the last glacial period. We suggest that this temporal transition represents a shift from a winter northeast monsoon-dominated (pre-17 ka) to a summer southwest monsoon-dominated (post-17 ka) wind system. Citation: Pourmand, A., F. Marcantonio, T. S. Bianchi, E. A. Canuel, and E. J. Waterson (2007), A 28-ka history of sea surface temperature, primary productivity and planktonic community variability in the western Arabian Sea, Paleoceanography, 22, PA4208,

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Section: Sea Surface Temperature Estimatesmentioning

confidence: 84%

A 28‐ka history of sea surface temperature, primary productivity and planktonic community variability in the western Arabian Sea

et al. 2007

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“…They are produced by the coccolithophorid Haptophyte algae (Volkman et al, 1980;Marlowe et al, 1984;Conte and Eglinton, 1994;Green and Leadbeater, 1994) and their unsaturation degree is mainly controlled by their growth temperature in the water column. Culture and field experiments indicate that the unsaturation degree of C 37 alkenones, U 37 K′ index ( U 37 K′ = [C 37:2 ]/[C 37:3 + C 37:2 ]; Prahl and Wakeham, 1987) is related to sea surface temperature (Prahl and Wakeham, 1987;Prahl et al, 1988;Müller et al, 1998;Herbert et al, 1998). This ratio is generally unaltered through the food web in water column and early diagenesis in sediments (Prahl and Muehlausen, 1989).…”

Section: Introductionmentioning

confidence: 99%

Alkenone sea surface temperature in the Okhotsk Sea for the last 15 kyr.

et al. 2000

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A sediment core collected from the Sea of Okhotsk, a marginal sea of the western North Pacific, has been analyzed for alkenones to reconstruct changes in the sea surface temperatures (SST) over the last 15 kyrs. A comparison of the core-top U 37 K′ value with the modern surface temperatures indicates that alkenones are produced at present in summer-fall season, a production seasonality probably identical to the one prevailing in the past, as suggested by evidences of enhanced sea ice cover and subsequent limitation of the phytoplankton growth period to summer-fall at the glacial/deglacial transition. The alkenone downcore profile indicated that summer SST at the early deglaciation period (15 kyrs BP) were around 5°C lower than today (ca. 11°C). A rapid SST increase (more than 3°C) was found to occur from 13

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“…Growing concerns about specific proxies for continental palaeotemperature and progress in the alkenone proxy for palaeo sea surface temperature (e.g., Volkman et al, 1980;Marlowe et al, 1984;Brassell et al, 1986;Prahl et al, 1989;Sikes et al, 1991;Conte et al, 1992;Rontani et al, 1997;Sonzogni et al, 1997;Herbert et al, 1998;Mü ller et al, 1998;Teece et al, 1998;Prahl et al, 2000;Epstein et al, 2001;Harada et al, 2006;Zhao et al, 2006) 0146-6380/$ -see front matter Ó 2007 Elsevier Ltd. All rights reserved. doi:10.1016All rights reserved.…”

Section: Introductionmentioning

confidence: 99%

Calibration of alkenone unsaturation index with growth temperature for a lacustrine species, Chrysotila lamellosa (Haptophyceae)

Sun¹,

Chu

Liu

et al. 2007

Organic Geochemistry

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Depth and seasonality of alkenone production along the California Margin inferred from a core top transect

Cited by 97 publications

References 40 publications

A 28‐ka history of sea surface temperature, primary productivity and planktonic community variability in the western Arabian Sea

A 28‐ka history of sea surface temperature, primary productivity and planktonic community variability in the western Arabian Sea

Alkenone sea surface temperature in the Okhotsk Sea for the last 15 kyr.

Calibration of alkenone unsaturation index with growth temperature for a lacustrine species, Chrysotila lamellosa (Haptophyceae)

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