A biomarker approach to the organic matter deposited in the North Atlantic during the last climatic cycle

Villanueva, Joan; Grimalt, Joan O.; Cortijo, Elsa; Vidal, Laurence; Labeyriez, Laurent

doi:10.1016/s0016-7037(97)83123-7

Cited by 89 publications

(53 citation statements)

References 61 publications

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“…In order to differentiate odd numbered long-chain n-alkanes from higher plant material and the minor input of long-chain n-alkanes without odd over even predominance from other potential sources, we followed the approach developed by Villanueva et al (1997). This approach assumes that the even-numbered long-chain nalkanes (C 20 − C 34 ) in marine sediments reflect microbial input or reworking of odd-numbered n-alkanes and thus an equal amount of odd numbered long-chain n-alkanes does not originate from terrestrial higher plant material.…”

Section: Accumulation Rates Of N-alkanes and N-alkan-1-olsmentioning

confidence: 99%

“…This approach is supported by laboratory experiments that found an alteration in hydrocarbon composition and significant input of even-numbered long-chain n-alkanes due to bacterial re-working (Grimalt et al, 1988) as well as soil studies that indicate a decrease in n-alkane odd over even predominance with soil depth due to microbial reworking (Buggle et al, 2010). Therefore, the sum of the odd-numbered C 27 to C 33 n-alkane homologues was corrected for the input of reworked n-alkanes by subtracting the sum of the even-numbered C 26 to C 34 n-alkane homologues by using: Villanueva et al, 1997) where A plant is the total amount of higher plant (non-reworked) nalkanes for each sample in ng/g and C 26 − C 34 the abundance of the individual n-alkanes in ng/g. We must note that as higher plants to some extent also produce even-numbered long-chain n-alkanes (e.g., Chikaraishi and Naraoka, 2006), the resulting A plant record leads to an under estimation of the accumulation of higher plant material.…”

Section: Accumulation Rates Of N-alkanes and N-alkan-1-olsmentioning

confidence: 99%

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Strengthening of North American dust sources during the late Pliocene (2.7 Ma)

Naafs

Hefter

Acton

et al. 2012

Earth and Planetary Science Letters

128

156

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a b s t r a c t a r t i c l e i n f oHere we present orbitally-resolved records of terrestrial higher plant leaf wax input to the North Atlantic over the last 3.5 Ma, based on the accumulation of long-chain n-alkanes and n-alkanl-1-ols at IODP Site U1313. These lipids are a major component of dust, even in remote ocean areas, and have a predominantly aeolian origin in distal marine sediments. Our results demonstrate that around 2.7 million years ago (Ma), coinciding with the intensification of the Northern Hemisphere glaciation (NHG), the aeolian input of terrestrial material to the North Atlantic increased drastically. Since then, during every glacial the aeolian input of higher plant material was up to 30 times higher than during interglacials. The close correspondence between aeolian input to the North Atlantic and other dust records indicates a globally uniform response of dust sources to Quaternary climate variability, although the amplitude of variation differs among areas. We argue that the increased aeolian input at Site U1313 during glacials is predominantly related to the episodic appearance of continental ice sheets in North America and the associated strengthening of glaciogenic dust sources. Evolutional spectral analyses of the n-alkane records were therefore used to determine the dominant astronomical forcing in North American ice sheet advances. These results demonstrate that during the early Pleistocene North American ice sheet dynamics responded predominantly to variations in obliquity (41 ka), which argues against previous suggestions of precession-related variations in Northern Hemisphere ice sheets during the early Pleistocene.

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Section: Accumulation Rates Of N-alkanes and N-alkan-1-olsmentioning

confidence: 99%

Section: Accumulation Rates Of N-alkanes and N-alkan-1-olsmentioning

confidence: 99%

Strengthening of North American dust sources during the late Pliocene (2.7 Ma)

Naafs

Hefter

Acton

et al. 2012

Earth and Planetary Science Letters

128

156

View full text Add to dashboard Cite

show abstract

“…During these events North Atlantic deepwater formation came to a halt and the deep North Atlantic basin was poorly ventilated . Published alkenone records demonstrate the opposite with periods of low alkenone abundances during Heinrich(-like) events, reflecting a collapse of the phytoplankton community due to harsh surface water conditions (Stein et al, 2009;Villanueva et al, 1997). Recent high-resolution work from the Iberian Margin also shows no major influence of changes in bottom water ventilation on alkenone concentrations during the last 70 ka (Incarbona et al, 2010).…”

Section: Period Between 294 and 245 Ma: Intensification Of The Nhgmentioning

confidence: 99%

Late Pliocene changes in the North Atlantic Current

Naafs

Stein

Hefter

et al. 2010

Earth and Planetary Science Letters

117

154

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“…Ž pigments Table 2 , short-chain n-alkanes e.g., Eglinton and Hamilton, 1963;Venkatesan et al, . 1987;Madureira et al, 1995 Salasoo, 1987;Villanueva et al, 1997 . The synthesis of long-chain n-alkanes by some special sulfatereducing bacteria seems to be of minor importance Ž .…”

Section: Biomarkers As Organic-carbon Source and Environmental Indicamentioning

confidence: 99%

Biomarkers as organic-carbon-source and environmental indicators in the Late Quaternary Arctic Ocean: problems and perspectives

1999

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In order to examine the variation in marine and terrigenous sources of the organic matter during the last 15,000 Cal. yr Ž BP, hydrogen index values, CrN ratios, and specific biomolecules short-and long-chain n-alkanes, short-chain fatty acids, . sterols, alkenones, and pigments were determined in three sediment cores from the Laptev Sea continental margin. The results show that the interpretation of the biomarker data is much more complicated and less definitive in comparison to similar data sets from low-latitude open-ocean environments. This is mainly caused by the complexity of the Arctic Ocean system, which is characterized by a high seasonality of sea-ice cover and primary productivity, sea-ice sediment transport Ž . and a high fluvial supply of freshwater aquatic organic matter. A combination of organic geochemical, organic petrographic and micropaleontological data may yield to a more precise identification of organic-carbon sources for these Ž . complex systems. On the Laptev Sea shelf cores KD9502-14 and PS2725-5 , terrigenous organic-carbon input controlled by river discharge seems to be predominant during the last about 10,000 Cal. yr BP. Maximum supply of terrigenous organic Ž . carbon was reached in the Early Holocene i.e., about 9000-10,000 Cal. yr BP . Further offshore at the upper continental Ž . slope core PS2458-4 , a major change in organic-composition occurred near 10,000 Cal. yr BP. During this period hydrogen indices as well as the amounts of short-chain n-alkanes, short-chain fatty acids, dinosterol and brassicasterol significantly increased, indicating increased relative proportions of marine organic matter preserved in the later time interval. q 1999 Elsevier Science B.V. All rights reserved.

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A biomarker approach to the organic matter deposited in the North Atlantic during the last climatic cycle

Cited by 89 publications

References 61 publications

Strengthening of North American dust sources during the late Pliocene (2.7 Ma)

Strengthening of North American dust sources during the late Pliocene (2.7 Ma)

Late Pliocene changes in the North Atlantic Current

Biomarkers as organic-carbon-source and environmental indicators in the Late Quaternary Arctic Ocean: problems and perspectives

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