Glacial–interglacial environmental changes inferred from molecular and compound-specific δ13C analyses of sediments from Sacred Lake, Mt. Kenya

Huang, Yongsong; Street-Perrott, F. Alayne; Perrott, RA; Metzger, Pierre; Eglinton, G.

doi:10.1016/s0016-7037(99)00074-5

Cited by 213 publications

(103 citation statements)

References 64 publications

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“…is coherent with a similar shift displayed by the δ 13 C of phytoplanktonic lipids in an African tropical lake (Sacred Lake, Kenya; Huang et al, 1999). Increased δ 13 C values for palmitic and behenic acids at the end of the LGM are attributed to lower atmospheric pCO 2 and higher pH leading to inorganic carbon limitation (low dissolved CO 2 ) in the lake waters.…”

Section: Origin Of Palmitic Behenic and Triacontanic Acidssupporting

confidence: 69%

“…Two grams of powdered sediment were used for free lipids extraction using an accelerated solvent extractor (ASE200, Dionex) with CH 2 Cl 2 :CH 3 OH (1:1). The carboxylic acids were separated from the total extract using solid phase extraction on Aminopropyl Bond Elute© cartridges according to Huang et al (1999). Then, they were converted into fatty acid methyl esters using anhydrous 2 % HCl in CH 3 OH.…”

Section: Sample Collection and Lipid Analysesmentioning

confidence: 99%

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Paleohydrological changes during the last deglaciation in Northern Brazil

Jacob

Huang

Disnar

et al. 2007

Quaternary Science Reviews

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We here report a reconstruction of hydrological balance variations in Northern Brazil for the last 20 ka deduced from the δD values of aquatic and land plant molecules extracted from the sediment infill of Lake Caçó. Our reconstructed precipitation, lake water isotope ratio and evaporation-evapotranspiration isotope effect allow us to obtain an estimate of moisture balance, and, to a lesser extent, precipitation amount and seasonality changes.

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Section: Origin Of Palmitic Behenic and Triacontanic Acidssupporting

confidence: 69%

Section: Sample Collection and Lipid Analysesmentioning

confidence: 99%

Paleohydrological changes during the last deglaciation in Northern Brazil

Jacob

Huang

Disnar

et al. 2007

Quaternary Science Reviews

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“…New analytical approaches applied on new records are needed in order to enhance our understanding of the nature, the extent and the origin of past paleoclimatic fluctuations. OM analyses have now proven their utility for paleoenvironmental reconstructions, in particular in lacustrine sedimentary records in temperate areas (Lallier-Vergès et al, 1993;Meyers and Lallier-Vergès, 1999;Manalt et al, 2001;Sifeddine et al, 1996), but rarely in tropical settings (Talbot and Livingstone, 1989;Street-Perrott et al, 1997;Sifeddine et al, 1998;2001;Ficken et al, 1998;Huang et al, 1999). Sedimentary lacustrine series are attractive targets to document paleoenvironmental changes because they generally offer high temporal resolution due to high sedimentation rates.…”

Section: Introductionmentioning

confidence: 99%

Major environmental changes recorded by lacustrine sedimentary organic matter since the last glacial maximum near the equator (Lagoa do Caçó, NE Brazil)

Jacob

Disnar

Boussafir

et al. 2004

Palaeogeography, Palaeoclimatology, Palaeoecology

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Sediment samples collected along a six-meter core, drilled in the deepest part of the Lagoa do Caçó (NE Brazil), have been investigated in order to determine source(s) and degradation conditions of the organic matter (OM) with special emphasis on paleoenvironmental implications. Bulk organic geochemistry (Rock-Eval pyrolysis, C/N determination, δ 13 C and δ 15 N measurement) and petrography combined with sedimentological evidence and radiocarbon dates allowed to identify four major intervals documenting major environmental changes that occurred during the last 20,000 years. The first interval, dating back to the end of the Last Glacial Maximum (LGM), contains well preserved OM derived from higher plants.This material was most probably produced in an ephemeral palustrine system and rapidly buried by sands. This level is thought to have been deposited under relatively arid climate conditions associated with strong but episodic rainfalls. Between 19,240 and 17,250 Cal yrs BP, the climate appears to have been more humid and seasonality more pronounced as suggested by the presence of a permanent lake. After a drastic environmental change dating back to 17,250 Cal yrs BP, the sediment became truly lacustrine with restricted mineral input and highly-degraded higher plant-derived organic matter. After that, a stepwise improvement in the preservation of OM occurred, as revealed by several pronounced shifts in the RockEval TpS2 signal. These changes could document abrupt climatically driven changes during the Lateglacial. Finally, around 5610 Cal yrs BP, environmental conditions, approaching those prevailing today were established. Minor climatic changes during the Holocene were * Corresponding author at current address: Laboratoire des Sciences du Climat et de l'Environnement (LSCE), Bât 12, Domaine du CNRS, Avenue de la Terrasse, F-91198 Gif-sur-Yvette Cedex, France. E-mail address: jeremy.jacob@lsce.cnrs-gif.fr 2 probably buffered by a high water table which might explain the lack of paleoenvironmental fluctuations.

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“…and low-altitude lakes in mountains (Figure 1), (including Lake Sacred [9,20,21], Lake Nkunga [22,23] and Lake Rutundu [24] in Mt. Kenya, Lake Kimilili in Mt.…”

Section: Global Paleo-c 3 /C 4 Records Since the Last Glacialmentioning

confidence: 99%