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Descripción

Soil-derived branched glycerol dialkyl glycerol tetraethers (brGDGTs) in marine river fan sediments have a potential use for determining changes in the mean annual temperature (MAT) and pH of the river watershed soils. Prior to their incorporation in marine sediments, the compounds are transported to the marine system by rivers. However, emerging evidence suggests that the brGDGTs in freshwater systems can be derived from both soil run-off and in situ production. The production of brGDGTs in the river system can complicate the interpretation of the brGDGT signal delivered to the marine system. Therefore, we studied the distribution of brGDGT lipids in suspended particulate matter (SPM) of the Yenisei River. Chromatographic improvements allowed quantification of the recently described hexamethylated brGDGT isomer, characterized by having two methyl groups at the 6/6' instead of the 5/5' positions, in an environmental dataset for the first time. This novel compound was the most abundant brGDGT in SPM from the Yenisei. Its fractional abundance correlated well with that of the 6-methyl isomer of the hexamethylated brGDGT that contains one cyclopentane moiety. The Yenisei River watershed is characterized by large differences in MAT (>11 °C) as it spans a large latitudinal range (46-73°N), which would be expected to be reflected in brGDGT distributions of its soils. However, the brGDGT distributions in its SPM show little variation. Furthermore, the reconstructed pH values are high compared to the watershed soil pH. We, therefore, hypothesize that the brGDGTs in the Yenisei River SPM are predominantly produced in situ and not primarily derived from erosion of soil. This accounts for the absence of a change in the temperature signal, as the river water temperature is more stable. Using a lake calibration, the reconstructed temperature values agree with the mean summer temperatures (MST) recorded. The brGDGTs delivered to the sea by the Yenisei River during this season are thus not soil-derived, possibly complicating the use of brGDGTs in marine sediments for palaeoclimate reconstructions.

Pertenece a

PANGAEA - Publishing Network for Geoscientific & Environmental Data  

Autor(es)

De Jonge, Cindy -  Stadnitskaia, Alina -  Hopmans, Ellen C -  Cherkashov, Georgy A -  Fedotov, Andrey -  Sinninghe Damsté, Jaap S - 

Id.: 69898929

Idioma: inglés  - 

Versión: 1.0

Estado: Final

Tipo:  application/zip, 6 datasets - 

Palabras clave), averaged from June to September -  Area -  Area/locality -  BIT -  Branched and isoprenoid tetraether index -  Branched glycerol dialkyl glycerol tetraether -  Branched glycerol dialkyl glycerol tetraether, Ia -  Branched glycerol dialkyl glycerol tetraether, Ib -  Branched glycerol dialkyl glycerol tetraether, Ic -  Branched glycerol dialkyl glycerol tetraether, IIa -  Branched glycerol dialkyl glycerol tetraether, IIb -  Branched glycerol dialkyl glycerol tetraether, IIc -  Branched glycerol dialkyl glycerol tetraether, IIIa -  Branched glycerol dialkyl glycerol tetraether, IIIa' -  Branched glycerol dialkyl glycerol tetraether, IIIb -  Branched glycerol dialkyl glycerol tetraether, IIIb' -  Branched glycerol dialkyl glycerol tetraether, IIIc -  Branched glycerol dialkyl glycerol tetraether, IIIc' -  Branched glycerol dialkyl glycerol tetraether per unit mass particulate organic carbon -  brGDGT -  brGDGT/POC -  brGDGT Ia -  brGDGT Ib -  brGDGT Ic -  brGDGT IIa -  brGDGT IIb -  brGDGT IIc -  brGDGT IIIa -  brGDGT IIIb -  brGDGT IIIc -  Carbon, organic, particulate -  CBT -  Comment -  Cren -  Cren/POC -  Crenarchaeol -  Crenarchaeol per unit mass particulate organic carbon -  Cyclization ratio of branched tetraethers -  DEPTH, soil -  DEPTH, water -  Depth soil -  Depth water -  Event -  fracrtion -  fraction -  IPL lipids, relative to the total of IPL and CL brGDGTs -  lake calibration (Pearson et al., 2011) -  MAT -  MBT' -  Methylation index of dominant branched tetraethers -  MST -  NIOZ_UU -  NIOZ Royal Netherlands Institute for Sea Research, and Utrecht University -  pH -  POC -  Ratio -  Reconstructed -  Reference -  Reference/source -  Sample type -  Samp type -  soil/water -  soil calibration (Peterse et al., 2012) -  Soil type -  surface water <2 m -  Temp -  Temperature, annual mean -  Temperature, summer mean -  Temperature, water -  water pH - 

Cobertura:  MEDIAN LATITUDE: 60.771509 * MEDIAN LONGITUDE: 95.040078 * SOUTH-BOUND LATITUDE: 46.130000 * WEST-BOUND LONGITUDE: 80.400000 * NORTH-BOUND LATITUDE: 73.500000 * EAST-BOUND LONGITUDE: 110.000000 * DATE/TIME START: 2009-08-25T00:00:00 * DATE/TIME END: 2010-07-11T00:00:00 - 

Tipo de recurso: Dataset  - 

Tipo de Interactividad: Expositivo

Nivel de Interactividad: muy bajo

Audiencia: Estudiante  -  Profesor  -  Autor  - 

Estructura: Atomic

Coste: no

Copyright: sí

: CC-BY: Creative Commons Attribution 3.0 Unported

Formatos:  application/zip, 6 datasets - 

Requerimientos técnicos:  Browser: Any - 

Relación: [IsBasedOn] Supplement to: De Jonge, Cindy; Stadnitskaia, Alina; Hopmans, Ellen C; Cherkashov, Georgy A; Fedotov, Andrey; Sinninghe Damsté, Jaap S (2014): In situ produced branched glycerol dialkyl glycerol tetraethers in suspended particulate matter from the Yenisei River, Eastern Siberia. Geochimica et Cosmochimica Acta, 125, 476-491, https://doi.org/10.1016/j.gca.2013.10.031
[References] De Jonge, Cindy; Stadnitskaia, Alina; Hopmans, Ellen C (2015): Corrigendum to "In situ produced branched glycerol dialkyl glycerol tetraethers in suspended particulate matter from the Yenisei River, Eastern Siberia" [Geochim. Cosmochim. Acta 125 (2014) 476?491]. Geochimica et Cosmochimica Acta, 150, 345-346, https://doi.org/10.1016/j.gca.2014.12.001

Fecha de contribución: 14-feb-2018

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