Distributions of soil branched glycerol dialkyl glycerol tetraethers from different climate regions of China

Wang, M.; Zheng, Zhuo; Zong, Yongqiang; Man, Meiling; Tian, Lin

doi:10.1038/s41598-019-39147-9

Cited by 22 publications

(15 citation statements)

References 35 publications

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“…In sum, the studies for the Kara Sea (De Jonge et al, 2016), the North Sea Basin (Dearing Crampton-Flood et al, 2018), the Tagus River basin (Warden et al, 2016), and the Berau River delta (Sinninghe Damsté, 2016) show enhanced fractional abundance of 6-methyl brGDGTs (particularly IIIa ) as marine influence was intensified. These findings, along with the strong predominance of brGDGT IIIa in the Mariana Trench sediments, suggest that the high proportion of brGDGT IIIa in total brGDGTs is a common phenomenon in marine environments where in situ production of brGDGTs is significant.…”

Section: High Proportion Of Brgdgt Iiia As a Common Phenomenon In Marmentioning

confidence: 98%

“…The peat samples are from 96 different peatlands around the world (Naafs et al, 2017). The river samples are from the Danube River (Freymond et al, 2016), the Yenisei River (De Jonge et al, 2015), and the Tagus River (Warden et al, 2016). The lake samples are from east African lakes (Russell et al, 2018), Chinese lakes (Dang et al, 2016b(Dang et al, , 2018Li et al, 2017), Lake St Front (Martin et al, 2019), Lake Lugano, and other lakes in the European Alps (Weber et al, 2018).…”

Section: Literature Data Compilationmentioning

confidence: 99%

“…Besides temporal variations in sediment cores, the fractional abundance of 6-methyl brGDGTs also changed from land to sea in modern samples. Warden et al (2016) analyzed brGDGTs along a transect from the Tagus River to the deep ocean off the Portuguese margin. Along this transect, the BIT index significantly decreased from 0.9 to < 0.1, reflecting an increase in marine contribution to the sedimentary OC pool (Fig.…”

Section: High Proportion Of Brgdgt Iiia As a Common Phenomenon In Marmentioning

confidence: 99%

“…Vertical profiles of (d) the proportion of GDGT IIIa , (e) δ 13 C OC , and (f) BIT index of a marine sediment core from the Kara Sea (De Jonge et al, 2016). Spatial distribution patterns of (g) average distribution of brGDGTs and (h) BIT index in the transect from the land to the ocean off the Portuguese coast (river floodplain, mudbelt, Lisbon canyon head, and lower Setúbal canyon) (Warden et al, 2016). Isosurface plots of (i) BIT index, (j) δ 13 C OC , and (k) the proportion of GDGT IIIa of the surface sediments from the Berau River delta (Sinninghe Damsté, 2016).…”

Section: High Proportion Of Brgdgt Iiia As a Common Phenomenon In Marmentioning

confidence: 99%

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Predominance of hexamethylated 6-methyl branched glycerol dialkyl glycerol tetraethers in the Mariana Trench: source and environmental implication

et al. 2020

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Abstract. Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are useful molecular indicators for organic carbon (OC) sources and the paleoenvironment. Their application in marine environments, however, is complicated because of a mixed terrestrial and marine source. Here, we examined brGDGTs in sediments from the Mariana Trench, the deepest ocean without significant terrestrial influence. Our result shows a strong predominance of hexamethylated 6-methyl brGDGT (IIIa′) (73.40±2.39 % of total brGDGTs) and an absence of 5-methyl brGDGTs, different from previously reported soils and marine sediments that comprised both 5-methyl and 6-methyl brGDGTs. This unique feature, combined with high δ13COC (-19.82±0.25 %), low OC∕TN ratio (6.72±0.84), low branched and isoprenoid tetraether (BIT) index (0.03±0.01), and high acyclic hexa- ∕ pentamethylated brGDGT ratio (7.13±0.98), support that brGDGTs in the Mariana Trench sediments are autochthonous rather than terrestrial products. The compiling of literature data shows that the enhanced fractional abundance of hexamethylated 6-methyl brGDGTs is a common phenomenon in continental margins when the marine influence was intensified. The cross plot of acyclic hexa- ∕ pentamethylated brGDGT ratio and fractional abundance of brGDGT IIIa′ provide a novel approach to distinguish terrestrial and marine-derived brGDGTs.

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Section: High Proportion Of Brgdgt Iiia As a Common Phenomenon In Marmentioning

confidence: 98%

Section: Literature Data Compilationmentioning

confidence: 99%

Section: High Proportion Of Brgdgt Iiia As a Common Phenomenon In Marmentioning

confidence: 99%

Section: High Proportion Of Brgdgt Iiia As a Common Phenomenon In Marmentioning

confidence: 99%

See 2 more Smart Citations

Predominance of hexamethylated 6-methyl branched glycerol dialkyl glycerol tetraethers in the Mariana Trench: source and environmental implication

et al. 2020

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“…The soil samples are from globally distributed soils (De Jonge et al, 2014a;Ding et al, 2015;Xiao et al, 2015;Yang et al, 2015;Lei et al, 2016;Wang et al, 2016;Li et al, 2018;Wang et al, 2018;Zang et al, 2018;Wang et al, 2019). The peat samples are from 96 different peatlands around the world (Naafs et al, 2017 (Dang et al, 2016;Li et al, 2017;Dang et al, 2018), Lake St Front (Martin et al, 2019), Lake Lugano and other lakes in the European Alps (Weber et al, 2018).…”

Section: Literature Data Compilationmentioning

confidence: 99%

Predominance of hexamethylated 6-methyl branched glycerol dialkyl glycerol tetraethers in the Mariana Trench: Source and environmental implication

Xiao¹,

Wang²,

Liu³

et al. 2019

Preprint

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Abstract. Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are useful molecular indicators for organic carbon (OC) source and paleoenvironment. Their application in marine environments, however, is complicated because of the mixed terrestrial and marine contributions to brGDGTs. Here, we employ two dimensional (2D) ultrahigh-performance liquid chromatography-mass spectrometry (UHPLC-MS) to analyze brGDGTs in sediments from the Challenger Deep, Mariana Trench, the deepest ocean in the absent of terrestrial influence. The unique feature is the absence of 5-methyl brGDGTs, and the strong predominance of hexamethylated 6-methyl brGDGT (IIIa') (73.4&#8201;&#177;2.4&#8201;% of total brGDGTs). The brGDGTs-reconstructed pH is 8.22&#8201;&#177;&#8201;0.07, close to seawater pH. This, combined with characteristics of &#948;13C (&#8722;&#8201;19.82&#8201;&#177;&#8201;0.25&#8201;%), OC&#8201;/&#8201;TN ratio (6.72&#8201;&#177;&#8201;0.84), branched and isoprenoid tetraether (BIT) index (0.03&#8201;&#177;&#8201;0.01) and the acyclic hexa-/pentamethylated brGDGTs ratio (7.13&#8201;&#177;&#8201;0.98), strongly suggest that brGDGTs are of autochthonous products from benthic bacteria or planktonic bacteria. The compiling of literature data reveals that enhanced fractional abundance of hexamethylated 6-methyl brGDGTs is common in diverse continental margins when the marine influence became intensified. This may reflect an adaption of brGDGTs-producing bacteria to weak alkaline seawater and low ambient temperature. Based on the global dataset, the cross plot of acyclic hexa-/pentamethylated brGDGTs ratio and fractional abundance of brGDGT-IIIa' is an effective approach to distinguish the terrestrial vs. marine provenance of brGDGTs.

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Relation between soil glycerol dialkyl glycerol tetraethers and temperature in different climatic regions in China

Zhang,

Sun,

Leng

et al. 2024

Earth Surf Processes Landf

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Temperature variation in the past periods can provide valuable insights into the characteristics and driving mechanisms of current global warming and future changes. Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are commonly used to as a temperature proxy to quantitatively reconstruct past temperature changes. However, it still remains unclear whether the relation between brGDGTs and temperature is influenced by other environmental factors, thereby affecting the accuracy of quantitative reconstructions. A comprehensive analysis of the relation between brGDGTs and temperature across various climate regions can greatly enhance the accuracy of reconstructing past temperature changes. Here, we investigate the distribution patterns of soil brGDGTs using 28 new topsoils collected from altitudes ranging from 2100 to 4000 m.a.s.l. in the Hengduan Mountains in the southeastern margin of the Tibetan Plateau (TP), compiled previously published soil brGDGT data in China. Our results reveal distinct distribution patterns of soil brGDGTs between humid and arid regions. Furthermore, we further investigated the correlation between brGDGT indices and various environmental factors from both altitudinal and regional scales. At the altitudinal scale, brGDGT indices exhibit a stronger correlation with mean annual air temperature (MAAT) in alkaline soils (pH > 7) than that in acidic soils (pH < 7). At the regional scale, this correlation is higher in alkaline soils than that in acidic soils as well and is stronger in humid soils (mean annual precipitation [MAP] > 800 mm) than that in semi‐humid and semi‐arid soil (400 < MAP < 800 mm) and arid soil (MAP < 400 mm). In addition, brGDGT‐inferred temperature is more affected by MAP in humid alkaline soils but less affected in humid acidic soils. Therefore, caution is needed to use suitable brGDGT index for palaeotemperature reconstructions in various climate regions.

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Distributions of soil branched glycerol dialkyl glycerol tetraethers from different climate regions of China

Cited by 22 publications

References 35 publications

Predominance of hexamethylated 6-methyl branched glycerol dialkyl glycerol tetraethers in the Mariana Trench: source and environmental implication

Predominance of hexamethylated 6-methyl branched glycerol dialkyl glycerol tetraethers in the Mariana Trench: source and environmental implication

Predominance of hexamethylated 6-methyl branched glycerol dialkyl glycerol tetraethers in the Mariana Trench: Source and environmental implication

Relation between soil glycerol dialkyl glycerol tetraethers and temperature in different climatic regions in China

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