Assessing hydroxylated isoprenoid GDGTs as a paleothermometer for the tropical South China Sea

Yang, Yi; Gao, Chao; Dang, Xinyue; Ruan, Xiaoyan; Xie, Shucheng; Li, Xuejie; Yao, Yongjian; Yang, Huan

doi:10.1016/j.orggeochem.2017.10.014

Cited by 20 publications

(21 citation statements)

References 33 publications

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“…The RI-OH values varied from 1.57 to 1.79 (Suppl. Table 5), which agree with recently reported data for the same region (1.50-1.75) (Lü et al, 2015;Yang et al, 2018). SST estimates based on the calibration suggested by Lü et al (2015) for the Chinese marginal sea (CMS), were within a range of 23.3-31.2 °C (Fig.…”

Section: Distribution Of Gdgts and Ri-oh-derived Temperaturessupporting

confidence: 90%

“…other reported data of OH-GDGTs in the surface sediments in the SCS from water depths ranging between 3 m and 4405 m (Lü et al, 2015;Yang et al, 2018). By combining these data, we observed a positive logarithmic correlation between and water depth (R 2 = 0.58), but a negative logarithmic correlation between [OH-2] and water depth (R 2 = 0.66) ( Fig.…”

Section: Distribution Of Gdgts and Ri-oh-derived Temperaturessupporting

confidence: 70%

“…8b), indeed suggesting different thermal responses of distinct archaeal communities. This is supported by an observation of a "concave" relationship between the relative abundance of OH-2 and SST in SCS, which was explained as being due to the different responses of archaeal lipids to ambient temperature depending on whether SST is below or above 25 °C (Yang et al, 2018).…”

Section: Source Of Oh-gdgts and Their Influences On Ri-oh-sst Estimatesmentioning

confidence: 64%

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Comparison of the U37K′, LDI, TEX86H and RI-OH temperature proxies in the northern shelf of the South China Sea

Wei

Jia

Hefter

et al. 2019

Preprint

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Abstract. The temperature proxies U37K&#8242;, LDI, TEX86H and RI-OH are derived from lipid biomarkers, namely long-chain alkenones from coccolithophorids, archaeal glycerol dialkyl glycerol tetraethers (GDGTs), long-chain diols ascribed tentatively to eustigmatophytes, and archaeal OH-GDGTs, respectively. The applicability of these proxies has been examined in the South China Sea (SCS), but most of these studies were focused on a single proxy and hence did not allow for a direct comparison between them. In this study, we investigated the above 4 proxies in the same set of surface sediment samples in the northern SCS shelf and related them to local sea surface temperature (SST), which allowed us to assess whether they represent certain seasons or are impaired by terrestrial influences, as well as to infer the preferred habitats of their source organisms. Terrestrial organic inputs appeared to have an impact on LDI, TEX86H and RI-OH proxies near the coast and lead to colder LDI and TEX86H derived temperatures, but a warmer RI-OH estimate in this region. After excluding samples influenced by terrestrial organic input, we found that LDI-derived temperature agreed well with annual SSTs, while U37K&#8242; reflected mainly spring SST and both TEX86H and RI-OH indices were correlated with winter SST. The differential seasonal biases of these biomarker-derived temperatures observed here suggest that each biomarker&#8217;s source organism responds differently to regional marine environmental changes in an annual cycle. Specifically, marine eustigmatophytes are likely insensitive to nutrient variations and hence show the lowest seasonal variations, while coccolithophorids could have bloomed in late spring, when nutrient inputs by freshwater are usually highest. GDGT- and OH-GDGT-producing planktonic archaea likely thrive in winter, when conditions, such as relatively high nutrients levels, low light, and high concentrations of SPM in the upper water due to the enhancement of vertical mixing driven by a combination of surface cooling and strong winter monsoon winds, are favorable, although not clearly known.

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Section: Distribution Of Gdgts and Ri-oh-derived Temperaturessupporting

confidence: 90%

Section: Distribution Of Gdgts and Ri-oh-derived Temperaturessupporting

confidence: 70%

Section: Source Of Oh-gdgts and Their Influences On Ri-oh-sst Estimatesmentioning

confidence: 64%

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Comparison of the U37K′, LDI, TEX86H and RI-OH temperature proxies in the northern shelf of the South China Sea

Wei

Jia

Hefter

et al. 2019

Preprint

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“…RI‐OH is based on hydroxylated isoprenoid glycerol dialkyl glycerol tetraethers (OH‐GDGTs) produced by ammonia oxidizing Group I.1a Thaumarchaeota (Elling et al, , , ; Liu et al, ; Sinninghe Damsté et al, ). Below 25 °C, RI‐OH values increase with temperature due to increased OH‐GDGT cyclization (Lü et al, ; Yang et al, ; Zhu et al, ). Lü et al () have also developed RI‐OH′, which is an alternative version of RI‐OH for temperature estimates in polar oceans.…”

Section: Introductionmentioning

confidence: 99%

Western Mediterranean Sea Paleothermometry Over the Last Glacial Cycle Based on the Novel RI‐OH Index

Davtian

Ménot

Fagault

et al. 2019

Paleoceanog and Paleoclimatol

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RI‐OH (ring index of hydroxylated tetraethers) has recently been proposed to reconstruct paleotemperatures in middle‐ to low‐latitude marginal seas. However, RI‐OH has barely been tested in marginal seas under substantial terrigenous inputs. Here we analyze tetraether lipids in two adjacent marine cores from the Gulf of Lions. We then test for the first time the RI‐OH paleothermometer from 160 to 9 ka BP in the western Mediterranean Sea. While terrigenous inputs prevent TEX86 (TetraEther indeX of tetraethers consisting of 86 carbon atoms) from behaving as a paleothermometer, RI‐OH is generally consistent with other paleothermometric proxies. RI‐OH also responds systematically and coherently to glacial‐interglacial transitions as well as to abrupt climatic events. The average difference between RI‐OH temperatures and November–May UK′37 (C37 ketone unsaturation ratio) temperatures is −2.0 °C with a standard error of 0.4 °C based on 249 RI‐OH‐UK′37 comparisons. This systematic difference suggests that hydroxylated tetraethers and alkenones record different temperatures, for instance, winter and/or subsurface temperatures for RI‐OH. Another source of bias could be linked to the available RI‐OH‐temperature calibration, which clearly needs more work at the global and regional scales, notably for semienclosed basins such as the Mediterranean Sea. Nevertheless, our RI‐OH‐based interglacial‐glacial anomalies are of 10 °C, a value within the high end of anomalies from previously published temperature records in the western Mediterranean Sea (from 3 to 13 °C). The RI‐OH‐based temperature anomalies also confirm the regional differences and seasonal contrasts in interglacial‐glacial anomalies produced by models.

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“…8). Conversely, OH-2/OHs may be more suitable as an SST proxy in the tropical South China Sea where SST is above 25 °C (Yang et al 2018). The calibration equations relating SOT (100-200 m) to RI-OH′ and OH-0/ OHs obtained from least-squares regression are: OH-0/OHs = −0.1636 × SOT + 0.6138; R 2 = 0.86, n = 16, p < 0.01 (1) RI-OH' = 0.2210 × SOT + 0.5061; R 2 = 0.86, n = 16, p < 0.01 2The analytical errors were 0.03 and 0.02 °C for OH-0/ OHs and RI-OH′, respectively, and the calibration errors of OH-0/OHs and RI-OH′ were 0.15 and 0.14 °C, respectively.…”

Section: Evaluation Of Gdgt-based Sst Indicesmentioning

confidence: 99%

Distribution and source of glycerol dialkyl glycerol tetraethers (GDGTs) and the applicability of GDGT-based temperature proxies in surface sediments of Prydz Bay, East Antarctica

et al. 2020

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Reliable records of Southern Ocean seawater palaeotemperatures are important because this region plays a significant role in regulating global climate change. Biomarkers such as GDGT-based indices have been effectively used to reconstruct seawater temperatures. We analysed the composition and distribution of iGDGTs, OH-GDGTs and brGDGTs and calculated GDGT-based temperature indices in surface sediments from Prydz Bay, East Antarctica. Our results showed that iGDGTs, OH-GDGTs and brGDGTs are all produced in situ, with iGDGTs and OH-GDGTs mostly synthesized by Thaumarchaeota. Concentrations of iGDGTs, OH-GDGTs and brGDGTs showed similar spatial distributions and decreased from the continental shelf towards the deep ocean. The highest concentrations were in the inner bay, which is attributed to a combination of (1) bathymetry that reduces water exchange, (2) the Prydz Bay Gyre stabilizing the upper water column and (3) sea ice that releases archaea and bacteria. Among the temperature indices based on iGDGTs, OH-GDGTs and combinations therein, those based on OH-GDGTs showed the strongest correlation with seawater temperature. Some OH-GDGT-based indices (e.g., OH-0/OHs, OH-1/OHs, OH-2/OHs and RI-OH′) exhibited a stronger correlation with annual subsurface ocean temperature (100–200 m), which may be related to archaeal habitats and production mechanisms. Our study suggests that RI-OH′ and OH-0/OHs could be used as indicators of annual subsurface ocean temperature in Antarctic marginal seas.

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Assessing hydroxylated isoprenoid GDGTs as a paleothermometer for the tropical South China Sea

Cited by 20 publications

References 33 publications

Comparison of the U<sub>37</sub><sup>K′</sup>, LDI, TEX<sub>86</sub><sup>H</sup> and RI-OH temperature proxies in the northern shelf of the South China Sea

Comparison of the U<sub>37</sub><sup>K′</sup>, LDI, TEX<sub>86</sub><sup>H</sup> and RI-OH temperature proxies in the northern shelf of the South China Sea

Western Mediterranean Sea Paleothermometry Over the Last Glacial Cycle Based on the Novel RI‐OH Index

Distribution and source of glycerol dialkyl glycerol tetraethers (GDGTs) and the applicability of GDGT-based temperature proxies in surface sediments of Prydz Bay, East Antarctica

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Assessing hydroxylated isoprenoid GDGTs as a paleothermometer for the tropical South China Sea

Cited by 20 publications

References 33 publications

Comparison of the U&lt;sub&gt;37&lt;/sub&gt;&lt;sup&gt;K′&lt;/sup&gt;, LDI, TEX&lt;sub&gt;86&lt;/sub&gt;&lt;sup&gt;H&lt;/sup&gt; and RI-OH temperature proxies in the northern shelf of the South China Sea

Comparison of the U&lt;sub&gt;37&lt;/sub&gt;&lt;sup&gt;K′&lt;/sup&gt;, LDI, TEX&lt;sub&gt;86&lt;/sub&gt;&lt;sup&gt;H&lt;/sup&gt; and RI-OH temperature proxies in the northern shelf of the South China Sea

Western Mediterranean Sea Paleothermometry Over the Last Glacial Cycle Based on the Novel RI‐OH Index

Distribution and source of glycerol dialkyl glycerol tetraethers (GDGTs) and the applicability of GDGT-based temperature proxies in surface sediments of Prydz Bay, East Antarctica

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Comparison of the U<sub>37</sub><sup>K′</sup>, LDI, TEX<sub>86</sub><sup>H</sup> and RI-OH temperature proxies in the northern shelf of the South China Sea

Comparison of the U<sub>37</sub><sup>K′</sup>, LDI, TEX<sub>86</sub><sup>H</sup> and RI-OH temperature proxies in the northern shelf of the South China Sea