Different temperature dependence of marine-derived brGDGT isomers in a sediment core from the Chukchi Sea shelf

Gao, Chao; Yang, Yi; Yang, Huan; Zhang, Yige; Hong-mei, Wang; Yu, Xinxiao; Ruan, Xiaoyan

doi:10.1016/j.orggeochem.2020.104169

Cited by 4 publications

(4 citation statements)

References 70 publications

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“…First, they encourage proxy development beyond the well-studied soil/peat and lake sediment datasets. In particular, they support recent work in marine sediments ( 23 , 67 , 68 ), which exhibited the highest compound-specific temperature correlation in our dataset (fIa Meth ; r = 0.88), as well as in bones ( 39 ) and lacustrine SPM ( 38 ). The widespread trends also suggest that it may be possible to construct modern calibrations that join multiple sample types in future studies.…”

Section: Discussionsupporting

confidence: 91%

“…Temperature calibrations for brGDGTs in marine settings are an active area of research. Thus far, brGDGT production has been demonstrated in both deep ( 54 ) and shallow ( 75 ) marine water columns, and correlations have been found between marine surface sediment brGDGTs and both sea surface ( 67 , 68 ) and bottom water ( 23 ) temperatures. Because of these uncertainties and data availability constraints, we used the SST parameter for marine sediments in this study.…”

Section: Methodsmentioning

confidence: 99%

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Near-universal trends in brGDGT lipid distributions in nature

et al. 2022

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Bacterial brGDGT lipids are a prevalent tool in studies of terrestrial paleoclimate. Their distributions correlate empirically with environmental temperature and pH, and their ubiquity in terrestrial, freshwater, and marine environments gives them wide applicability. Whether correlations with temperature and pH emerge due to a physiological response of source organisms and/or a shift in bacterial community composition remains an open question with important implications for proxy development and application. We applied a newly described technique for grouping brGDGTs to a globally compiled dataset ( n = 3129) consisting of all modern sample media known to host brGDGTs. We found strong resemblances in the relationships between brGDGT fractional abundances and both temperature and pH across nearly all sample types examined. We also found near-universal connections between the brGDGTs themselves. Given the markedly different bacterial communities expected to inhabit these settings, these widespread relationships may suggest physiological and/or biochemical bases for observed brGDGT distributions.

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Section: Discussionsupporting

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Near-universal trends in brGDGT lipid distributions in nature

et al. 2022

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“…In addition, considering the small percentage of terrestrial organic matter as indicated by low branched and isoprenoid tetraethers (BIT) index values (avg. = 0.07; Gao et al, 2021) and high d 13 C org (avg. = -22.25‰; Zhang et al, 2018), these brassicasteol and dinosterol in R07 should be mainly from marine algae.…”

Section: Discussionmentioning

confidence: 99%

“…The historical SSTs at core R07 location were obtained from the NOAA Extended Reconstructed Sea Surface Temperature (ERSST) V5 (Huang et al, 2017), which is provided by the NOAA/OAR/ESRL PSD, Boulder, Colorado, USA (at https://www.esrl.noaa.gov/psd/ data/gridded/data.noaa.ersst.v5.html). The SST calculation is described in detail by Gao et al (2021). Considering the SST in winter (December, January and February, DJF) and spring (March, April and May, MAM) is -1.8°C, the SST of an average of summer (June, July and August, JJA) and fall (September, October and November, SON) is used in this paper.…”

Section: Environmental Datamentioning

confidence: 99%

Biomarker evidence of the water mass structure and primary productivity changes in the Chukchi Sea over the past 70 years

Gao

Ruan²,

Zhang³

et al. 2023

Front. Mar. Sci.

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The Chukchi Sea has experienced significant changes under global warming in the Common Era, including the shift of primary productivity. However, modern observations are too short to fully investigate the effects of environmental changes in this area. Here, we analyzed lipid biomarkers (e.g. long-chain n-alkanes, n-alkanols, n-alkanoic acids, diols, and sterols) from a sediment core (R07) collected from the Chukchi Sea shelf to determine phytoplankton primary productivity variations and factors influencing these changes over the past 70 years. Similar trends of the abundance of terrestrial ecosystem-derived compounds (e.g. long-chain n-alkanes, n-alkanols, n-alkanoic acids, and C32 1,15-diol) indicate that terrigenous input increased from ca. 1946 towards ca. 1983 and then decreased thereafter. In comparison, biomarkers with marine origin indicate that the ratio of diatoms to dinoflagellates increased after ca. 1983 towards the core-top (ca. 2011). Concurrent changes in terrigenous input and phytoplankton community indicated a shift in water mass structure at ca. 1983 (i.e. the Alaska Coastal Water decreased and the Bering Sea Water increased), which may be attributed to the phase shift of the Arctic Oscillation and/or unsynchronized flow changes in different water masses. Owing to the different water mass properties, the change of water mass structure caused intense water mixing and the resulting high turbidity in the study area, which led to light limitation for phytoplankton growth. These conditions probably account for the reduced phytoplankton primary productivity from ca. 1983 to ca. 2000 in the general trend of increasing. The results indicate that, in addition to global warming and sea ice retreat, other factors, such as change in regional water mass structure (i.e. different water masses), may also have a significant influence on the primary productivity and the phytoplankton community in the Chukchi Sea shelf.

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Global scale production of brGDGTs by benthic marine bacteria: Implication for developing ocean bottom environmental proxies

Xiao

Jiang

et al. 2022

Global and Planetary Change

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Different temperature dependence of marine-derived brGDGT isomers in a sediment core from the Chukchi Sea shelf

Cited by 4 publications

References 70 publications

Near-universal trends in brGDGT lipid distributions in nature

Near-universal trends in brGDGT lipid distributions in nature

Biomarker evidence of the water mass structure and primary productivity changes in the Chukchi Sea over the past 70 years

Global scale production of brGDGTs by benthic marine bacteria: Implication for developing ocean bottom environmental proxies

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