<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.svg"><mml:mrow><mml:msubsup><mml:mi mathvariant="normal">U</mml:mi><mml:mrow><mml:mn>38</mml:mn><mml:mi mathvariant="normal">M</mml:mi><mml:mi mathvariant="normal">E</mml:mi></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">K</mml:mi></mml:mrow><mml:mo>′</mml:mo></mml:msup></mml:mrow></mml:msubsup></mml:mrow></mml:math> Expands the linear dynamic range of the alkenone sea surface temperature proxy

Novak, Joseph B; McGrath, Sarah M.; Wang, Karen J.; Liao, Sian; Clemens, Steven C.; Kuhnt, Wolfgang; Huang, Yongsong

doi:10.1016/j.gca.2022.04.021

Cited by 10 publications

(13 citation statements)

References 95 publications

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“…(1998) and Novak et al. (2022) are very similar to each other (Figure S1 in Supporting Information ), with an offset of approx. 0.4°C toward colder temperatures of the values produced with the equation by Novak et al.…”

Section: Methodssupporting

confidence: 67%

“…The resultant SST Uk′37 records based on the equations fromMüller et al (1998) andNovak et al (2022) are very similar to each other (FigureS1in Supporting Information S1), with an offset of approx. 0.4°C toward colder temperatures of the values produced with the equation byNovak et al (2022) when compared to those produced with the equation byMüller et al (1998). To allow comparison with published SST Uk′37 we use the calibration method ofMüller et al (1998).…”

mentioning

confidence: 63%

“…Regarding the SST Uk′37 estimates we also tested the equation recently published by Novak et al. (2022) which uses a Bayesian approach:

{\mathrm{U}}_{37}^{{\mathrm{K}}^{\prime }}=0.032\,\mathrm{S}\mathrm{S}\mathrm{T}+0.081

…”

Section: Methodsmentioning

confidence: 99%

“…Regarding the SST Uk′37 estimates we also tested the equation recently published by Novak et al (2022) which uses a Bayesian approach:…”

Section: Alkenone and N-alkanesmentioning

confidence: 99%

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A Comparison Study of Mg/Ca‐, Alkenone‐, and TEX₈₆‐Derived Temperatures for the Brazilian Margin

Bahr

Jaeschke

Hou

et al. 2023

Paleoceanog and Paleoclimatol

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The reconstruction of accurate sea‐surface temperatures (SST) is of utmost importance due to the ocean’s central role in the global climate system. Yet, a number of environmental processes might bias reliable SST estimations. Here, we investigate the fidelity of SST reconstructions for the western tropical South Atlantic (WTSA) for the interval covered by Marine Isotope Stages (MIS) 6–5, utilizing a core collected off eastern Brazil at ∼20°S. This interval was selected as previous SST estimates based on Mg/Ca ratios of planktic foraminifera suggested a peculiar pooling of warm surface waters in the WTSA during MIS 6 despite glacial boundary conditions. To ground‐truth the Mg/Ca‐based SST data we generated SST reconstructions on the same core material using the alkenone and TEX86 paleothermometers. Comparison with alkenone‐based temperature estimates corroborate the previous Mg/Ca‐based SST reconstructions, supporting the suggestion of a warm‐water anomaly during MIS 6. In contrast, TEX86‐derived temperatures, albeit representing annual mean SST in recent core top samples, are up to 6°C colder than Mg/Ca‐ and alkenone‐based SST reconstructions. We interpret the periods of anomalously cold TEX86‐temperatures as a result of a vertical migration of the TEX86 producers (heterotrophic marine Thaumarchaeota) towards greater water depths, following food availability during phases of enhanced fluvial suspension input. Likewise, the data suggest that alkenone‐based SST are, albeit to a minor degree when compared to TEX86, affected by river run‐off and/or a seasonal bias in the growth season of haptophyte algae.

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Section: Methodssupporting

confidence: 67%

mentioning

confidence: 63%

“…Regarding the SST Uk′37 estimates we also tested the equation recently published by Novak et al. (2022) which uses a Bayesian approach:

{\mathrm{U}}_{37}^{{\mathrm{K}}^{\prime }}=0.032\,\mathrm{S}\mathrm{S}\mathrm{T}+0.081

…”

Section: Methodsmentioning

confidence: 99%

“…Regarding the SST Uk′37 estimates we also tested the equation recently published by Novak et al (2022) which uses a Bayesian approach:…”

Section: Alkenone and N-alkanesmentioning

confidence: 99%

See 2 more Smart Citations

A Comparison Study of Mg/Ca‐, Alkenone‐, and TEX₈₆‐Derived Temperatures for the Brazilian Margin

Bahr

Jaeschke

Hou

et al. 2023

Paleoceanog and Paleoclimatol

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show abstract

“…Total lipid extracts were purified by column chromatography with silica gel using the following sequence of eluents: n-hexane, DCM, and MeOH. The DCM fractions containing LCAs were further purified using column chromatography with silver nitrate-impregnated silica gel (∼10 weight %, +230 mesh from ALDRICH) with DCM and ethyl acetate (Novak et al, 2022). Following the method reported by Zheng et al (2017), LCAs in the ethyl acetate fractions were analyzed using an Agilent 8890 gas chromatography (GC) system equipped with a flame ionization detector (FID) and a Restek Rtx-200 GC column (105 m × 250 μm × 0.25 μm) at Xi'an Jiaotong University, China.…”

Section: Alkenone Analysismentioning

confidence: 99%

Pre‐Industrial (1750–1850 CE) Cold Season Warmth in Northeastern China

Yao

Wang

Huang

et al. 2023

Geophysical Research Letters

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Global mean annual temperatures have shown an accelerated warming trend in the last few decades in response to increasing anthropogenic forcing (Stocker et al., 2013), particularly in the Arctic (Pithan & Mauritsen, 2014). In cold seasons (winter and spring), however, land temperatures for large areas of northern mid-latitudes have experienced almost no warming or cooling trends during the same period (especially 1990J. Cohen et al., 2020) with frequent cold extremes, which is in sharp contrast to amplified Arctic warming (e.g.,

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Multi-proxy reconstructions of paleotemperature in the southern South China Sea since the last deglaciation

Tian,

Yang,

et al. 2024

Global and Planetary Change

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U38MEK′ Expands the linear dynamic range of the alkenone sea surface temperature proxy

Cited by 10 publications

References 95 publications

A Comparison Study of Mg/Ca‐, Alkenone‐, and TEX₈₆‐Derived Temperatures for the Brazilian Margin

A Comparison Study of Mg/Ca‐, Alkenone‐, and TEX₈₆‐Derived Temperatures for the Brazilian Margin

Pre‐Industrial (1750–1850 CE) Cold Season Warmth in Northeastern China

Multi-proxy reconstructions of paleotemperature in the southern South China Sea since the last deglaciation

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U38MEK′ Expands the linear dynamic range of the alkenone sea surface temperature proxy

Cited by 10 publications

References 95 publications

A Comparison Study of Mg/Ca‐, Alkenone‐, and TEX86‐Derived Temperatures for the Brazilian Margin

A Comparison Study of Mg/Ca‐, Alkenone‐, and TEX86‐Derived Temperatures for the Brazilian Margin

Pre‐Industrial (1750–1850 CE) Cold Season Warmth in Northeastern China

Multi-proxy reconstructions of paleotemperature in the southern South China Sea since the last deglaciation

Contact Info

Product

Resources

About

A Comparison Study of Mg/Ca‐, Alkenone‐, and TEX₈₆‐Derived Temperatures for the Brazilian Margin

A Comparison Study of Mg/Ca‐, Alkenone‐, and TEX₈₆‐Derived Temperatures for the Brazilian Margin