Calibration of alkenone unsaturation index with growth temperature for a lacustrine species, Chrysotila lamellosa (Haptophyceae)

Sun, Qing; Chu, Guoqiang; Liu, Guoxiang; Li, Song; Wang, Xiaohua

doi:10.1016/j.orggeochem.2007.04.007

Cited by 86 publications

(92 citation statements)

References 65 publications

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“…U 3 k′ 7 values range from 0.08 to 0.25 in Lake Sugan and from 0.04 to 0.20 in Lake Gahai respectively (Figure 3(a), (b)), equivalent to variations in lake surface water temperature of up to 6°C, based on the culture calibration equation [32] (U 3 k′ 7 = 0.026T-0.261). With such substantial variability, relative warm/cold periods can be clearly identified, including the current warm period after AD 1850, the LIA between AD 1350-1850, the MWP between AD 700-1350, the Dark Ages Cold Period between AD 50-700 [33], and the warm period before AD 50 based on the Lake Gahai record (Figure 3(b)).…”

Section: Resultsmentioning

confidence: 99%

“…Over the past two decades, the U 3 k′ 7 proxy has been widely used to quantitatively reconstruct sea surface temperature changes on various timescales, and proved to be one of the best temperature proxies to date. Although largely applied in marine settings previously, its capability for temperature reconstructions from lake sediments has been indicated by recent studies [30,32,34,[37][38][39][40][41][42][43][44][45]. Chu et al [37] In this study, we interpret U 3 k′ 7 reflecting summer lake surface temperature, using the culture calibration from Sun et al [32].…”

Section: Discussionmentioning

confidence: 96%

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Solar influenced late Holocene temperature changes on the northern Tibetan Plateau

Liu

Zhao

et al. 2013

Chin. Sci. Bull.

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Considerable efforts have been made to extend temperature records beyond the instrumental period through proxy reconstructions, in order to further understand the mechanisms of past climate variability. Yet, the global coverage of existing temperature records is still limited, especially for some key regions like the Tibetan Plateau and for earlier times including the Medieval Warm Period (MWP). Here we present decadally-resolved, alkenone-based, temperature records from two lakes on the northern Tibetan Plateau. Characterized by marked temperature variability, our records provide evidence that temperatures during the MWP were slightly higher than the modern period in this region. Further, our temperature reconstructions, within age uncertainty, can be well correlated with solar irradiance changes, suggesting a possible link between solar forcing and natural climate variability, at least on the northern Tibetan Plateau.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 96%

Solar influenced late Holocene temperature changes on the northern Tibetan Plateau

Liu

Zhao

et al. 2013

Chin. Sci. Bull.

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“…All these factors potentially exceed the effects of salinity and may impede the use of δD C 37 as a palaeosalinity proxy. Nevertheless, palaeoclimate studies have made successful use of δD C 37 as a palaeosalinity proxy (van der Meer et al, 2007(van der Meer et al, , 2008Giosan et al, 2012;Schmidt et al, 2014;Pahnke et al, 2007). However, in some cases, factors like species' variability complicated δD C 37 -based salinity reconstructions (Kasper et al, 2015).…”

Section: Häggi Et Al: Testing the D / H Ratio Of Alkenones And Pamentioning

confidence: 99%

“…H + 3 factors varied between 5.6 and 6.2, while the mean absolute deviation of external standards was 2.2 ‰. In order to prevent a bias introduced by variable alkenone distribution, the δD of alkenones was analysed for C 37 : 2 and C 37 : 3 together rather than separately (van der Meer et al, 2013). δD values for palmitic acid were corrected for the methyl group added during methylation.…”

Section: Häggi Et Al: Testing the D / H Ratio Of Alkenones And Pamentioning

confidence: 99%

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Testing the D / H ratio of alkenones and palmitic acid as salinity proxies in the Amazon Plume

Häggi

Chiessi²,

Schefuß

2015

Biogeosciences

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Abstract. The stable hydrogen isotope composition of lipid biomarkers, such as alkenones, is a promising new tool for the improvement of palaeosalinity reconstructions. Laboratory studies confirmed the correlation between lipid biomarker δD composition (δD Lipid ), water δD composition (δD H 2 O ) and salinity; yet there is limited insight into the applicability of this proxy in oceanic environments. To fill this gap, we test the use of the δD composition of alkenones (δD C 37 ) and palmitic acid (δD PA ) as salinity proxies using samples of surface suspended material along the distinct salinity gradient induced by the Amazon Plume. Our results indicate a positive correlation between salinity and δD H 2 O , while the relationship between δD H 2 O and δD Lipid is more complex: δD PA correlates strongly with δD H 2 O (r 2 = 0.81) and shows a salinity-dependent isotopic fractionation factor. δD C 37 only correlates with δD H 2 O in a small number (n = 8) of samples with alkenone concentrations > 10 ng L −1 , while there is no correlation if all samples are taken into account. These findings are mirrored by alkenone-based temperature reconstructions, which are inaccurate for samples with low alkenone concentrations. Deviations in δD C 37 and temperature are likely to be caused by limited haptophyte algae growth due to low salinity and light limitation imposed by the Amazon Plume. Our study confirms the applicability of δD Lipid as a salinity proxy in oceanic environments. But it raises a note of caution concerning regions where low alkenone production can be expected due to low salinity and light limitation, for instance, under strong riverine discharge.

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Successional blooms of alkenone‐producing haptophytes in Lake George, North Dakota: Implications for continental paleoclimate reconstructions

Theroux

Huang

Toney

et al. 2019

Limnology & Oceanography

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Alkenone‐derived paleotemperature reconstruction holds great promise in lake environments. However, the occurrence of multiple species of alkenone‐producing haptophyte algae in a single lake can complicate the translation of alkenone unsaturation to temperature if each species requires an individual temperature calibration. Here, we present the first systematic monitoring of two alkenone‐producing haptophytes throughout the course of a seasonal cycle in Lake George, North Dakota, using a combined approach of DNA sequencing and alkenone lipid characterization. Field sampling revealed a nonoverlapping haptophyte succession, with both an early and late season haptophyte bloom event. Culturing experiments demonstrated that the two haptophyte species responsible for these blooms had statistically similar alkenone‐temperature responses, although the culture‐based calibrations were distinct from the in situ calibration. Bloom timing of each haptophyte species corresponded to surface‐water temperatures that differed by more than 10°C, revealing that changes in bloom intensities for each species will skew the sediment‐inferred temperatures to a different stage of the growth season. These results highlight the importance of accounting for bloom timing when interpreting alkenone‐derived temperatures in sediment cores, especially in lakes that experience large seasonal fluctuations in water column temperature and salinity.

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Calibration of alkenone unsaturation index with growth temperature for a lacustrine species, Chrysotila lamellosa (Haptophyceae)

Cited by 86 publications

References 65 publications

Solar influenced late Holocene temperature changes on the northern Tibetan Plateau

Solar influenced late Holocene temperature changes on the northern Tibetan Plateau

Testing the D / H ratio of alkenones and palmitic acid as salinity proxies in the Amazon Plume

Successional blooms of alkenone‐producing haptophytes in Lake George, North Dakota: Implications for continental paleoclimate reconstructions

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