Salinity control on long-chain alkenone distributions in lake surface waters and sediments of the northern Qinghai-Tibetan Plateau, China

Liu, Weiguo; Liu, Zhonghui; Wang, Huanye; He, Yuxin; Wang, Zheng; Xu, Liming

doi:10.1016/j.gca.2010.10.029

Cited by 74 publications

(44 citation statements)

References 48 publications

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“…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%

“…Alkenone analyses followed the standard procedure by Liu et al [30]. The total lipids were obtained through extraction of freeze-dried sediments (~2-6 g) with organic solvents, hydrolyzed to remove alkenoates that could interfere with the identification of alkenones, and then separated into three fractions with silica gel column chromatography.…”

Section: Sampling Sites and Methodsmentioning

confidence: 99%

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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: Discussionmentioning

confidence: 96%

Section: Sampling Sites and Methodsmentioning

confidence: 99%

Solar influenced late Holocene temperature changes on the northern Tibetan Plateau

Liu

Zhao

et al. 2013

Chin. Sci. Bull.

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“…1 Although some of the terrestrial organic materials are likely to be present in the shelf sediments based on the C/N ratio, no peaks reflecting terrestrial influences interfered with the C 37 alkenone peaks on the chromatogram. Alkenone is a biomarker not only of marine haptophyte algae [Marlowe et al, 1984;Volkman et al, 1980] but also of lacustrine haptophyte algae from saline and alkaline lakes on the Asian and North American continents [Liu et al, 2011;Toney et al, 2010]. The alkenone concentration of the suspended particles in water samples collected from a location (63 30′N, 165 30′W close to the mouth of the Yukon River was under the detection limit [Harada et al, 2003], which suggests that it is unlikely that alkenone originating from terrestrial lakes contaminated our samples.…”

Section: Analysis Of Organic Carbon Total Nitrogen and Alkenonementioning

confidence: 91%

Enhancement of coccolithophorid blooms in the Bering Sea by recent environmental changes

Harada

Sato

Oguri

et al. 2012

Global Biogeochemical Cycles

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[1] Since 1997, ocean color satellite images have revealed large-scale blooms of the coccolithophorid Emiliania huxleyi in the eastern Bering Sea. The blooms are often sustained over several months and have caused ecosystem changes in the Arctic Ocean, as well as in the Bering Sea. We examined continental shelf sediment profiles of alkenone, a biomarker for E. huxleyi, covering the past $70 years. The alkenone records suggest that large E. huxleyi blooms are a novel feature in the Bering Sea as they have occurred only since the late 1970s. Recent changes in alkenone content were closely related to the 1976-77 climatic regime shift in the North Pacific, implying that warming and freshening of Bering Sea waters promoted E. huxleyi blooms. The production rate of diatoms (total valves in sediment samples), the dominant primary producers in the Bering Sea, also increased during the past several decades. However, the ratio of alkenone content to total diatom valves in the sediments increased as E. huxleyi production increased, suggesting that the increase in the E. huxleyi production rate frequently exceeded the increase in the diatom production rate. Overall, our results indicate a possible subarctic region ecosystem shift driven by climate change.

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“…index calculation depends mainly on the abundance of the C 37:4 alkenone. Because of the effects of salinity, a higher percentage of C 37:4 appeared in lakes with a low salinity, and vice versa [17,21,38,39]. Therefore, the U 3 K 7 index may be sensitive to variations in salinity, especially in the more saline lakes.…”

Section: Kmentioning

confidence: 99%

“…However, the potential LCA-producing algae in the studied lakes may differ significantly because of variations in the salinity [15]. Liu et al [17,21] found that the proportion of tetra-unsaturated ketones (%C 37:4 ) was controlled by the water salinity and suggested that the U 3 K 7 ′ index was a more appropriate temperature proxy for lakes in the northern Qinghai-Tibetan Plateau. As in-situ water filters or culture temperature relationships for this region had not been reported, previous temperature reconstructions using LCAs in the Tibetan Plateau had to use calibration results from other sites [29], although it was not clear whether they were suitable for this study area.…”

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confidence: 98%

Calibration of the U 37 K′ index of long-chain alkenones with the in-situ water temperature in Lake Qinghai in the Tibetan Plateau

Wang

Liu

2012

Chin. Sci. Bull.

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Long-chain alkenones (LCAs) can potentially be used as indicators to understand past variations in lacustrine environments. Previous research has suggested that the relationship between the temperature and the unsaturation index of LCAs should be calibrated individually, because of the possible variations in the alkenone-producing algal species in the lacustrine environment. In this work, we have calibrated U 3 K 7 ′ of water filter samples against the in-situ water temperature in Lake Qinghai, Tibetan Plateau. There are significant relationships between U 3 K 7 ′ and the water temperature, a non-linear relationship was derived. Because the U 3 ′ index of long-chain alkenones with the in-situ water temperature in

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Salinity control on long-chain alkenone distributions in lake surface waters and sediments of the northern Qinghai-Tibetan Plateau, China

Cited by 74 publications

References 48 publications

Solar influenced late Holocene temperature changes on the northern Tibetan Plateau

Solar influenced late Holocene temperature changes on the northern Tibetan Plateau

Enhancement of coccolithophorid blooms in the Bering Sea by recent environmental changes

Calibration of the U 37 K′ index of long-chain alkenones with the in-situ water temperature in Lake Qinghai in the Tibetan Plateau

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