Temperature dependency of long-chain alkenone distributions in recent to fossil limnic sediments and in lake waters

Zink, Klaus-Gerhard; Leythaeuser, D.; Melkonian, Michael; Schwark, Lorenz

doi:10.1016/s0016-7037(00)00509-3

Cited by 137 publications

(142 citation statements)

References 43 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: 93%

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: 93%

Solar influenced late Holocene temperature changes on the northern Tibetan Plateau

Liu

Zhao

et al. 2013

Chin. Sci. Bull.

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“…In ocean and other lakes, U 37 k 0 is negatively correlated with %C 37:4 [Sicre et al, 2002;Thiel et al, 1997;Zink et al, 2001] However, in Lake Qinghai, U 37 k 0 is positively correlated with %C 37:4 . In other words, the relative importance of C 37:4 to C 37:3 increases or decreases Figure 1.…”

Section: Alkenone Distribution In Lake Qinghaimentioning

confidence: 91%

“…[11] We applied two calibrations [Chu et al, 2005;Zink et al, 2001] in Chinese lakes (including Lake Qinghai) to mean annual air temperature (MAAT). A MAAT change of up to 1°C in this region during the late Holocene could be inferred using this calibration (Figure 3c).…”

Section: Surface Temperature Changesmentioning

confidence: 99%

“…Alkenones are biologically produced by a limited number of haptophytes present in ocean and some lakes [D'Andrea and Huang, 2005;Li et al, 1996;Marlowe et al, 1990;Thiel et al, 1997;Zink et al, 2001] [C 37:4 ] are concentrations of di-, tri-and tetra-unsaturated C 37 alkenones) [Brassell et al, 1986] [Prahl et al, 1988]. This index has also been calibrated to temperature changes in lacustine settings on a regional scale [Chu et al, 2005;Zink et al, 2001]. In addition to temperature dependence, the percentage of C 37:4 (%C 37:4 = [C 37:4 ]/([C 37:2 ] + [C 37:3 ] + [C 37:4 ])) has recently been proposed as an indicator of salinity changes, since alkenone producers tend to produce more C 37:4 in cold and low salinity regions [Rosell-Mele, 1998].…”

Section: Introductionmentioning

confidence: 99%

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Alkenone‐based reconstruction of late‐Holocene surface temperature and salinity changes in Lake Qinghai, China

Liu

Henderson

Huang

2006

Geophysical Research Letters

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Liu, Z.H., Henderson, A.C.G., Huang, Y.S. (2006). Alkenone-based reconstruction of late-Holocene surface temperature and salinity changes in Lake Qinghai, China (vol 33, art no L09707, 2006). Geophysical Research Letters, 33 Sponsorship: NSF grants to Y.H. (ESH-0318050 and OPP-0520718).Few proxies can provide quantitative reconstructions of past continental climatic and hydrological changes. Here, we report the first alkenone-based reconstruction of late Holocene temperature and salinity changes in Lake Qinghai, China. The alkenone-temperature proxy (Uk0 37) indicates up to a 1 C change in mean annual air temperature or a 2 C change in summer lake water temperature during the late Holocene. Oscillating warm and cold periods could be related to the 20th century warm period, the Little Ice Age, the Medieval Warm Period, the Dark Ages Cold Period, and the Roman Warm Period. The relative importance of C37:4 alkenone to total C37 alkenone production (%C37:4) fluctuated between 15?45%, with higher values during warm periods, suggesting that lake water was also fresher during these periods. The coupled late Holocene surface temperature and salinity changes suggest that Asian monsoons strongly influenced the climate of the Lake Qinghai region.Peer reviewe

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“…Zink et al, 2001), yet the biological origin of the alkenones in these systems remains elusive (e.g. Zink et al, 2001;Lopez et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Unusual C35 to C38 alkenones in mid-Holocene sediments from a restricted estuary (Charlotte Harbor, Florida)

Soelen

Lammers

Eglinton

et al. 2014

Organic Geochemistry

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Unusual C 35 to C 38 alkenones were identified in mid-Holocene (8-3.5 kyr BP) sediments from a restricted estuary in southwest Florida (Charlotte Harbor). The distribution was dominated by a C 36 diunsaturated (ω15,20) ethyl ketone, identical to the one present in Black Sea Unit 2 sediments. Other unusual alkenones were tentatively assigned as a C 35:2 (ω 15,20) methyl ketone, a C 37:2 (ω 17,22) methyl ketone and a C 38:2 (ω 17,22) ethyl ketone. In late Holocene sediments < 3.5 kyr BP, the common C 37 to C 39 alkenones were found. Compound-specific 14 C, 13 C, and D isotope measurements were used to constrain the possible origin of the alkenones. Conventional radiocarbon ages of alkenones and higher plant-derived long chain n-alcohols indicated no significant difference in age between mid-Holocene alkenones and higher plant n-alcohols. Both alcohols and alkenones were offset vs. calibrated ages of shell fragments in the same sediment core, which suggests they were pre-aged by 500-800 yr, implying resuspension and redistribution of the fine-grained sedimentary particles with which they are associated. The hydrogen isotopic (δD) composition (-190‰ to -200‰) of the C 37 and C 38 alkenones in the late Holocene sediments is in line with values for coastal haptophytes in brackish water. However, the unusual C 36 and C 38 alkenones from the mid Holocene sediments were enriched in D (by ca. 100‰) vs. the late Holocene alkenones. Also, δ 13 C values of mid-Holocene alkenones were consistently offset compared with late Holocene alkenones (-21‰ to -22‰ and -22‰ to -23‰, respectively). We suggest that the alkenones in Charlotte Harbor were produced by unknown alkenone-producing haptophyte.

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Temperature dependency of long-chain alkenone distributions in recent to fossil limnic sediments and in lake waters

Cited by 137 publications

References 43 publications

Solar influenced late Holocene temperature changes on the northern Tibetan Plateau

Solar influenced late Holocene temperature changes on the northern Tibetan Plateau

Alkenone‐based reconstruction of late‐Holocene surface temperature and salinity changes in Lake Qinghai, China

Unusual C35 to C38 alkenones in mid-Holocene sediments from a restricted estuary (Charlotte Harbor, Florida)

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