Precipitation and lake water evaporation recorded by terrestrial and aquatic n-alkane δ2H isotopes in Lake Khar Nuur, Mongolia

Strobel, Paul; Zech, Roland; Struck, Julian; Bazarradnaa, Enkhtuya; Zech, Michael; Bliedtner, Marcel

doi:10.1002/essoar.10507650.1

Cited by 2 publications

(4 citation statements)

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“…(2020), and even suggested for the Khar Nuur catchment from topsoil and surface sediment samples by Strobel, Zech, et al. (2021). In contrast, δ 2 H of the aquatic n ‐C 23 reflects the isotopic signal of the lake water (Sachse et al., 2004), and especially in endorheic semi‐arid lakes, lake water is highly sensitive to changes in precipitation/evaporation.…”

Section: Discussionmentioning

confidence: 80%

“…In contrast, δ 2 H of the aquatic n ‐C 23 reflects the isotopic signal of the lake water (Sachse et al., 2004), and especially in endorheic semi‐arid lakes, lake water is highly sensitive to changes in precipitation/evaporation. Lake water can therefore be strongly modulated by evaporative enrichment, which holds especially true for Lake Khar Nuur, where such a strong evaporative enrichment is shown by surface sediment samples (Strobel, Zech, et al., 2021). Consequently, the difference between the terrestrial and aquatic δ 2 H (Δ aq‐terr ) is a valuable indicator for evaporative enrichment and more arid conditions in semi‐arid lakes and Lake Khar Nuur (Aichner et al., 2019; Mügler et al., 2008; Strobel, Zech, et al., 2021).…”

Section: Discussionmentioning

confidence: 99%

“…Lake water can therefore be strongly modulated by evaporative enrichment, which holds especially true for Lake Khar Nuur, where such a strong evaporative enrichment is shown by surface sediment samples (Strobel, Zech, et al., 2021). Consequently, the difference between the terrestrial and aquatic δ 2 H (Δ aq‐terr ) is a valuable indicator for evaporative enrichment and more arid conditions in semi‐arid lakes and Lake Khar Nuur (Aichner et al., 2019; Mügler et al., 2008; Strobel, Zech, et al., 2021). The Δ aq‐terr is high before ∼3.7 cal.…”

Section: Discussionmentioning

confidence: 99%

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Late Holocene Climate Changes in the Altai Region Based on a First High‐Resolution Biomarker Isotope Record From Lake Khar Nuur

Bliedtner

Struck

Strobel

et al. 2021

Geophysical Research Letters

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The semi-arid regions of the eastern Eurasian Steppe and the Altai Region are highly sensitive towards climate change and are expected to increasingly experience drought conditions by rising temperatures during the next decades (Batima et al., 2005;Dai, 2011). This sensitivity is mostly due to its continentality and complex climate forcing by the interplay of several large-scale atmospheric circulation patterns affecting moisture advection and precipitation variability (Aizen et al., 2001;D'Arrigo et al., 2000). While the cold and dry winter climate is controlled by the Siberian High, moisture and precipitation is mainly brought by the mid-latitude Westerlies and in the past to some extent by the low-latitude East Asian Summer Monsoon (EASM; Hoerling et al., 2001;Visbeck, 2002). However, the past evolution of those atmospheric circulation systems remains controversial, and little is known about their interactions and how they have affected climate variability in the region. Currently, paleoclimate information from the Altai Region is mainly derived from pollen-based vegetation reconstructions that mostly show more extensive forests and boreal woodlands before ∼4 ka, and the dominance of steppe vegetation thereafter. This is generally interpreted to indicate warmer conditions with increased precipitation before ∼4 ka, followed by colder conditions with decreased precipitation (Blyakharchuk et al., 2007;Brugger et al., 2018;Rudaya et al., 2009). However, the expansion of grasslands and steppes after ∼4 ka BP could also be driven by intensified anthropogenic land-use, which is assumed to start with the introduction of mobile pastoralism from the Western Eurasian

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Section: Discussionmentioning

confidence: 80%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Late Holocene Climate Changes in the Altai Region Based on a First High‐Resolution Biomarker Isotope Record From Lake Khar Nuur

Bliedtner

Struck

Strobel

et al. 2021

Geophysical Research Letters

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“…While the isotope effect of evaporation from leaves and lakes sometimes cancel each other out (Aichner et al., 2010), differences in δ 2 H records of paired biomarkers within a single sediment core are common, supporting the potential of the dual‐biomarker method. Variations of this approach have been used to reconstruct humidity in Greenland (Balascio et al., 2013; Thomas et al., 2018; Zhao et al., 2022) and the Svalbard Archipelago (Balascio et al., 2018; Kjellman et al., 2020), as well as in several mid‐ and low‐latitude sites (Jacob et al., 2007; Mügler et al., 2008; Rach et al., 2014; Seki et al., 2011; Strobel et al., 2022; Toney et al., 2020). This dual‐biomarker method and its assumption are described in detail by Rach et al.…”

Section: Dual‐biomarker Isotope Paleohydrologymentioning

confidence: 99%

In the Weeds: Aquatic Plant Biomarker Sources to Arctic Lake Sediments

Daniels

2022

JGR Biogeosciences

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In reconstructing past changes in precipitation or evaporation from the geologic record, paleoclimatologists sometimes employ the dual‐biomarker isotope method. This method requires that two co‐occurring sedimentary lipids are derived from different biological sources, and that their compound‐specific 2H/1H ratios record different aspects of the hydrologic cycle. Several studies have used this approach, typically by comparing the 2H/1H ratios of n‐alkyl lipids (δ2Hwax) thought to be sourced from aquatic versus terrestrial plants that gain their hydrogen atoms from lake water and soil water, respectively. Yet confidently fingerprinting n‐alkyl lipid sources continues to be a challenge because the wax inputs of different plant types vary across biomes, lake types, and time. New research in the Journal of Geophysical Research‐Biogeosciences by Hollister et al. (2022, https://doi.org/10.1029/2022jg006903) utilizes a combination of three independent metrics to demonstrate that for Arctic lakes, mid‐chain n‐alkanoic acids can be sourced principally from aquatic plants whereas long‐chain n‐alkanoic acids derive from a mixture of aquatic and terrestrial plants. By cataloging wax compound distributions and compound‐specific H and C isotopes of many new plant species, their efforts will strengthen future biomarker paleoclimatology and reinforce previous applications of the dual‐biomarker approach in high‐latitude lakes. The identification of a lake system with a strong aquatic plant wax signal in the sediments should motivate future targeting of similar lakes for reconstructing past moisture with the dual‐biomarker method.

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Precipitation and lake water evaporation recorded by terrestrial and aquatic n-alkane δ2H isotopes in Lake Khar Nuur, Mongolia

Cited by 2 publications

References 28 publications

Late Holocene Climate Changes in the Altai Region Based on a First High‐Resolution Biomarker Isotope Record From Lake Khar Nuur

Late Holocene Climate Changes in the Altai Region Based on a First High‐Resolution Biomarker Isotope Record From Lake Khar Nuur

In the Weeds: Aquatic Plant Biomarker Sources to Arctic Lake Sediments

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