Radiocarbon and optically stimulated luminescence dating of sediments from Lake Karakul, Tajikistan

Mischke, Steffen; Lai, Zhongping; Aichner, Bernhard; Heinecke, Liv; Mahmoudov, Z.; Kuessner, Marie L; Herzschuh, Ulrike

doi:10.1016/j.quageo.2017.05.008

Cited by 21 publications

(28 citation statements)

References 35 publications

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“…AVF maar lakes also preserve complete archives of eruptions of the local basaltic volcanoes as well as rhyolitic and andesitic volcanic systems situated in the Taupo Volcanic Zone (TVZ) and Egmont Volcano (Fig. 1) to the south of Auckland (Hopkins et al, 2015;Molloy et al, 2009;Shane, 2005;Shane and Hoverd, 2002). This is of importance as the City of Auckland, with > 1.5 million inhabitants, is situated on a potentially active volcanic field for which eruption frequencies cannot be derived from the historical record (Edbrooke et al, 2003;Molloy et al, 2009;Newnham et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

“…1) to the south of Auckland (Hopkins et al, 2015;Molloy et al, 2009;Shane, 2005;Shane and Hoverd, 2002). This is of importance as the City of Auckland, with > 1.5 million inhabitants, is situated on a potentially active volcanic field for which eruption frequencies cannot be derived from the historical record (Edbrooke et al, 2003;Molloy et al, 2009;Newnham et al, 1999). Many basaltic tephra layers have been recorded in the AVF maar sediment cores, but age estimates rely on sedimentation rate extrapolation to and correlation with the source volcanoes, which mostly have not been dated unambiguously (Hopkins et al, 2015(Hopkins et al, , 2017Leonard et al, 2017;Lindsay et al, 2011;Molloy et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

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Stratigraphy and sedimentology of the Orakei maar lake sediment sequence (Auckland Volcanic Field, New Zealand)

Peti

Augustinus

2019

Sci. Dril.

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Abstract. Global paleo-climate reconstructions are largely based on observations from the Northern Hemisphere despite increasing recognition of the importance of the Southern Hemisphere mid-latitudes for understanding the drivers of the global climate system. Unfortunately, the required complete and high-resolution terrestrial records from the Southern Hemisphere mid-latitudes are few. However, the maar lakes in the Auckland Volcanic Field (AVF), New Zealand, are crucial in this regard as they form outstanding depositional basins due to their small surface-to-depth ratio, restricted catchment, and absence of ice cover since their formation, hence ensuring continuous sedimentation with anoxic bottom water. Significantly, the estimated age of the AVF of ca. 250 ka may allow development of a continuous sediment record spanning the last two glacial cycles. The Orakei maar lake sediment sequence examined in this study spans the Last Glacial Cycle (ca. 126 to ca. 9.5 ka cal BP) from the phreatomagmatic eruption to the crater rim breach due to post-glacial sea-level rise. Two overlapping cores of >100 m sediment were retrieved and combined to develop a complete composite stratigraphy that is presently undergoing a wide range of multi-proxy analyses.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stratigraphy and sedimentology of the Orakei maar lake sediment sequence (Auckland Volcanic Field, New Zealand)

Peti

Augustinus

2019

Sci. Dril.

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“…(k) Reconstruction of 15 kyr BP lake level highstand (Komatsu & Tsukamoto, ). (l) PCA axis 2, indicating lake level (Heinecke, Mischke, et al, ) based on inorganic proxies measured at core KK12‐1, adjusted to the new composite age‐model for both parallel cores KK12‐1 and ‐2, as published in Mischke et al () . (m, n) Inferred salinity changes based on Sr/Ca ratios and alkenone abundances.…”

Section: Resultsmentioning

confidence: 99%

“…A detailed description of methodology is given in supporting information Text S1. Briefly, a composite age‐model was built for two parallel sediment cores (KK12‐1 and ‐2) taken in 12‐m water depth (39.01760°N and 73.53275°E; Mischke et al, ). For organic geochemical analysis, samples from core KK12‐2 were extracted with an organic solvent and split into fractions by using silica‐gel columns.…”

Section: Methodsmentioning

confidence: 99%

“…Recently, a lacustrine archive with a robust chronology spanning a glacial‐interglacial cycle was obtained from Lake Karakul (Mischke et al, ). Inorganic geochemical data, sedimentological, and paleoecological proxies from this record showed large‐scale shifts, possibly driven by insolation, over the past 28 kyr (Heinecke, Epp, et al, ; Heinecke, Mischke, et al, ; Heinecke et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Hydroclimate in the Pamirs Was Driven by Changes in Precipitation‐Evaporation Seasonality Since the Last Glacial Period

Aichner

Makhmudov²,

Rajabov³

et al. 2019

Geophysical Research Letters

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The Central Asian Pamir Mountains (Pamirs) are a high-altitude region sensitive to climatic change, with only few paleoclimatic records available. To examine the glacial-interglacial hydrological changes in the region, we analyzed the geochemical parameters of a 31-kyr record from Lake Karakul and performed a set of experiments with climate models to interpret the results. δD values of terrestrial biomarkers showed insolation-driven trends reflecting major shifts of water vapor sources. For aquatic biomarkers, positive δD shifts driven by changes in precipitation seasonality were observed at ca. 31-30, 28-26, and 17-14 kyr BP. Multiproxy paleoecological data and modelling results suggest that increased water availability, induced by decreased summer evaporation, triggered higher lake levels during those episodes, possibly synchronous to northern hemispheric rapid climate events. We conclude that seasonal changes in precipitation-evaporation balance significantly influenced the hydrological state of a large waterbody such as Lake Karakul, while annual precipitation amount and inflows remained fairly constant.Plain Language Summary Lakes in arid Central Asia are particularly susceptible to the rise and fall of lake levels as a consequence of climatic changes. To evaluate drivers behind this phenomenon, we developed a record of humidity and lake levels throughout the last 31,000 years from a high-altitude lake in the Pamir Mountains. Herefore, we combined hydrological and ecological reconstructions with climate model experiments. Results show that neither the enhanced inflow by melting glaciers nor the significantly increased precipitation amount was responsible for higher lake levels during the studied interval. Instead, reduced summer evaporation during cold episodes was the major trigger for lake transgressions. These fluctuations were driven by changes in radiative forcing (i.e., insolation and hence temperature change) as a consequence of changes in the Earth's orbit around the Sun. As such, our results suggest that a significant impact on lake levels in arid regions is also to be expected by the current anthropogenically driven global warming.

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Human activity during the late Pleistocene in the Lop Nur region, northwest China: Evidence from a buried stone artifact

Qin

Yang

et al. 2018

Sci. China Earth Sci.

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Radiocarbon and optically stimulated luminescence dating of sediments from Lake Karakul, Tajikistan

Cited by 21 publications

References 35 publications

Stratigraphy and sedimentology of the Orakei maar lake sediment sequence (Auckland Volcanic Field, New Zealand)

Stratigraphy and sedimentology of the Orakei maar lake sediment sequence (Auckland Volcanic Field, New Zealand)

Hydroclimate in the Pamirs Was Driven by Changes in Precipitation‐Evaporation Seasonality Since the Last Glacial Period

Human activity during the late Pleistocene in the Lop Nur region, northwest China: Evidence from a buried stone artifact

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