Porewater salinity reveals past lake-level changes in Lake Van, the Earth’s largest soda lake

Abstract In closed-basin lakes, sediment porewater salinity can potentially be used as a conservative tracer to reconstruct past fluctuations in lake level. However, until now, porewater salinity profiles did not allow quantitative estimates of past lake-level changes because, in contrast to the oce...

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Autores principales:	Yama Tomonaga, Matthias S. Brennwald, David M. Livingstone, Olga Kwiecien, Marie-Ève Randlett, Mona Stockhecke, Katie Unwin, Flavio S. Anselmetti, Jürg Beer, Gerald H. Haug, Carsten J. Schubert, Mike Sturm, Rolf Kipfer
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0269dcdbf63042ee9cdec61bebba4510
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spelling	oai:doaj.org-article:0269dcdbf63042ee9cdec61bebba45102021-12-02T12:30:18ZPorewater salinity reveals past lake-level changes in Lake Van, the Earth’s largest soda lake10.1038/s41598-017-00371-w2045-2322https://doaj.org/article/0269dcdbf63042ee9cdec61bebba45102017-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-00371-whttps://doaj.org/toc/2045-2322Abstract In closed-basin lakes, sediment porewater salinity can potentially be used as a conservative tracer to reconstruct past fluctuations in lake level. However, until now, porewater salinity profiles did not allow quantitative estimates of past lake-level changes because, in contrast to the oceans, significant salinity changes (e.g., local concentration minima and maxima) had never been observed in lacustrine sediments. Here we show that the salinity measured in the sediment pore water of Lake Van (Turkey) allows straightforward reconstruction of two major transgressions and a major regression that occurred during the last 250 ka. We observed strong changes in the vertical salinity profiles of the pore water of the uppermost 100 m of the sediments in Lake Van. As the salinity balance of Lake Van is almost at steady-state, these salinity changes indicate major lake-level changes in the past. In line with previous studies on lake terraces and with seismic and sedimentological surveys, we identify two major transgressions of up to +105 m with respect to the current lake level at about 135 ka BP and 248 ka BP starting at the onset of the two previous interglacials (MIS5e and MIS7), and a major regression of about −200 m at about 30 ka BP during the last ice age.Yama TomonagaMatthias S. BrennwaldDavid M. LivingstoneOlga KwiecienMarie-Ève RandlettMona StockheckeKatie UnwinFlavio S. AnselmettiJürg BeerGerald H. HaugCarsten J. SchubertMike SturmRolf KipferNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yama Tomonaga Matthias S. Brennwald David M. Livingstone Olga Kwiecien Marie-Ève Randlett Mona Stockhecke Katie Unwin Flavio S. Anselmetti Jürg Beer Gerald H. Haug Carsten J. Schubert Mike Sturm Rolf Kipfer Porewater salinity reveals past lake-level changes in Lake Van, the Earth’s largest soda lake
description	Abstract In closed-basin lakes, sediment porewater salinity can potentially be used as a conservative tracer to reconstruct past fluctuations in lake level. However, until now, porewater salinity profiles did not allow quantitative estimates of past lake-level changes because, in contrast to the oceans, significant salinity changes (e.g., local concentration minima and maxima) had never been observed in lacustrine sediments. Here we show that the salinity measured in the sediment pore water of Lake Van (Turkey) allows straightforward reconstruction of two major transgressions and a major regression that occurred during the last 250 ka. We observed strong changes in the vertical salinity profiles of the pore water of the uppermost 100 m of the sediments in Lake Van. As the salinity balance of Lake Van is almost at steady-state, these salinity changes indicate major lake-level changes in the past. In line with previous studies on lake terraces and with seismic and sedimentological surveys, we identify two major transgressions of up to +105 m with respect to the current lake level at about 135 ka BP and 248 ka BP starting at the onset of the two previous interglacials (MIS5e and MIS7), and a major regression of about −200 m at about 30 ka BP during the last ice age.
format	article
author	Yama Tomonaga Matthias S. Brennwald David M. Livingstone Olga Kwiecien Marie-Ève Randlett Mona Stockhecke Katie Unwin Flavio S. Anselmetti Jürg Beer Gerald H. Haug Carsten J. Schubert Mike Sturm Rolf Kipfer
author_facet	Yama Tomonaga Matthias S. Brennwald David M. Livingstone Olga Kwiecien Marie-Ève Randlett Mona Stockhecke Katie Unwin Flavio S. Anselmetti Jürg Beer Gerald H. Haug Carsten J. Schubert Mike Sturm Rolf Kipfer
author_sort	Yama Tomonaga
title	Porewater salinity reveals past lake-level changes in Lake Van, the Earth’s largest soda lake
title_short	Porewater salinity reveals past lake-level changes in Lake Van, the Earth’s largest soda lake
title_full	Porewater salinity reveals past lake-level changes in Lake Van, the Earth’s largest soda lake
title_fullStr	Porewater salinity reveals past lake-level changes in Lake Van, the Earth’s largest soda lake
title_full_unstemmed	Porewater salinity reveals past lake-level changes in Lake Van, the Earth’s largest soda lake
title_sort	porewater salinity reveals past lake-level changes in lake van, the earth’s largest soda lake
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/0269dcdbf63042ee9cdec61bebba4510
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Porewater salinity reveals past lake-level changes in Lake Van, the Earth’s largest soda lake

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