Past climate variations recorded in needle-like aragonites correlate with organic carbon burial efficiency as revealed by lake sediments in Croatia

Abstract The drivers of organic carbon (OC) burial efficiency are still poorly understood despite their key role in reliable projections of future climate trends. Here, we provide insights on this issue by presenting a paleoclimate time series of sediments, including the OC contents, from Lake Velik...

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Autores principales:	Ivan Razum, Petra Bajo, Dea Brunović, Nikolina Ilijanić, Ozren Hasan, Ursula Röhl, Martina Šparica Miko, Slobodan Miko
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b8f1eb91100f4dcea5a750296e4a118e
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spelling	oai:doaj.org-article:b8f1eb91100f4dcea5a750296e4a118e2021-12-02T14:37:46ZPast climate variations recorded in needle-like aragonites correlate with organic carbon burial efficiency as revealed by lake sediments in Croatia10.1038/s41598-021-87166-22045-2322https://doaj.org/article/b8f1eb91100f4dcea5a750296e4a118e2021-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-87166-2https://doaj.org/toc/2045-2322Abstract The drivers of organic carbon (OC) burial efficiency are still poorly understood despite their key role in reliable projections of future climate trends. Here, we provide insights on this issue by presenting a paleoclimate time series of sediments, including the OC contents, from Lake Veliko jezero, Croatia. The Sr/Ca ratios of the bulk sediment are mainly derived from the strontium (Sr) and calcium (Ca) concentrations of needle-like aragonite in Core M1-A and used as paleotemperature and paleohydrology indicators. Four major and six minor cold and dry events were detected in the interval from 8.3 to 2.6 calibrated kilo anno before present (cal ka BP). The combined assessment of Sr/Ca ratios, OC content, carbon/nitrogen (C/N) ratios, stable carbon isotope (δ13C) ratios, and modeled geochemical proxies for paleoredox conditions and aeolian input revealed that cold and dry climate states promoted anoxic conditions in the lake, thereby enhancing organic matter preservation and increasing the OC burial efficiency. Our study shows that the projected future increase in temperature might play an important role in the OC burial efficiency of meromictic lakes.Ivan RazumPetra BajoDea BrunovićNikolina IlijanićOzren HasanUrsula RöhlMartina Šparica MikoSlobodan MikoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Ivan Razum Petra Bajo Dea Brunović Nikolina Ilijanić Ozren Hasan Ursula Röhl Martina Šparica Miko Slobodan Miko Past climate variations recorded in needle-like aragonites correlate with organic carbon burial efficiency as revealed by lake sediments in Croatia
description	Abstract The drivers of organic carbon (OC) burial efficiency are still poorly understood despite their key role in reliable projections of future climate trends. Here, we provide insights on this issue by presenting a paleoclimate time series of sediments, including the OC contents, from Lake Veliko jezero, Croatia. The Sr/Ca ratios of the bulk sediment are mainly derived from the strontium (Sr) and calcium (Ca) concentrations of needle-like aragonite in Core M1-A and used as paleotemperature and paleohydrology indicators. Four major and six minor cold and dry events were detected in the interval from 8.3 to 2.6 calibrated kilo anno before present (cal ka BP). The combined assessment of Sr/Ca ratios, OC content, carbon/nitrogen (C/N) ratios, stable carbon isotope (δ13C) ratios, and modeled geochemical proxies for paleoredox conditions and aeolian input revealed that cold and dry climate states promoted anoxic conditions in the lake, thereby enhancing organic matter preservation and increasing the OC burial efficiency. Our study shows that the projected future increase in temperature might play an important role in the OC burial efficiency of meromictic lakes.
format	article
author	Ivan Razum Petra Bajo Dea Brunović Nikolina Ilijanić Ozren Hasan Ursula Röhl Martina Šparica Miko Slobodan Miko
author_facet	Ivan Razum Petra Bajo Dea Brunović Nikolina Ilijanić Ozren Hasan Ursula Röhl Martina Šparica Miko Slobodan Miko
author_sort	Ivan Razum
title	Past climate variations recorded in needle-like aragonites correlate with organic carbon burial efficiency as revealed by lake sediments in Croatia
title_short	Past climate variations recorded in needle-like aragonites correlate with organic carbon burial efficiency as revealed by lake sediments in Croatia
title_full	Past climate variations recorded in needle-like aragonites correlate with organic carbon burial efficiency as revealed by lake sediments in Croatia
title_fullStr	Past climate variations recorded in needle-like aragonites correlate with organic carbon burial efficiency as revealed by lake sediments in Croatia
title_full_unstemmed	Past climate variations recorded in needle-like aragonites correlate with organic carbon burial efficiency as revealed by lake sediments in Croatia
title_sort	past climate variations recorded in needle-like aragonites correlate with organic carbon burial efficiency as revealed by lake sediments in croatia
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/b8f1eb91100f4dcea5a750296e4a118e
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Past climate variations recorded in needle-like aragonites correlate with organic carbon burial efficiency as revealed by lake sediments in Croatia

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