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Past climate variations recorded in needle-like aragonites correlate with organic carbon burial efficiency as revealed from lake sediments in Croatia
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  • Ivan Razum,
  • Petra Bajo,
  • Dea Brunović,
  • Nikolina Ilijanić,
  • Ozren Hasan,
  • Ursula Röhl,
  • Martina Šparica Miko,
  • Slobodan Miko
Ivan Razum
Croatian Natural History Museum, Croatian Natural History Museum, Croatian Natural History Museum

Corresponding Author:[email protected]

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Petra Bajo
Croatian Geological Survey, Croatian Geological Survey, Croatian Geological Survey
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Dea Brunović
Croatian Geological Survey, Croatian Geological Survey, Croatian Geological Survey
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Nikolina Ilijanić
Croatian Geological Survey, Croatian Geological Survey, Croatian Geological Survey
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Ozren Hasan
Croatian Geological Survey, Croatian Geological Survey, Croatian Geological Survey
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Ursula Röhl
University of Bremen, University of Bremen, University of Bremen
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Martina Šparica Miko
Croatian Geological Survey, Croatian Geological Survey, Croatian Geological Survey
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Slobodan Miko
Croatian Geological Survey, Croatian Geological Survey, Croatian Geological Survey
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Abstract

The drivers of the efficiency in organic carbon (OC) burial are still poorly understood despite their key role in reliable projections of future climate trends. Here we shed new light on this question by presenting paleoclimate time series including OC content in sediments from Lake Veliko jezero, Croatia. The Sr/Ca ratios of the bulk sediment mainly derives from Sr and Ca concentrations of needle like aragonite in Core M1-A and was used as a palaeotemperature and palaeohydrology indicator. Four major and six minor cold and dry events were detected in the 8.3 to 2.6 cal ka BP interval. The combined assessment of Sr/Ca ratios, OC content, C/N ratios, δ13C data, and modelled proxies for palaeoredox conditions and aeolian input reveals that cold and dry climate state promoted anoxic conditions in the lake enhancing preservation of organic matter and leading to increased OC burial efficiency. Our study contributes to that projected future increase of temperature might play an important role in OC burial efficiency of meromictic lakes.