scholarly journals Climate influence on organic carbon burial efficiency as revealed from a multi-proxy lake sediment record in Croatia

2020 ◽  
Author(s):  
Ivan Razum ◽  
Petra Bajo ◽  
Dea Brunović ◽  
Nikolina Ilijanić ◽  
Ozren Hasan ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Lake Sediment ◽  
Sediment Record ◽  
Carbon Burial ◽  
Organic Carbon Burial ◽  
Burial Efficiency

scholarly journals Climate influence on organic carbon burial efficiency as revealed from a multi-proxy lake sediment record in Croatia

2020 ◽  
Author(s):  
Ivan Razum ◽  
Petra Bajo ◽  
Dea Brunović ◽  
Nikolina Ilijanić ◽  
Ozren Hasan ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Lake Sediment ◽  
Sediment Record ◽  
Carbon Burial ◽  
Organic Carbon Burial ◽  
Burial Efficiency

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

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ivan Razum ◽  
Petra Bajo ◽  
Dea Brunović ◽  
Nikolina Ilijanić ◽  
Ozren Hasan ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Stable Carbon Isotope ◽  
Climate Variations ◽  
Before Present ◽  
Stable Carbon ◽  
Climate Trends ◽  
Geochemical Proxies ◽  
Carbon Burial ◽  
Organic Carbon Burial ◽  
Burial Efficiency

AbstractThe 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.

scholarly journals Low organic carbon burial efficiency in arctic lake sediments

2014 ◽  
Vol 119 (6) ◽  
pp. 1231-1243 ◽  
Author(s):  
S. Sobek ◽  
N. J. Anderson ◽  
S. M. Bernasconi ◽  
T. Del Sontro
Keyword(s):  
Organic Carbon ◽  
Lake Sediments ◽  
Arctic Lake ◽  
Carbon Burial ◽  
Organic Carbon Burial ◽  
Burial Efficiency

scholarly journals The historical dependency of organic carbon burial efficiency

2017 ◽  
Vol 62 (4) ◽  
pp. 1480-1497 ◽  
Author(s):  
Alan D. Radbourne ◽  
David B. Ryves ◽  
N. John Anderson ◽  
Daniel R. Scott
Keyword(s):  
Organic Carbon ◽  
Carbon Burial ◽  
Organic Carbon Burial ◽  
Burial Efficiency

scholarly journals Organic carbon burial efficiency in lake sediments controlled by oxygen exposure time and sediment source

2009 ◽  
Vol 54 (6) ◽  
pp. 2243-2254 ◽  
Author(s):  
Sebastian Sobek ◽  
Edith Durisch-Kaiser ◽  
Roland Zurbrügg ◽  
Nuttakan Wongfun ◽  
Martin Wessels ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Lake Sediments ◽  
Exposure Time ◽  
Sediment Source ◽  
Oxygen Exposure ◽  
Carbon Burial ◽  
Organic Carbon Burial ◽  
Burial Efficiency

scholarly journals Efficient preservation of young terrestrial organic carbon in sandy turbidity-current deposits

Geology ◽  
2020 ◽  
Vol 48 (9) ◽  
pp. 882-887
Author(s):  
S. Hage ◽  
V.V. Galy ◽  
M.J.B. Cartigny ◽  
S. Acikalin ◽  
M.A. Clare ◽  
...  
Keyword(s):  
Organic Carbon ◽  
River Sediment ◽  
Woody Debris ◽  
Turbidity Current ◽  
Turbidity Currents ◽  
Geologic Time ◽  
Carbon Burial ◽  
Organic Carbon Burial ◽  
Using Data ◽  
Burial Efficiency

Abstract Burial of terrestrial biospheric particulate organic carbon in marine sediments removes CO2 from the atmosphere, regulating climate over geologic time scales. Rivers deliver terrestrial organic carbon to the sea, while turbidity currents transport river sediment further offshore. Previous studies have suggested that most organic carbon resides in muddy marine sediment. However, turbidity currents can carry a significant component of coarser sediment, which is commonly assumed to be organic carbon poor. Here, using data from a Canadian fjord, we show that young woody debris can be rapidly buried in sandy layers of turbidity current deposits (turbidites). These layers have organic carbon contents 10× higher than the overlying mud layer, and overall, woody debris makes up >70% of the organic carbon preserved in the deposits. Burial of woody debris in sands overlain by mud caps reduces their exposure to oxygen, increasing organic carbon burial efficiency. Sandy turbidity current channels are common in fjords and the deep sea; hence we suggest that previous global organic carbon burial budgets may have been underestimated.

scholarly journals Organic carbon burial efficiency in a subtropical hydroelectric reservoir

2016 ◽  
Vol 13 (11) ◽  
pp. 3331-3342 ◽  
Author(s):  
Raquel Mendonça ◽  
Sarian Kosten ◽  
Sebastian Sobek ◽  
Simone Jaqueline Cardoso ◽  
Marcos Paulo Figueiredo-Barros ◽  
...  
Keyword(s):  
Organic Carbon ◽  
High Efficiency ◽  
Accumulation Rate ◽  
Sediment Accumulation ◽  
Low Oxygen ◽  
Spatially Resolved ◽  
Natural Lakes ◽  
Carbon Burial ◽  
Organic Carbon Burial ◽  
Burial Efficiency

Abstract. Hydroelectric reservoirs bury significant amounts of organic carbon (OC) in their sediments. Many reservoirs are characterized by high sedimentation rates, low oxygen concentrations in bottom water and a high share of terrestrially derived OC, and all of these factors have been linked to a high efficiency of OC burial. However, investigations of OC burial efficiency (OCBE, i.e., the ratio between buried and deposited OC) in reservoirs are limited to a few studies, none of which include spatially resolved analyses. In this study we determined the spatial variation in OCBE in a large subtropical reservoir and related it to sediment characteristics. Our results show that the sediment accumulation rate explains up to 92 % of the spatial variability in OCBE, outweighing the effect of other variables, such as OC source and oxygen exposure time. OCBE at the pelagic sites varied from 48 to 86 % (mean 67 %) and decreased towards the dam. At the margins, OCBE was lower (9–17 %) due to the low sediment accumulation in shallow areas. Our data show that the variability in OCBE both along the rivers–dam and the margin–pelagic axes must be considered in whole-reservoir assessments. Combining these results with a spatially resolved assessment of sediment accumulation and OC burial in the studied reservoir, we estimated a spatially resolved mean OC burial efficiency of 57 %. Being the first assessment of OCBE with such a high spatial resolution in a reservoir, these results suggest that reservoirs may bury OC more efficiently than natural lakes.

Long-term Aptian marine osmium isotopic record of Ontong Java Nui activity

Geology ◽  
2021 ◽  
Author(s):  
Hironao Matsumoto ◽  
Rodolfo Coccioni ◽  
Fabrizio Frontalini ◽  
Kotaro Shirai ◽  
Luigi Jovane ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Volcanic Eruptions ◽  
Hydrothermal Activity ◽  
Published Data ◽  
Isotopic Data ◽  
Oceanic Plateaus ◽  
Carbon Burial ◽  
Organic Carbon Burial ◽  
Isotopic Records

The early to mid-Aptian was punctuated by episodic phases of organic-carbon burial in various oceanographic settings, which are possibly related to massive volcanism associated with the emplacement of the Ontong Java, Manihiki, and Hikurangi oceanic plateaus in the southwestern Pacific Ocean, inferred to have formed a single plateau called Ontong Java Nui. Sedimentary osmium (Os) isotopic compositions are one of the best proxies for determining the timing of voluminous submarine volcanic episodes. However, available Os isotopic records during the age are limited to a narrow interval in the earliest Aptian, which is insufficient for the reconstruction of long-term hydrothermal activity. We document the early to mid-Aptian Os isotopic record using pelagic Tethyan sediments deposited in the Poggio le Guaine (Umbria-Marche Basin, Italy) to precisely constrain the timing of massive volcanic episodes and to assess their impact on the marine environment. Our new Os isotopic data reveal three shifts to unradiogenic values, two of which correspond to black shale horizons in the lower to mid-Aptian, namely the Wezel (herein named) and Fallot Levels. These Os isotopic excursions are ascribed to massive inputs of unradiogenic Os to the ocean through hydrothermal activity. Combining the new Os isotopic record with published data from the lowermost Aptian organic-rich interval in the Gorgo a Cerbara section of the Umbria-Marche Basin, it can be inferred that Ontong Java Nui volcanic eruptions persisted for ~5 m.y. during the early to mid-Aptian.

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