Spatial heterogeneity of organic carbon cycling in sediments of the northern Yap Trench: Implications for organic carbon burial

2020 ◽  
Vol 223 ◽  
pp. 103813 ◽  
Author(s):  
Dong Li ◽  
Jun Zhao ◽  
Peng Yao ◽  
Chenggang Liu ◽  
Chengjun Sun ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Spatial Heterogeneity ◽  
Carbon Cycling ◽  
Carbon Burial ◽  
Organic Carbon Burial ◽  
Organic Carbon Cycling

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 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

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.

Organic Carbon Burial in Lakes and Reservoirs of the Conterminous United States

2015 ◽  
Vol 49 (13) ◽  
pp. 7614-7622 ◽  
Author(s):  
David W. Clow ◽  
Sarah M. Stackpoole ◽  
Kristine L. Verdin ◽  
David E. Butman ◽  
Zhiliang Zhu ◽  
...  
Keyword(s):  
United States ◽  
Organic Carbon ◽  
Carbon Burial ◽  
Organic Carbon Burial ◽  
Lakes And Reservoirs

scholarly journals Organic Carbon Cycling in Ulleung Basin Sediments, East Sea

2010 ◽  
Vol 32 (2) ◽  
pp. 145-156 ◽  
Author(s):  
Tae-Hee Lee ◽  
Dong-Seon Kim ◽  
Boo-Keun Khim ◽  
Dong-Lim Choi
Keyword(s):  
Organic Carbon ◽  
Carbon Cycling ◽  
East Sea ◽  
Ulleung Basin ◽  
Organic Carbon Cycling
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