TY - GEN
T1 - Global patterns of reactivity and sources of organic matter in marine sediments
T2 - 29th International Meeting on Organic Geochemistry, IMOG 2019
AU - Freitas, F. S.
AU - Pika, P. A.
AU - Holtvoeth, J.
AU - Arndt, S.
AU - Pancost, R. D.
PY - 2019/9/30
Y1 - 2019/9/30
N2 - Understanding the mechanisms dictating organic matter (OM) burial in marine sediments at a global scale is crucial for accurate assessments of carbon and nutrient cycling. The lack of a mechanistic framework that allows us to interrogate the main drivers behind OM degradation and preservation in different geographical and time scales limits our ability to produce robust forecasts of future perturbations on the global carbon cycle and Earth climate. Such a framework would help improve model parameterisation, and thus benefit both data-poor areas and time scales. Arndt et al. (2013) have demonstrated the overall lack of global-scale clear relationships between OM burial patterns and single characteristics of depositional environments. That represents a huge limitation in improving model parameterisation for a better representation of processes controlling OM cycling in marine sediments (Hülse et al., 2018). Therefore, there is a clear need to improve our understanding of OM burial in a broad sense, considering various aspects from OM sources, through transport, to final deposition. We use a multidisciplinary approach, in which we investigate OM sources through lipid biomarker compositions and compare those to quantitatively determined OM reactivity (k) by means of Reaction-Transport modelling (RTM). We develop our coupled model-lipid biomarker approach for several depositional environments, comprising coastal, marginal, and deep-sea sites, within a range of depositional rates and sediment redox conditions. Our aim is to establish a global-scale quantitative link between OM reactivity (k) and OM sources
AB - Understanding the mechanisms dictating organic matter (OM) burial in marine sediments at a global scale is crucial for accurate assessments of carbon and nutrient cycling. The lack of a mechanistic framework that allows us to interrogate the main drivers behind OM degradation and preservation in different geographical and time scales limits our ability to produce robust forecasts of future perturbations on the global carbon cycle and Earth climate. Such a framework would help improve model parameterisation, and thus benefit both data-poor areas and time scales. Arndt et al. (2013) have demonstrated the overall lack of global-scale clear relationships between OM burial patterns and single characteristics of depositional environments. That represents a huge limitation in improving model parameterisation for a better representation of processes controlling OM cycling in marine sediments (Hülse et al., 2018). Therefore, there is a clear need to improve our understanding of OM burial in a broad sense, considering various aspects from OM sources, through transport, to final deposition. We use a multidisciplinary approach, in which we investigate OM sources through lipid biomarker compositions and compare those to quantitatively determined OM reactivity (k) by means of Reaction-Transport modelling (RTM). We develop our coupled model-lipid biomarker approach for several depositional environments, comprising coastal, marginal, and deep-sea sites, within a range of depositional rates and sediment redox conditions. Our aim is to establish a global-scale quantitative link between OM reactivity (k) and OM sources
UR - http://www.scopus.com/inward/record.url?scp=85084018453&partnerID=8YFLogxK
U2 - 10.3997/2214-4609.201902676
DO - 10.3997/2214-4609.201902676
M3 - Conference contribution
AN - SCOPUS:85084018453
T3 - 29th International Meeting on Organic Geochemistry, IMOG 2019
SP - 1
EP - 2
BT - 29th International Meeting on Organic Geochemistry, IMOG 2019
PB - European Association of Geoscientists and Engineers, EAGE
Y2 - 1 September 2019 through 6 September 2019
ER -