Two-Phase System Model to Assess Hydrophobic Organic Compound Sorption to Dissolved Organic Matter

2020 ◽  
Vol 54 (19) ◽  
pp. 12173-12180
Author(s):  
Kun Liu ◽  
Lingran Kong ◽  
Jiaxue Wang ◽  
He Cui ◽  
Heyun Fu ◽  
...  
Keyword(s):  
Organic Matter ◽  
Organic Compound ◽  
Dissolved Organic Matter ◽  
System Model ◽  
Phase System ◽  
Two Phase

Two-dimensional FTIR correlation spectroscopy reveals chemical changes in dissolved organic matter during the biodrying process of raw sludge and anaerobically digested sludge

RSC Advances ◽  
2015 ◽  
Vol 5 (100) ◽  
pp. 82087-82096 ◽  
Author(s):  
Xiaowei Li ◽  
Xiaohu Dai ◽  
Lingling Dai ◽  
Zhigang Liu
Keyword(s):  
Organic Matter ◽  
Organic Compound ◽  
Dissolved Organic Matter ◽  
Correlation Spectroscopy ◽  
Two Dimensional ◽  
Digested Sludge ◽  
Chemical Changes ◽  
Aerobic Process ◽  
Anaerobically Digested Sludge

2D FTIR COS analysis is a feasible technique to explore the degradation characteristics of sludge organic matter, and supplies the first evidence for the complementarities of anaerobic and aerobic process in sludge organic compound degradation.

scholarly journals Variable C : N : P stoichiometry of dissolved organic matter cycling in the Community Earth System Model

2014 ◽  
Vol 11 (6) ◽  
pp. 9071-9101 ◽  
Author(s):  
R. T. Letscher ◽  
J. K. Moore ◽  
Y.-C. Teng ◽  
F. Primeau
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
General Circulation ◽  
General Circulation Models ◽  
Ocean Model ◽  
Earth System Model ◽  
System Model ◽  
Earth System ◽  
Organic C ◽  
Community Earth System Model

Abstract. Dissolved organic matter (DOM) plays an important role in the ocean's biological carbon pump by providing an advective/mixing pathway for ~ 20% of export production. DOM is known to have a stoichiometry depleted in nitrogen (N) and phosphorus (P) compared to the particulate organic matter pool, a~fact that is often omitted from biogeochemical-ocean general circulation models. However the variable C : N : P stoichiometry of DOM becomes important when quantifying carbon export from the upper ocean and linking the nutrient cycles of N and P with that of carbon. Here we utilize recent advances in DOM observational data coverage and offline tracer-modeling techniques to objectively constrain the variable production and remineralization rates of the DOM C / N / P pools in a simple biogeochemical-ocean model of DOM cycling. The optimized DOM cycling parameters are then incorporated within the Biogeochemical Elemental Cycling (BEC) component of the Community Earth System Model and validated against the compilation of marine DOM observations. The optimized BEC simulation including variable DOM C : N : P cycling was found to better reproduce the observed DOM spatial gradients than simulations that used the canonical Redfield ratio. Global annual average export of dissolved organic C, N, and P below 100 m was found to be 2.28 Pg C yr−1 (143 Tmol C yr−1), 16.4 Tmol N yr−1, and 1 Tmol P yr−1, respectively with an average export C : N : P stoichiometry of 225 : 19 : 1 for the semilabile (degradable) DOM pool. DOC export contributed ~ 25% of the combined organic C export to depths greater than 100 m.

scholarly journals Variable C : N : P stoichiometry of dissolved organic matter cycling in the Community Earth System Model

2015 ◽  
Vol 12 (1) ◽  
pp. 209-221 ◽  
Author(s):  
R. T. Letscher ◽  
J. K. Moore ◽  
Y.-C. Teng ◽  
F. Primeau
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
General Circulation ◽  
General Circulation Models ◽  
Ocean Model ◽  
Earth System Model ◽  
System Model ◽  
Earth System ◽  
Organic C ◽  
Community Earth System Model

Abstract. Dissolved organic matter (DOM) plays an important role in the ocean's biological carbon pump by providing an advective/mixing pathway for ~ 20% of export production. DOM is known to have a stoichiometry depleted in nitrogen (N) and phosphorus (P) compared to the particulate organic matter pool, a fact that is often omitted from biogeochemical ocean general circulation models. However the variable C : N : P stoichiometry of DOM becomes important when quantifying carbon export from the upper ocean and linking the nutrient cycles of N and P with that of carbon. Here we utilize recent advances in DOM observational data coverage and offline tracer-modeling techniques to objectively constrain the variable production and remineralization rates of the DOM C : N : P pools in a simple biogeochemical-ocean model of DOM cycling. The optimized DOM cycling parameters are then incorporated within the Biogeochemical Elemental Cycling (BEC) component of the Community Earth System Model (CESM) and validated against the compilation of marine DOM observations. The optimized BEC simulation including variable DOM C : N : P cycling was found to better reproduce the observed DOM spatial gradients than simulations that used the canonical Redfield ratio. Global annual average export of dissolved organic C, N, and P below 100 m was found to be 2.28 Pg C yr−1 (143 Tmol C yr−1, 16.4 Tmol N yr−1, and 1 Tmol P yr−1, respectively, with an average export C : N : P stoichiometry of 225 : 19 : 1 for the semilabile (degradable) DOM pool. Dissolved organic carbon (DOC) export contributed ~ 25% of the combined organic C export to depths greater than 100 m.

scholarly journals Multi‐enzyme cascade reaction in a miniplant two‐phase‐system : Model validation and mathematical optimization

AIChE Journal ◽  
2021 ◽  
Author(s):  
Jens Johannsen ◽  
Francesca Meyer ◽  
Claudia Engelmann ◽  
Andreas Liese ◽  
Georg Fieg ◽  
...  
Keyword(s):  
Model Validation ◽  
Mathematical Optimization ◽  
Cascade Reaction ◽  
System Model ◽  
Phase System ◽  
Two Phase ◽  
Enzyme Cascade

scholarly journals Multi-Enzyme Cascade Reaction in a Miniplant Two-Phase-System: Model Validation and Mathematical Optimization

2020 ◽  
Author(s):  
Jens Johannsen ◽  
Francesca Meyer ◽  
Claudia Engelmann ◽  
Andreas Liese ◽  
Georg Fieg ◽  
...  
Keyword(s):  
Model Validation ◽  
Mathematical Optimization ◽  
Cascade Reaction ◽  
System Model ◽  
Phase System ◽  
Two Phase ◽  
Enzyme Cascade

scholarly journals MESMO 3: Flexible phytoplankton stoichiometry and refractory dissolved organic matter

2021 ◽  
Vol 14 (4) ◽  
pp. 2265-2288
Author(s):  
Katsumi Matsumoto ◽  
Tatsuro Tanioka ◽  
Jacob Zahn
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Earth System Model ◽  
System Model ◽  
Earth System ◽  
Temperature Dependent ◽  
Potential Growth ◽  
Phosphate Nitrate ◽  
Residual Nitrate ◽  
Environmental Dependence

Abstract. We describe the third version of Minnesota Earth System Model for Ocean biogeochemistry (MESMO 3), an Earth system model of intermediate complexity, with a dynamical ocean, dynamic–thermodynamic sea ice, and an energy–moisture-balanced atmosphere. A major feature of version 3 is the flexible C:N:P ratio for the three phytoplankton functional types represented in the model. The flexible stoichiometry is based on the power law formulation with environmental dependence on phosphate, nitrate, temperature, and light. Other new features include nitrogen fixation, water column denitrification, oxygen and temperature-dependent organic matter remineralization, and CaCO3 production based on the concept of the residual nitrate potential growth. In addition, we describe the semi-labile and refractory dissolved organic pools of C, N, P, and Fe that can be enabled in MESMO 3 as an optional feature. The refractory dissolved organic matter can be degraded by photodegradation at the surface and hydrothermal vent degradation at the bottom. These improvements provide a basis for using MESMO 3 in further investigations of the global marine carbon cycle to changes in the environmental conditions of the past, present, and future.

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