Modeling the dynamics and export of dissolved organic matter in the Northeastern U.S. continental shelf

Druon, Jean Noël; Mannino, Antonio; Signorini, Sérgio R.; McClain, Charles R.; Friedrichs, Marjorie A. M.; Wilkin, John; Fennel, Katja

doi:10.1016/j.ecss.2010.05.010

Cited by 61 publications

(76 citation statements)

References 92 publications

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“…This coupled-modeling framework has been used to investigate the role of sediment denitrification as a nutrient sink (Fennel et al 2006) and the controls on air-sea carbon fluxes on the NENA continental shelf . Additional studies with the NENA model have provided estimates of cross-shelf export of particulate organic carbon ) and an evaluation of the role of dissolved organic matter (DOM) dynamics in coastal ocean biogeochemical cycling (Druon et al 2010). Results from these studies are described more fully in a later section.…”

Section: Figurementioning

confidence: 99%

“…Coastal carbon modeling systems range from box models (e.g., Walsh 1988) ( Table 1) to 3D, coupled circulation-biogeochemical models (e.g., Moll 1998, Fennel et al 2006, Druon et al 2010 (Table 2). Similarly, representation of the biogeochemical processes ranges from nutrient-phytoplankton-zooplankton aggregate formulations to multifunctional group representations of the ecosystem (e.g., Le Quéré et al 2005, Lehmann et al 2009).…”

Section: Figurementioning

confidence: 99%

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Modeling the Dynamics of Continental Shelf Carbon

Hofmann

Cahill

Fennel

et al. 2011

Annu. Rev. Mar. Sci.

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Continental margin systems are important contributors to global nutrient and carbon budgets. Effort is needed to quantify this contribution and how it will be modified under changing patterns of climate and land use. Coupled models will be used to provide projections of future states of continental margin systems. Thus, it is appropriate to consider the limitations that impede the development of realistic models. Here, we provide an overview of the current state of modeling carbon cycling on continental margins as well as the processes and issues that provide the next challenges to such models. Our overview is done within the context of a coupled circulation-biogeochemical model developed for the northeastern North American continental shelf region. Particular choices of forcing and initial fields and process parameterizations are used to illustrate the consequences for simulated distributions, as revealed by comparisons to observations using quantitative statistical metrics.

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Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Modeling the Dynamics of Continental Shelf Carbon

Hofmann

Cahill

Fennel

et al. 2011

Annu. Rev. Mar. Sci.

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“…As in Feng et al (2015), the model is configured to use the recursive MPDATA 3-D advection scheme for tracers, third-order upstream advection scheme for horizontal momentum, and fourth-order centered difference for momentum in the vertical, with a 20-layer vertically stretched sigma grid. The Estuarine-CarbonBiogeochemistry (ECB) component of the model (Feng et al, 2015) was developed originally from a continental shelf application (Hofmann et al, 2011), using dissolved organic matter cycling similar to that described in Druon et al (2010). With only single phytoplankton and zooplankton classes and only one limiting nutrient (nitrogen), the ECB model is simpler than that employed by the Chesapeake Bay Program (Cerco et al, 2010) but is more complex than simple dissolved-oxygen models that utilize a constant oxygen consumption rate (e.g., Scully, 2010;Bever et al, 2013).…”

Section: Chesroms-ecbmentioning

confidence: 99%

The competing impacts of climate change and nutrient reductions on dissolved oxygen in Chesapeake Bay

et al. 2018

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Abstract. The Chesapeake Bay region is projected to experience changes in temperature, sea level, and precipitation as a result of climate change. This research uses an estuarine-watershed hydrodynamic-biogeochemical modeling system along with projected mid-21st-century changes in temperature, freshwater flow, and sea level rise to explore the impact climate change may have on future Chesapeake Bay dissolved-oxygen (DO) concentrations and the potential success of nutrient reductions in attaining mandated estuarine water quality improvements. Results indicate that warming bay waters will decrease oxygen solubility year-round, while also increasing oxygen utilization via respiration and remineralization, primarily impacting bottom oxygen in the spring. Rising sea level will increase estuarine circulation, reducing residence time in bottom waters and increasing stratification. As a result, oxygen concentrations in bottom waters are projected to increase, while oxygen concentrations at mid-depths (3 < DO < 5 mg L −1 ) will typically decrease. Changes in precipitation are projected to deliver higher winter and spring freshwater flow and nutrient loads, fueling increased primary production. Together, these multiple climate impacts will lower DO throughout the Chesapeake Bay and negatively impact progress towards meeting water quality standards associated with the Chesapeake Bay Total Maximum Daily Load. However, this research also shows that the potential impacts of climate change will be significantly smaller than improvements in DO expected in response to the required nutrient reductions, especially at the anoxic and hypoxic levels. Overall, increased temperature exhibits the strongest control on the change in future DO concentrations, primarily due to decreased solubility, while sea level rise is expected to exert a small positive impact and increased winter river flow is anticipated to exert a small negative impact.

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“…They are also valuable for determining the magnitude and importance of processes that are difficult to measure and observe in the field. Many recent coastal and open ocean biogeochemical ecosystem models have included DOM (Anderson and Pondaven, 2003;Anderson et al, 2007;Anderson andWilliams, 1998, 1999;Aumont et al, 2003;Baklouti et al, 2006a,b;Druon et al, 2010;Faure et al, 2006;Grégoire and Soetaert, 2010;Llebot et al, 2010;Luo et al, 2010;Nakata and Doi, 2006;Pahlow and Vézina, 2003;Pahlow et al, 2008;Polimene et al, 2006Polimene et al, , 2007Ruardij et al, 2005;Salihoglu et al, 2008;Schmittner et al, 2005;Vichi et al, 2007) in order to better simulate and understand biogeochemical cycles. Carbon and nitrogen are typically accounted for in these models, although a few include phosphorus as well.…”

Section: Introductionmentioning

confidence: 99%

Modeling the seasonal autochthonous sources of dissolved organic carbon and nitrogen in the upper Chesapeake Bay

Keller

Hood

2011

Ecological Modelling

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a b s t r a c tIn this paper we investigate the seasonal autochthonous sources of dissolved organic carbon (DOC) and nitrogen (DON) in the euphotic zone at a station in the upper Chesapeake Bay using a new mass-based ecosystem model. Important features of the model are: (1) carbon and nitrogen are incorporated by means of a set of fixed and varying C:N ratios; (2) dissolved organic matter (DOM) is separated into labile, semi-labile, and refractory pools for both C and N; (3) the production and consumption of DOM is treated in detail; and (4) seasonal observations of light, temperature, nutrients, and surface layer circulation are used to physically force the model. The model reasonably reproduces the mean observed seasonal concentrations of nutrients, DOM, plankton biomass, and chlorophyll a. The results suggest that estuarine DOM production is intricately tied to the biomass concentration, ratio, and productivity of phytoplankton, zooplankton, viruses, and bacteria. During peak spring productivity phytoplankton exudation and zooplankton sloppy feeding are the most important autochthonous sources of DOM. In the summer when productivity peaks again, autochthonous sources of DOM are more diverse and, in addition to phytoplankton exudation, important ones include viral lysis and the decay of detritus. The potential importance of viral decay as a source of bioavailable DOM from within the bulk DOM pool is also discussed. The results also highlight the importance of some poorly constrained processes and parameters. Some potential improvements and remedies are suggested. Sensitivity studies on selected parameters are also reported and discussed.

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Modeling the dynamics and export of dissolved organic matter in the Northeastern U.S. continental shelf

Cited by 61 publications

References 92 publications

Modeling the Dynamics of Continental Shelf Carbon

Modeling the Dynamics of Continental Shelf Carbon

The competing impacts of climate change and nutrient reductions on dissolved oxygen in Chesapeake Bay

Modeling the seasonal autochthonous sources of dissolved organic carbon and nitrogen in the upper Chesapeake Bay

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