Biogeochemical Budgeting in Estuaries

Swaney, Dennis P.

doi:10.1016/b978-0-12-374711-2.00513-1

Cited by 3 publications

(12 citation statements)

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“…studies of benthic fluxes, primary production, physical water exchanges derived from current meters) or using fully dynamic ecosystem modelling which parameterises and links processes to create data on the system. A third approach is 'inverse' modelling, which is essentially a model driven by data, and represents a middle ground between the first two approaches (Swaney 2011). Here, we use the third approach, biogeochemical mass balance inverse modelling, to evaluate important ecosystem parameters of four large coastal systems in New Zealand (NZ).…”

Section: Communicated By Isaac Santosmentioning

confidence: 99%

Balance of Catchment and Offshore Nutrient Loading and Biogeochemical Response in Four New Zealand Coastal Systems: Implications for Resource Management

Zeldis

Swaney

2018

Estuaries and Coasts

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Nutrient mass balance analyses are a way of obtaining 'whole system' viewpoints on coastal biogeochemical functions and their forcing. Seasonal mass balances are presented for four large bay systems in New Zealand (NZ), with the aim of showing how they can inform coastal management. Freshwater volumes, and surface and groundwater, wastewater and atmospheric inorganic and organic nitrogen (N) and phosphorus (P) were balanced with levels of salinity, N and P from ocean surveys, used to determine non-conservative N and P fluxes and, via stoichiometry, carbon (C) fluxes. For Golden and Tasman Bays and Hauraki Gulf, exchange with adjacent shelf waters usually dominated total N supply (80-85%). In contrast, for the Firth of Thames, 51% of total N and 85% of dissolved inorganic N supply originated from its agricultural catchment. Net ecosystem metabolism (NEM; balance of autotrophy and heterotrophy) of Golden and Tasman Bays and Hauraki Gulf was usually nearly balanced. In contrast, Firth NEM was highly seasonally variable, often exhibiting strong heterotrophy coincident with expression of respiration-related stressors (low O 2 and high DIC/low pH). Denitrification accounted for about 51% of total N export across the four systems, signifying its importance as a eutrophication-regulating ecosystem service. Budgets made 12 years apart in the Firth showed decreased denitrification efficiency, coincident with large increases in system N and phytoplankton. The findings for land-ocean nutrient balance, NEM and denitrification showed how mass balance budgeting can inform coastal management, including inventories of nutrient inputs, balances of oceanic and terrestrial nutrient loading, and potential for risk associated with biogeochemical responses.

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Section: Communicated By Isaac Santosmentioning

confidence: 99%

Balance of Catchment and Offshore Nutrient Loading and Biogeochemical Response in Four New Zealand Coastal Systems: Implications for Resource Management

Zeldis

Swaney

2018

Estuaries and Coasts

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“…The LOICZ methodology uses the fundamental concept of ecology and geochemistry, which is the conservation of mass and a class of mass balance budgets to estimate water-salt-nutrient budgets (Gordon et al, 1996, Wepener, 2007, Swaney, 2011. The mathematical structure of the LOICZ budgeting procedure of C, N and P fluxes in estuaries and coastal waters is described in the guidelines of Gordon et al (1996) and Swaney (2011). The approach starts with a simple one compartment and .…”

Section: Loicz Biogeochemical Budget Methodologymentioning

confidence: 99%

“…Biogeochemical budgets have been used for many years to provide insights on nutrient fluxes and processes in estuaries, and to evaluate the impacts of human activities on these processes (Swaney, 2011). In particular, a nutrient budget can provide a fundamental framework for identifying and assessing the importance of various nutrient sources or sinks within an estuarine system.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, a nutrient budget can provide a fundamental framework for identifying and assessing the importance of various nutrient sources or sinks within an estuarine system. Amongst scientific budget methodology programs, the Land-Ocean Interactions in the Coastal Zone (LOICZ) biogeochemical budget program (Gordon et al, 1996, Swaney andGiordani, 2011) was probably the best known in constructing quantitative nutrient budgets for coastal and marine waters (Swaney, 2011). The original aim of LOICZ program focuses on understanding the role and contributions of the coastal zone to the global carbon and nutrient cycles (Swaney, 2011.…”

Section: Introductionmentioning

confidence: 99%

“…Amongst scientific budget methodology programs, the Land-Ocean Interactions in the Coastal Zone (LOICZ) biogeochemical budget program (Gordon et al, 1996, Swaney andGiordani, 2011) was probably the best known in constructing quantitative nutrient budgets for coastal and marine waters (Swaney, 2011). The original aim of LOICZ program focuses on understanding the role and contributions of the coastal zone to the global carbon and nutrient cycles (Swaney, 2011. However, in the second phase of LOICZ (2004LOICZ ( -2014, increased concerns with implications of human activities and the potential use of simple nutrient budgeting approaches in management of coastal ecosystems seeks attention from many scientists and managers.…”

Section: Introductionmentioning

confidence: 99%

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Anthropogenic influences on ecosystem processes in a tropical estuary: feedback connections and environmental management targets - a case study of Dong Ho Estuary, Kien Giang, Vietnam

Vu¹

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Estuaries play an invaluable role in the transformation and cycling of materials as they move between land and sea; including anthropogenic materials. Increasingly, human activities are delivering material loads that risk overwhelming the normal functions that these ecosystems provide. In this context, the objective of this study is to assess key biogeochemical processes to understand the influence of anthropogenic activities on ecosystem performance in a tropical estuary. The research presented here focuses on a case study area, Dong Ho estuary in Kien Giang province, Vietnam, which exemplifies the anthropogenic impacts and management issues facing most of the Mekong coastline and other similar areas in Vietnam. Located at the southwestern edge of the Mekong delta, the Dong Ho estuary is subject to material inputs from both local and more remote sources; making

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Carbon budget of a shallow, lagoonal estuary: Transformations and source‐sink dynamics along the river‐estuary‐ocean continuum

Crosswell

Anderson

Stanhope

et al. 2017

Limnology & Oceanography

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A comprehensive carbon budget was constructed to quantify carbon flows through the freshwater‐marine continuum of a temperate, microtidal estuary. We performed coordinated measurements of dissolved inorganic carbon and total organic carbon fluxes to resolve spatial variability between and along the channel and shoals and diel variability across the entire estuary for 2 yr. Net ecosystem metabolism (NEM) was the most significant control on carbon flow within estuary regions. However, metabolic rates were spatially coupled such that counteracting fluxes across the channel‐shoal gradient or along the river‐ocean gradient resulted in system‐wide NEM that was closely in balance (–3.0 ± 3.3 to 1.1 ± 4.4 molC m−2 yr−1). Similarly, large diel and seasonal variability in air–water CO2 fluxes were observed during 72 spatial surveys, but these short‐term variations generally cancelled out when aggregated to annual budget terms. Although atmospheric exchanges were small (–0.2 ± 0.1 to 2.0 ± 0.4 molC m−2 yr−1), they were subject to large errors (± 4 molC m−2 yr−1) if diel variability was neglected. Internal mechanisms that maintained balanced carbon flows were strongly impacted by river discharge and were only apparent by separately quantifying channel and shoal fluxes. Notably, metabolic responses of the shoal to river forcing outweighed the responses of the channel, and the net impact was contrary to prior relationships derived from synthesis of lower‐resolution carbon budgets. Our budget demonstrates that resolution of carbon fluxes at appropriate scales, including channel‐shoal and diel variability, is critical to characterizing ecosystem function and the fate of carbon within the river‐ocean continuum.

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Biogeochemical Budgeting in Estuaries

Cited by 3 publications

References 100 publications

Balance of Catchment and Offshore Nutrient Loading and Biogeochemical Response in Four New Zealand Coastal Systems: Implications for Resource Management

Balance of Catchment and Offshore Nutrient Loading and Biogeochemical Response in Four New Zealand Coastal Systems: Implications for Resource Management

Anthropogenic influences on ecosystem processes in a tropical estuary: feedback connections and environmental management targets - a case study of Dong Ho Estuary, Kien Giang, Vietnam

Carbon budget of a shallow, lagoonal estuary: Transformations and source‐sink dynamics along the river‐estuary‐ocean continuum

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