Abstract Details
(2020) Relative Impacts of Global Changes and Regional Watershed Changes on the Inorganic Carbon Balance of the Chesapeake Bay
St-Laurent P, Friedrichs M, Najjar R, Shadwick E, Tian H, Yao Y & Stets E
https://doi.org/10.46427/gold2020.2464
The author has not provided any additional details.
12c: Plenary Hall, Wednesday 24th June 22:27 - 22:30
Pierre St-Laurent
View all 3 abstracts at Goldschmidt2020
View abstracts at 2 conferences in series
Marjorie Friedrichs View all 4 abstracts at Goldschmidt2020
Raymond Najjar View all 4 abstracts at Goldschmidt2020
Elizabeth Shadwick View all 4 abstracts at Goldschmidt2020
Hanqin Tian
Yuanzhi Yao
Edward Stets View all 3 abstracts at Goldschmidt2020 View abstracts at 2 conferences in series
Marjorie Friedrichs View all 4 abstracts at Goldschmidt2020
Raymond Najjar View all 4 abstracts at Goldschmidt2020
Elizabeth Shadwick View all 4 abstracts at Goldschmidt2020
Hanqin Tian
Yuanzhi Yao
Edward Stets View all 3 abstracts at Goldschmidt2020 View abstracts at 2 conferences in series
Listed below are questions that have been submitted by the community that the author will try and cover in their presentation. To submit a question, ensure you are signed in to the website. Authors or session conveners approve questions before they are displayed here.
Submitted by Christopher Sabine on Tuesday 16th June 22:59
wonderful talk...did you consider the increasing urbanization of the region around the bay over time? I would think, for example, that the increased sewage input to the bay could have a significant impact over the last 100 years or so.
Good question! Our modeling system includes two components, a 3-D estuarine model representing the Bay itself, and a process-based terrestrial model representing the east coast of North America at 4km resolution. The land model is called "DLEM", and it does take into account the historical changes in land-use around the Bay, including the increased urban sewage discharge (happy to send references if you're interested). So this is all included in our model experiments, but it is lumped together with everything else that historically affected riverine nitrogen concentrations (e.g., agriculture and fertilizer usage). Therefore, I cannot comment specifically on the role played by sewarge discharge, but we could definitely design an experiment to highlight this particular contribution (i.e. it's something that we could do in the future).
wonderful talk...did you consider the increasing urbanization of the region around the bay over time? I would think, for example, that the increased sewage input to the bay could have a significant impact over the last 100 years or so.
Good question! Our modeling system includes two components, a 3-D estuarine model representing the Bay itself, and a process-based terrestrial model representing the east coast of North America at 4km resolution. The land model is called "DLEM", and it does take into account the historical changes in land-use around the Bay, including the increased urban sewage discharge (happy to send references if you're interested). So this is all included in our model experiments, but it is lumped together with everything else that historically affected riverine nitrogen concentrations (e.g., agriculture and fertilizer usage). Therefore, I cannot comment specifically on the role played by sewarge discharge, but we could definitely design an experiment to highlight this particular contribution (i.e. it's something that we could do in the future).
Submitted by Zhao Wang on Wednesday 24th June 05:05
Really interesting talk. Have you considered the terrestrial plant effects on this costal settings? Plus do you think seasonality on the plants has effects on organic matter input to the river and consequently affect inorganic matter running out of river?
Thank you for the question! Yes, the riverine fluxes to the estuarine model are computed by a process-based terrestrial model of the U.S. east coast at 4km resolution (DLEM). DLEM calculates temporally and spatially explicit fluxes of water, carbon and nitrogen, throughout the terrestrial ecosystem. This include the seasonal cycle of terrestrial plants and their effects on the organic and inorganic fluxes from the rivers. In this study we focus on the dynamics taking place downstream of the rivers, but the effect of terrestrial plants is accounted for. You can read more about DLEM in the following references: https://doi.org/10.1111/jawr.12232 https://doi.org/10.1002/2014JG002763 https://doi.org/10.1002/2014JG002760
Really interesting talk. Have you considered the terrestrial plant effects on this costal settings? Plus do you think seasonality on the plants has effects on organic matter input to the river and consequently affect inorganic matter running out of river?
Thank you for the question! Yes, the riverine fluxes to the estuarine model are computed by a process-based terrestrial model of the U.S. east coast at 4km resolution (DLEM). DLEM calculates temporally and spatially explicit fluxes of water, carbon and nitrogen, throughout the terrestrial ecosystem. This include the seasonal cycle of terrestrial plants and their effects on the organic and inorganic fluxes from the rivers. In this study we focus on the dynamics taking place downstream of the rivers, but the effect of terrestrial plants is accounted for. You can read more about DLEM in the following references: https://doi.org/10.1111/jawr.12232 https://doi.org/10.1002/2014JG002763 https://doi.org/10.1002/2014JG002760
Submitted by Pierre Regnier on Wednesday 24th June 19:26
Nice talk ! My question comes very late, thus I hope I will have the chance to ask it "live" later today, but I would like to have your view on this point: Estuaries have generally be considered intense CO2 emitters because of their strong net autotrophy. Your results however nicely show that the increasing atm. CO2 also plays a significant role and I was wondering if our views of estuarine systems could partly be biased. Basically, could the saline parts of estuaries (generally characterized by much smaller flux densities but also with much wider surface area) already be CO2 sinks through the action of the physical dissolution pump only ?
Nice talk ! My question comes very late, thus I hope I will have the chance to ask it "live" later today, but I would like to have your view on this point: Estuaries have generally be considered intense CO2 emitters because of their strong net autotrophy. Your results however nicely show that the increasing atm. CO2 also plays a significant role and I was wondering if our views of estuarine systems could partly be biased. Basically, could the saline parts of estuaries (generally characterized by much smaller flux densities but also with much wider surface area) already be CO2 sinks through the action of the physical dissolution pump only ?
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