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Determining a PROXY for Sediment Oxygen Demand of Coastal Estuaries Erin Anderson 1, Karen McNeal 1, Mel Parsons 2, Sandra Ortega-Achury 3, Curry Templeton.

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Presentation on theme: "Determining a PROXY for Sediment Oxygen Demand of Coastal Estuaries Erin Anderson 1, Karen McNeal 1, Mel Parsons 2, Sandra Ortega-Achury 3, Curry Templeton."— Presentation transcript:

1 Determining a PROXY for Sediment Oxygen Demand of Coastal Estuaries Erin Anderson 1, Karen McNeal 1, Mel Parsons 2, Sandra Ortega-Achury 3, Curry Templeton 1, Alon Blakeney 4, Jonathon Geroux 1 This material is based upon work supported by the National Science Foundation under Grant No. DGE-0947419 and the USEPA under Grant No. AE83604801at Mississippi State University. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation and the USEPA. 1 Department of Geosciences, Mississippi State University, PO BOX 5448, Mississippi, 39762 2 USEPA Region 4 Science & Ecosystems Support Div., 980 College Station Road, Athens, GA 30605-2720 3 Department of Civil and Environmental Engineering, Mississippi State University, PO Box 9546, Mississippi, 39762 4 Department of Biology, Mississippi State University, PO Box 9536, Mississippi, 39762

2 Sediment Oxygen Demand SOD = O 2 used by biological + chemical processes

3 http://apps.startribune.com/blogs/user_images/fdsmith_1332283277_1fishkill0321.jpg High SOD + Low O 2 =

4 http://www.tampabay.com/multimedia/archive/00188/clwbloom 082711_188617c.jpg High SOD + Low O 2 =

5 Microbial Metabolisms

6 http://njscuba.net/zzz_biology/low_oxy_evnt_1.gif Non-ubiquitous O 2 circulation Decomposition and Respiration still occurring Low O 2 levels cause death, continuing decomposition Biological SOD

7 Fe (II) Mn (II) Fe(OH) 2 Mn(OH) 3 Fe (II) Mn (II) Chemical Sediment Oxygen Demand Water current Gas bubbles

8 http://www.sciencedirect.com/science/article/pii/S0141113612001043

9 1.Can we estimate SOD without benthic oxygen chambers? Research Questions

10 1.Can we estimate SOD without benthic oxygen chambers? 2. Can geochemical measurements in the water column and porewater give an accurate prediction of SOD? Research Questions

11

12

13 http://www.envcoglobal.com/files/MO-YSI-600R.jpg pH Eh Temperature DO Water Column

14 Porewater Eh pH Oxygen Sulfide http://www.unisense.com/files/Images/Sensorbilleder/PH- 100_900x430.jpg

15 Aluminum Iron Manganese Sulfide Porewater

16 Sediment Short-Term (C-D) Reactive Iron Long-Term (HCl) Reactive Iron

17 Water Column Data Weeks Bay Tampa Bay

18 Porewater Data Weeks Bay Tampa Bay Consistent graphs!

19 Porewater Data Weeks Bay Tampa Bay Consistent graphs!

20 Porewater Data Weeks Bay Tampa Bay

21 Weeks Bay Tampa Bay Solid-Phase Reactive Iron

22 Tampa & Weeks PCA Eigenvalues > 1 Factor Component 1 (49.89 %) Component 2 (39.79%) SOD -.150-.741 H2S_core.664.734 pH_core -.926-.184 O2_core.889.413 Eh_core.429.818 Fe_PW.189.910 CD_Fe.892.398 HCl_Fe.876.456 H2S_OW.704.684 O2_OW.262.941 Eh_OW -.625-.704 pH_OW -.899-.401 Temp -.909-.090 * *

23 Temp pH_PW pH_OW Eh_OW SOD Fe_PW O2_OW Eh_core H2S_core H2S_OW HCl Fe O2_core CD_Fe Component Plot in Rotated Space Component 2 Component 1 Key WC = Water Column PW = Porewater Core = porewater Component 2 Component 1

24 Temp pH_PW pH_OW Eh_OW SOD Fe_PW O2_OW Eh_core H2S_core H2S_OW HCl Fe O2_core CD_Fe Component Plot in Rotated Space Key WC = Water Column PW = Porewater Core = porewater Component 2 Component 1 Temp pH_PW pH_OW Eh_OW SOD Fe_PW O2_OW Eh_core H2S_core H2S_OW HCl Fe O2_core CD_Fe

25 Conclusion & Future Goals Preliminary data suggest an easier indirect proxy to estimate SOD exists Which proxies consistently fluctuate with SODs in SEUS estuaries? Can we build and validate a diagenesis model, using an empirical model based on the Chesapeake Bay Sediment Flux Model for SOD estimation? Why do certain factors fluctuate with SOD?

26 Acknowledgements NSF GK 12 Project Grant No. DGE- 0947419 USEPA under Grant No. AE83604801 A.D.’s camera skills Erin Andersonela52@msstate.edu

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