| NSF Org: |
OCE Division Of Ocean Sciences |
| Recipient: |
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| Initial Amendment Date: | February 13, 2002 |
| Latest Amendment Date: | February 13, 2002 |
| Award Number: | 0136037 |
| Award Instrument: | Standard Grant |
| Program Manager: |
Donald L. Rice
OCE Division Of Ocean Sciences GEO Directorate for Geosciences |
| Start Date: | February 15, 2002 |
| End Date: | June 30, 2006 (Estimated) |
| Total Intended Award Amount: | $260,454.00 |
| Total Awarded Amount to Date: | $260,454.00 |
| Funds Obligated to Date: |
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| History of Investigator: |
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| Recipient Sponsored Research Office: |
4111 MONARCH WAY STE 204 NORFOLK VA US 23508-2561 (757)683-4293 |
| Sponsor Congressional District: |
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| Primary Place of Performance: |
HAMPTON BLVD NORFOLK VA US 23529-0001 |
| Primary Place of
Performance Congressional District: |
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| Unique Entity Identifier (UEI): |
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| Parent UEI: |
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| NSF Program(s): | Chemical Oceanography |
| Primary Program Source: |
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| Program Reference Code(s): |
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| Program Element Code(s): |
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| Award Agency Code: | 4900 |
| Fund Agency Code: | 4900 |
| Assistance Listing Number(s): | 47.050 |
ABSTRACT
ABSTRACT
OCE-0136037
Recently, it has been suggested that oxygen transport into sediments via the roots and rhizomes of seagrasses might resolve the observed discrepancy between the amount of carbonate dissolved and the amount of acid produced from remineralization of sediment organic matter. Combining field observations, laboratory experiments and modeling analysis, a PI from Old Dominion University will team up with a PI from San Jose State University to quantify the influence of seagrass productivity on carbon flux and carbonate dissolution in shallow waters of Lee Stocking Island, Bahamas, a tropical system. The PIs will compare the sediment and porewater composition recovered from a variety of sample types (bare ooid sands to densely vegetates regions with >70% seagrass cover) to establish the relationship between carbonate dissolution in sediments and seagrass density. Other studies to be carried out include incubation experiments of individual seagrass shoots to determine the amount of O2 generated by the roots and rhizomes under variable light and porewater O2 conditions. Additionally, whole sediment core incubation experiments will determine the rate of sediment organic matter degradation and carbonate dissolution. Lastly, Drs. Burdige and Zimmerman plan to compare their data with those obtained via a model of diagenetic processes in carbonate sediments. Results from this study will not only provide basic information on ecological and biogeochemical processes in tropical systems, but will help constrain budgets for carbonate cycling in shallow water carbonate bank environments.
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