Is the mobilization of sedimentary phosphorus a key player for sustaining eutrophication in the Chesapeake Bay?
EMSL Project ID
48437
Abstract
With the rise of coastal dead zones, oxygen-dependent feedback effects on phosphorus (P) cycling in coastal environments will play more important roles globally. Proposed research will employ phosphate oxygen stable isotopes in tandem with innovative application of EMSL resources (NMR, Mossbauer spectroscopy, transmission and scanning electron microscopy, XRD) to develop a detailed and integrated understanding of bottom water and sediment P speciation, and spatial discrimination of organic matter remineralization and authigenic P precipitation in the Chesapeake Bay. This research will provide direct and coherent evidence of the interplay and feedback between sediment and water column P in the hypoxic/anoxic water column and particularly identify the source of P that sustains hypoxia and could support phytoplankton blooms in the surface water. Research outcomes of the proposed research will be applicable to other comparable coastal and marine environments, permanently anoxic basins, and early Earth environments.
Project Details
Project type
Large-Scale EMSL Research
Start Date
2014-10-01
End Date
2016-09-30
Status
Closed
Released Data Link
Team
Principal Investigator
Team Members
Related Publications
Jaisi D.P., H. Yuan, Q. Li, R.K. Kukkadapu, E. Liu, J. Yu, and H. Fang, et al. 2019. "Identifying sources and cycling of phosphorus in the sediment of a shallow freshwater lake in China using phosphate oxygen isotopes." Science of the Total Environment 676. PNNL-SA-143558. doi:10.1016/j.scitotenv.2019.04.322
Li J ,Reardon P N,McKinley J P,Joshi S ,Bai Y ,Bear K ,Jaisi D P 2017. "Water column particulate matter contributes to phosphorus regeneration and sequestration in the Chesapeake Bay" Geochimica et Cosmochimica Acta 122(4):737–752. 10.1002/2016JG003572
News article from University of Delaware Research Office (based on Joshi et al., 2015 paper): Remineralization: UD-led research suggests new pathway of phosphorus cycling in the Chesapeake Bay
O'Connell D., N. Ansems, R.K. Kukkadapu, D.P. Jaisi, D. Orihel, B. Cade-Menun, and Y. Hu, et al. 2020. "Changes in sedimentary phosphorus burial following artificial eutrophication of Lake 227, Experimental Lakes Area, Ontario, Canada." Journal of Geophysical Research. Biogeosciences 125, no. 8:Article No.e2020JG005713. PNNL-SA-151732. doi:10.1029/2020JG005713
Sunendra JR, RK Kukkadapu, DJ Burdige, ME Bowden, DL Sparks, and DP Jaisi. 2015. "Organic Matter Remineralization Predominates Phosphorus Cycling in the Mid-Bay Sediments in the Chesapeake Bay." Environmental Science & Technology. doi:10.1021/es5059617