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Gradients and Dispersal Patterns of Organic Matter and Metals as Recorded in Narragansett Bay Sediments David Murray, Warren Prell, and numerous students Funding: Brown OVPR seed grant, URISeagrant, RIINBRE, NE Interstate Water Pollution Control Commission (EPA grant)

Gradients and Dispersal Patterns of Organic Matter and

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Page 1: Gradients and Dispersal Patterns of Organic Matter and

Gradients and Dispersal Patterns of Organic Matter and Metals as Recorded in Narragansett Bay Sediments

David Murray, Warren Prell, and numerous students

Funding: Brown OVPR seed grant, URI‐Seagrant, RI‐INBRE, NE Interstate Water Pollution Control Commission (EPA grant)

Page 2: Gradients and Dispersal Patterns of Organic Matter and

Murray, D.W., Prell, W.L., Rincon, C.E., and Saarman, E., 2007. Physical property and chemical characteristics of surface sediment grab samples from Narragansett Bay and the Providence and Seekonk Rivers, a summary of the Brown University Narragansett Bay Sediment Project (BUNBSP). Narragansett Bay Estuary Program Report NBEP‐07‐127.

Surface Grab Samples363: grain size, C, N,111: chemistry

Page 3: Gradients and Dispersal Patterns of Organic Matter and

= Seekonk River= Prov River= Upper Bay

+ = Greenwich Bay= West Passage

x = East Passage

Page 4: Gradients and Dispersal Patterns of Organic Matter and

= Seekonk River= Prov River= Upper Bay

+ = Greenwich Bay= West Passage

x = East Passage

ERL: effects range‐ low (10%)ERM: effects range‐median (50%)Long et al, 1995, Env. Mgt., 19: 81‐97

Page 5: Gradients and Dispersal Patterns of Organic Matter and
Page 6: Gradients and Dispersal Patterns of Organic Matter and

1850 ‐>

Page 7: Gradients and Dispersal Patterns of Organic Matter and

1610

1660

1710

1760

1810

1860

1910

1960

20100 50 100

Year AD

Pb (ppm) 0.0 0.4 0.8 1.2Hg (ppm)

Dep

th (cm)

Upper Narragansett Bay  Core 8

Page 8: Gradients and Dispersal Patterns of Organic Matter and