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Geochemistry of sediment and organic matter in drainages burned by the Altas and Nuns wildfires in October 2017 and of nearshore seabed sediment in north San Francisco Bay from March to April 2018

Dates

Publication Date
Start Date
2018-03-17
End Date
2018-04-27

Citation

Takesue, R.K., 2020, Geochemistry of sediment and organic matter in drainages burned by the Altas and Nuns wildfires in October 2017 and of nearshore seabed sediment in north San Francisco Bay from March to April 2018: U.S. Geological Survey data release, https://doi.org/10.5066/P9VDTDSC.

Summary

Fine-grained sediment was collected from the banks of Napa River, Sonoma Creek, and tributaries in March 2018 and from shallow nearshore areas of the northern reach of San Francisco Bay in April 2018. Bulk sediment was dated using activities of short-lived cosmogenic radionuclides (beryllium-7, cesium-137, and lead-210). Contents of potentially toxic metals and source-rock-indicative elements, including rare earth elements, were quantified in the fine fraction of sediment (particles less than 0.063 mm diameter). Ratios of stable carbon-13/carbon-12 isotopes and total carbon to total nitrogen were determined in sedimentary organic matter.

Contacts

Attached Files

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SanFranciscoNorthBayWildfireStreamNearshoreSedimentGeochemistry2018_SampleMap.jpg
“Map showing sample locations”
thumbnail 463.1 KB
SanFranciscoNorthBayWildfireStreamNearshoreSedimentGeochemistry2018_data.csv
“Data table”
17.77 KB

Purpose

In October 2017, wildfires burned more than 100,000 acres of grassland, vineyards, and residential, urban, and mercury mining areas in Napa and Sonoma watersheds. Geochemical source-indicative signatures were identified in soil and sediment from tributary streams, Napa River, and Sonoma Creek in burned areas, and were used to explore terrestrial sediment and contaminant runoff and dispersal to shallow nearshore areas of north San Francisco Bay.

Additional Information

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DOI https://www.sciencebase.gov/vocab/category/item/identifier doi:10.5066/P9VDTDSC

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