This dataset contains soil organic matter and soil dry bulk density for 435 tidal marsh surface samples and 39 sediment cores ranging 1-2 m collected from 19 sites across the Northeast United States. Samples were collected in transects away from tidal creeks to characterize spatial patterns in marsh soil properties.

Resources in this dataset:

• Resource Title: Northeast tidal marsh surface sample organic fraction and dry bulk density
  File Name: UMass-NRCS_blue_carbon_surface_samples.csv
  Resource Description: This dataset contains blue carbon information for 435 surface samples from 19 sites along the Northeast US coastline in the states of New York, Connecticut, Massachusetts, New Hampshire, and Maine. Samples are representative of the top 10 cm, which represent roughly 25 years of sediment accumulation between 1995 and 2020.

• Resource Title: UMass Northeast US tidal marsh down core bulk density
  File Name: UMass_BlueCarbonCores_BD.csv
  Resource Description: Sediment core depth series with bulk density for 15.5 cm^3 subsamples corresponding to the listed starting and ending depths.

• Resource Title: UMass Northeast US tidal marsh down core LOI
  File Name: UMass_BlueCarbonCores_LOI.csv
  Resource Description: Sediment core depth series with LOI for 1 cm subsamples corresponding to the listed starting and ending depths.

• Resource Title: UMass Northeast US tidal marsh sediment core locations
  File Name: UMass_sediment_core_locations.csv
  Resource Description: Locations of sediment cores listed in LOI and BD depth series. Locations and elevations were obtained with RTK GPS, except where “GPS_method” notes that a handheld GPS was used.

• Resource Title: README file for UMass-NRCS collaborative project mapping blue carbon across the Northeast US
  File Name: README_Northeast_blue_carbon.txt
  Resource Description: This readme file provides metadata for associated resources in this data archive, including sampling protocols, lab analyses, and locations of sediment cores.