This data release includes carbon stocks and sequestration rates for seagrass meadows and natural and restored tidal marshes in the Pacific Northwest US. Our studies have 1) estimated organic carbon stocks and sequestration rates for a Z. marina meadow in Padilla Bay, a National Estuarine Research Reserve in Washington, 2) conducted a blue C assessment of restored and natural tidal marshes in the Stillaguamish River estuary in Puget Sound, Washington, and 3) provided an assessment of carbon stocks and sequestration rates from 12 sites across the Snohomish estuary, representing emergent tidal wetland, forested tidal wetland, regenerating emergent wetland, and drained wetland in the Pacific Northwest US. Sediment accretion and carbon accumulation rates were determined with radiometric dating.
| Start date | End date |
|---|---|
| 2012 | 2019 |
| Rank name | Value |
|---|---|
| Species | Zostera marina |
| Species | Carex lyngbyei |
| Species | Distichlis spicata |
| Species | Juncus balticus |
| Species | Potentilla anserina |
| Species | Agrostis stolonifera |
| Species | Bolboschoenus maritimus |
| Species | Schoenoplectus americanus |
| Species | Triglochin maritima |
| Species | Symphyotrichum subspicatum |
| Species | Deschampsia cespitosa |
| Species | Schoenoplectus tabernaemontanii |
| Species | Cotula coronopifolia |
| Species | Lolium perenne |
| Species | Bolboschoenus fluviatilis |
| Species | Typha latifolia |
| Species | Typha angustifolia |
| Species | Eleocharis palustris |
| Species | Spergularia canadensis |
| Species | Rosa pisocarpa |
| Species | Rosa nutkana |
| Species | Lonicera involucrata |
| Species | Schoenoplectus tabernaemontani |
| Species | Oenanthe sarmentosa |
| Species | Phalaris arundinacea |
| Species | Athyrium filix-femina |
| Species | Lysichiton americanus |
| Species | Thuja plicata |
| Species | Prunus emarginata |
| Species | Rubus spectabilis |
| Species | Spiraea douglasii |
| Species | Agrostis sp. |
| attribute name | definition | format, unit or codes |
|---|---|---|
| study_id | Unique identifier for the study made up of the first author's family name, as well as the second author's or 'et al.' if more than three, then publication year spearated by underscores. See worksCited.bib for more detail. | |
| coring_method | Code indicating what type of device was used to collect soil depth profiles. | pvc and hammer = PVC pipe was driven into the sediment with a hammer to recover a core |
| roots_flag | Code indicating whether live roots were included or excluded from carbon assessments. | roots and rhizomes included = Roots and rhizomes were included in dry bulk density and or organic matter and carbon measurements |
| sediment_sieved_flag | Code indicating whether or not sediment was sieved prior to carbon measurements. | sediment sieved = Sediment was sieved prior to analysis for organics |
| sediment_sieve_size | If sediment was sieved, the size of sieve used. | millimeter |
| compaction_flag | Code indicating how the authors qualified or quantified compaction of the core. | no obvious compaction = Authors observed no obvious compaction |
| dry_bulk_density_temperature | Temperature at which samples were dried to measure dry bulk density. This can include either samples that were freeze dried or oven dried. | celsius |
| dry_bulk_density_time | Time over which samples were dried to measure dry bulk density. | hour |
| dry_bulk_density_flag | Any notable codes regarding how the authors quantified dry bulk density. | to constant mass = Bulk density methodology did not specify drying temperature or length, only that samples were dried to a constant mass |
| loss_on_ignition_temperature | Temperature at which samples were combusted to estimate fraction organic matter. | celsius |
| loss_on_ignition_time | Time over which samples were combusted to estimate fraction organic matter. | hour |
| carbonates_removed | Whether or not carbonates were removed prior to calculating fraction organic carbon. | FALSE = Carbonates were not removed before measuring organic carbon |
| fraction_carbon_method | Code indicating the method for which fraction carbon was measured or modeled (Note: regression based models are permitted, but the use of the Bemmelen factor [0.58 gOC gOM-1] is discouraged). | local regression = A regression model fit using a subset of measurements was used to predict fraction carbon as a function of fraction organic matter not specified = No additional details were provided regarding fraction carbon methodologies |
| fraction_carbon_type | Code indicating whether fraction_carbon refers to organic or total carbon. | organic carbon = Author specified that fraction carbon measurements were of organic carbon |
| cs137_counting_method | Code indicating the method used for determining radiocesium activity. | gamma = Gamma counting method used. |
| pb210_counting_method | Code indicating the method used for determining lead 210 activity. | gamma = Gamma counting method used. |
| attribute name | definition | format, unit or codes |
|---|---|---|
| site_id | Site identification code unique to each study. | |
| study_id | Unique identifier for the study made up of the first author's family name, as well as the second author's or 'et al.' if more than three, then publication year spearated by underscores. See worksCited.bib for more detail. | |
| site_description | Site description including relevant study details and political geographic units. Some of these descriptions can be automated by the ingestion code. | |
| salinity_class | Code based on submitter field observation or measurement indicating average annual salinity (Note: Palustrine and freshwater should only include tidal wetlands, or wetlands that are potentially/formerly tidal but artificially freshened due to artificial tidal restrictions). | saline = 30-50 ppt brackish = 0.5-30 ppt estuarine = 0.5-35 ppt according to most definitions riverine = Predominantly freshwater input from rivers |
| salinity_method | Indicate whether salinity_class was determined using a field observation or a measurement | measurement = Salinity observed from local instrument. |
| vegetation_class | Code based on submitter field observations or measurement indicating dominant wetland vegetation type. | emergent = Describes wetlands dominated by persistent emergent vascular plants forested = Describes wetlands dominated by woody vegetation > 5 meters in height seagrass = Describes tidal or subtidal communities dominated by rooted vascular plants. unvegetated = Describes wetlands with no or very little vegetation (such as mud flats) |
| vegetation_method | Indicate whether vegetation_class was determined using a field observation or a measurement | measurement = Vegetation measured by counts or plots. |
| inundation_class | Code based on submitter field observation or measurement indicating how often the coring location is inundated. | high = Study-specific definition of an elevation relatively high in the tidal frame, typically defined by vegetation type low = Study-specific definition of an elevation in relatively low in the tidal frame, typically defined by vegetation type |
| inundation_method | Indicate whether inundation_class was determined using a field observation or a measurement | field observation = Inundation inferred by field observation such as vegetation measurement = Inundation class assessed from elevation and nearby tide gauge or other similar method. |
| site_longitude_max | Maximum longitude defining a bounding box for the site in decimal degree WGS84. This can also be generated automatically by the ingestion code. | degree |
| site_longitude_min | Minimum longitude defining a bounding box for the site in decimal degree WGS84. This can also be generated automatically by the ingestion code. | degree |
| site_latitude_max | Maximum latitude defining a bounding box for the site in decimal degree World Geodedic System of 1984 (WGS84). This can also be generated automatically by the ingestion code. | degree |
| site_latitude_min | Minimum latitude defining a bounding box for the site in decimal degree WGS84. This can also be generated automatically by the ingestion code. | degree |
| estuary_id | Estuary associated with the site and/or core |
| attribute name | definition | format, unit or codes |
|---|---|---|
| study_id | Unique identifier for the study made up of the first author's family name, as well as the second author's or 'et al.' if more than three, then publication year spearated by underscores. See worksCited.bib for more detail. | |
| estuary_id | Estuary associated with the site and/or core | |
| site_id | Site identification code unique to each study. | |
| core_id | Core identification code unique to each site. | |
| core_date | Date of core collection. | YYYY-MM-DD |
| core_latitude | Positional latitude of the core in decimal degree WGS84. | degree |
| core_longitude | Positional longitude of the core in decimal degree WGS84. | degree |
| core_position_method | Code indicating how latitude and longitude were determined. | RTK-GPS = Real-time kinematic global position system (GPS) |
| core_position_notes | Any relevant submitter generated notes on how latitude and longitude were determined. | |
| core_elevation | Surface elevation of the core relative to defined datum. | meter |
| core_elevation_datum | The datum relative to which the core elevation was measured against (For a complete list of datum names and aliases please refer to the ISO Geodedic Registry https://iso.registry.bespire.eu/register/geodetic/VerticalDatum). | NAVD88 = A gravity-based geodetic datum, North American Vertical Datum of 1988 |
| core_elevation_method | Code indicating how elevation was determined | RTK-GPS = Real-time kinematic global position system (GPS) |
| core_elevation_notes | Any relevant submitter generated notes on how elevation was determined | |
| salinity_class | Code based on submitter field observation or measurement indicating average annual salinity (Note: Palustrine and freshwater should only include tidal wetlands, or wetlands that are potentially/formerly tidal but artificially freshened due to artificial tidal restrictions). | saline = 30-50 ppt brackish = 0.5-30 ppt estuarine = 0.5-35 ppt according to most definitions riverine = Predominantly freshwater input from rivers |
| salinity_method | Indicate whether salinity_class was determined using a field observation or a measurement | measurement = Salinity observed from local instrument. |
| vegetation_class | Code based on submitter field observations or measurement indicating dominant wetland vegetation type. | emergent = Describes wetlands dominated by persistent emergent vascular plants forested = Describes wetlands dominated by woody vegetation > 5 meters in height seagrass = Describes tidal or subtidal communities dominated by rooted vascular plants. unvegetated = Describes wetlands with no or very little vegetation (such as mud flats) |
| vegetation_method | Indicate whether vegetation_class was determined using a field observation or a measurement | measurement = Vegetation measured by counts or plots. |
| inundation_class | Code based on submitter field observation or measurement indicating how often the coring location is inundated. | high = Study-specific definition of an elevation relatively high in the tidal frame, typically defined by vegetation type low = Study-specific definition of an elevation in relatively low in the tidal frame, typically defined by vegetation type |
| inundation_method | Indicate whether inundation_class was determined using a field observation or a measurement | measurement = Inundation class assessed from elevation and nearby tide gauge or other similar method. |
| core_length_flag | Indicated whether or not the coring team believes they recovered a full sediment profile, down to bedrock, or other non-marsh interface. | core depth limited by length of corer = The total depth of the core was limited by the length of the coring device |
| attribute name | definition | format, unit or codes |
|---|---|---|
| study_id | Unique identifier for the study made up of the first author's family name, as well as the second author's or 'et al.' if more than three, then publication year spearated by underscores. See worksCited.bib for more detail. | |
| estuary_id | Estuary associated with the site and/or core | |
| site_id | Site identification code unique to each study. | |
| core_id | Core identification code unique to each site. | |
| depth_min | Minimum depth of a sampling increment. | centimeter |
| depth_max | Maximum depth of a sampling increment. | centimeter |
| dry_bulk_density | Dry mass per unit volume of a soil sample. This does not include ash free bulk density. | gramsPerCubicCentimeter |
| fraction_organic_matter | Mass of organic matter relative to sample dry mass. Ash free bulk density should not be used here but should be expressed as a loss on ignition fraction. | dimensionless |
| fraction_carbon_measured | Measured mass of carbon relative to sample dry mass. | dimensionless |
| fraction_carbon_modeled | Modeled mass of carbon relative to sample dry mass. | dimensionless |
| cs137_activity | Radioactivity counts per unit dry weight for radiocesium (137Cs). | becquerelsPerKilogram |
| total_pb210_activity | Total radioactivity counts per unit dry weight for excess lead 210 (210Pb). | becquerelsPerKilogram |
| total_pb210_activity_sd | 1 standard deviation of uncertainty associated with total_pb210_activity. | becquerelsPerKilogram |
| excess_pb210_activity | Excess radioactivity counts per unit dry weight for excess lead 210 (210Pb). | becquerelsPerKilogram |
| excess_pb210_activity_sd | 1 standard deviation of uncertainty associated with excess_pb210_activity. | becquerelsPerKilogram |
| pb214_activity | Radioactivity counts per unit dry weight for lead 214 (214Pb) at 352 keV | becquerelsPerKilogram |
| pb214_activity_sd | 1 standard deviation of uncertainty associated with pb214_activity at 352 keV. | becquerelsPerKilogram |
| depth_interval_notes | Any other submitter generated notes specific to the depth interval. |
| attribute name | definition | format, unit or codes |
|---|---|---|
| study_id | Unique identifier for the study made up of the first author's family name, as well as the second author's or 'et al.' if more than three, then publication year spearated by underscores. See worksCited.bib for more detail. | |
| estuary_id | Estuary associated with the site and/or core | |
| site_id | Site identification code unique to each study. | |
| core_id | Core identification code unique to each site. | |
| impact_class | Code indicating any major anthropogenic impacts historically and currently affecting the coring location. | diked and drained = The wetland has been diked and drained, with or without flapper gates, pumping, or other means tidally restored = Tidal flow has been restored by removing an artificial obstruction |
| unit name | parent SI unit | unit type | description |
|---|---|---|---|
| cubicCentimeter | cubicMeter | volume | cubic centimeter |
| becquerelsPerKilogram | radionucleotideActivityPerMass | becquerels per kilogram |
This dataset is listed under a Creative Commons BY 4.0 and can be used with attribution. https://creativecommons.org/licenses/by/4.0/