BCO-DMO ERDDAP
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Row Type Variable Name Attribute Name Data Type Value
attribute NC_GLOBAL cdm_data_type String Other
attribute NC_GLOBAL Conventions String COARDS, CF-1.6, ACDD-1.3
attribute NC_GLOBAL creator_email String info at bco-dmo.org
attribute NC_GLOBAL creator_name String BCO-DMO
attribute NC_GLOBAL creator_url String https://www.bco-dmo.org/ (external link)
attribute NC_GLOBAL defaultDataQuery String &time<now
attribute NC_GLOBAL doi String 10.26008/1912/bco-dmo.965250.1
attribute NC_GLOBAL Easternmost_Easting double -119.5337
attribute NC_GLOBAL geospatial_lat_max double 34.40351
attribute NC_GLOBAL geospatial_lat_min double 34.39873
attribute NC_GLOBAL geospatial_lat_units String degrees_north
attribute NC_GLOBAL geospatial_lon_max double -119.5337
attribute NC_GLOBAL geospatial_lon_min double -119.5367
attribute NC_GLOBAL geospatial_lon_units String degrees_east
attribute NC_GLOBAL infoUrl String https://osprey.bco-dmo.org/dataset/965250 (external link)
attribute NC_GLOBAL institution String BCO-DMO
attribute NC_GLOBAL license String The data may be used and redistributed for free but is not intended\nfor legal use, since it may contain inaccuracies. Neither the data\nContributor, ERD, NOAA, nor the United States Government, nor any\nof their employees or contractors, makes any warranty, express or\nimplied, including warranties of merchantability and fitness for a\nparticular purpose, or assumes any legal liability for the accuracy,\ncompleteness, or usefulness, of this information.
attribute NC_GLOBAL Northernmost_Northing double 34.40351
attribute NC_GLOBAL sourceUrl String (local files)
attribute NC_GLOBAL Southernmost_Northing double 34.39873
attribute NC_GLOBAL summary String Methylotrophic methanogenesis occurring within sulfate-rich zones of coastal and marine sediments is functionally linked to anaerobic methane oxidation (AOM), together constituting a cryptic methane cycle. This investigation presents data on such cryptic methane cycling across a land-to-sea transect comprising four sampling sites within the Carpinteria Salt Marsh Reserve (CSMR) in southern California, USA: two brackish, one marine, and one hypersaline. Surface sediments (upper 20 cm) were examined using geochemical profiling and radiotracer incubation experiments employing 35S-labeled sulfate, 14C-labeled monomethylamine, and 14C-labeled methane.\n \nMethane concentrations in sediment porewater were generally low (3–28 µM) across all sites, except at the marine station, where levels increased with depth, reaching up to 665 µM. Methane production from monomethylamine was detected throughout the depth profiles at all stations, with estimated rates ranging from sub-nanomolar to nanomolar per cubic centimeter of sediment per day. AOM, quantified via 14C-CH₄ tracer, co-occurred with methylotrophic methanogenesis at each station, exhibiting activity levels between 0.03 and 19.4 nmol cm⁻³ d⁻¹.\n \nPorewater chemistry revealed elevated concentrations of sulfate and dissolved iron across all sites. Sulfate levels (9–91 mM) remained sufficiently high to support sulfate reduction, which showed activity levels from 1.5 to 2,506 nmol cm⁻³ d⁻¹. Vertical profiles of sulfide and Fe(II) suggested a geochemical shift along the transect—from iron-dominated reduction at the brackish stations to sulfate-dominated reduction at the marine and hypersaline stations. AOM activity overlapped with zones of sulfate reduction and Fe(II) enrichment, indicating that methane oxidation may be coupled to both sulfate and iron reduction across all sampling locations.
attribute NC_GLOBAL time_coverage_end String 2019-07-09T16:00:00Z
attribute NC_GLOBAL time_coverage_start String 2019-07-09T16:00:00Z
attribute NC_GLOBAL title String [Cryptic CH4 Cycling] - Biogeochemical data on cryptic methane cycling in hypersaline sediments of the Carpinteria Salt Marsh Reserve, California from sampling in 2019 (Deciphering the Cryptic Cycling of Methane in Sediments of a Coastal Wetland)
attribute NC_GLOBAL Westernmost_Easting double -119.5367
variable Date String
attribute Date long_name String Date
attribute Date units String unitless
variable Time_Local_PST String
attribute Time_Local_PST long_name String Time_local_pst
attribute Time_Local_PST units String unitless
variable Time_UTC String
attribute Time_UTC long_name String Time_utc
attribute Time_UTC units String unitless
variable time double
attribute time _CoordinateAxisType String Time
attribute time actual_range double 1.562688E9, 1.562688E9
attribute time axis String T
attribute time ioos_category String Time
attribute time long_name String Iso_datetime_utc
attribute time standard_name String time
attribute time time_origin String 01-JAN-1970 00:00:00
attribute time units String seconds since 1970-01-01T00:00:00Z
variable Site_Name String
attribute Site_Name long_name String Site_name
attribute Site_Name units String unitless
variable latitude float
attribute latitude _CoordinateAxisType String Lat
attribute latitude actual_range float 34.39873, 34.40351
attribute latitude axis String Y
attribute latitude ioos_category String Location
attribute latitude long_name String Latitude
attribute latitude standard_name String latitude
attribute latitude units String degrees_north
variable longitude float
attribute longitude _CoordinateAxisType String Lon
attribute longitude actual_range float -119.5367, -119.5337
attribute longitude axis String X
attribute longitude ioos_category String Location
attribute longitude long_name String Longitude
attribute longitude standard_name String longitude
attribute longitude units String degrees_east
variable Pushcore_Inner_Diameter float
attribute Pushcore_Inner_Diameter actual_range float 2.6, 10.0
attribute Pushcore_Inner_Diameter long_name String Pushcore_inner_diameter
attribute Pushcore_Inner_Diameter units String centimeters (cm)
variable Sediment_Depth float
attribute Sediment_Depth actual_range float 0.5, 20.0
attribute Sediment_Depth long_name String Sediment_depth
attribute Sediment_Depth units String centimeters (cm)
variable Porewater_Sulfate float
attribute Porewater_Sulfate actual_range float 0.1526972, 90.90136
attribute Porewater_Sulfate long_name String Porewater_sulfate
attribute Porewater_Sulfate units String millimolar (mM, mmol L-1)
variable Salinity float
attribute Salinity actual_range float 0.02125121, 139.0644
attribute Salinity long_name String Salinity
attribute Salinity units String Practical Salinity Units (PSU)
variable Porewater_Iron_II float
attribute Porewater_Iron_II actual_range float 6.250774, 1660.747
attribute Porewater_Iron_II long_name String Porewater_iron_ii
attribute Porewater_Iron_II units String micromoles per liter (umol L-1)
variable Porewater_Sulfide float
attribute Porewater_Sulfide actual_range float 0.5085579, 85.88122
attribute Porewater_Sulfide long_name String Porewater_sulfide
attribute Porewater_Sulfide units String micromoles per liter (umol L-1)
variable Porosity float
attribute Porosity actual_range float 0.27375, 0.78875
attribute Porosity long_name String Porosity
attribute Porosity units String volume of void-space over total volume (v/v)
variable Methane float
attribute Methane actual_range float 6.161057, 665.3074
attribute Methane long_name String Methane
attribute Methane units String micromoles per liter (umol L-1)
variable Sulfate_Reduction float
attribute Sulfate_Reduction actual_range float 0.0, 2506.567
attribute Sulfate_Reduction long_name String Sulfate_reduction
attribute Sulfate_Reduction units String nanomoles per cubic centimeter per day (nmol cm-3 d-1)
variable AOM_CH4 float
attribute AOM_CH4 actual_range float 0.0, 19.8006
attribute AOM_CH4 long_name String Aom_ch4
attribute AOM_CH4 units String nanomoles per cubic centimeter per day (nmol cm-3 d-1)
variable AOM_MMA float
attribute AOM_MMA actual_range float 0.0, 45.21321
attribute AOM_MMA long_name String Aom_mma
attribute AOM_MMA units String nanomoles per cubic centimeter per day (nmol cm-3 d-1)
variable MG_MMA float
attribute MG_MMA actual_range float 0.05508547, 3.81705
attribute MG_MMA long_name String Mg_mma
attribute MG_MMA units String nanomoles per cubic centimeter per day (nmol cm-3 d-1)
variable AOM_CH4_k float
attribute AOM_CH4_k actual_range float 0.0, 0.3037158
attribute AOM_CH4_k long_name String Aom_ch4_k
attribute AOM_CH4_k units String per day (d-1)
variable AOM_MMA_k float
attribute AOM_MMA_k actual_range float 0.0, 0.9550703
attribute AOM_MMA_k long_name String Aom_mma_k
attribute AOM_MMA_k units String per day (d-1)
variable MG_MMA_k float
attribute MG_MMA_k actual_range float 0.01836182, 1.27235
attribute MG_MMA_k long_name String Mg_mma_k
attribute MG_MMA_k units String per day (d-1)

 
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