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| griddap | Subset | tabledap | Make A Graph | wms | files | Accessible | Title | Summary | FGDC | ISO 19115 | Info | Background Info | RSS | Institution | Dataset ID | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_965250_v1 | https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_965250_v1.graph | https://erddap.bco-dmo.org/erddap/files/bcodmo_dataset_965250_v1/ | public | [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) | 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.\n\ncdm_data_type = Other\nVARIABLES:\nDate (unitless)\nTime_Local_PST (unitless)\nTime_UTC (unitless)\ntime (Iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)\nSite_Name (unitless)\nlatitude (degrees_north)\n... (16 more variables)\n | https://erddap.bco-dmo.org/erddap/metadata/fgdc/xml/bcodmo_dataset_965250_v1_fgdc.xml | https://erddap.bco-dmo.org/erddap/metadata/iso19115/xml/bcodmo_dataset_965250_v1_iso19115.xml | https://erddap.bco-dmo.org/erddap/info/bcodmo_dataset_965250_v1/index.htmlTable | https://osprey.bco-dmo.org/dataset/965250
| https://erddap.bco-dmo.org/erddap/rss/bcodmo_dataset_965250_v1.rss | https://erddap.bco-dmo.org/erddap/subscriptions/add.html?datasetID=bcodmo_dataset_965250_v1&showErrors=false&email= | BCO-DMO | bcodmo_dataset_965250_v1 | |||
| https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_646825.subset | https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_646825 | https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_646825.graph | https://erddap.bco-dmo.org/erddap/files/bcodmo_dataset_646825/ | public | [GN01 CTD - ODF Bottle] - Bottle data from the CTD-ODF carousel on the GEOTRACES Arctic Section cruise (HLY1502) from August to October 2015 (U.S. GEOTRACES Arctic project) (U.S. Arctic GEOTRACES Study) | Bottle data from the CTD-ODF carousel on the GEOTRACES Arctic Section cruise (HLY1502) from August to October 2015.\n\ncdm_data_type = Other\nVARIABLES:\ncruise_id (unitless)\nEXPOCODE (unitless)\nSECT_ID (unitless)\nSTNNBR (unitless)\nCASTNO (unitless)\nGEOTRC_EVENTNO (unitless)\nDATE (unitless)\ntime2 (TIME, unitless)\ntime (ISO Date Time UTC, seconds since 1970-01-01T00:00:00Z)\nlatitude (degrees_north)\nlongitude (degrees_east)\nGEOTRC_SAMPNO (unitless)\nSAMPNO (unitless)\nBTLNBR (unitless)\nBTLNBR_FLAG_W (unitless)\nDEPTH (meters (corrected))\nCTDPRS (decibars)\ndepth (CTDDEPTH, m)\nCTDTMP (degrees Celsius)\nCTDSAL (PSS-78)\nCTDSAL_FLAG_W (unitless)\nSALNTY (PSS-78)\nSALNTY_FLAG_W (unitless)\nSALTREF (Sea Water Practical Salinity, G/KG)\nSALTREF_FLAG_W (unitless)\nCTDOXY (UMOL/KG)\n... (34 more variables)\n | https://erddap.bco-dmo.org/erddap/metadata/fgdc/xml/bcodmo_dataset_646825_fgdc.xml | https://erddap.bco-dmo.org/erddap/info/bcodmo_dataset_646825/index.htmlTable | https://www.bco-dmo.org/dataset/646825
| https://erddap.bco-dmo.org/erddap/rss/bcodmo_dataset_646825.rss | https://erddap.bco-dmo.org/erddap/subscriptions/add.html?datasetID=bcodmo_dataset_646825&showErrors=false&email= | BCO-DMO | bcodmo_dataset_646825 | |||
| https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_986875_v1 | https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_986875_v1.graph | https://erddap.bco-dmo.org/erddap/files/bcodmo_dataset_986875_v1/ | public | [Water Column Methane Oxidation Gulf of Alaska] - Water column methane, methane oxidation, and pmoA gene copies above methane seeps determined from samples collected off the Aleutian Islands, Gulf of Alaska on R/V Atlantis cruise AT50-24 in May to June 2024 (Collaborative Research: Redefining the footprint of deep ocean methane seepage for benthic ecosystems) | Cold seeps along the eastern Aleutian subduction zone in the Gulf of Alaska fuel benthic ecosystems through microbial methane (CH₄) consumption, yet the structure and controls of water column CH₄ oxidation in these deep, cold waters remain poorly resolved. During a May–June 2024 expedition with the R/V Atlantis and HOV Alvin, we studied CH₄ and its bacterial oxidation from surface to seafloor above three deep seep sites (2000 to 5000 meters): Edge, Shumagin, and Sanak, by combining radiotracer incubations with pmoA gene profiling. CH₄ oxidation occurred throughout the water column, with peak rates (1 to 242 nanomoles per liter per day) in near-seafloor Alvin samples and 0.1 to 0.25 nanomoles per liter per day in CTD rosette samples 10 to 30 meters above bottom. Rates varied by site and depth. CH₄ oxidation in surface waters, coinciding with an algal bloom, suggests cryptic cycling via in situ production and consumption. A ~325-meter near-bottom CTD transect at Sanak revealed lateral gradients in CH₄ and oxidation aligned with bottom currents, with oxidation highest near hydrate-bearing gas vents and at the off-seep distal end. These findings show that aerobic CH₄ oxidation peaks near the seafloor to ~30 meters above but extends laterally and vertically beyond active seepage. Oxidation was detected even where methanotroph gene abundance was low, potentially indicating the influence of lateral CH₄ transport and tidal currents. The methanosphere thus emerges as a dynamic and spatially diffuse microbial system shaped by CH₄ availability and physical transport processes.\n\ncdm_data_type = Other\nVARIABLES:\nDate_UTC (unitless)\nCTD_Start_Time_or_Alvin_Niskin_Closure_UTC (unitless)\ntime (Iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)\nSite_Name (unitless)\nCTD_or_Alvin_Sample_Number (unitless)\nWaypoint (unitless)\nlatitude (degrees_north)\nlongitude (degrees_east)\nWater_Depth (meters below sea level (mbsl))\nMethane (nanomoles per liter (nmol L-1))\nMethane_oxidation_Replicate_1 (nanomoles per liter per day (nmol L-1 d-1))\nMethane_oxidation_Replicate_2 (nanomoles per liter per day (nmol L-1 d-1))\nMethane_oxidation_Replicate_3 (nanomoles per liter per day (nmol L-1 d-1))\npmoA_gene_copy_number (Log pmoA copies per liter)\n | https://erddap.bco-dmo.org/erddap/metadata/fgdc/xml/bcodmo_dataset_986875_v1_fgdc.xml | https://erddap.bco-dmo.org/erddap/metadata/iso19115/xml/bcodmo_dataset_986875_v1_iso19115.xml | https://erddap.bco-dmo.org/erddap/info/bcodmo_dataset_986875_v1/index.htmlTable | https://osprey.bco-dmo.org/dataset/986875
| https://erddap.bco-dmo.org/erddap/rss/bcodmo_dataset_986875_v1.rss | https://erddap.bco-dmo.org/erddap/subscriptions/add.html?datasetID=bcodmo_dataset_986875_v1&showErrors=false&email= | BCO-DMO | bcodmo_dataset_986875_v1 | |||
| https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_986866_v1 | https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_986866_v1.graph | https://erddap.bco-dmo.org/erddap/files/bcodmo_dataset_986866_v1/ | public | [Water column methane, methane oxidation, and pmoA gene copies] - Water column methane, methane oxidation, and pmoA gene copies above southern California methane seeps determined from samples collected on R/V Atlantis cruise AT50-12 in July 2023 (Collaborative Research: Redefining the footprint of deep ocean methane seepage for benthic ecosystems) | Marine methane (CH₄) seeps are dynamic biogeochemical systems that modulate carbon cycling and support high-biomass communities through microbial methane (CH₄) oxidation. While most CH₄ is consumed anaerobically in sediments, a fraction enters the water column, where aerobic methanotrophs form a biological filter limiting CH₄ flux to the atmosphere. However, the extent to which this microbial activity and CH₄ influence extend beyond visibly active seep zones remains poorly constrained, with implications for deep-sea food webs, biogeochemical gradients, and carbon cycling. We investigated CH₄ dynamics and methanotroph distribution across three seep sites on the Southern California margin (Del Mar, Santa Monica (800 meters) Mound, Lasuen Knoll; ~400–1200 meters depth). Using radiotracer (³H-CH₄) incubations, CH₄ concentration profiling, and particulate methane monooxygenase (pmoA) gene quantification, we sampled vertical and horizontal transects and near-bottom waters via the HOV Alvin. CH₄ oxidation was active not only within seep plumes but also in off-seep regions, with the highest rate (454 nanomoles per liter per day) observed within a CH₄-rich bubble plume. pmoA gene abundances remained relatively stable across both seep and off-seep waters, suggesting a persistent CH₄-oxidizing potential. These findings support an expanded \"methanosphere,\" a CH₄-influenced microbial zone shaped by physical transport and environmental gradients. This dataset is part of a PhD thesis: Klonicki-Ference, Emily F. \"Microbial Regulation of Methane and Redox Dynamics in the Water Column: From a Proterozoic Ocean Analog to Modern Marine Seeps.\" PhD diss., University of California, Los Angeles, 2025.\n\ncdm_data_type = Other\nVARIABLES:\nDate_UTC (unitless)\nCTD_Start_Time_or_Alvin_Niskin_Closure_UTC (unitless)\ntime (Iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)\nSite_Name (unitless)\nCTD_or_Alvin_Sample_Number (unitless)\nWaypoint (unitless)\nlatitude (degrees_north)\nlongitude (degrees_east)\nWater_Depth (meters below sea level (mbsl))\nMethane (nanomoles per liter (nmol L-1))\n... (4 more variables)\n | https://erddap.bco-dmo.org/erddap/metadata/fgdc/xml/bcodmo_dataset_986866_v1_fgdc.xml | https://erddap.bco-dmo.org/erddap/metadata/iso19115/xml/bcodmo_dataset_986866_v1_iso19115.xml | https://erddap.bco-dmo.org/erddap/info/bcodmo_dataset_986866_v1/index.htmlTable | https://osprey.bco-dmo.org/dataset/986866
| https://erddap.bco-dmo.org/erddap/rss/bcodmo_dataset_986866_v1.rss | https://erddap.bco-dmo.org/erddap/subscriptions/add.html?datasetID=bcodmo_dataset_986866_v1&showErrors=false&email= | BCO-DMO | bcodmo_dataset_986866_v1 |