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.986875.1
attribute NC_GLOBAL Easternmost_Easting double -147.9998
attribute NC_GLOBAL geospatial_lat_max double 57.4803
attribute NC_GLOBAL geospatial_lat_min double 53.74744
attribute NC_GLOBAL geospatial_lat_units String degrees_north
attribute NC_GLOBAL geospatial_lon_max double -147.9998
attribute NC_GLOBAL geospatial_lon_min double -162.5903
attribute NC_GLOBAL geospatial_lon_units String degrees_east
attribute NC_GLOBAL infoUrl String https://osprey.bco-dmo.org/dataset/986875 (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 57.4803
attribute NC_GLOBAL sourceUrl String (local files)
attribute NC_GLOBAL Southernmost_Northing double 53.74744
attribute NC_GLOBAL summary String 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.
attribute NC_GLOBAL time_coverage_end String 2024-06-05T21:55:00Z
attribute NC_GLOBAL time_coverage_start String 2024-05-17T05:12:00Z
attribute NC_GLOBAL title String [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)
attribute NC_GLOBAL Westernmost_Easting double -162.5903
variable Date_UTC String
attribute Date_UTC long_name String Date_utc
attribute Date_UTC units String unitless
variable CTD_Start_Time_or_Alvin_Niskin_Closure_UTC String
attribute CTD_Start_Time_or_Alvin_Niskin_Closure_UTC long_name String Ctd_start_time_or_alvin_niskin_closure_utc
attribute CTD_Start_Time_or_Alvin_Niskin_Closure_UTC units String unitless
variable time double
attribute time _CoordinateAxisType String Time
attribute time actual_range double 1.71592272E9, 1.7176245E9
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 CTD_or_Alvin_Sample_Number String
attribute CTD_or_Alvin_Sample_Number long_name String Ctd_or_alvin_sample_number
attribute CTD_or_Alvin_Sample_Number units String unitless
variable Waypoint int
attribute Waypoint actual_range int 1, 9
attribute Waypoint long_name String Waypoint
attribute Waypoint units String unitless
variable latitude float
attribute latitude _CoordinateAxisType String Lat
attribute latitude actual_range float 53.74744, 57.4803
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 -162.5903, -147.9998
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 Water_Depth float
attribute Water_Depth actual_range float 11.0, 4960.0
attribute Water_Depth long_name String Water_depth
attribute Water_Depth units String meters below sea level (mbsl)
variable Methane float
attribute Methane actual_range float 4.2, 22051.0
attribute Methane long_name String Methane
attribute Methane units String nanomoles per liter (nmol L-1)
variable Methane_oxidation_Replicate_1 float
attribute Methane_oxidation_Replicate_1 actual_range float 0.0, 240.0
attribute Methane_oxidation_Replicate_1 long_name String Methane_oxidation_replicate_1
attribute Methane_oxidation_Replicate_1 units String nanomoles per liter per day (nmol L-1 d-1)
variable Methane_oxidation_Replicate_2 float
attribute Methane_oxidation_Replicate_2 actual_range float 0.0, 243.0
attribute Methane_oxidation_Replicate_2 long_name String Methane_oxidation_replicate_2
attribute Methane_oxidation_Replicate_2 units String nanomoles per liter per day (nmol L-1 d-1)
variable Methane_oxidation_Replicate_3 float
attribute Methane_oxidation_Replicate_3 actual_range float 0.0, 13.309
attribute Methane_oxidation_Replicate_3 long_name String Methane_oxidation_replicate_3
attribute Methane_oxidation_Replicate_3 units String nanomoles per liter per day (nmol L-1 d-1)
variable pmoA_gene_copy_number float
attribute pmoA_gene_copy_number actual_range float 0.1, 6.86
attribute pmoA_gene_copy_number long_name String Pmoa_gene_copy_number
attribute pmoA_gene_copy_number units String Log pmoA copies per liter

 
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