Accessing BCO-DMO data
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BCO-DMO ERDDAP
Accessing BCO-DMO data |
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| Dataset Title: | [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) 
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| Institution: | BCO-DMO (Dataset ID: bcodmo_dataset_986875_v1) |
| Information: | Summary
| License
| FGDC
| ISO 19115
| Metadata
| Background
| Files
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Attributes {
s {
Date_UTC {
String long_name "Date_utc";
String units "unitless";
}
CTD_Start_Time_or_Alvin_Niskin_Closure_UTC {
String long_name "Ctd_start_time_or_alvin_niskin_closure_utc";
String units "unitless";
}
time {
String _CoordinateAxisType "Time";
Float64 actual_range 1.71592272e+9, 1.7176245e+9;
String axis "T";
String ioos_category "Time";
String long_name "Iso_datetime_utc";
String standard_name "time";
String time_origin "01-JAN-1970 00:00:00";
String units "seconds since 1970-01-01T00:00:00Z";
}
Site_Name {
String long_name "Site_name";
String units "unitless";
}
CTD_or_Alvin_Sample_Number {
String long_name "Ctd_or_alvin_sample_number";
String units "unitless";
}
Waypoint {
Int32 actual_range 1, 9;
String long_name "Waypoint";
String units "unitless";
}
latitude {
String _CoordinateAxisType "Lat";
Float32 actual_range 53.74744, 57.4803;
String axis "Y";
String ioos_category "Location";
String long_name "Latitude";
String standard_name "latitude";
String units "degrees_north";
}
longitude {
String _CoordinateAxisType "Lon";
Float32 actual_range -162.5903, -147.9998;
String axis "X";
String ioos_category "Location";
String long_name "Longitude";
String standard_name "longitude";
String units "degrees_east";
}
Water_Depth {
Float32 actual_range 11.0, 4960.0;
String long_name "Water_depth";
String units "meters below sea level (mbsl)";
}
Methane {
Float32 actual_range 4.2, 22051.0;
String long_name "Methane";
String units "nanomoles per liter (nmol L-1)";
}
Methane_oxidation_Replicate_1 {
Float32 actual_range 0.0, 240.0;
String long_name "Methane_oxidation_replicate_1";
String units "nanomoles per liter per day (nmol L-1 d-1)";
}
Methane_oxidation_Replicate_2 {
Float32 actual_range 0.0, 243.0;
String long_name "Methane_oxidation_replicate_2";
String units "nanomoles per liter per day (nmol L-1 d-1)";
}
Methane_oxidation_Replicate_3 {
Float32 actual_range 0.0, 13.309;
String long_name "Methane_oxidation_replicate_3";
String units "nanomoles per liter per day (nmol L-1 d-1)";
}
pmoA_gene_copy_number {
Float32 actual_range 0.1, 6.86;
String long_name "Pmoa_gene_copy_number";
String units "Log pmoA copies per liter";
}
}
NC_GLOBAL {
String cdm_data_type "Other";
String Conventions "COARDS, CF-1.6, ACDD-1.3";
String creator_email "info@bco-dmo.org";
String creator_name "BCO-DMO";
String creator_url "https://www.bco-dmo.org/";
String defaultDataQuery "&time<now";
String doi "10.26008/1912/bco-dmo.986875.1";
Float64 Easternmost_Easting -147.9998;
Float64 geospatial_lat_max 57.4803;
Float64 geospatial_lat_min 53.74744;
String geospatial_lat_units "degrees_north";
Float64 geospatial_lon_max -147.9998;
Float64 geospatial_lon_min -162.5903;
String geospatial_lon_units "degrees_east";
String history
"2026-04-08T22:33:38Z (local files)
2026-04-08T22:33:38Z https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_986875_v1.html";
String infoUrl "https://osprey.bco-dmo.org/dataset/986875";
String institution "BCO-DMO";
String license
"The data may be used and redistributed for free but is not intended
for legal use, since it may contain inaccuracies. Neither the data
Contributor, ERD, NOAA, nor the United States Government, nor any
of their employees or contractors, makes any warranty, express or
implied, including warranties of merchantability and fitness for a
particular purpose, or assumes any legal liability for the accuracy,
completeness, or usefulness, of this information.";
Float64 Northernmost_Northing 57.4803;
String sourceUrl "(local files)";
Float64 Southernmost_Northing 53.74744;
String summary "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.";
String time_coverage_end "2024-06-05T21:55:00Z";
String time_coverage_start "2024-05-17T05:12:00Z";
String title "[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)";
Float64 Westernmost_Easting -162.5903;
}
}
Data Access Protocol (DAP) and its
selection constraints.
The URL specifies what you want: the dataset, a description of the graph or the subset of the data, and the file type for the response.
Tabledap request URLs must be in the form
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/datasetID.fileType{?query}
For example,
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/pmelTaoDySst.htmlTable?longitude,latitude,time,station,wmo_platform_code,T_25&time>=2015-05-23T12:00:00Z&time<=2015-05-31T12:00:00Z
Thus, the query is often a comma-separated list of desired variable names,
followed by a collection of
constraints (e.g., variable<value),
each preceded by '&' (which is interpreted as "AND").
For details, see the tabledap Documentation.