Data · dataset
[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)
Listed in Biological and Chemical Oceanography Data Management Office (BCO-DMO) ERDDAP
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.
Description
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.
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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.
Links
Where it is published
- ERDDAP dataset info erddap.bco-dmo.org/erddap/info/bcodmo_dataset_986875_v1/index.html ↗
landing page · from erddap bco dmo org
Documentation and papers
- Dataset documentation osprey.bco-dmo.org/dataset/986875 ↗
documentation · from erddap bco dmo org
Catalogue records · 1
- ERDDAP tabledap access form erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_986875_v1.html ↗
metadata API · from erddap bco dmo org
Topics
- From keywords
- Ocean & Atmospheric Science
Provenance · 1 source records, 6 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| Biological and Chemical Oceanography Data Management Office (BCO-DMO) ERDDAP | bcodmo_dataset_986875_v1 | 15 h ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · erddap bco dmo org | connector:erddap_bco_dmo_org@1.0.0 | |
| concepts[field].local:field:ocean-atmospheric | mapping · erddap bco dmo org | connector:erddap_bco_dmo_org@1.0.0 | |
| description | source · erddap bco dmo org | connector:erddap_bco_dmo_org@1.0.0 | /summary |
| spatial | source · erddap bco dmo org | connector:erddap_bco_dmo_org@1.0.0 | |
| temporal | source · erddap bco dmo org | connector:erddap_bco_dmo_org@1.0.0 | |
| title | source · erddap bco dmo org | connector:erddap_bco_dmo_org@1.0.0 | /title |