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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_923859_v1 | https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_923859_v1.graph | https://erddap.bco-dmo.org/erddap/files/bcodmo_dataset_923859_v1/ | public | [The influence of reactive oxygen species on \"‘respiration\" isotope effect] - The influence of reactive oxygen species on \"‘respiration\" isotope effect (Clumped Oxygen Isotope Signature of Marine Dissolved Oxygen) | The triple-oxygen isotope (17O/16O, 18O/16O) measurement of oxygen-bearing species represents one of the most robust tools to directly trace oxygen cycling in the environment. One particularly consequential application of this isotope system is the analysis of dissolved oxygen (O2) in aquatic environments to determine gross oxygen production. This approach assumes that photosynthesis, microbial respiration, and gas exchange are the main drivers of dissolved O2 isotope compositions, and that each process is described by predictable, consistent triple-oxygen isotope effects. However, there currently exists a large disagreement in the literature on the triple-oxygen isotope effect of respiration, which carries major implications for global primary productivity estimates. Recent work has additionally highlighted the ubiquitous production of extracellular reactive oxygen species (ROS) such as superoxide and hydrogen peroxide by microorganisms; this flux maybe responsible for as much as 20% of net oxygen utilization in the ocean. \n\nTo examine the influence of ROS-mediated O2 recycling on the oxygen utilization isotope effect, we measured the triple-oxygen isotope fractionations and mass laws of superoxide dismutase, catalase, and iron-mediated H2O2 degradation. We incorporate these constraints into an oxygen isotope flux model to explore the influence of ROS-mediated oxygen cycling on \"respiration\" isotope effects in previous studies. We find that ROS-mediated oxygen cycling can reconcile the previously reported range of triple-oxygen isotope fractionation factors and that typical marine isotope effects are broadly consistent with independent estimates of superoxide-mediated oxygen loss. These data are described further in the related publication, Sutherland et al., 2022 (doi: 10.1016/j.gca.2022.02.033).\n\ncdm_data_type = Other\nVARIABLES:\nSample (unitless)\nn (unitless)\nd18O_smowslap (permil)\nD17O (permil)\nd17O_smowslap_log (unitless)\nd18O_smowslap_log (unitless)\n | https://erddap.bco-dmo.org/erddap/info/bcodmo_dataset_923859_v1/index.htmlTable | https://osprey.bco-dmo.org/dataset/923859
| https://erddap.bco-dmo.org/erddap/rss/bcodmo_dataset_923859_v1.rss | https://erddap.bco-dmo.org/erddap/subscriptions/add.html?datasetID=bcodmo_dataset_923859_v1&showErrors=false&email= | BCO-DMO | bcodmo_dataset_923859_v1 | |||||
| https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_923821_v1 | https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_923821_v1.graph | https://erddap.bco-dmo.org/erddap/files/bcodmo_dataset_923821_v1/ | public | [Triple oxygen isotopes of respiration and photo-oxidation of DOC] - Triple oxygen isotopes of respiration and photo-oxidation of DOC (Clumped Oxygen Isotope Signature of Marine Dissolved Oxygen) | The biogeochemical fluxes that cycle oxygen (O2) play a critical role in regulating Earth's climate and habitability. Triple-oxygen isotope (TOI) compositions of marine dissolved O2 are considered a robust tool for tracing oxygen cycling and quantifying gross photosynthetic O2 production. This method assumes that photosynthesis, microbial respiration, and gas exchange with the atmosphere are the primary influences on dissolved O2 content, and that they have predictable, fixed isotope effects. Despite its widespread use, there are major elements of this approach that remain uncharacterized, including the TOI dynamics of respiration by marine heterotrophic bacteria and abiotic O2 sinks such as the photochemical oxidation of dissolved organic carbon (DOC). Here, we report the TOI fractionation for O2 utilization by two model marine heterotrophs (Vibrio harveyi and Ruegeria pomeroyi DSS-3) and by abiotic photo-oxidation of representative terrestrial and coastal marine DOC. These data are described further in the related publication, Sutherland et al., 2022 (doi: 10.1093/pnasnexus/pgac233).\n\ncdm_data_type = Other\nVARIABLES:\nSample_ID (unitless)\nd18O_smowslap (permil)\nd17O_smowslap (permil)\nd18O_smowslap_log (unitless)\nd17O_smowslap_log (unitless)\nD17O (permil)\nO2_Ar (unitless)\nlnO2_Ar (unitless)\n | https://erddap.bco-dmo.org/erddap/info/bcodmo_dataset_923821_v1/index.htmlTable | https://osprey.bco-dmo.org/dataset/923821
| https://erddap.bco-dmo.org/erddap/rss/bcodmo_dataset_923821_v1.rss | https://erddap.bco-dmo.org/erddap/subscriptions/add.html?datasetID=bcodmo_dataset_923821_v1&showErrors=false&email= | BCO-DMO | bcodmo_dataset_923821_v1 |