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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_995681_v1 | https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_995681_v1.graph | https://erddap.bco-dmo.org/erddap/files/bcodmo_dataset_995681_v1/ | public | [Mesopelagic decay experiments: Biochemical decay rates] - Biochemical decay rates from mesopelagic decay experiments with Thalassiosira weissflogii, Emiliania huxleyii, and Tetraselmis sp. (Collaborative Research: Transforming Carbon in the Deep Sea) | The mesopelagic zone is a site of strong microbially driven particle attenuation with depth and thus plays a crucial role in controlling the transfer efficiency of the ocean's biological pump. However, little quantitative information exists on the dependency of decay processes on the source material. Here we followed the decay of 14C-labeled dead particulate carbon (POC) and dissolved organic carbon (DOC) from three different phytoplankton species, and two incubations of live diatoms, in mesopelagic water over three months. Commonly used first-order kinetics failed to adequately describe the decay of organic material as rate constants varied from day to day. Over extended periods, decay rates for organic material exhibited two distinct phases, with rates in the second phase being inversely related to rates in the first phase. Microbial biomass (measured via ATP and cell counts) increased substantially during phase 1 and ebbed during phase 2. Decay rates were significantly different among the three algal sources; however, differences were even more pronounced among carbon pools and followed a distinct pattern (combined average per-day decay rates at 12 degrees Celsius): fresh DOC (0.6) > fresh POC (0.1) > live cells (0.06) > aged DOC/POC (0.01). Separation of POC into four broad biochemical fractions showed that components in the operationally defined lipid fraction contained the most degradable compounds for fresh material. Our research highlights the need to include the dynamics of the most easily digestible fractions of freshly released organic material, and live plankton resilient to digestion, in calculations of vertical carbon flux budgets. \n\nThis dataset reports decay rates for particulate organic carbon (POC) and its biochemical fractions including proteins, polysaccharides, lipids, and low molecular weight compounds from mesopelagic decay experiments using three 14C-labeled algae (Thalassiosira weissflogii, Tetraselmis sp., and Emiliania huxleyi). See the \"Related Datasets\" section for complementary datasets from the same experiments.\n\ncdm_data_type = Other\nVARIABLES:\nExperiment (unitless)\nAlgal_substrate (unitless)\nCarbon_pool (unitless)\nInterval (TBD)\n... (13 more variables)\n | https://erddap.bco-dmo.org/erddap/info/bcodmo_dataset_995681_v1/index.htmlTable | https://osprey.bco-dmo.org/dataset/995681
| https://erddap.bco-dmo.org/erddap/rss/bcodmo_dataset_995681_v1.rss | https://erddap.bco-dmo.org/erddap/subscriptions/add.html?datasetID=bcodmo_dataset_995681_v1&showErrors=false&email= | BCO-DMO | bcodmo_dataset_995681_v1 | |||||
| https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_995521_v1 | https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_995521_v1.graph | https://erddap.bco-dmo.org/erddap/files/bcodmo_dataset_995521_v1/ | public | [Mesopelagic decay experiments: Biochemical percentages] - Biochemical percentages (protein, polysaccharides, and lipids) from mesopelagic decay experiments with Thalassiosira weissflogii, Emiliania huxleyii, and Tetraselmis sp. (Collaborative Research: Transforming Carbon in the Deep Sea) | The mesopelagic zone is a site of strong microbially driven particle attenuation with depth and thus plays a crucial role in controlling the transfer efficiency of the ocean's biological pump. However, little quantitative information exists on the dependency of decay processes on the source material. Here, we followed the decay of 14C-labeled dead particulate carbon (POC) and dissolved organic carbon (DOC) from three different phytoplankton species, and two incubations of live diatoms, in mesopelagic water over three months. Commonly used first-order kinetics failed to adequately describe the decay of organic material as rate constants varied from day to day. Over extended periods, decay rates for organic material exhibited two distinct phases, with rates in the second phase being inversely related to rates in the first phase. Microbial biomass (measured via ATP and cell counts) increased substantially during phase 1 and ebbed during phase 2. Decay rates were significantly different among the three algal sources; however, differences were even more pronounced among carbon pools and followed a distinct pattern (combined average per-day decay rates at 12 degrees Celsius): fresh DOC (0.6) > fresh POC (0.1) > live cells (0.06) > aged DOC/POC (0.01). Separation of POC into four broad biochemical fractions showed that components in the operationally defined lipid fraction contained the most degradable compounds for fresh material. Our research highlights the need to include the dynamics of the most easily digestible fractions of freshly released organic material, and live plankton resilient to digestion, in calculations of vertical carbon flux budgets.\n\nThis dataset contains measurements of the percentage of 14C remaining over time in three biochemical fractions (protein, polysaccharides, and lipids) derived from particulate organic carbon (POC) in mesopelagic decay experiments using three different 14C-labeled algae (Thalassiosira weissflogii, Tetraselmis sp., and Emiliania huxleyi). See the \"Related Datasets\" section for complementary datasets from the same experiments.\n\ncdm_data_type = Other\nVARIABLES:\nExperiment (unitless)\nAlgal_substrate (unitless)\nCarbon_pool (unitless)\nElapsed_days (days)\n... (9 more variables)\n | https://erddap.bco-dmo.org/erddap/info/bcodmo_dataset_995521_v1/index.htmlTable | https://osprey.bco-dmo.org/dataset/995521
| https://erddap.bco-dmo.org/erddap/rss/bcodmo_dataset_995521_v1.rss | https://erddap.bco-dmo.org/erddap/subscriptions/add.html?datasetID=bcodmo_dataset_995521_v1&showErrors=false&email= | BCO-DMO | bcodmo_dataset_995521_v1 | |||||
| https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_995456_v1 | https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_995456_v1.graph | https://erddap.bco-dmo.org/erddap/files/bcodmo_dataset_995456_v1/ | public | [Mesopelagic decay experiments: bulk 14C, ATP, and prokaryote and protist abundances] - Bulk percentage of 14C, ATP, prokaryote and protist abundances from mesopelagic decay experiments with Thalassiosira weissflogii, Emiliania huxleyi, and Tetraselmis sp. (Collaborative Research: Transforming Carbon in the Deep Sea) | The mesopelagic zone is a site of strong microbially driven particle attenuation with depth and thus plays a crucial role in controlling the transfer efficiency of the ocean's biological pump. However, little quantitative information exists on the dependency of decay processes on the source material. Here, we followed the decay of 14C-labeled dead particulate carbon (POC) and dissolved organic carbon (DOC) from three different phytoplankton species, and two incubations of live diatoms, in mesopelagic water over three months. Commonly used first-order kinetics failed to adequately describe the decay of organic material as rate constants varied from day to day. Over extended periods, decay rates for organic material exhibited two distinct phases, with rates in the second phase being inversely related to rates in the first phase. Microbial biomass (measured via ATP and cell counts) increased substantially during phase 1 and ebbed during phase 2. Decay rates were significantly different among the three algal sources; however, differences were even more pronounced among carbon pools and followed a distinct pattern (combined average per-day decay rates at 12 degrees Celsius): fresh DOC (0.6) > fresh POC (0.1) > live cells (0.06) > aged DOC/POC (0.01). Separation of POC into four broad biochemical fractions showed that components in the operationally defined lipid fraction contained the most degradable compounds for fresh material. Our research highlights the need to include the dynamics of the most easily digestible fractions of freshly released organic material, and live plankton resilient to digestion, in calculations of vertical carbon flux budgets. \n \nThis dataset includes bulk percent remaining 14C, ATP concentrations, and prokaryote and protist abundances, and instantaneous decay rate calculations from mesopelagic decay experiments using three different 14C-labeled algae (Thalassiosira weissflogii, Tetraselmis sp., and Emiliania huxleyi). See the \"Related Datasets\" section for complementary datasets from the same experiments.\n\ncdm_data_type = Other\nVARIABLES:\nExperiment (unitless)\nAlgal_substrate (unitless)\nCarbon_pool (unitless)\nElapsed_days (days)\nPcnt_14C_flask1 (percent (%))\n... (17 more variables)\n | https://erddap.bco-dmo.org/erddap/info/bcodmo_dataset_995456_v1/index.htmlTable | https://osprey.bco-dmo.org/dataset/995456
| https://erddap.bco-dmo.org/erddap/rss/bcodmo_dataset_995456_v1.rss | https://erddap.bco-dmo.org/erddap/subscriptions/add.html?datasetID=bcodmo_dataset_995456_v1&showErrors=false&email= | BCO-DMO | bcodmo_dataset_995456_v1 |