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https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_786013.subset https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_786013 https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_786013.graph https://erddap.bco-dmo.org/erddap/files/bcodmo_dataset_786013/ public [14C 32Si Experimental - from RR1813] - 32Si and 14C production data (experimental) from EXPORTS cruise RR1813 on R/V Roger Revelle in the Subarctic North Pacific near Station PAPA from August to September 2018 (Collaborative Research: Diatoms, Food Webs and Carbon Export - Leveraging NASA EXPORTS to Test the Role of Diatom Physiology in the Biological Carbon Pump) This dataset includes 32Si and 14C production data (experimental) from EXPORTS cruise RR1813. The EXPORTS field campaign in the subarctic North Pacific sampled an ecosystem characterized as high nutrient low chlorophyll (HNLC) due to low iron (Fe) levels that are primary controllers constraining phytoplankton utilization of other nutrients. It has been a paradigm in low Fe, HNLC systems that diatoms grow at elevated Si:C and Si:N ratios and should be efficiently exported as particles significantly enriched in Si relative to C. However, Fe limitation also alters diatoms species composition and the high Si demand imposed by low Fe can drive HNLC regions to Si limitation or Si/Fe co-limitation. Thus, the degree of Si and/or Fe stress in HNLC waters can all alter diatom taxonomic composition, the elemental composition of diatom cells, and the path cells follow through the food web ultimately altering diatom carbon export.\\r\\n\\r\\nWithin each ecosystem state examined in the EXPORTS program, nutrient biogeochemistry, diatom and phytoplankton community structure, and global diatom gene expression patterns (metatranscriptomics) are characterized in the lit ocean. Nutrient amendment experiments with tracer addition (14C, 32Si) are used to quantify the level of Si and Fe stress being experienced by the phytoplankton and to contextualize taxa-specific metatranscriptome responses for resolving gene expression profiles in the in situ communities.\n\ncdm_data_type = Other\nVARIABLES:\nCruise (unitless)\nDate_Zulu (unitless)\nTime_Zulu (unitless)\nEvent_num (unitless)\nActivity (unitless)\nStation (unitless)\nCast (unitless)\nlatitude (degrees_north)\nlongitude (degrees_east)\nRosette_Bottle (unitless)\ndepth (Target Depth, m)\npcnt_lo (unitless (percent))\n... (22 more variables)\n https://erddap.bco-dmo.org/erddap/metadata/fgdc/xml/bcodmo_dataset_786013_fgdc.xml https://erddap.bco-dmo.org/erddap/info/bcodmo_dataset_786013/index.htmlTable https://www.bco-dmo.org/dataset/786013 (external link) https://erddap.bco-dmo.org/erddap/rss/bcodmo_dataset_786013.rss https://erddap.bco-dmo.org/erddap/subscriptions/add.html?datasetID=bcodmo_dataset_786013&showErrors=false&email= BCO-DMO bcodmo_dataset_786013
https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_785856.subset https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_785856 https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_785856.graph https://erddap.bco-dmo.org/erddap/files/bcodmo_dataset_785856/ public [32Si Profiles - from RR1813] - 32Si data from EXPORTS cruise RR1813 on R/V Roger Revelle in the Subarctic North Pacific near Station PAPA from August to September 2018 (Collaborative Research: Diatoms, Food Webs and Carbon Export - Leveraging NASA EXPORTS to Test the Role of Diatom Physiology in the Biological Carbon Pump) This dataset includes depth profiles in the euphotic zone of nutrient (nitrate, silicate, phosphate) concentrations and profiles of silicic acid uptake rates from EXPORTS cruise RR1813. \\r\\n\\r\\nThe EXPORTS field campaign in the subarctic North Pacific sampled an ecosystem characterized as high nutrient low chlorophyll (HNLC) due to low iron (Fe) levels that are primary controllers constraining phytoplankton utilization of other nutrients. It has been a paradigm in low Fe, HNLC systems that diatoms grow at elevated Si:C and Si:N ratios and should be efficiently exported as particles significantly enriched in Si relative to C. However, Fe limitation also alters diatoms species composition and the high Si demand imposed by low Fe can drive HNLC regions to Si limitation or Si/Fe co-limitation. Thus, the degree of Si and/or Fe stress in HNLC waters can all alter diatom taxonomic composition, the elemental composition of diatom cells, and the path cells follow through the food web ultimately altering diatom carbon export.\\r\\n\\r\\nWithin each ecosystem state examined in the EXPORTS program, nutrient biogeochemistry, diatom and phytoplankton community structure, and global diatom gene expression patterns (metatranscriptomics) are characterized in the lit ocean. Nutrient amendment experiments with tracer addition (14C, 32Si) are used to quantify the level of Si and Fe stress being experienced by the phytoplankton and to contextualize taxa-specific metatranscriptome responses for resolving gene expression profiles in the in situ communities.\n\ncdm_data_type = Other\nVARIABLES:\nCruise (unitless)\nDate_Zulu (unitless)\nTime_Zulu (unitless)\nEvent_num (unitless)\nActivity (unitless)\nStation (unitless)\nCast (unitless)\nlatitude (degrees_north)\nlongitude (degrees_east)\nRosette_Bottle (unitless)\ndepth (Target Depth, m)\n... (16 more variables)\n https://erddap.bco-dmo.org/erddap/metadata/fgdc/xml/bcodmo_dataset_785856_fgdc.xml https://erddap.bco-dmo.org/erddap/info/bcodmo_dataset_785856/index.htmlTable https://www.bco-dmo.org/dataset/785856 (external link) https://erddap.bco-dmo.org/erddap/rss/bcodmo_dataset_785856.rss https://erddap.bco-dmo.org/erddap/subscriptions/add.html?datasetID=bcodmo_dataset_785856&showErrors=false&email= BCO-DMO bcodmo_dataset_785856
https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_948718_v1 https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_948718_v1.graph https://erddap.bco-dmo.org/erddap/files/bcodmo_dataset_948718_v1/ public [EPR 2019 Nutrients] - Dissolved nitrate plus nitrite, nitrite and phosphate from water column of the East Pacific Rise in April 2019 aboard the R/V Atlantis cruise AT42-09 (Collaborative Research: From hot to cold in the dark - shifts in seafloor massive sulfide microbial communities as physical and geochemical conditions change after venting ceases) These are dissolved inorganic nutrient concentrations from the eastern tropical north pacific ocean from the water column overlying the east pacific rise at 9°50'N 104°18.14'W  including samples in hypoxic water. The measured nutrients are nitrate plus nitrite, nitrite, and phosphate. Samples were collected through two casts, one each on April 9 2019 and April 13 2019 by Dr. Benjamin Tully aboard the RV Atlantis cruise AT 42-09. Samples were run by Chesapeake Bay Laboratory's Analytical services facility following EPA method 353.2 with analysis overseen by Jerry Frank. While the cruise primarily focused on the hydrothermal vent field below, our team focused on measurements of suspended particles in the water column and their microbial communities. These nutrient data supported this analysis. These data support a paper in review titled \"Quantitative microbial taxonomy across particle size, depth, and oxygen concentration\" lead by Paulina Huanca.\n\ncdm_data_type = Other\nVARIABLES:\nSample_ID (unitless)\ndepth (m)\nlatitude (degrees_north)\nlongitude (degrees_east)\nSample_Date (unitless)\nSample_Time (unitless)\ntime (Sample_iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)\nReceived_Date (unitless)\nNO2 (milligrams per liter (mg N/L))\nNO23 (milligrams per liter (mg N/L))\nPO4 (milligrams per liter (mg P/L))\nNO2_Flag (unitless)\nNO23_Flag (unitless)\nPO4_Flag (unitless)\n https://erddap.bco-dmo.org/erddap/metadata/fgdc/xml/bcodmo_dataset_948718_v1_fgdc.xml https://erddap.bco-dmo.org/erddap/metadata/iso19115/xml/bcodmo_dataset_948718_v1_iso19115.xml https://erddap.bco-dmo.org/erddap/info/bcodmo_dataset_948718_v1/index.htmlTable https://www.bco-dmo.org/dataset/948718 (external link) https://erddap.bco-dmo.org/erddap/rss/bcodmo_dataset_948718_v1.rss https://erddap.bco-dmo.org/erddap/subscriptions/add.html?datasetID=bcodmo_dataset_948718_v1&showErrors=false&email= BCO-DMO bcodmo_dataset_948718_v1
log in [EXPORTS NA nuts and TM field data] - Dissolved trace metal and macronutrient concentrations rom field samples collected during the EXPORTS North Atlantic campaign at the Porcupine Abyssal Plain-Sustained Observatory (PAP-SO) site on board the RRS Discovery (DY131) in May 2021 (Collaborative Research: Diatoms, Food Webs and Carbon Export - Leveraging NASA EXPORTS to Test the Role of Diatom Physiology in the Biological Carbon Pump) This dataset includes dissolved trace metal (manganese, iron, cobalt, nickel, copper, cadmium, zinc, lead) and macronutrient (nitrate+nitrite, phosphate, silicic acid, nitrite) concentration data from field samples collected during the EXPORTS North Atlantic campaign at the Porcupine Abyssal Plain-Sustained Observatory (PAP-SO) site on board the RRS Discovery (DY131). These data were primarily collected opportunistically during the course of water collection for incubation experiments (see separate dataset for incubations), and provide field context for the shipboard incubation experiments as well as temporal characterization of a retentive anticyclonic eddy occupied over the course of the cruise.\n\nThis research focuses on the vertical export of the carbon associated with a major group of phytoplankton, the diatoms in the North Atlantic near the Porcupine Abyssal Plain. The major objective is to understand how diatom community composition and the prevailing nutrient conditions create taxonomic differences in metabolic state that combine to direct diatom taxa to different carbon export pathways. The focus is on diatoms, given their large contribution to global marine primary productivity and carbon export which translates into a significant contribution to the biogeochemical cycling of carbon (C), nitrogen (N), phosphorus (P), iron (Fe) and silicon (Si). It is hypothesized that the type and degree of diatom physiological stress are vital aspects of ecosystem state that drive export. To test this hypothesis, combined investigator expertise in phytoplankton physiology, genomics, and trace element chemistry is used to assess the rates of nutrient use and the genetic composition and response of diatom communities, with measurements of silicon and iron stress to evaluate stress as a predictor of the path of diatom carbon export. The EXPORTS field campaign in the North Atlantic sampled a retentive eddy over nearly a month in May 2021, which coincided with the decline of the North Atlantic Spring Bloom.\n\ncdm_data_type = Other\nVARIABLES:\nCRUISE_ID (unitless)\nEVTNBR (unitless)\nDATE_UTC (unitless)\nTIME_UTC (unitless)\ntime (Iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)\n... (90 more variables)\n BCO-DMO bcodmo_dataset_954941_v1
https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_950296_v1 https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_950296_v1.graph https://erddap.bco-dmo.org/erddap/files/bcodmo_dataset_950296_v1/ public [FeOA Profile Data] - Depth profile chlorophyll, macronutrient, trace metal, metal speciation, and carbon system data from FeOA project cruise SKQ202209S on the R/V Sikuliaq in the Northeast Pacific between June and July 2022 (Collaborative Research: The Effect of Ocean Acidification on Fe Availability to Phytoplankton in Coastal and Oceanic Waters of the Eastern North Pacific) This dataset includes the concentrations of dissolved inorganic macronutrients (phosphate, nitrate plus nitrite (N+N), silicic acid, and nitrite), chlorophyll a and phaeophytin, dissolved trace metals (iron, manganese, nickel, zinc, copper), and labile dissolved nickel, as well as pH and total alkalinity measurements, from discrete depth profile samples collected on the FeOA cruise SKQ202209S on R/V Sikuliaq in the Northeast Pacific from June to July 2022.\n\nThis project investigates the effects of ocean acidification on the associations between iron and organic ligands in seawater and on iron bioavailability to marine phytoplankton communities. The project used a combination of shipboard incubation experiments and depth profiles to characterize iron speciation and cycling across coastal upwelling, oligotrophic open ocean, and iron-limited subarctic oceanographic regimes in the NE Pacific. Surface seawater was incubated at pH of 8.1, 7.6, and 7.1 with natural iron and with dissolved iron amendments in order to investigate interactions between pH and iron bioavailability across the different regimes. Understanding how pH influences iron and its relationship with ligands provides important information for assessing the impacts of ocean acidification on primary production and biogeochemical processes.\n\ncdm_data_type = Other\nVARIABLES:\nCRUISE_ID (unitless)\nEVTNBR (unitless)\nDATE_SHIP (unitless)\nTIME_IN_SHIP (unitless)\nTIME_OUT_SHIP (unitless)\ntime (In_iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)\nOUT_ISO_DateTime_UTC (seconds since 1970-01-01T00:00:00Z)\nlatitude (degrees_north)\nlongitude (degrees_east)\nPLATFORM (unitless)\nCASTNBR (unitless)\nSTNNBR (unitless)\nBTLNBR (unitless)\n... (50 more variables)\n https://erddap.bco-dmo.org/erddap/metadata/fgdc/xml/bcodmo_dataset_950296_v1_fgdc.xml https://erddap.bco-dmo.org/erddap/metadata/iso19115/xml/bcodmo_dataset_950296_v1_iso19115.xml https://erddap.bco-dmo.org/erddap/info/bcodmo_dataset_950296_v1/index.htmlTable https://www.bco-dmo.org/dataset/950296 (external link) https://erddap.bco-dmo.org/erddap/rss/bcodmo_dataset_950296_v1.rss https://erddap.bco-dmo.org/erddap/subscriptions/add.html?datasetID=bcodmo_dataset_950296_v1&showErrors=false&email= BCO-DMO bcodmo_dataset_950296_v1
https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_3470.subset https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_3470 https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_3470.graph https://erddap.bco-dmo.org/erddap/files/bcodmo_dataset_3470/ public [GT10 - Nanomolar Nutrients - Surface] - PO4, NO3, NO2 surface concentrations along the US GEOTRACES North Atlantic Transect from the R/V Knorr KN199-04, KN199-05 cruises in the subtropical N. Atlantic during 2010 (U.S. GEOTRACES NAT project) (U.S. GEOTRACES North Atlantic Transect) PO4, NO3, NO2 surface concentrations along the US GEOTRACES North Atlantic Transect from the R/V Knorr KN199-04, KN199-05 cruises in the subtropical N. Atlantic during 2010.\n\ncdm_data_type = Other\nVARIABLES:\ncruise_id (text)\nGeoFish_id (Geo Fish Id, integer)\nevent_GEOTRC (dimensionless)\nGeoTraces_ID (Geo Traces ID, integer)\nsample_GEOTRC (dimensionless)\ndate (unitless)\ntime2 (Time, HHMM)\nlatitude (degrees_north)\nlongitude (degrees_east)\nPO4 (Mass Concentration Of Phosphate In Sea Water, nmol/L)\nPO4_Flag (integer)\nNO3 (Mole Concentration Of Nitrate In Sea Water, nmol/L)\nNO3_Flag (integer)\nNO2 (Mole Concentration Of Nitrite In Sea Water, nmol/L)\nNO2_Flag (integer)\nRemarks (text)\ntime (ISO Date Time UTC, seconds since 1970-01-01T00:00:00Z)\n https://erddap.bco-dmo.org/erddap/metadata/fgdc/xml/bcodmo_dataset_3470_fgdc.xml https://erddap.bco-dmo.org/erddap/info/bcodmo_dataset_3470/index.htmlTable https://www.bco-dmo.org/dataset/3470 (external link) https://erddap.bco-dmo.org/erddap/rss/bcodmo_dataset_3470.rss https://erddap.bco-dmo.org/erddap/subscriptions/add.html?datasetID=bcodmo_dataset_3470&showErrors=false&email= BCO-DMO bcodmo_dataset_3470
https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_3233.subset https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_3233 https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_3233.graph https://erddap.bco-dmo.org/erddap/files/bcodmo_dataset_3233/ public [nutrients and metals] - Nutrients, cobalt, dissolved iron, and dissolved manganese from trace metal bottles from R/V Knorr cruise KN192-05 in the South Atlantic subtropical gyre and Benguela upwelling region in 2007 (CoFeMUG project) (Cobalt, Iron and Micro-organisms from the Upwelling zone to the Gyre) Analysis of nutrients, Cobalt (total and labile), dissolved Iron, and dissolved Manganese of water samples drawn from Trace Metal Rosette (TMR) bottle casts.\n\ncdm_data_type = Other\nVARIABLES:\ncruise_id (dimensionless)\nsta (dimensionless)\nlatitude (degrees_north)\nlongitude (degrees_east)\nlon_360 (Longitude, decimal degrees)\ndepth_w (Depth, meters)\ndepth (m)\nev_code (dimensionless)\nrun_id (dimensionless)\ncast (dimensionless)\ndate (unitless)\nyear (unitless)\nmon (MM)\nday (DD)\ntime2 (Time, hhmm)\nNO3_NO2 (Mole Concentration Of Nitrate In Sea Water, micromolar)\nNO3_NO2_flag (dimensionless)\nPO4 (Mass Concentration Of Phosphate In Sea Water, micromolar)\nPO4_flag (dimensionless)\nSiO4 (Si O4, micromolar)\nSiO4_flag (Si O4 Flag, dimensionless)\nNO2 (Mole Concentration Of Nitrite In Sea Water, micromolar)\nNO2_flag (dimensionless)\nNH4 (Mole Concentration Of Ammonium In Sea Water, micromolar)\nNH4_flag (dimensionless)\nCo_tot (picomolar)\n... (8 more variables)\n https://erddap.bco-dmo.org/erddap/metadata/fgdc/xml/bcodmo_dataset_3233_fgdc.xml https://erddap.bco-dmo.org/erddap/info/bcodmo_dataset_3233/index.htmlTable https://www.bco-dmo.org/dataset/3233 (external link) https://erddap.bco-dmo.org/erddap/rss/bcodmo_dataset_3233.rss https://erddap.bco-dmo.org/erddap/subscriptions/add.html?datasetID=bcodmo_dataset_3233&showErrors=false&email= BCO-DMO bcodmo_dataset_3233
https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_945375_v1 https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_945375_v1.graph https://erddap.bco-dmo.org/erddap/files/bcodmo_dataset_945375_v1/ public [Shipboard incubations SKQ202209S] - Concentrations of dissolved inorganic macronutrients, chlorophyll a, phaeophytin, PON, and POC measured during phytoplankton shipboard incubation experiments on the FeOA cruise SKQ202209S on R/V Sikuliaq in the NE Pacific from June to July 2022 (Collaborative Research: The Effect of Ocean Acidification on Fe Availability to Phytoplankton in Coastal and Oceanic Waters of the Eastern North Pacific) This dataset includes the concentrations of dissolved inorganic macronutrients (phosphate, nitrate plus nitrite (N+N), silicic acid, and nitrite), chlorophyll a and phaeophytin, and particulate organic nitrogen and carbon measured shipboard in samples collected from phytoplankton shipboard incubation experiments conducted on the FeOA cruise SKQ202209S on R/V Sikuliaq in the Northeast Pacific from June to July 2022.\n\nThis project investigates the effects of ocean acidification on the associations between iron and organic ligands in seawater and on iron bioavailability to marine phytoplankton communities. The project used a combination of shipboard incubation experiments and depth profiles to characterize iron speciation and cycling across coastal upwelling, oligotrophic open ocean, and iron-limited subarctic oceanographic regimes in the NE Pacific. Surface seawater was incubated at pH of 8.1, 7.6, and 7.1 with natural iron and with dissolved iron amendments in order to investigate interactions between pH and iron bioavailability across the different regimes. Understanding how pH influences iron and its relationship with ligands provides important information for assessing the impacts of ocean acidification on primary production and biogeochemical processes.\n\ncdm_data_type = Other\nVARIABLES:\nFeOA_NBR (unitless)\nISO_DateTime_Start_Local (unitless)\ntime (Iso_datetime_start_utc, seconds since 1970-01-01T00:00:00Z)\nISO_DateTime_Stop_Local (unitless)\nISO_DateTime_Stop_UTC (seconds since 1970-01-01T00:00:00Z)\nlatitude (Collection_latitude, degrees_north)\nlongitude (Collection_longitude, degrees_east)\nPLATFORM (unitless)\nSTNNBR (unitless)\nINCNBR (unitless)\nINCDAY (unitless)\nINCTREATMENT (unitless)\nBTLNBR_INC (unitless)\n... (40 more variables)\n https://erddap.bco-dmo.org/erddap/metadata/fgdc/xml/bcodmo_dataset_945375_v1_fgdc.xml https://erddap.bco-dmo.org/erddap/metadata/iso19115/xml/bcodmo_dataset_945375_v1_iso19115.xml https://erddap.bco-dmo.org/erddap/info/bcodmo_dataset_945375_v1/index.htmlTable https://www.bco-dmo.org/dataset/945375 (external link) https://erddap.bco-dmo.org/erddap/rss/bcodmo_dataset_945375_v1.rss https://erddap.bco-dmo.org/erddap/subscriptions/add.html?datasetID=bcodmo_dataset_945375_v1&showErrors=false&email= BCO-DMO bcodmo_dataset_945375_v1
log in [STING macronutrient concentrations] - Dissolved Macronutrient Concentrations from Depth Profiles and Incubation Experiments from STING I Cruise AE2305 on R/V Atlantic Explorer in the Gulf of Mexico from February to March 2023 (Collaborative Research: Linking iron and nitrogen sources in an oligotrophic coastal margin: Nitrogen fixation and the role of boundary fluxes) Concentrations of inorganic dissolved macronutrients, including phosphate, nitrate plus nitrite (N+N), silicic acid, and nitrite, from phytoplankton shipboard incubation experiments and depth profiles collected on STING I cruise AE2305 on R/V Atlantic Explorer in the Gulf of Mexico from February to March 2023.\n\nThis project investigates how groundwater discharge delivers important nutrients to the coastal ecosystems of the West Florida Shelf. Preliminary studies indicate that groundwater may supply both dissolved organic nitrogen (DON) and iron in this region. In coastal ecosystems like the West Florida Shelf that have very low nitrate and ammonium concentrations, DON is the main form of nitrogen available to organisms. Nitrogen cycling is strongly affected by iron availability because iron is essential for both photosynthesis and for nitrogen fixation. This study will investigate the sources and composition of DON and iron, and their influence on the coastal ecosystem. The team will sample offshore groundwater wells, river and estuarine waters, and conduct two expeditions across the West Florida Shelf in winter and summer.\n\ncdm_data_type = Other\nVARIABLES:\nEVTNBR (unitless)\ntime (Iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)\nDATE_UTC (unitless)\nTIME_UTC (unitless)\nDATE_GMT (unitless)\nTIME_GMT (unitless)\nlatitude (degrees_north)\nlongitude (degrees_east)\nPLATFORM (unitless)\nCASTNBR (unitless)\nSTNNBR (unitless)\nBTLNBR (unitless)\ndepth (m)\nPO4 (micromoles per liter (uM))\n... (20 more variables)\n BCO-DMO bcodmo_dataset_929305_v1
log in [STING macronutrient concentrations] - Dissolved Macronutrient Concentrations from Depth Profiles and Incubation Experiments from STING I Cruise AE2305 on R/V Atlantic Explorer in the Gulf of Mexico from February to March 2023 (Collaborative Research: Linking iron and nitrogen sources in an oligotrophic coastal margin: Nitrogen fixation and the role of boundary fluxes) Concentrations of inorganic dissolved macronutrients, including phosphate, nitrate plus nitrite (N+N), silicic acid, and nitrite, from phytoplankton shipboard incubation experiments and depth profiles collected on STING I cruise AE2305 on R/V Atlantic Explorer in the Gulf of Mexico from February to March 2023.\n\nThis project investigates how groundwater discharge delivers important nutrients to the coastal ecosystems of the West Florida Shelf. Preliminary studies indicate that groundwater may supply both dissolved organic nitrogen (DON) and iron in this region. In coastal ecosystems like the West Florida Shelf that have very low nitrate and ammonium concentrations, DON is the main form of nitrogen available to organisms. Nitrogen cycling is strongly affected by iron availability because iron is essential for both photosynthesis and for nitrogen fixation. This study will investigate the sources and composition of DON and iron, and their influence on the coastal ecosystem. The team will sample offshore groundwater wells, river and estuarine waters, and conduct two expeditions across the West Florida Shelf in winter and summer.\n\ncdm_data_type = Other\nVARIABLES:\nEVTNBR (unitless)\ntime (Iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)\nDATE_UTC (unitless)\nTIME_UTC (unitless)\nDATE_GMT (unitless)\nTIME_GMT (unitless)\nlatitude (degrees_north)\nlongitude (degrees_east)\nPLATFORM (unitless)\nCASTNBR (unitless)\nSTNNBR (unitless)\nBTLNBR (unitless)\ndepth (m)\nPO4 (micromoles per liter (uM))\n... (20 more variables)\n BCO-DMO bcodmo_dataset_929305_v2
log in [TMs and Nuts from EXPORTS NA Incubations] - Dissolved trace metal and macronutrient concentration data from incubation experiments conducted during the May 2021 EXPORTS North Atlantic cruise (DY131) (Collaborative Research: Diatoms, Food Webs and Carbon Export - Leveraging NASA EXPORTS to Test the Role of Diatom Physiology in the Biological Carbon Pump) This dataset includes trace metal (iron, manganese, cobalt, nickel, copper, zinc, cadmium, lead) and macronutrient (nitrate+nitrite, nitrite, phosphate, silicic acid) concentration data from incubation experiments conducted on board the RRS Discovery during the EXPORTS North Atlantic campaign at the Porcupine Abyssal Plain-Sustained Observatory (PAP-SO) site (DY131). In these experiments, additions of macronutrients (N, P, Si) and Fe were used to assess the level of Si, N, and Fe stress being experienced by the phytoplankton and to contextualize taxa-specific metatranscriptome responses for resolving gene expression profiles in the in-situ communities.\n\nThis research project focuses on the vertical export of the carbon associated with a major group of phytoplankton, the diatoms in the North Atlantic near the Porcupine Abyssal Plain. The major objective is to understand how diatom community composition and the prevailing nutrient conditions create taxonomic differences in metabolic state that combine to direct diatom taxa to different carbon export pathways. The focus is on diatoms, given their large contribution to global marine primary productivity and carbon export which translates into a significant contribution to the biogeochemical cycling of carbon (C), nitrogen (N), phosphorus (P), iron (Fe) and silicon (Si). It is hypothesized that the type and degree of diatom physiological stress are vital aspects of ecosystem state that drive export. To test this hypothesis, combined investigator expertise in phytoplankton physiology, genomics, and trace element chemistry is used to assess the rates of nutrient use and the genetic composition and response of diatom communities, with measurements of silicon and iron stress to evaluate stress as a predictor of the path of diatom carbon export. The EXPORTS field campaign in the North Atlantic sampled a retentive eddy over nearly a month in May 2021, which coincided with the decline of the North Atlantic Spring Bloom.\n\ncdm_data_type = Other\nVARIABLES:\nCRUISE_ID (unitless)\nEVTNBR (unitless)\nDATE_UTC (unitless)\nJULIAN_DAY (unitless)\nEPOCH (unitless)\nEPOCH_DAY (unitless)\n... (61 more variables)\n BCO-DMO bcodmo_dataset_947637_v1

 
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