19:I[42426,["/_next/static/immutable/chunks/1xctgzqre-wsy.js","/_next/static/immutable/chunks/06_-wz6pdtp2b.js","/_next/static/immutable/chunks/30e52g49hg40p.js","/_next/static/immutable/chunks/02yq6tul2z-oh.js","/_next/static/immutable/chunks/10bx_ec2vj7n_.js","/_next/static/immutable/chunks/33bfn03fo8xnt.js","/_next/static/immutable/chunks/0tfjf78scu61b.js","/_next/static/immutable/chunks/31xnvej4n1bi9.js"],"default"] 1a:T538,

We conducted 12-h nitrate uptake experiments in on-land incubators. Each incubator was cooled with flow-through seawater. Nitrate uptake rates were typically conducted on 1-L samples collected from 0, 5, 10, 20, and 65 m. Samples were placed in polycarbonate bottles and spiked with 15-N labeled nitrate, then placed in mesh shading to approximate 100% surface irradiance (0 m), 50% surface irradiance (5 m), 25% surface irradiance (10 m), 10% surface irradiance (20 m), and dark (65 m). These light levels were chosen to match Palmer LTER net primary production depths and light levels and are close to the seasonal average light levels at these depths, although actual light varied substantially throughout the season (see Stukel et al. 2015). At the end of the 24-hour incubation, bottles were immediately vacuum filtered onto pre-combusted 25-mm GF/F filters. Filters were rinsed with filtered seawater, wrapped in foil and stored at 80°C. On land, samples were fumigated with HCl vapor to remove inorganic carbon, dried, and placed inside a tin cup for C/N and isotopic analysis at the UC Davis stable isotope facility. NO3- uptake rates in each incubation bottle (and associated uncertainties) were determined using equations in Dugdale and Wilkerson (1986). For additional details see Stukel et al. (2015).

1b:Tec0,NSF Award Abstract: Algae in the surface ocean convert carbon dioxide into organic carbon through photosynthesis. The biological carbon pump transports this organic carbon from the atmosphere to the deep ocean where it can be stored for tens to hundreds of years. Annually, the amount transported is similar to that humans are currently emitting by burning fossil fuels. However, at present we cannot predict how this important process will change with a warming ocean. These investigators plan to develop a 15+ year time-series of vertical carbon transfer for the Western Antarctic Peninsula; a highly productive Antarctic ecosystem. This region is also rapid transition to warmer temperatures leading to reduced sea ice coverage. This work will help researchers better understand how the carbon cycle in the Western Antarctic Peninsula will respond to climate change. The researchers will develop the first large-scale time-series of carbon flux anywhere in the ocean. This research will also support the education and training of a graduate student and support the integration of concepts in Antarctic research into two undergraduate courses designed for non-science majors and advanced earth science students. The researchers will also develop educational modules for introducing elementary and middle-school age students to important concepts such as gross and net primary productivity, feedbacks in the marine and atmospheric systems, and the differences between correlation and causation. Results from this proposal will also be incorporated into a children’s book, “Plankton do the Strangest Things”, that is targeted at 5-7 year olds and is designed to introduce them to the incredible diversity and fascinating adaptations of microscopic marine organisms. This research seeks to leverage 6 years (2015-2020) of 234Th samples collected on Palmer LTER program, 5 years of prior measurements (2009-2010, 2012-2014), and upcoming cruises (2021-2023) to develop a time-series of summertime particle flux in the WAP that stretches for 15 years. The 238U-234Th disequilibrium approach utilizes changes in the activity of the particle-active radio-isotope 234Th relative to its parent nuclide 238U to quantify the flux of sinking carbon out of the surface ocean (over a time-scale of ~one month). This proposal will fund 234Th analyses from nine years’ worth of cruises (2015-2023) and extensive analyses designed to investigate the processes driving inter-annual variability in the BCP. These include: 1) physical modeling to quantify the importance of advection and diffusion in the 234Th budget, 2) time-series analyses of particle flux, and 3) statistical modeling of the relationships between particle flux and multiple presumed drivers (biological, chemical, physical, and climate indices) measured by collaborators in the Palmer LTER program. This multi-faceted approach is critical for linking the measurements to models and for predicting responses to climate change. It will also test the hypothesis that export flux is decreasing in the northern WAP, increasing in the southern WAP, and increasing when integrated over the entire region as a result of earlier sea ice retreat and a larger ice-free zone. The project will also investigate relationships between carbon export and multiple potentially controlling factors including: primary productivity, algal biomass and taxonomic composition, biological oxygen saturation, zooplankton biomass and taxonomic composition, bacterial production, temperature, wintertime sea ice extent, date of sea ice retreat, and climate modes. This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.6:["$","$L19",null,{"dataset":{"_id":"881069","description":"","problem":"","acquisition":"$1a","processing":"","bcodmoProcessing":"- Spaces removed from column names and replaced with underscores (\"_\")\r\n- Row containing units removed from the data file\r\n- Standardized format of dates in the data file\r\n- Converted dates in the data file from %m-%d-%y format to %Y-%m-%d format\r\n- Added a column ISO_DateTime_UTC containing date times represented in UTC\r\n- Removed AM and PM from time field in data file\r\n- Added concatenated datetime field to data file","title":"Phytoplankton nitrate uptake rates collected during the 2012-2013 Palmer Field Season (WAP Carbon export project)","nickname":"Palmer Station Nitrate Uptake","dataUrl":"","currentState":"Final no updates expected","currentStateId":"7","validated":true,"restricted":false,"version":"1","version_date":"2022-08-02T04:00:00.000Z","abstract":"Uptake of nitrate by phytoplankton during the 2012-2013 field season of the Palmer LTER program near Anvers Island in the Western Antarctic Peninsula. Nitrate uptake is a proxy for production based on “new” nitrogen entering the ecosystem and hence should balance export flux when integrated over sufficiently large spatial scales and long temporal scales. Nitrate uptake was measured through the uptake of isotopically labeled nitrate, typically at 5 depts spanning the surface to 65 m depth. Measurements were typically made twice per week through the ice-free summer phytoplankton growing season. ","citation":"Stukel, M. (2024) Phytoplankton nitrate uptake rates collected during the 2012-2013 Palmer Field Season (WAP Carbon export project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2022-08-02 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.881069.1 [access date]","citationParts":{"identifier":"doi:10.26008/1912/bco-dmo.881069.1","versionDate":"2022-08-02","versionId":"1","year":"2024","title":"Phytoplankton nitrate uptake rates collected during the 2012-2013 Palmer Field Season (WAP Carbon export project)","authors":"Stukel, M.","publisher":"Biological and Chemical Oceanography Data Management Office (BCO-DMO)."},"doi":"10.26008/1912/bco-dmo.881069.1","release_date":null,"field_dataset_location":"Western Antarctic Peninsula near Anvers Island","temporal_extent":{"start":"2012-10-31T04:00:00.000Z","end":"2013-03-21T04:00:00.000Z"},"temporal":{"resolution":"time:unitDay","type":"time:Interval","start":{"value":"1351656000","label":"2012-10-31"},"end":{"value":"1363838400","label":"2013-03-21"}},"spatial_extent":{"shape":"polygon","center":{"latitude":-64.79725000266,"longitude":-64.05650000263},"wkt":"POLYGON ((-64.0725 -64.815, -64.0405 -64.815, -64.0405 -64.7795, -64.0725 -64.7795, -64.0725 -64.815))","north":-64.7795,"east":-64.0405,"south":-64.815,"west":-64.0725},"dataset_type":["Other Field Results"],"keywords":["oceans"],"data_files":[{"id":"938199","title":"881069_v1_palmer_station_nitrate_uptake.csv","url":"https://datadocs.bco-dmo.org/dataset/881069/file/3YpL9g2U7zvjnr/881069_v1_palmer_station_nitrate_uptake.csv","showTableUrl":"https://www.bco-dmo.org/dataset/881069/data/view/938199","description":"Primary data file for dataset ID 881069, version 1","filename":"881069_v1_palmer_station_nitrate_uptake.csv","bytesize":18325,"checksum":{"value":"156075fdff14739eba803d4eef40776f","Algorithm":{"_id":"190","name":"MD5"}},"mimetype":"text/csv","fileType":{"_id":"192","name":"Comma Separated Values (.csv)"},"isErddap":"bcodmo_dataset_881069_v1","date":"","isPublicDuringEmbargo":false,"primaryDataFile":true,"showTable":true,"restricted":false}],"supplemental_files":[],"roles":[{"role":{"_id":"138","name":"Principal Investigator"},"performedBy":{"_id":"515983","name":"Michael R. Stukel"},"performedAtOrganization":{"_id":"35","name":"Florida State University EOAS"}},{"role":{"_id":"133","name":"Contact"},"performedBy":{"_id":"515983","name":"Michael R. Stukel"},"performedAtOrganization":{"_id":"35","name":"Florida State University EOAS"}},{"role":{"_id":"145","name":"BCO-DMO Data Manager"},"performedBy":{"_id":"852000","name":"Sawyer Newman"},"performedAtOrganization":{"_id":"191","name":"Woods Hole Oceanographic Institution"}}],"deployments":[],"funding":[{"_id":"754881","name":"OCE-1756610","fundingSource":{"_id":"355","name":"NSF Division of Ocean Sciences"},"url":"https://www.nsf.gov/awardsearch/show-award?AWD_ID=1756610"},{"_id":"838047","name":"OPP-1951090","fundingSource":{"_id":"713360","name":"NSF Office of Polar Programs (formerly NSF PLR)"},"url":"https://www.nsf.gov/awardsearch/show-award?AWD_ID=1951090"},{"_id":"881090","name":"OPP-1340886","fundingSource":{"_id":"713360","name":"NSF Office of Polar Programs (formerly NSF PLR)"},"url":"https://www.nsf.gov/awardsearch/show-award?AWD_ID=1340886"},{"_id":"881092","name":"OPP-1440435","fundingSource":{"_id":"713360","name":"NSF Office of Polar Programs (formerly NSF PLR)"},"url":"https://www.nsf.gov/awardsearch/show-award?AWD_ID=1440435"}],"instruments":[],"parameters":[{"_id":"936436","name":"Station","format":"","frictionlessType":"string","description":"

Palmer LTER station name from which sample was collected.

","units":{"_id":"","name":"unitless"},"type":{"_id":"987","name":"station","description":"

Station identifier; a unique number or alphanumeric string designating a general geographic location at which one or more sampling activities may occur.

"}},{"_id":"936437","name":"Latitude","format":"","frictionlessType":"number","description":"

Station Latitude in decimal degrees; a positive value indicates a Northern coordinate.

","units":{"_id":"","name":"decimal degrees"},"type":{"_id":"730","name":"latitude","description":"

latitude, in decimal degrees, North is positive, negative denotes South; Reported in some datasets as degrees, minutes

"}},{"_id":"936438","name":"Longitude","format":"","frictionlessType":"number","description":"

Station Longitude in decimal degrees; a positive value indicates an Eastern coordinate.

","units":{"_id":"","name":"decimal degrees"},"type":{"_id":"731","name":"longitude","description":"

longitude, in decimal degrees, East is positive, negative denotes West; Reported in some datasets as degrees, minutes

"}},{"_id":"936439","name":"Date","format":"%Y-%m-%d","frictionlessType":"date","description":"

Date and time of sample collection in local time at Palmer Station (UTC-3).

","units":{"_id":"","name":"unitless"},"type":{"_id":"719088","name":"DateTime","description":"

Date and time; variously formatted.

"}},{"_id":"936440","name":"Incubation_Start_Time","format":"%H:%M:%S","frictionlessType":"time","description":"

Time of incubation start in local time at Palmer Station (UTC-3).

","units":{"_id":"","name":"unitless"},"type":{"_id":"1117","name":"time_begin","description":"

time at start of measurement (GMT)

"}},{"_id":"936441","name":"ISO_DateTime_UTC","format":"%Y-%m-%dT%H:%M:%SZ","frictionlessType":"datetime","description":"

Date and time of incubation start in UTC.

","units":{"_id":"","name":"unitless"},"type":{"_id":"1117","name":"time_begin","description":"

time at start of measurement (GMT)

"}},{"_id":"936442","name":"Depth","format":"","frictionlessType":"integer","description":"

Depth at which sample was collected.

","units":{"_id":"","name":"meters (m)"},"type":{"_id":"808","name":"depth","description":"

Observation/sample depth below the sea surface. Units often reported as: meters, feet.

\nWhen used in a JGOFS/GLOBEC dataset the depth is a best estimate; usually but not always calculated from pressure; calculated either from CTD pressure using Fofonoff and Millard (1982; UNESCO Tech Paper #44) algorithm adjusted for 1980 equation of state for seawater (EOS80) or simply equivalent to nominal depth as recorded during sampling if CTD pressure was unavailable.

"}},{"_id":"936443","name":"Incubation_Light_Level","format":"","frictionlessType":"number","description":"

Fraction of surface irradiance.

","units":{"_id":"","name":"unitless"},"type":{"_id":"1156","name":"irrad_incub","description":"

irradiance level set for incubation experiments

"}},{"_id":"936444","name":"Nitrate","format":"","frictionlessType":"number","description":"

Nitrate + Nitrite concentration.

","units":{"_id":"","name":"micromoles per Liter (umol/L)"},"type":{"_id":"902","name":"NO3_NO2","description":"

Nitrate and Nitrite, µM (micromolar) or µg-at NO3-N and NO2-N/l

"}},{"_id":"936445","name":"NO3_Uptake","format":"","frictionlessType":"number","description":"

Nitrate uptake.

","units":{"_id":"","name":"micromoles per Liter per day (umol/L/day)"},"type":{"_id":"1194","name":"NO3","description":"

Nitrate concentration in the water column

"}}],"related_publications":[{"id":"881112","citation":"Dugdale, R. C., & Wilkerson, F. P. (1986). The use of 15\r\nN to measure nitrogen uptake in eutrophic oceans; experimental considerations1,2. Limnology and Oceanography, 31(4), 673–689. Portico. https://doi.org/10.4319/lo.1986.31.4.0673\r\n","relation_type":["Methods"],"relation_desc":""},{"id":"881095","citation":"Stukel, M. R., Asher, E., Couto, N., Schofield, O., Strebel, S., Tortell, P., & Ducklow, H. W. (2015). The imbalance of new and export production in the western Antarctic Peninsula, a potentially “leaky” ecosystem. Global Biogeochemical Cycles, 29(9), 1400–1420. Portico. https://doi.org/10.1002/2015gb005211\r\n","relation_type":["Methods"],"relation_desc":""}],"related_datasets":[],"services":[{"grouping":"","items":[{"name":"View Data","description":"An in-browser view of the primary tabular data file","url":"https://www.bco-dmo.org/dataset/881069/data/view","contentType":"text/html","actionType":"view"}]},{"grouping":"ERDDAP","items":[{"name":"SUBSET DATA","description":"","url":"https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_881069_v1.html","contentType":"text/html","actionType":"tool"},{"name":"VIEW TABLE","description":"","url":"https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_881069_v1.htmlTable","contentType":"text/html","actionType":"view"},{"name":"CSV","description":"","url":"https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_881069_v1.csv","contentType":"text/csv","actionType":"download"},{"name":"TSV","description":"","url":"https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_881069_v1.tsv","contentType":"text/tsv","actionType":"download"},{"name":"GeoJSON","description":"","url":"https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_881069_v1.geoJson","contentType":"application/geo+json","actionType":"download"},{"name":"MATLAB","description":"","url":"https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_881069_v1.mat","contentType":"text/x-matlab","actionType":"download"},{"name":"netCDF","description":"","url":"https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_881069_v1.nc","contentType":"application/x-netcdf","actionType":"download"}]},{"grouping":"Metadata","items":[{"name":"HTML","description":"A simple HTML page of the dataset metadata","url":"https://www.bco-dmo.org/dataset/881069/description","contentType":"text/html","actionType":"view"},{"name":"PDF","description":"A PDF of the HTML dataset metadata","url":"https://www.bco-dmo.org/dataset/881069/Dataset_description.pdf","contentType":"application/pdf","actionType":"download"},{"name":"ISO 19115-2 (NOAA Profile)","description":"","url":"https://www.bco-dmo.org/dataset/881069/iso","contentType":"application/xml","actionType":"download"}]}],"programs":[],"projects":[{"_id":"838048","name":"Quantifying Processes Driving Interannual Variability in the Biological Carbon Pump in the Western Antarctic Peninsula","acronym":"WAP Carbon export","description":"$1b"}],"archives":[{"id_value":"10.26008/1912/bco-dmo.881069.1","url":"https://doi.org/10.26008/1912/bco-dmo.881069.1","date_assigned":"2024-09-23","version_date":"2022-08-02","archiver":"Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)","archiver_id":"272"}],"license":{"name":"Creative Commons Attribution 4.0","id":"CC-BY-4.0","uri":"https://creativecommons.org/licenses/by/4.0/","spdxUri":"https://spdx.org/licenses/CC-BY-4.0"},"metrics":{"views":{"count":118},"downloads":{"count":252}}}}]