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| Dataset Title: | Grazing rates of Euphausia crystallorophias from RVIB Nathaniel B. Palmer NBP1801 in the Ross Sea, Jan.-Feb. 2018 
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| Institution: | BCO-DMO (Dataset ID: bcodmo_dataset_792478) |
| Information: | Summary
| License
| ISO 19115
| Metadata
| Background
| Data Access Form
| Files
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![[The graph you specified. Please be patient.]](https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_792478.png?Krill_number,Time_Interval_minutes&.draw=markers&.marker=5%7C5&.color=0x000000&.colorBar=%7C%7C%7C%7C%7C&.bgColor=0xffccccff)
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Attributes {
s {
Measurement {
String bcodmo_name "brief_desc";
String description "The measurement as part of the gut fluorescence/gut evacuation technique that the final chlorophyll and phaeopigment data will be used for in calculations of krill grazing";
String long_name "Measurement";
String units "unitless";
}
Krill_number {
Byte _FillValue 127;
Byte actual_range 1, 55;
String bcodmo_name "replicate";
Float64 colorBarMaximum 100.0;
Float64 colorBarMinimum 0.0;
String description "Sequential number of krill used for each measurement component of the gut fluorescence/gut evacuation technique";
String long_name "Krill Number";
String units "unitless";
}
Time_Interval_minutes {
Int16 _FillValue 32767;
Int16 actual_range 0, 1440;
String bcodmo_name "time_elapsed";
String description "Time interval during each grazing experiment whereby krill were removed from replicate buckets and processed for gut fluorescence";
String long_name "Time Interval Minutes";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/ELTMZZZZ/";
String units "minutes";
}
Bucket_number {
Byte _FillValue 127;
Byte actual_range 1, 5;
String bcodmo_name "tank";
Float64 colorBarMaximum 100.0;
Float64 colorBarMinimum 0.0;
String description "Bucket number that indicates where krill were removed at specific intervals during each grazing experiment. There were five replicate buckets; each with 12 krill during each experiment";
String long_name "Bucket Number";
String units "unitless";
}
E1_Krill_length_mm {
Float32 _FillValue NaN;
Float32 actual_range 9.0, 24.5;
String bcodmo_name "length";
String description "Experiment 1: standard length of individual krill (anterior tip of the rostrum to posterior tip of the uropod) measured with digital calipers from the experiments that were ultimately processed for gut fluorescence";
String long_name "E1 Krill Length Mm";
String units "mm = millimeters";
}
E1_Chlorophyll_a_ug_L {
Float32 _FillValue NaN;
Float32 actual_range 0.0, 39.96;
String bcodmo_name "chlorophyll a";
Float64 colorBarMaximum 30.0;
Float64 colorBarMinimum 0.03;
String colorBarScale "Log";
String description "Experiment 1: chlorophyll a concentration of individual krill measured with a Turner 10-AU fluorometer";
String long_name "Concentration Of Chlorophyll In Sea Water";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/CPHLHPP1/";
String units "ug/L = micrograms per liter";
}
E1_Phaeopigment_ug_L {
Float32 _FillValue NaN;
Float32 actual_range 0.04, 24.21;
String bcodmo_name "phaeopigment";
String description "Experiment 1: phaeopigment concentration of individual krill measured with a Turner 10-AU fluorometer after addition of hydrochloric acid";
String long_name "E1 Phaeopigment Ug L";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/PHAEFMP1/";
String units "ug/L = micrograms per liter";
}
E2_Krill_length_mm {
Float32 _FillValue NaN;
Float32 actual_range 10.4, 38.5;
String bcodmo_name "length";
String description "Experiment 2: standard length of individual krill (anterior tip of the rostrum to posterior tip of the uropod) measured with digital calipers from the experiments that were ultimately processed for gut fluorescence";
String long_name "E2 Krill Length Mm";
String units "mm = millimeters";
}
E2_Chlorophyll_a_ug_L {
Float32 _FillValue NaN;
Float32 actual_range 0.04, 38.65;
String bcodmo_name "chlorophyll a";
Float64 colorBarMaximum 30.0;
Float64 colorBarMinimum 0.03;
String colorBarScale "Log";
String description "Experiment 2: chlorophyll a concentration of individual krill measured with a Turner 10-AU fluorometer";
String long_name "Concentration Of Chlorophyll In Sea Water";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/CPHLHPP1/";
String units "ug/L = micrograms per liter";
}
E2_Phaeopigment_ug_L {
Float32 _FillValue NaN;
Float32 actual_range 0.08, 62.26;
String bcodmo_name "phaeopigment";
String description "Experiment 2: phaeopigment concentration of individual krill measured with a Turner 10-AU fluorometer after addition of hydrochloric acid";
String long_name "E2 Phaeopigment Ug L";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/PHAEFMP1/";
String units "ug/L = micrograms per liter";
}
E3_Krill_length_mm {
Float32 _FillValue NaN;
Float32 actual_range 8.7, 28.8;
String bcodmo_name "length";
String description "Experiment 3: standard length of individual krill (anterior tip of the rostrum to posterior tip of the uropod) measured with digital calipers from the experiments that were ultimately processed for gut fluorescence";
String long_name "E3 Krill Length Mm";
String units "mm = millimeters";
}
E3_Chlorophyll_a_ug_L {
Float32 _FillValue NaN;
Float32 actual_range 0.04, 8.91;
String bcodmo_name "chlorophyll a";
Float64 colorBarMaximum 30.0;
Float64 colorBarMinimum 0.03;
String colorBarScale "Log";
String description "Experiment 3: chlorophyll a concentration of individual krill measured with a Turner 10-AU fluorometer";
String long_name "Concentration Of Chlorophyll In Sea Water";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/CPHLHPP1/";
String units "ug/L = micrograms per liter";
}
E3_Phaeopigment_ug_L {
Float32 _FillValue NaN;
Float32 actual_range 0.14, 8.19;
String bcodmo_name "phaeopigment";
String description "Experiment 3: phaeopigment concentration of individual krill measured with a Turner 10-AU fluorometer after addition of hydrochloric acid";
String long_name "E3 Phaeopigment Ug L";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/PHAEFMP1/";
String units "ug/L = micrograms per liter";
}
E4_Krill_length_mm {
Float32 _FillValue NaN;
Float32 actual_range 14.7, 30.9;
String bcodmo_name "length";
String description "Experiment 4: standard length of individual krill (anterior tip of the rostrum to posterior tip of the uropod) measured with digital calipers from the experiments that were ultimately processed for gut fluorescence";
String long_name "E4 Krill Length Mm";
String units "mm = millimeters";
}
E4_Chlorophyll_a_ug_L {
Float32 _FillValue NaN;
Float32 actual_range 0.23, 5.76;
String bcodmo_name "chlorophyll a";
Float64 colorBarMaximum 30.0;
Float64 colorBarMinimum 0.03;
String colorBarScale "Log";
String description "Experiment 4: chlorophyll a concentration of individual krill measured with a Turner 10-AU fluorometer";
String long_name "Concentration Of Chlorophyll In Sea Water";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/CPHLHPP1/";
String units "ug/L = micrograms per liter";
}
E4_Phaeopigment_ug_L {
Float32 _FillValue NaN;
Float32 actual_range 1.33, 52.3;
String bcodmo_name "phaeopigment";
String description "Experiment 4: phaeopigment concentration of individual krill measured with a Turner 10-AU fluorometer after addition of hydrochloric acid";
String long_name "E4 Phaeopigment Ug L";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/PHAEFMP1/";
String units "ug/L = micrograms per liter";
}
}
NC_GLOBAL {
String access_formats ".htmlTable,.csv,.json,.mat,.nc,.tsv";
String acquisition_description
"Sample collection: Mid-water trawls were conducted in the western Ross Sea,
Antarctica on board the R/V Nathaniel B. Palmer in January-February 2018
(cruise number 18-01). The Issacs-Kidd Midwater Trawl (IKMT, 1.8 m frame, 500
um mesh, non-filtering cod end) was fitted with a calibrated General Oceanics
flow meter. Four trawls were completed, each used to conduct a grazing
experiment using the gut fluorescence/gut evacuation technique. Sampling
stations for experiments 1-3 were located on the Continental Shelf Adjacent to
the Ross Ice Shelf barrier near 76\\u00baS, and experiment 4 was located on the
continental shelf near 74\\u00baS.
Experiment 1 date and location: 1/16/2018; -76 00.044S, 176 59.909E
Experiment 2 date and location: 1/18/2018; -76 45.024S, 172 01.733E
Experiment 3 date and location: 2/6/2018; -76 27.063S, 168 07.142E
Experiment 4 date and location: 2/16/2018; -74 49.955S, 164 34.177E
Experimental Procedure: Immediately after each trawl (for each experiment), a
subset of crystal krill, Euphausia crystallorophias, were processed for
initial gut fluorescence and the other krill were sorted into experimental
buckets for a time series sample collection. The krill collected for initial
gut fluorescence were immediately measured for length, wrapped in foil, flash
frozen in liquid nitrogen, and placed in a -80\\u00baC freezer for later
chlorophyll gut content analysis (see below). To determine gut evacuation
rates, an additional 5 krill were processed immediately after collection for
the initial time point, T0. The remaining krill were quickly sorted into five
buckets to achieve a total of 12 krill per bucket. Each bucket was filled with
15L of 0.2\\u00b5m filtered seawater, and 4.0 mg of activated granular charcoal
powder was added at a final concentration of 265 \\u00b5g L-1. The filtered
seawater was maintained at in situ temperature in a cold incubator room for
the duration of the 24-hr experiment. One krill per bucket was removed at time
points of 5, 10, 15, 20, 25, 30, 40, 50, 60, and 120 minutes, yielding a
sample size of five krill per time point. Finally, 1-2 krill were removed
after 24 hours to obtain background gut fluorescence which is to be subtracted
from all the other krill fluorescence samples. All krill removed at each time
point were measured for standard length, wrapped in foil, flash frozen in
liquid nitrogen, and placed in the -80\\u00baC freezer.
\\u00a0Analyses: Fluorometric analysis was then conducted on the krill samples
using a Turner 10-AU Fluorometer before and after acidification. The analysis
was performed in the dark to ensure that chlorophyll did not degrade during
sample preparation and processing. Each krill was placed without
homogenization into a 20mL glass scintillation vial where 5ml of 90% acetone
was added to extract chlorophyll pigments. The samples were covered in foil
and placed into the -20 \\u00baC freezer for a 48-hr extraction. After this
extraction period, the samples along with 3 prepared blanks of 5ml acetone
were transferred to individual sample cuvettes. Each sample was placed in the
fluorometer to obtain fluorescence values before acidification. The sample was
then removed from the fluorometer, 2 drops of 1.2M hydrochloric acid was
added, and the sample was placed back into the fluorometer to obtain values
after acidification.";
String awards_0_award_nid "788722";
String awards_0_award_number "OPP-1743035";
String awards_0_data_url "http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1743035";
String awards_0_funder_name "NSF Office of Polar Programs (formerly NSF PLR)";
String awards_0_funding_acronym "NSF OPP";
String awards_0_funding_source_nid "713360";
String awards_0_program_manager "Jennifer Burns";
String awards_0_program_manager_nid "50508";
String cdm_data_type "Other";
String comment
"2018 Ross Sea Euphausia crystallorophias grazing rates
Antarctica, R/V Nathaniel B. Palmer cruise NBP18-01, Jan-Feb. 2018
PI: G. Saba (Rutgers U)
version date: 2020-02-10";
String Conventions "COARDS, CF-1.6, ACDD-1.3";
String creator_email "info@bco-dmo.org";
String creator_name "BCO-DMO";
String creator_type "institution";
String creator_url "https://www.bco-dmo.org/";
String data_source "extract_data_as_tsv version 2.3 19 Dec 2019";
String date_created "2020-02-10T19:21:08Z";
String date_modified "2020-02-13T13:51:34Z";
String defaultDataQuery "&time<now";
String doi "10.1575/1912/bco-dmo.792478.1";
String history
"2024-04-25T19:33:59Z (local files)
2024-04-25T19:33:59Z https://erddap.bco-dmo.org/tabledap/bcodmo_dataset_792478.das";
String infoUrl "https://www.bco-dmo.org/dataset/792478";
String institution "BCO-DMO";
String instruments_0_acronym "Fluorometer";
String instruments_0_dataset_instrument_description "Device used specifically to detect chlorophyll fluorescence emission from each krill sample. Used to calculate krill gut fluorescence.";
String instruments_0_dataset_instrument_nid "792510";
String instruments_0_description "A fluorometer or fluorimeter is a device used to measure parameters of fluorescence: its intensity and wavelength distribution of emission spectrum after excitation by a certain spectrum of light. The instrument is designed to measure the amount of stimulated electromagnetic radiation produced by pulses of electromagnetic radiation emitted into a water sample or in situ.";
String instruments_0_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/113/";
String instruments_0_instrument_name "Fluorometer";
String instruments_0_instrument_nid "484";
String instruments_0_supplied_name "Turner 10-AU fluorometer";
String instruments_1_acronym "IKMT";
String instruments_1_dataset_instrument_description "Rectangle framed net (1.75 m x 1.44 m) with 500 um mesh and a non-filtering cod end. Used to collected zooplankton during the Ross Sea cruise.";
String instruments_1_dataset_instrument_nid "792485";
String instruments_1_description
"A trawl with a pentagonal mouth opening and a dihedral depressor vane as part of the mouth opening. IKMTs come in various dimensions (refer to individual dataset documentation).
The original IKMTs were 10 foot (304 cm) and 15 foot (457 cm) at the mouth. The 10 foot IKMT net was 31 feet (9.45 m) in length (Wiebe and Benfield 2003).";
String instruments_1_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L22/current/NETT0071/";
String instruments_1_instrument_name "Isaacs-Kidd Midwater Trawl";
String instruments_1_instrument_nid "715";
String instruments_1_supplied_name "Isaacs-Kid Midwater Trawl";
String keywords "bco, bco-dmo, biological, bucket, Bucket_number, chemical, chemistry, chlorophyll, concentration, concentration_of_chlorophyll_in_sea_water, data, dataset, dmo, E1_Chlorophyll_a_ug_L, E1_Krill_length_mm, E1_Phaeopigment_ug_L, E2_Chlorophyll_a_ug_L, E2_Krill_length_mm, E2_Phaeopigment_ug_L, E3_Chlorophyll_a_ug_L, E3_Krill_length_mm, E3_Phaeopigment_ug_L, E4_Chlorophyll_a_ug_L, E4_Krill_length_mm, E4_Phaeopigment_ug_L, earth, Earth Science > Oceans > Ocean Chemistry > Chlorophyll, erddap, interval, krill, Krill_number, length, management, measurement, minutes, number, ocean, oceanography, oceans, office, phaeopigment, preliminary, science, sea, seawater, time, Time_Interval_minutes, water";
String keywords_vocabulary "GCMD Science Keywords";
String license "https://www.bco-dmo.org/dataset/792478/license";
String metadata_source "https://www.bco-dmo.org/api/dataset/792478";
String param_mapping "{'792478': {}}";
String parameter_source "https://www.bco-dmo.org/mapserver/dataset/792478/parameters";
String people_0_affiliation "Rutgers University";
String people_0_person_name "Grace Saba";
String people_0_person_nid "721369";
String people_0_role "Principal Investigator";
String people_0_role_type "originator";
String people_1_affiliation "Woods Hole Oceanographic Institution";
String people_1_affiliation_acronym "WHOI BCO-DMO";
String people_1_person_name "Nancy Copley";
String people_1_person_nid "50396";
String people_1_role "BCO-DMO Data Manager";
String people_1_role_type "related";
String project "bio-acoustic plankton surveys";
String projects_0_acronym "bio-acoustic plankton surveys";
String projects_0_description
"NSF Award Abstract:
The Ross Sea is the one of the most productive regions in Antarctica and supports large populations of several key species in the Ross Sea food web, including copepods, crystal krill (Euphausia crystallorophias), and Antarctic silverfish (Pleuragramma antarcticum). Copepods and crystal krill dominate the diets of Antarctic silverfish, the dominant fish species in the high Antarctic zone, and silverfish are a major link between lower (copepods, krill) and higher (fishes, marine mammals, flighted birds, Adélie and Emperor penguins) trophic levels. Despite the significance of these key species, there is limited understanding of copepod, krill, and silverfish mesoscale distribution, spatial structure of age/maturity classes, and their interactions with physical drivers within the Ross Sea. Autonomous underwater profiling gliders are a developing technology that offers the potential for providing high spatial, temporal, and depth resolution data on regional scales. The project will test the capability of a multi-frequency echo sounder integrated into a Slocum Webb glider with the aim of providing the first glider-based acoustic assessment of simultaneous distributions of three trophic levels in the Ross Sea. Complementary glider sensors measuring physical, chemical, and biological parameters will provide mesoscale and sub-mesoscale hydrographic information from which phytoplankton-zooplankton-fish interactions and the relationships between these organisms and physics drivers (sea ice, circulation features) will be investigated. The approach proposed here, glider acoustics, is relatively new and has the potential to be transformational for investigating food webs and the Ross Sea ecosystem.
Researchers will modify and integrate an Acoustic Zooplankton and Fish Profiler (AZFP) multi-frequency echo sounder into a Slocum Webb G2 glider with the capability to differentiate between krill and other types of zooplankton, including copepods, and different sizes of krill and silverfish. The AZFP will be complemented with the existing glider sensors including a CTD, a WET Labs BB2FL ECO puck configured for simultaneous chlorophyll fluorescence (phytoplankton biomass) and optical backscatter measurements, and an Aanderaa Optode for measuring dissolved oxygen. The new sensor suite will be tested during a four-week glider deployment, where it will conduct acoustic surveys to map distribution and abundance of multiple zooplankton taxa and silverfish during the austral summer along the Terra Nova Bay polynya ice shelf and in adjacent continental shelf waters. The relationships between phytoplankton-zooplankton-fish distributions and the physical drivers of zooplankton and silverfish species and size distributions will be investigated. Coordinated ship-based acoustic sampling and net tows/trawls will be conducted multiple times during the glider deployment to validate glider acoustic-based species, size, and abundance measurements. Open accessible, automated data produced during this project will be made available through RUCOOL (Rutgers University Center for Ocean Observing Leadership) and THREDDS (Thematic Real-time Environmental Data Distribution System). The production of consistent, vertically-resolved, high resolution glider-based acoustic measurements will define a successful outcome of this project that should help in identifying the challenges in their use as a potentially cost-effective, automated examination of food webs in the Antarctic.";
String projects_0_end_date "2019-07";
String projects_0_geolocation "Terra Nova Bay, Western Ross Sea, Antarctica";
String projects_0_name "Using Bio-acoustics on an Autonomous Surveying Platform for the Examination of Phytoplankton-zooplankton and Fish Interactions in the Western Ross Sea";
String projects_0_project_nid "788723";
String projects_0_start_date "2017-08";
String publisher_name "Biological and Chemical Oceanographic Data Management Office (BCO-DMO)";
String publisher_type "institution";
String sourceUrl "(local files)";
String standard_name_vocabulary "CF Standard Name Table v55";
String summary "Four experiments using the gut fluorescence/gut evacuation technique were conducted during the R/V Nathaniel B. Palmer cruise NBP1801 in Jan-Feb 2018 to determine grazing rates of crystal krill, Euphausia crystallorophias.";
String title "Grazing rates of Euphausia crystallorophias from RVIB Nathaniel B. Palmer NBP1801 in the Ross Sea, Jan.-Feb. 2018";
String version "1";
String xml_source "osprey2erddap.update_xml() v1.3";
}
}
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selection constraints.
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For example,
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