Underway Seawater Sampling Aboard NOAA ship Oscar Dyson in 2010, Forage Distribution and Ocean Conditions (B62)
Metadata also available as - [Questions & Answers] - [Parseable text] - [DIF]
Metadata:
- Identification_Information:
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- Citation:
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- Citation_Information:
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- Originator: Cokelet, Edward D.
- Publication_Date: Unpublished material
- Title:
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Underway Seawater Sampling Aboard NOAA ship Oscar Dyson in 2010, Forage Distribution and Ocean Conditions (B62)
- Geospatial_Data_Presentation_Form: digital
- Publication_Information:
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- Publication_Place: Seattle, WA
- Publisher: NOAA/PMEL/EcoFOCI
- Description:
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- Abstract:
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One goal of BSIERP (Bering Sea Integrated Ecosystem Research Program) Project 62: Forage Distribution and Ocean Conditions was to measure oceanographic conditions during each NOAA ship Oscar Dyson cruise in the Bering Sea during the 2008-2010 study period. In early 2008, NOAA/PMEL/EcoFOCI scientists redesigned Dyson's underway seawater system. The ocean temperature, salinity and chlorophyll fluorescence instruments were augmented with nitrate and oxygen sensors and meters to monitor the flow rates in water pumped from the bow seawater intake at approximately 2.5 m depth. The bench fluorometer was replaced by a smaller, submersible one that also measured turbidity. These measurements were combined with the ship's position, speed, heading, pitch, roll, heave, short- and long-wave solar radiation, wind speed and direction, air temperature, relative humidity and barometric pressure. Various instruments recorded at different rates; therefore measurements from individual instruments were interpolated to regular, equispaced time axes and combined into one coherent data set. Maps show the temperature (Figures 1a-d), salinity (Figures 2a-d), nitrate concentration (Figures 3a-d), chlorophyll-a concentration (Figures 4a-d), and oxygen saturation (Figures 5a-d) along the ship track.
- Purpose:
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To measure underway, near-surface oceanographic conditions aboard NOAA ship Oscar Dyson cruises in the Bering Sea, 24 Apr-27 Sep 2010.
- Time_Period_of_Content:
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- Time_Period_Information:
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- Range_of_Dates/Times:
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- Beginning_Date: 20100424
- Ending_Date: 20100927
- Currentness_Reference: observed
- Status:
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- Progress: Complete
- Maintenance_and_Update_Frequency: None planned
- Spatial_Domain:
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- Description_of_Geographic_Extent: Eastern Bering Sea continental shelf
- Bounding_Coordinates:
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- West_Bounding_Coordinate: 178.00000
- East_Bounding_Coordinate: -152.00000
- North_Bounding_Coordinate: 62.5
- South_Bounding_Coordinate: 51.5
- Keywords:
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- Theme_Keyword: Latitude
- Theme_Keyword: Longitude
- Theme_Keyword: HDOP
- Theme_Keyword: SOG
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- Theme_Keyword: Short Wave Solar Radiation
- Theme_Keyword: Long Wave Solar Radiation
- Theme_Keyword: Wind Speed
- Theme_Keyword: Wind Direction
- Theme_Keyword: Air Temperature
- Theme_Keyword: Humidity
- Theme_Keyword: Barometric Pressure
- Theme_Keyword: Water Temperature
- Theme_Keyword: Salinity
- Theme_Keyword: Nitrate
- Theme_Keyword: Fluorescence
- Theme_Keyword: Chlorophyll
- Theme_Keyword: Turbidity
- Theme_Keyword: Oxygen
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SALINITY_CALIB:Salinity:Calibrated Thermosalinograph Salinity:psu
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NITRATE_CALIB:Nitrate:Calibratred ISUS Nitrate Concentration:mcmol/l
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- Place_Keyword: Bering Sea
- Temporal:
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- Temporal_Keyword_Thesaurus: None
- Temporal_Keyword: 24 April-27 September 2010
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Access is restricted. Data policy: <http://www.eol.ucar.edu/projects/best/program_management_plan.pdf>
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Figure 1a: Map of temperature along ship track during Oscar Dyson cruise DY1003
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- Browse_Graphic_File_Name: Figure_1b.gif
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Figure 1b: Map of temperature along ship track during Oscar Dyson cruise DY1004
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- Browse_Graphic_File_Name: Figure_1c.gif
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Figure 1c: Map of temperature along ship track during Oscar Dyson cruise DY1006
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- Browse_Graphic_File_Name: Figure_1d.gif
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Figure 1d: Map of temperature along ship track during Oscar Dyson cruise DY1007
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- Browse_Graphic_File_Name: Figure_2a.gif
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Figure 2a: Map of salinity along ship track during Oscar Dyson cruise DY1003
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- Browse_Graphic_File_Name: Figure_2b.gif
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Figure 2b: Map of salinity along ship track during Oscar Dyson cruise DY1004
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- Browse_Graphic_File_Name: Figure_2c.gif
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Figure 2c: Map of salinity along ship track during Oscar Dyson cruise DY1006
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- Browse_Graphic_File_Name: Figure_2d.gif
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Figure 2d: Map of salinity along ship track during Oscar Dyson cruise DY1007
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- Browse_Graphic_File_Name: Figure_3a.gif
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Figure 3a: Map of nitrate along ship track during Oscar Dyson cruise DY1003
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- Browse_Graphic_File_Name: Figure_3b.gif
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Figure 3b: Map of nitrate along ship track during Oscar Dyson cruise DY1004
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- Browse_Graphic_File_Name: Figure_3c.gif
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Figure 3c: Map of nitrate along ship track during Oscar Dyson cruise DY1006
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- Browse_Graphic_File_Name: Figure_3d.gif
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Figure 3d: Map of nitrate along ship track during Oscar Dyson cruise DY1007
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- Browse_Graphic_File_Name: Figure_4a.gif
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Figure 4a: Map of chlorophyll-a along ship track during Oscar Dyson cruise DY1003
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- Browse_Graphic_File_Name: Figure_4b.gif
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Figure 4b: Map of chlorophyll-a along ship track during Oscar Dyson cruise DY1004
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Figure 4c: Map of chlorophyll-a along ship track during Oscar Dyson cruise DY1006
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Figure 4d: Map of chlorophyll-a along ship track during Oscar Dyson cruise DY1007
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- Browse_Graphic_File_Name: Figure_5a.gif
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Figure 5a: Map of oxygen saturation along ship track during Oscar Dyson cruise DY1003
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- Browse_Graphic_File_Name: Figure_5b.gif
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Figure 5b: Map of oxygen saturation along ship track during Oscar Dyson cruise DY1004
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- Browse_Graphic_File_Name: Figure_5c.gif
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Figure 5c: Map of oxygen saturation along ship track during Oscar Dyson cruise DY1006
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- Browse_Graphic_File_Name: Figure_5d.gif
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Figure 5d: Map of oxygen saturation along ship track during Oscar Dyson cruise DY1007
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- Browse_Graphic_File_Name: Figure_6.pdf
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Figure 6: NOAAS Oscar Dyson underway seawater system instrument layout. In this photo the Turner fluorometer was in
use, and the WET Labs fluorometer and Aanderaa oxygen sensor were not yet fully installed.
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- Browse_Graphic:
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- Browse_Graphic_File_Name: Figure_7.gif
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Figure 7: Salinity calibration fit with discrete sample values on the abscissa and detrended underway instrument values on
the ordinate. The blue-dashed line represents an exact fit, and the green solid line is the linear least-squares fit.
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- Browse_Graphic:
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- Browse_Graphic_File_Name: Figure_8.gif
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Figure 8: Nitrate calibration fit with discrete sample values on the abscissa and detrended underway
instrument values on the ordinate. The blue-dashed line represents an exact fit, and the green solid line is the linear
least-squares fit.
- Browse_Graphic_File_Type: GIF
- Browse_Graphic:
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- Browse_Graphic_File_Name: Figure_9a.gif
- Browse_Graphic_File_Description:
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Figure 9a: Chlorophyll-a calibration fit until 1 Jun 2010 with discrete sample values on the abscissa and detrended
underway instrument values on the ordinate. The blue-dashed line represents an exact fit, and the green solid line is the
linear least-squares fit.
- Browse_Graphic_File_Type: GIF
- Browse_Graphic:
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- Browse_Graphic_File_Name: Figure_9b.gif
- Browse_Graphic_File_Description:
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Figure 9b: Chlorophyll-a calibration fit after 1 Jun 2010 with discrete sample values on the abscissa and detrended
underway instrument values on the ordinate. The blue-dashed line represents an exact fit, and the green solid line is the
linear least-squares fit.
- Browse_Graphic_File_Type: GIF
- Browse_Graphic:
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- Browse_Graphic_File_Name: Figure_10.gif
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Figure 10: Oxygen calibration fit with discrete sample values on the abscissa and detrended underway
instrument values on the ordinate until. The blue-dashed line represents an exact fit, and the green solid line is the linear
least-squares fit.
- Browse_Graphic_File_Type: GIF
- Analytical_Tool:
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- Analytical_Tool_Description:
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The data file is a self-documenting NetCDF file that meets the COARDS NetCDF standards. It was generated by Ferret software.
- Tool_Access_Information:
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- Online_Linkage: <http://www.unidata.ucar.edu/software/netcdf/>
- Online_Linkage: <http://ferret.wrc.noaa.gov/Ferret/>
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<http://www.unidata.ucar.edu/software/netcdf/>
<http://ferret.wrc.noaa.gov/Ferret/>
- Data_Quality_Information:
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- Attribute_Accuracy:
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- Attribute_Accuracy_Report:
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Ship-provided sensors that measured position, attitude, speed and course over ground, short- and long-wave solar radiation, wind speed and direction, air temperature and humidity, and barometric pressure were maintained and calibrated by NOAA’s Marine Operations Center-Pacific according to their own schedule. The radiometer measuring solar short- and long-wave rediation did not work correctly during the 2010 field season, and those data are set to empty. The ship's heading was measured by a gyrocompass and an Applanix POS MV attitude determination system that also measured pitch, roll and heave. The oceanographic thermometer at the water intake was accurate to 0.001 deg. C with a drift within 0.002 deg. C per year according to the manufacturer; therefore a theoretical accuracy of 0.003 degrees would be predicted. Its output was compared to other sources of seawater temperature (3 hull sensors and the thermosalinograph temperature) to exclude large, spurious deviations. The field accuracy for temperature is probably about 0.01 deg. C. The measured temperature within the thermosalinograph, used to compute salinity, exceeded the seawater intake temperature because the former was mounted in a heated laboratory space. Discrete salinity, nitrate, chlorophyll and oxygen samples were collected on a daily schedule (salinity 1/d, nitrate 1/d, chlorophyll 2/d, oxygen 1/d with occasional replicate samples) and preserved (in stoppered 200-ml Kimax borosilicate bottles for salinity; in acid-cleaned 40 ml HDPE Boston Round sample bottles for nitrate and frozen at -80 C; collected in 60-ml plastic sample bottles, filtered through 0.7 micron glass fiber filters and frozen at -80 C for chlorophyll; or collected in 300-ml BOD bottles and 'pickled' with manganous sulphate and alkaline iodide solutions for oxygen) for later analysis in the laboratory aboard ship or in Seattle. Salinity samples were analyzed with a Guildline Autosal laboratory salinometer with a laboratory accuracy better than 0.0001 psu. Nitrate samples were analyzed using a modified method of Armstrong, Stearns and Strickland (1967, Deep Sea Research 14: 381-38) with a typical laboratory accuracy of 0.5 micromole/l. Chlorophyll samples were analyzed via the acidification method (Lorenzen, 1966, Deep Sea Research 13:223-227) using a Turner Designs AU-10 fluorometer with a typical laboratory accuracy of 10-20%. Oxygen samples were analyzed via the Winkler method (Strickland and Parsons, 1968, A Practical Handbook of Seawater Analysis, p 21-26) with a typical laboratory accuracy of 1 micromole/l. For each instrument with corresponding discrete samples, the instrument and discrete time series were differenced, and the difference trend was assumed to be from instrument drift. The instrument time series was detrended and calibrated against the discrete samples with a linear least-squares fit. Figure 7 shows the fit for salinity for which the correlation coefficient, r-squared, was 0.999 and the standard error was 0.019 psu. The blue-dashed line of slope 1 through the origin represents an exact fit, the green solid line represents the actual fit, and any outliers not included in the fit are designated by red squares. Figure 8 shows the least-squares fit for nitrate with an r-squared value of 0.88 and standard error of 1.03 micromole/l. For chlorophyll, different fits were applied over two time periods. Figure 9a shows the fit before 1 Jun 2010 for chlorophyll with r-squared = 0.64 and errors of 1.60 microgram/l. Figure 9b shows the fit after 1 Jun 2010 for chlorophyll with r-squared = 0.66 and errors of 0.49 microgram/l. Figure 10 shows the fit for oxygen with r-squared = 0.83 and error of 16.7 micromoles/l. The accuracy of the discrete laboratory analyses was greater than that of the field calibrations. Some calibrated values were negative although that is not physically possible, e.g. a negative concentration. They remain negative in the dataset to give another indication of the accuracy of calibrated variables.
- Logical_Consistency_Report:
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Quality control was carried out, time series were scrutinized and plots of variables along the ship track were checked. The data values are within the expected range for these oceanographic variables.
- Completeness_Report:
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Data gaps occur between Bering Sea cruises and where values were deleted that did not meet quality criteria.
- Positional_Accuracy:
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- Horizontal_Positional_Accuracy:
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- Horizontal_Positional_Accuracy_Report: GPS positions should be accurate to within 10 m.
- Lineage:
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- Methodology:
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- Methodology_Type: Field
- Methodology_Description:
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Prior to the 2008 field season, David Strausz, Antonio Jenkins and Edward Cokelet of NOAA/PMEL reconfigured the oceanographic instruments on NOAA ship Oscar Dyson and installed nitrate and oxygen sensors and three electronic flow meters as part of BSIERP. On 10 July 2008, they exchanged the ship's existing Turner Designs 10-AU field fluorometer for a WET Labs ECO fluorometer and rerouted some plumbing lines (Figure 6 ). Starting at the bow inlet at nominally 2.5-m depth, the system consisted of: plastic pipe, a Sea-Bird Electronics (SBE) SBE 38 digital oceanographic thermometer (<http://www.seabird.com/products/spec_sheets/38data.htm>) to measure water temperature at the water intake, a coarse strainer, a paddlewheel flow meter, a pump and a spare that could be switched, a U-pipe with air vent to remove air bubbles, two switchable 50-micron filters, a SUNY (State University of New York) vortex debubbler to remove air bubbles from the water before it reached the instruments, and three electromagnetic flow meters to measure the water flow rates to the thermosalinograph (TSG), nitrate sensor and fluorometer/optode instrument loops. The TSG loop had an SBE 45 MicroTSG thermosalinograph (<http://www.seabird.com/products/spec_sheets/45data.htm>) to measure salinity. The nitrate sensor loop had a 1-micron filter followed by a Satlantic ISUS v3 nitrate sensor (<http://www.satlantic.com/isus>) to measure the dissolved nitrate concentration. The chlorophyll-fluorometer/optode loop had a WET Labs ECO FLNTUS fluorometer (<http://www.wetlabs.com/products/eflcombo/fl.htm>) with turbidity sensor and bio-wiper. It also had an Aanderaa Optode 3835 oxygen sensor (<http://www.aadi.no/Aanderaa/Products/Sensors/OxygenOptode/default.aspx>) to measure the dissolved oxygen concentration. The flow rates were monitored and the filters cleaned whenever the flows dropped too low. The fluorometer, optode and nitrate sensor were cleaned approximately weekly with cotton-tipped swabs, the latter with oxalic acid solution. Data were recorded on the ship's NOAA SCS (Scientific Computer System) at intervals of 1 second to 5 minutes depending upon the instrument.
- Process_Step:
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- Process_Description:
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Dyson's digital position, attitude, speed and course over ground, short- and long-wave solar radiation, wind speed and direction, air temperature and humidity, barometric pressure, underway system flow rates, seawater intake temperature, salinity, nitrate concentration, chlorophyll fluorescence, turbidity, and oxygen concentration were recorded at various rates up to 1 Hz and stored in individual sensor files. Data from each instrument were edited to remove spurious data spikes and extreme values outside ad-hoc thresholds. Also the flow rates through the instrument loops were monitored for low-flow incidents, and those data values flagged as bad. The edited data were linearly interpolated onto a common equi-spaced time axis with 1-minute increments. The nitrate sensor operated at a slower rate. The nitrate concentration was recorded at 2-minute intervals. These measurements were linearly interpolated onto a common equi-spaced time axis with 2-minute increments.
- Process_Date: Unknown
- Process_Contact:
-
- Contact_Information:
-
- Contact_Person_Primary:
-
- Contact_Person: Edward D. Cokelet
- Contact_Organization: NOAA/PMEL
- Contact_Address:
-
- Address_Type: mailing
- Address: 7600 Sand Point Way NE
- City: Seattle
- State_or_Province: WA
- Postal_Code: 98105
- Country: USA
- Contact_Voice_Telephone: 206-526-6820
- Contact_Electronic_Mail_Address: Edward.D.Cokelet@noaa.gov
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- Indirect_Spatial_Reference:
-
Ship track time series of ship's position, speed, heading, pitch, roll, heave, short- and long-wave solar radiation, wind speed and direction, air temperature, relative humidity and barometric pressure, water temperature, salinity, nitrate concentration, chlorophyll-a concentration and dissolved oxygen concentration. The data file is a self-documenting NetCDF file. See <http://www.unidata.ucar.edu/software/netcdf/>
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- Distributor:
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- Contact_Information:
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- Contact_Organization: National Center for Atmospheric Research
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- Address_Type: mailing and physical
- Address: 3450 Mitchell Lane
- City: Boulder
- State_or_Province: CO
- Postal_Code: 80301
- Country: USA
- Contact_Voice_Telephone: 303-497-8154
- Contact_Electronic_Mail_Address: codiac@ucar.edu
- Contact_Electronic_Mail_Address: stott@ucar.edu
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No warranty expressed or implied is made regarding the accuracy or utility of the data, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data. It is strongly recommended that careful attention be paid to the contents of the metadata file associated with the data. The NCAR and NPRB shall not be held liable for improper or incorrect use of the data described and/or contained herein.
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-
- Computer_Contact_Information:
-
- Network_Address:
-
- Network_Resource_Name: <http://beringsea.eol.ucar.edu>
- Digital_Form:
-
- Digital_Transfer_Information:
-
- Format_Name: ASCII
- File_Decompression_Technique: No compression applied
- Digital_Transfer_Option:
-
- Online_Option:
-
- Computer_Contact_Information:
-
- Network_Address:
-
- Network_Resource_Name: <http://beringsea.eol.ucar.edu>
- Fees: None
- Metadata_Reference_Information:
-
- Metadata_Date: 20120522
- Metadata_Contact:
-
- Contact_Information:
-
- Contact_Organization_Primary:
-
- Contact_Organization: National Center for Atmospheric Research
- Contact_Person: Earth Observing Laboratory
- Contact_Address:
-
- Address_Type: mailing and physical
- Address: 3450 Mitchell Lane
- City: Boulder
- State_or_Province: CO
- Postal_Code: 80301
- Country: USA
- Contact_Voice_Telephone: 303-497-8154
- Contact_Electronic_Mail_Address: codiac@ucar.edu
- Contact_Electronic_Mail_Address: stott@ucar.edu
- Metadata_Standard_Name:
-
FGDC Biological Data Profile of the Content Standard for Digital Geospatial Metadata
- Metadata_Standard_Version: FGDC-STD-001.1-1999
This page is <http://www.eol.ucar.edu/projects/bsierp/docs/B62_Cokelet_Oscar_Dyson_2010.html>
Generated by mp version 2.9.23 on Mon Mar 24 15:07:10 2014