Underway Seawater Sampling Aboard F/V Aldebaran in Winter & Summer 2008, Forage Distribution and Ocean Conditions (B62)

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Cokelet, Edward D.
Publication_Date: Unpublished material
Title:
Underway Seawater Sampling Aboard F/V Aldebaran in Winter & Summer 2008, Forage Distribution and Ocean Conditions (B62)
Geospatial_Data_Presentation_Form: digital
Publication_Information:
Publication_Place: Seattle, WA
Publisher: NOAA/PMEL/EcoFOCI
Description:
Abstract:
One goal of BSIERP (Bering Sea Integrated Ecosystem Research Program) Project 62: Forage Distribution and Ocean Conditions was to measure oceanographic conditions from a fishing vessel in the Bering Sea during the winter Pollock A Season fishery, January-March. Winter measurements in the Bering Sea are rare due to the harsh conditions encountered there. In December 2007, NOAA/PMEL/EcoFOCI scientists outfitted Trident Seafoods F/V Aldebaran with instruments to measure water temperature, salinity and chlorophyll concentration in water pumped from the ship’s sea chest at 3 m depth. Outfitting Aldebaran to make oceanographic measurements had another advantage. She was also used by NOAA as a contract survey vessel during the summer Bering Sea bottom trawl surveys in June-July. Therefore summer measurements were gathered from the same instruments. Both data sets are included in the data files. Maps show the temperature (Fig_3_uw_track_t_intake_2008_Pollock_A_Season.gif and Fig_4_uw_track_t_intake_2008_Bottom_Trawl_Survey.gif), salinity (Fig_5_uw_track_s_calib_2008_Pollock_A_Season.gif and Fig_6_uw_track_s_calib_2008_Bottom_Trawl_Survey.gif), and the chlorophyll-a concentration (Fig_7_uw_track_chl_calib_2008_Pollock_A_Season.gif and Fig_8_uw_track_chl_calib_2008_Bottom_Trawl_Survey.gif) along the ship track.
Purpose:
To measure oceanographic conditions from a fishing vessel in the Bering Sea during the winter Pollock A Season fishery, January-March, and the NOAA summer bottom trawl survey, June-July.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20080119
Ending_Date: 20080708
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Description_of_Geographic_Extent: Eastern Bering Sea continental shelf
Bounding_Coordinates:
West_Bounding_Coordinate: -174
East_Bounding_Coordinate: -157
North_Bounding_Coordinate: 62
South_Bounding_Coordinate: 53
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Temperature
Theme_Keyword: Salinity
Theme_Keyword: Chlorophyll
Theme:
Theme_Keyword_Thesaurus: Core Variable Map
Theme_Keyword: Temperature:T_INTAKE
Theme_Keyword: Salinity: S_CALIB
Theme_Keyword: Chlorophyll:CHL_CALIB
Theme:
Theme_Keyword_Thesaurus: Variable Map
Theme_Keyword: S_CALIB:salinity:Calibrated thermosalinograph_salinity:PSU
Theme_Keyword: T_INTAKE:temperature:tintake_temperature:deg C
Theme_Keyword:
CHL_CALIB:chlorophyll:Calibrated Underway Chlorophyll:microgarms/l
Theme_Keyword: LAT_GPS:latitude:GPS Latitude:degrees_north
Theme_Keyword: LON_GPS:longitude:GPS Longitude:degrees_east
Theme_Keyword: T_60_EQ_AX:time:time:SECONDS since 2008-01-01 00:00:00
Theme:
Theme_Keyword_Thesaurus: AOOS Data Services
Theme_Keyword: dsid=BSIERPTSG
Theme_Keyword: db=bsierptsg
Theme_Keyword: dataid=AL08sprTSG
Theme_Keyword: metadata=NPRB/BSIERP/B62_Cokelet_AL08_winter_summer.xml
Theme_Keyword: short_name=BSIERP Thermosalinograph, Winter Summer 2008
Theme_Keyword: long_name_fmt="%s, %s" % (id2, id)
Theme_Keyword: data=datasets/dsid=BSIERPTSG
Theme_Keyword: short_title=BSIERP TSG
Theme_Keyword: id=Cruise
Theme_Keyword: file_type=tracklines
Theme_Keyword: instrument=Thermosalinograph
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: project_number:B62
Theme_Keyword: data_url:<http://data.eol.ucar.edu/codiac/dss/id=245.B62-001>
Theme_Keyword: archive_url:<http://www.eol.ucar.edu/projects/bsierp>
Theme:
Theme_Keyword_Thesaurus: Dataset Map
Theme_Keyword:
id=AL08WinterSummerTSG:FV Aldebaran,Winter Summer 2008/id2=TSG:Thermosalinograph/Ocean color,Salinity,Temperature/fmt
Place:
Place_Keyword_Thesaurus: Geographic Names Information System
Place_Keyword: Bering Seaf
Temporal:
Temporal_Keyword_Thesaurus: None
Temporal_Keyword: 19 January-8 July 2008
Access_Constraints:
Access is restricted. Data policy: <http://www.eol.ucar.edu/projects/best/program_management_plan.pdf>
Use_Constraints:
Use is restricted. Data policy: <http://www.eol.ucar.edu/projects/best/program_management_plan.pdf>
Browse_Graphic:
Browse_Graphic_File_Name: Fig_1_sal_vs_sal_uw_1-jun-2008_31-jul-2008.gif
Browse_Graphic_File_Description:
Figure 1. Least squares fit of thermosalinograph sallinity vs. discrete samples analyzed in the laboratory with an Autosal. The calibration points (in black with neglected outliers in red) and the least squares fit (solid green line) exceed the factory calibrated values which would lie along the black dashed line.
Browse_Graphic_File_Type: GIF
Browse_Graphic:
Browse_Graphic_File_Name: Fig_2_chl_vs_fl_uw_15-jan-2008_08-jul-2008.gif
Browse_Graphic_File_Description:
Figure 2. Least squares fit of factory-calibrated chlorophyll-a from fluorescence vs. discrete samples analyzed in the laboratory via the acidification method. The calibration points (in black with neglected outliers in red) and the least squares fit (solid green line) nearly coincide with factory calibrated values which would lie along the black dashed line.
Browse_Graphic_File_Type: GIF
Browse_Graphic:
Browse_Graphic_File_Name: Fig_3_uw_track_t_intake_2008_Pollock_A_Season.gif
Browse_Graphic_File_Description:
Figure 3. Map of temperature plotted along the ship track of the Pollock A Season.
Browse_Graphic_File_Type: GIF
Browse_Graphic:
Browse_Graphic_File_Name: Fig_4_uw_track_t_intake_2008_Bottom_Trawl_Survey.gif
Browse_Graphic_File_Description:
Figure 4. Map of temperature plotted along the ship track during the summer Bottom Trawl Survey.
Browse_Graphic_File_Type: GIF
Browse_Graphic:
Browse_Graphic_File_Name: Fig_5_uw_track_s_calib_2008_Pollock_A_Season.gif
Browse_Graphic_File_Description:
Figure 5. Map of calibrated salinity plotted along the ship track during the Pollock A Season.
Browse_Graphic_File_Type: GIF
Browse_Graphic:
Browse_Graphic_File_Name: Fig_6_uw_track_s_calib_2008_Bottom_Trawl_Survey.gif
Browse_Graphic_File_Description:
Figure 6. Map of calibrated calibrated salinity plotted along the ship track during the summer Bottom Trawl Survey.
Browse_Graphic_File_Type: GIF
Browse_Graphic:
Browse_Graphic_File_Name: Fig_7_uw_track_chl_calib_2008_Pollock_A_Season.gif
Browse_Graphic_File_Description:
Figure 7. Map of calibrated chlorophyll concentration plotted along the ship track during the Pollock A Season.
Browse_Graphic_File_Type: GIF
Browse_Graphic:
Browse_Graphic_File_Name: Fig_8_uw_track_chl_calib_2008_Bottom_Trawl_Survey.gif
Browse_Graphic_File_Description:
Figure 8. Map of calibrated chlorophyll concentration plotted along the ship track during the summer Bottom Trawl Survey.
Browse_Graphic_File_Type: GIF
Analytical_Tool:
Analytical_Tool_Description:
The data file is a self-documenting NetCDF file that meets the COARDS NetCDF standards. It was generated by Ferret software.
Tool_Access_Information:
Online_Linkage: <http://www.unidata.ucar.edu/software/netcdf/>
Online_Linkage: <http://ferret.wrc.noaa.gov/Ferret/>
Tool_Access_Instructions:
<http://www.unidata.ucar.edu/software/netcdf/> <http://ferret.wrc.noaa.gov/Ferret/>
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The oceanographic thermometer at the water intake is accurate to 0.001 deg. C with a drift within 0.002 deg. C per year according to the manufacturer; therefore an accuracy no worse than 0.003 degrees would be predicted. The sea chest from which this water is extracted is a box of about a 1 cubic m volume located in the engine room, inset in the bottom of the ship with the lower side open to the sea. It is difficult to estimate how much the sea-chest water might be warmed by the ship. We presume that the box is well-flushed when the ship is moving, and we neglect any potential warming. The root-mean-square error of a least-squares fit of thermosalinograph salinity versus 24 discrete samples analyzed in the laboratory was 0.027 psu with an r-squared of 0.998 (Fig_1_sal_vs_sal_uw_1-jun-2008_31-jul-2008.gif). The root-mean-square error of a least-squares chlorophyll fit versus 64 discrete samples was 0.59 micrograms/l with an r-squared of 0.78 (Fig_2_chl_vs_fl_uw_15-jan-2008_08-jul-2008.gif). The estimated accuracies are much smaller than the range of the variables observed; therefore we believe the measurements represent adequately the state of the oceanic environment.
Logical_Consistency_Report:
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. One large data gap exists between the end of the Pollock A Season (12 March 2008) and the start of the summer bottom trawl survey (3 June 2008) because no measurements were made in this time period.
Completeness_Report: Data are consistent.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report: GPS positions should be accurate to within 10 m.
Lineage:
Methodology:
Methodology_Type: Field
Methodology_Description:
David Strausz, Antonio Jenkins and Edward Cokelet installed oceanographic instruments on F/V Aldebaran in December 2007 as part of BSIERP. The instruments were plumbed using copper-nickel pipe by shipyard workers at Trident Seafoods, the ship’s owner, in Seattle. The underway seawater sampling system consists of: 3/4-inch copper-nickel piping from the ship’s sea chest in the engine room drawing water from about 3 m depth to the instruments; 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 strainer to remove large particles; a Hydracell MO3 positive displacement pump with ¼ hp Baldor motor and variable speed drive pumping water at ½ gal/min; a SUNY (State University of New York) vortex debubbler to remove air bubbles from the water before it reaches the instruments; an electromagnetic flow meter to measure the water flow rate in the system; an SBE 45 MicroTSG thermosalinograph (<http://www.seabird.com/products/spec_sheets/45data.htm>) to measure salinity; a WETLabs ECO fluorometer with bio-wiper (<http://www.wetlabs.com/products/eflcombo/fl.htm>) to measure chlorophyll fluorescence; a GPS receiver to measure the ship’s position; and a Windows computer running NOAA’s SCS (Scientific Computer System) to record the observations. Observations were recorded at intervals of 1 second to 1 minute dependent upon the instrument. Discrete salinity and chlorophyll samples were taken daily by a NOAA Fisheries Observer during the Bering Sea Pollock A Season (Jan-Mar) or by a NOAA fisheries scientist during the summer bottom trawl survey (Jun-Jul). These were analyzed in the laboratory after the field season and used to calibrate the salinity and chlorophyll samples.
Process_Step:
Process_Description:
Digital position, flow rate, temperature, salinity and chlorophyll fluorescence observations recorded at various rates were linearly interpolated onto a common time axis with 1-minute increments. Data were determined to be invalid if values fell outside threshold ranges, most commonly because the flow rate was too low or the intake and thermosalinograph temperature difference was too large – both conditions indicating restricted flow. The threshold values were based on common sense and experience gained from working with the data.
Salinity values from the thermosalinograph time series were extracted at the times of the discrete salinity samples that had been analyzed in the laboratory with an Autosal. A least-squares linear fit showed a strong correlation between the digital and discrete samples with a squared correlation coefficient r2=0.998 for N=24 realizations and an rms error=0.027 psu. Figure 1 (Fig_1_sal_vs_sal_uw_1-jun-2008_31-jul-2008.gif) shows the fit. The thermosalinograph and the laboratory values were related by the following least-squares linear fit formula: sal_tsg = 1.005428 sal_discrete - 0.5049629 This equation was inverted and used to scale the digital time series to give the best-fit calibrated salinity concentrations, SAL_CALIB, in the final data file.
Chlorophyll fluorescence was scaled to chlorophyll concentration based upon the fluorometer manufacturer’s specifications. Values from this time series were extracted at the times of the discrete chlorophyll samples that had been analyzed in the laboratory using the acidification method. A least-squares linear fit showed a strong correlation between the digital and discrete samples with a squared correlation coefficient r2=0.78 for N=64 realizations and an rms error=0.59 micrograms/l. Figure 2 (Fig_2_chl_vs_fl_uw_15-jan-2008_08-jul-2008.gif) shows the fit. The seagoing fluorometer’s chlorophyll and the laboratory values were related by the following least-squares linear fit formula: chl_fluorometer = 0.909 chl_discrete_sample + 0.473 This equation was inverted and used to scale the digital time series to give the best-fit calibrated chlorophyll concentrations, CHL_CALIB in the final data file.
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
Process_Step:
Process_Description:
New metadata record established for B62 Cokelet. Prepared from orignial filename Microsoft_Word_Metadata_Template.doc. New name: B62_Cokelet_underway.xml
Process_Date: 20111121
Process_Step:
Process_Description:
Updated metadata record to link with Alaska Marine Information System.
Process_Date: 20091104
Process_Step:
Process_Description:
Split metadata into 2 cruises, spring and summer. Added Dataset Map ids for better REST processing.
Process_Date: 20100804
Spatial_Data_Organization_Information:
Indirect_Spatial_Reference:
Ship track time series of position, water temperature, salinity and chlorophyll concentration. The data file is a self-documenting NetCDF file. See <http://www.unidata.ucar.edu/software/netcdf/>
Direct_Spatial_Reference_Method: Point
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.0001
Longitude_Resolution: 0.0001
Geographic_Coordinate_Units: Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: World Geodetic System of 1984
Ellipsoid_Name: World Geodetic System of 1984
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.25722210088
Vertical_Coordinate_System_Definition:
Depth_System_Definition:
Depth_Datum_Name: Local surface
Depth_Resolution: 2.0
Depth_Distance_Units: meters
Depth_Encoding_Method: Implicit coordinate
Distribution_Information:
Distributor:
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
Distribution_Liability:
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.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: XLS
File_Decompression_Technique: No compression applied
Digital_Transfer_Option:
Online_Option:
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: 20091102
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_AL08_winter_summer.html>
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