Long-term observations on the Bering Sea shelf: biophysical moorings at sites 2 and 4 as sentinels for ecosystem change (NPRB Project 203)
Metadata:
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Identification_Information:
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Citation:
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Citation_Information:
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Originator: Phyllis Stabeno, NOAA/PMEL.EcoFOCI
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Originator: Jeffery Napp, NOAA/AFSC, EcoFOCI
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Originator: Terry Whitledge, UAF, Inst. of Marine Science
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Publication_Date: Unpublished material
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Title:
Long-term observations on the Bering Sea shelf: biophysical moorings at sites 2 and 4 as sentinels for ecosystem change (NPRB Project 203)- Geospatial_Data_Presentation_Form: tabular digital data
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Description:
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Abstract:
- Biophysical measurements have been made at mooring Site 2 (56.88°N, 164.03°) almost
continuously since 1995, providing the longest near continuous time-series of
biophysical variables on the Bering Sea shelf. A series of moorings have also been
deployed at Site 4 (57.85°N, 168.87°W) since 1995, providing almost six years of
more sporadic data. Added to the biophysical data collected by the moorings, water
property measurements have been made at locations around the moorings and along the
70-m transect since 1995. Such long-term observations provide critical data that
allow characterizations of interannual variability, quantification of regime shifts
and climate change. This project partially funds continued measurements at both Sites
2 and 4, together with water samples and plankton samples around both mooring sites and
along the monitoring line
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Purpose:
- CTD observations provide critical profile data defining hydrology in areas where moorings have been deployed, supporting these longer-term time series data sets. Transects allow a view of spatial patterns in the water column, allowing characterizations of seasonal and interannual variability, and privide critical calibration for mooring data.
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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: 20030507
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Ending_Date: 20030514
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Currentness_Reference:
- ground condition
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Status:
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Progress: Complete
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Maintenance_and_Update_Frequency: As needed
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Spatial_Domain:
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Description_of_Geographic_Extent:
- Moorings M2 and M4 are located on the southeast Bering Sea shelf near the 70-meter isobath. CTD data are collected over various areas of the southeast Bering Sea shelf during mooring cruises. Casts are taken near the moorings and at other areas of interest, including the Pribilof Islands, near the Aleutian Islands, and along the 70-meter isobath.
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Bounding_Coordinates:
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West_Bounding_Coordinate: -179.00000
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East_Bounding_Coordinate: -157.00000
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North_Bounding_Coordinate: 63.00000
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South_Bounding_Coordinate: 54.00000
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Keywords:
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Theme:
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Theme_Keyword_Thesaurus: None
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Theme_Keyword: CTD
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Theme_Keyword: Oceanography
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Theme_Keyword: Physics
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Theme_Keyword: Biophysical
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Theme_Keyword: temperature profile
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Theme_Keyword: salinity profile
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Theme_Keyword: nitrate
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Theme_Keyword: chlorophyll
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Theme_Keyword: oxygen
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Theme_Keyword: Fluorescence
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Theme_Keyword: temperature
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Theme_Keyword: conductivity
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Theme_Keyword: salinity
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Theme_Keyword: pressure
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Theme_Keyword: mixed layer
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Theme_Keyword: 70-meter isobath
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Place:
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Place_Keyword_Thesaurus: None
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Place_Keyword: Bering Sea
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Place_Keyword: southeast Bering Sea shelf
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Place_Keyword: Pribilof Islands
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Place_Keyword: Aleutian Islands
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Place_Keyword: Alaska
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Place_Keyword: Bristol Bay
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Place_Keyword: M2 mooring
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Place_Keyword: M4 mooring
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Place_Keyword: 70-meter isobath
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Stratum:
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Stratum_Keyword_Thesaurus: None
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Stratum_Keyword: 1-meter averaged surface to near-bottom
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Stratum_Keyword: lower trophic
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Temporal:
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Temporal_Keyword_Thesaurus: None
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Temporal_Keyword: 2003
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Temporal_Keyword: Spring
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Access_Constraints: None
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Use_Constraints:
- Users of data are asked to give credit to the Principal Investigators, and data-gathering and funding agencies.
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Point_of_Contact:
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Contact_Information:
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Contact_Person_Primary:
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Contact_Person: Phyllis Stabeno
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Contact_Organization: NOAA/PMEL/EcoFOCI
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Contact_Address:
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Address_Type: mailing and physical
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Address: 7600 Sand Point Way NE
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Address: Building 3
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City: Seattle
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State_or_Province: Washington
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Postal_Code: 98115
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Country: USA
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Contact_Voice_Telephone: 206-526-6453
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Data_Set_Credit:
- EcoFOCI project (NOAA/PMEL)
University of Washington JISAO
North Pacific Research Board (Project # 203)
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Data_Quality_Information:
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Logical_Consistency_Report:
- not applicable
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Completeness_Report:
- Data are processed using Seabird CTD software and calibration file. Post-processing includes filtering extreme outliers, extrapolation of values from the top value collected at 3-4m to the surface. Each cast is visually reviewed for reasonableness and density inversions (greater than 0.02 sigma-t) caused by spurious measurements. This process is facilitated by comparison of the outputs of the 2 temperature and conductivity sensors. Profile data are bin-averaged to 1 meter. Salinity is derived using Seabird processing software that uses IPTS-68 and PSS-78. see SBE Data Processing manual appendix V:
http://www.seabird.com/pdf_documents/manuals/SBEDataProcessing_7.17a.pdf
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Lineage:
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Methodology:
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Methodology_Type: Field
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Methodology_Description:
- Our CTD is a Seabird 911plus with dual sensors (temperature and conductivity). At each CTD location, the CTD rosette was lowered to 10 meters to equilibrate, brought to surface, then deployed to a close-to-bottom depth, at ~30m/minute down to 150 m (average speed) and ~50m/minute below that. Water bottles were fired at desired depths on the upcast. Ascent was at the same or faster rate. Once on board, numerous water samples were taken from Niskin bottles.
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Process_Step:
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Process_Description:
- Data are processed using Seabird CTD software and calibration file. Bottle salt calibration samples were taken approximately every other cast. Post-processing at the Pacific Marine Environmental Laboratory includes filtering extreme outliers, extrapolation of values from the top value collected at 3-4m to the surface. Each cast is visually reviewed for reasonableness and density inversions (greater than 0.02 sigma-t) caused by spurious measurements. This process is facilitated by comparison of the outputs of the 2 temperature and conductivity sensors. Profile data are bin-averaged to 1 meter. Salinity is derived using Seabird processing software that uses IPTS-68 and PSS-78. see SBE Data Processing manual appendix V: http://www.seabird.com/pdf_documents/manuals/SBEDataProcessing_7.17a.pdf
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Source_Used_Citation_Abbreviation:
- http://www.seabird.com/pdf_documents/manuals/SBEDataProcessing_7.17a.pdf
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Source_Used_Citation_Abbreviation:
- http://www.ecofoci.noaa.gov/efoci_dataDescription.shtml
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Process_Date: Unknown
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Spatial_Reference_Information:
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Horizontal_Coordinate_System_Definition:
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Geographic:
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Latitude_Resolution: 0
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Longitude_Resolution: 0
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Geographic_Coordinate_Units: Decimal degrees
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Entity_and_Attribute_Information:
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Overview_Description:
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Entity_and_Attribute_Overview:
- CTD data set from NOAA Ship Miller Freeman, mooring cruise mf0306, consisting of 18 casts collected May 7-14, 2003.
Each CTD cast creates a vertical profile of data. Primary data types are temperature and conductivity (dual sensors), and pressure. Salinity is derived from these. Additional instruments are added to the deployed package as defined by the study and cruise circumstances. Other variables include chlorophyll fluorescence, nutrients, and Photosynsynthetically Active Radiation (PAR), Chlorophyll and nutrients are collected at selected depths. Other data are averaged to 1-meter depth values.
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Entity_and_Attribute_Detail_Citation:
- http://www.ecofoci.noaa.gov/efoci_dataDescription.shtml
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Metadata_Reference_Information:
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Metadata_Date: 20080501
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Metadata_Contact:
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Contact_Information:
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Contact_Person_Primary:
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Contact_Person: Peggy Sullivan
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Contact_Organization: NOAA/PMEL/EcoFOCI and UW/JISAO
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Contact_Address:
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Address_Type: mailing and physical
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Address: 7600 Sand Point Way NE
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Address: Building 3
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City: Seattle
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State_or_Province: Washington
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Postal_Code: 98115
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Country: USA
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Contact_Voice_Telephone: 206-526-6185
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Contact_Electronic_Mail_Address:
peggy.sullivan@noaa.gov
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Contact_Electronic_Mail_Address:
dave.kachel@noaa.gov
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Metadata_Standard_Name: FGDC Biological Data Profile of the Content Standard for Digital Geospatial Metadata
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Metadata_Standard_Version: FGDC-STD-001-1998
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