North Pole Environmental Observatory (NPEO) oceanographic mooring data, 2001-2002

Federal Geographic Data Committee (FGDC) Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Morison, J., K. Aagaard, R. Moritz, M. McPhee, A. Heiberg, M. Steele, and R. Andersen
Publication_Date: 20051121
Title: North Pole Environmental Observatory (NPEO) oceanographic mooring data, 2001-2002
Edition:
Geospatial_Data_Presentation_Form:
Series_Information:
Series_Name: NPEO
Issue_Identification:
Publication_Information:
Publication_Place: Boulder, CO
Publisher: National Snow and Ice Data Center (NSIDC)
Other_Citation_Details:
Online_Linkage: http://nsidc.org/data/arcss156.html
Description:
Abstract:
This data set, acquired with an oceanographic bottom-anchored mooring, includes sea-ice draft and depth data, conductivity, temperature, pressure, salinity, and ocean current measurements such as speed and direction. Each mooring contains vertically distributed instruments, which measure ocean properties at fixed depths and record data internally. These data are retrieved annually when the mooring is recovered. Located on the Pole Abyssal Plain about 50 kilometers from the North Pole, the 2001 mooring was chosen because it provided a suitable landing site for the supporting aircraft. Ocean depth was approximately 4300 m. Data were recorded half-hourly to hourly from 1 April 2001 through 27 April 2002. The North Pole Environmental Observatory (NPEO) is a year-round, automated scientific observatory, deploying various instruments each April in order to learn how the world's northernmost sea helps regulate global climate. It consists of a set of unmanned scientific platforms that record oceanographic, cryospheric, and atmospheric data throughout the year. More information about the project is available at the project Web site, (http://psc.apl.washington.edu/northpole/) North Pole Environmental Observatory. Data are in ASCII text format and are available via FTP.
Purpose:
Not Available
Supplemental_Information:
Not Available
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20010401
Ending_Date: 20020427
Currentness_Reference:Unknown
Status:
Progress: In Work
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Description_of_Geographic_Extent:
Bounding_Coordinates:
West_Bounding_Coordinate: 66.64694
East_Bounding_Coordinate: 66.64694
North_Bounding_Coordinate: 89.556946
South_Bounding_Coordinate: 89.556946
Keywords:
Theme:
Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS
Theme_Keyword_Thesaurus: GCMD PLATFORM
Theme_Keyword_Thesaurus: GCMD INSTRUMENT
Theme_Keyword_Thesaurus: PROJECT
Theme_Keyword_Thesaurus: ANCILLARY KEYWORDS
Theme_Keyword_Thesaurus: ISO TOPIC CATEGORY
Theme_Keyword_Thesaurus: DATA SET LANGUAGE
Theme_Keyword: EARTH SCIENCE > CRYOSPHERE > SEA ICE > SEA ICE MOTION
Theme_Keyword: EARTH SCIENCE > OCEANS > OCEAN CIRCULATION > OCEAN CURRENTS
Theme_Keyword: EARTH SCIENCE > OCEANS > OCEAN PRESSURE > SEA LEVEL PRESSURE
Theme_Keyword: EARTH SCIENCE > OCEANS > OCEAN PRESSURE > WATER PRESSURE
Theme_Keyword: EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE
Theme_Keyword: EARTH SCIENCE > OCEANS > SALINITY/DENSITY > CONDUCTIVITY
Theme_Keyword: EARTH SCIENCE > OCEANS > SALINITY/DENSITY > SALINITY
Theme_Keyword: EARTH SCIENCE > OCEANS > SEA ICE > SEA ICE MOTION
Theme_Keyword: EARTH SCIENCE > OCEANS > SEA ICE > SALINITY
Theme_Keyword: GROUND-BASED OBSERVATIONS
Theme_Keyword: MOORINGS
Theme_Keyword: CONDUCTIVITY METERS
Theme_Keyword: CURRENT METERS
Theme_Keyword: PRESSURE SENSORS
Theme_Keyword: THERMISTORS
Theme_Keyword: UPWARD LOOKING SONAR
Theme_Keyword: RADIO TRANSPONDERS
Theme_Keyword: TRANSPONDERS
Theme_Keyword: ARCSS > ARCTIC SYSTEM SCIENCE
Theme_Keyword: NSF/OPP > OFFICE OF POLAR PROGRAMS, NATIONAL SCIENCE FOUNDATION
Theme_Keyword: ARCSS/NPEO > ARCTIC SYSTEM SCIENCE/NORTH POLE ENVIRONMENTAL OBSERVATORY
Theme_Keyword: Arcss
Theme_Keyword: Arcss Data Coordination Center
Theme_Keyword: Arcss156
Theme_Keyword: Arctic Sea Ice
Theme_Keyword: Conductivity
Theme_Keyword: Current Meter
Theme_Keyword: North Pole
Theme_Keyword: North Pole Environmental Observatory
Theme_Keyword: Npeo
Theme_Keyword: Nsidc > National Snow And Ice Data Center
Theme_Keyword: Ocean Water Conductivity Measurements
Theme_Keyword: Ocean Water Salinity
Theme_Keyword: Ocean Water Salinity Measurements
Theme_Keyword: Ocean Water Temperature Measurements
Theme_Keyword: Opp-0352754
Theme_Keyword: Opp-9910305
Theme_Keyword: Pressure
Theme_Keyword: Salinity
Theme_Keyword: Sea Ice
Theme_Keyword: Sea Ice Draft
Theme_Keyword: Water Pressure
Theme_Keyword: CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
Theme_Keyword: ENGLISH
Place:
Place_Keyword_Thesaurus: GCMD
Place_Keyword: OCEAN > ARCTIC OCEAN
Place_Keyword: GEOGRAPHIC REGION > ARCTIC
Place_Keyword: GEOGRAPHIC REGION > POLAR
Access_Constraints: Not Available
Use_Constraints:
Not Available
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: ROGER ANDERSEN
Contact_Person_Primary:
Contact_Person: NSIDC USER SERVICES
Contact_Position: TECHNICAL CONTACT
Contact_Position: TECHNICAL CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Polar Science Center
Address: Applied Physics Laboratory
Address: University of Washington
Address: 1013 NE 40th
City: Seattle
State_or_Province: WA
Postal_Code: 98105-6698
Country: USA
Contact_Address:
Address_Type: Mailing and Physical Address
Address: National Snow and Ice Data Center
Address: CIRES, 449 UCB
Address: University of Colorado
City: Boulder
State_or_Province: CO
Postal_Code: 80309-0449
Country: USA
Contact_Voice_Telephone: 1+206-543-1258
Contact_Voice_Telephone: +1 (303) 492-6199
Contact_Facsimile_Telephone: 1+206-616-3142
Contact_Facsimile_Telephone: +1 (303) 492-2468
Contact_Electronic_Mail_Address: roger@apl.washington.edu
Contact_Electronic_Mail_Address: nsidc@nsidc.org
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Pressure is readily checked for consistency between different instruments, noting. However, investigators noted that precise ocean depth is difficult to determine and that line length errors are possible. The 2001-2002 mooring was well positioned with respect to depth. Four pressure sensors near the top of the mooring report instrument depths within 2 m of design depths. One sensor on RCM-7, serial number 11455, the only current meter recording pressure, reported itself some 7 m deeper than designed. The investigators accept as correct those four pressure measurements, located both above and below the suspect RCM, suggesting an erroneous offset in the one RCM pressure sensor. Consequently, a constant pressure was assigned to the 84 m design depth and used in the salinity calculation for that RCM. However, for completeness the pressure as measured is reported in the data file, and those measurements provide information on pull-down of the RCM. The deep Sea-Bird instruments, SBE-37s with serial numbers 1772, 1773, and 1774, unfortunately suffered from the failure of a new pressure sensor, which was subsequently confirmed by the manufacturer as flawed. These three instruments do report temperature and conductivity with good accuracy, and constant pressures inferred from the design depths are used in the calculation of salinity at those levels. Note that no pressure correction has been made for pull-down of these instruments, as is also the case for RCM serial number 11455. A stuck vane or malfunctioning compass afflicted RCM serial number 6545 at 600 m, constraining the direction to one-third of its full arc, while current speed appears reasonable. Both speed and direction are reported as measured. General information about the North Pole Environmental Observatory, the NPEO mooring, and various data extracts and summaries may be viewed on the NPEO website. See Bottom-Anchored Mooring (http://psc.apl.washington.edu/northpole/Mooring.html). Potentially important sources of error in the sea-ice draft computed as described above include the following: *Systematic and random errors in density rhow *Systematic and random errors in sound speed cbar *Random errors in sea-level air pressure Ps *Errors in the local value of earth's gravitational acceleration g *Timing variations in the sonar hardware/software system *Target identification errors for first-return echoes from targets not directly above the ULS, or from targets intervening between the ULS and the intended target (ice bottom or sea surface) *Non-hydrostatic (short) waves during open water intervals Extensive analysis, as reported in Moritz (2005) yields a net systematic error of approximately +0.3 meters, a standard deviation of random errors of approximately 0.05 meters during the summer, and an annual variation of systematic error on the order of 0.10 meters for ULS 22 at NPEO 2001-2002. The summertime random errors show some persistence over intervals of at least several hours. An offset correction was applied to both the 5-minute and 10-second time series, by identifying occurrence of open water based on a combined analysis of the ULS and ADCP data. The offset correction eliminates most of the net systematic error, and greatly reduces the random errors in summer. The offset has been applied to the data set provided here. Once the offsets are applied, summer (June-August) sea-ice drafts between -0.10 m and +0.10 m are reset to 0 m, consistent with the range of error variability for open water episodes and with the model that ice thinner than 10 cm is rare during these months. For all other months, sea-ice drafts between -0.05m and 0 m are reset to zero. Sea-ice drafts outside the range -0.05 m < draft < 20 m are replaced by the bad data value -999. This results in data with all sea-ice drafts in the interval 0 m to 20 m. The ULS is programmed to look for sea-ice drafts in a window that opens approximately 20 meters below sea level.
Logical_Consistency_Report:
Not Available
Completeness_Report:
Not Available
Lineage:
Process_Step:
Process_Description:
Not Available
Process_Date: Unknown
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Spatial_Reference_Information:
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: NSIDC > National Snow and Ice Data Center
Contact_Person: NSIDC USER SERVICES
Contact_Position: DATA CENTER CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: National Snow and Ice Data Center
Address: CIRES, 449 UCB
Address: University of Colorado
City: Boulder
State_or_Province: CO
Postal_Code: 80309-0449
Country: USA
Contact_Voice_Telephone: +1 (303) 492-6199
Contact_Facsimile_Telephone: +1 (303) 492-2468
Contact_Electronic_Mail_Address: nsidc@nsidc.org
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: NSIDC_ARCSS > Arctic System Science Data Coordination Center
Contact_Person: NSIDC ARCSS USER SERVICES
Contact_Position: DATA CENTER CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: National Snow and Ice Data Center
Address: CIRES, 449 UCB
Address: University of Colorado
City: Boulder
State_or_Province: CO
Postal_Code: 80309-0449
Country: USA
Contact_Voice_Telephone: +1 (303) 492-6199
Contact_Facsimile_Telephone: +1 (303) 492-2468
Contact_Electronic_Mail_Address: nsidc@nsidc.org
Resource_Description: arcss156
Distribution_Liability:
Not Available
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ASCII text
Transfer_Size: 28 MB uncompressed, 6.2 MB compressed
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://nsidc.org
Access_Instructions:
DATA CENTER URL
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://nsidc.org/arcss/
Access_Instructions:
DATA CENTER URL
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://psc.apl.washington.edu/northpole/index.html...
Access_Instructions:
NPEO Home Page
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://nsidc.org/data/arcss088.html
Access_Instructions:
North Pole Environmental Observatory Aerial CTD Survey
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://nsidc.org/data/arcss095.html
Access_Instructions:
Seawater Chemistry from the North Pole Environmental Observatory, 2000-2004
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://nsidc.org/data/arcss127.html
Access_Instructions:
North Pole Environmental Observatory (NPEO) Weather and Radiation Buoy Data, 2002-2004
Fees: Not Available
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Metadata_Reference_Information:
Metadata_Date: 20050922
Metadata_Review_Date: 20120511
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: GCMD User Support Office
Contact_Organization: NASA Global Change Master Directory
Contact_Address:
Address_Type: Mailing and Physical Address
Address: Not Available
City: Lanham
State_or_Province: MD
Postal_Code: 20706
Country: USA
Contact_Voice_Telephone: Not Available
Contact_Electronic_Mail_Address: gcmduso@gcmd.gsfc.nasa.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
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