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

Federal Geographic Data Committee (FGDC) Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Reference_Information
• Distribution_Information
• Metadata_Reference_Information

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

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

Spatial_Reference_Information:

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

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