2010 Met Buoy Data, Klondike Study Area, NE Chukchi Sea

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Frequently anticipated questions:


What does this data set describe?

Title: 2010 Met Buoy Data, Klondike Study Area, NE Chukchi Sea
Abstract:
The 2010 Met Buoy Data, Klondike Study Area, NE Chukchi Sea dataset contains meteorological data collected for ConocoPhillips and Statoil on two buoys moored in the NE Chukchi Sea during the open water season, July to September 2010. The buoys were located within the Klondike study area, a 30 x 30 nautical mile region that is located in the Chukchi Sea outer continental shelf oil and gas lease area. Met buoy data parameters include wind direction, wind speed, maximum wind speed, air temperature, relative humidity, air pressure, water temperature, significant wave and maximum wave heights, wave period, current speed and direction, and the voltage of the battery used to operate the meteorological instrumentation on the buoy.
Supplemental_Information:
This metadata file has not been reviewed by the contractor who created the data set. Buoy Description Built by Sunbacker Fiberglass in Monroe, Washington, Buoy 101 and 102 were identical with bodies approximately 9 feet in diameter and 42 inches in height. The buoys were fiberglass and filled with foam. The tower on which most of the instruments were mounted was constructed of aluminum and measured eight feet in height. Temperature, humidity, and barometer sensors were mounted just below the top rung of the tower. The wind instrument was mounted approximately 10 feet above the water surface. The bridle, on which the mooring system was attached, was stainless steel and extended about four feet below the buoy. An Aquadopp current meter and a Sea-Bird water temperature sensor were installed on the bridle about four feet below the top of the buoy. The wave sensor was located inside the hull. Solar cells and a wind generator were provided to keep the batteries charged. Instrumentation and Electronics The buoys were equipped with R.M. Young temperature, humidity, and pressure instruments. Temperature, humidity, and wind data were passed through an R.M. Young serial device that also contained an internal compass. An R.M. Young sonic wind device corrected for true north with the internal compass. Instrumentation included a TRIAXYS directional wave sensor, an Aquadopp current meter, and a Sea-Bird water temperature instrument. The buoy was also equipped with an Iridium Short Burst satellite modem and a GPS device. The controller module was a WinSystems single board computer that ran Windows XP. A power controller was used to interface the solar cells and wind generator with the batteries.
  1. How should this data set be cited?

    Fairweather Leasing, LLC, Unknown, 2010 Met Buoy Data, Klondike Study Area, NE Chukchi Sea.

    Online Links:

    • pacmars.eol.ucar.edu

  2. What geographic area does the data set cover?

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 26-Jul-2010
    Beginning_Time: 4:00:00
    Ending_Date: 07-Oct-2010
    Ending_Time: 10:43:00
    Currentness_Reference: ground condition

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: tabular digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      Indirect_Spatial_Reference: North East Chukchi Sea

    2. What coordinate system is used to represent geographic features?

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude.

  7. How does the data set describe geographic features?

    Met Buoy
    A met buoy or meteorological buoy collects information about the ocean and the weather. The buoys in this data set, 101 and 102, were moored to the floor of the Chukchi Sea while instruments onboard the buoys recorded weather data (air temperature, air pressure, and wind data) as well as ocean data (water temperature, water current data, and wave data). (Source: Fairweather Leasing, LLC Annual Report)

    DATE_TIME_ADT
    Local date and time data was collected, in mm/dd/yyyy hh:mm:ss 24hr clock format, Alaska Daylight Time. (Source: Fairweather Leasing, LLC Annual Report)

    Range of values
    Minimum:0
    Units:Alaska Daylight Time
    Resolution:Seconds

    WDIR_T
    Direction of wind, true north (Source: Fairweather Leasing, LLC Annual Report)

    Range of values
    Minimum:0
    Maximum:360
    Units:Degrees
    Resolution:0.1

    WSPD_KTS
    Wind speed, knots (Source: Fairweather Leasing, LLC Annual Report)

    Range of values
    Minimum:0
    Units:Knots
    Resolution:0.1

    WSPD_MAX_KTS
    Maximum wind speed during the two minute measuring cycle, knots (Source: Fairweather Leasing, LLC Annual Report)

    Range of values
    Minimum:0
    Units:Knots
    Resolution:0.1

    ATMP_C
    Air temperature, degrees Celsius (Source: Fairweather Leasing, LLC Annual Report)

    Range of values
    Minimum:0
    Units:Celsius
    Resolution:0.01

    RH_PCT
    Percent relative humidity (Source: Fairweather Leasing, LLC Annual Report)

    Range of values
    Units:Percent Relative Humidity
    Resolution:0.1

    APRES_MB
    Air pressure, millibars (Source: Fairweather Leasing, LLC Annual Report)

    Range of values
    Units:Millibars
    Resolution:0.01

    WTMP_SB_C
    Water temperature, degrees Celsius (Source: Fairweather Leasing, LLC Annual Report)

    Range of values
    Units:Celsius
    Resolution:0.01

    WAVE_SIG_M
    Significant wave height, meters (Source: Fairweather Leasing, LLC Annual Report)

    Range of values
    Units:Meters
    Resolution:0.01

    WAVE_MAX_M
    Maximum wave height, meters (Source: Fairweather Leasing, LLC Annual Report)

    Range of values
    Units:Meters
    Resolution:0.01

    WAVE_PRD_S
    Wave period in seconds (Source: Fairweather Leasing, LLC Annual Report)

    Range of values
    Units:Seconds
    Resolution:0.01

    CRNT_SPD_M_S
    Water current speed, meter per second (Source: Fairweather Leasing, LLC Annual Report)

    Range of values
    Units:Meters per second
    Resolution:0.001

    CRNT_DIR_T
    Direction of water current, true north (calculated) (Source: Fairweather Leasing, LLC Annual Report)

    Range of values
    Minimum:0
    Maximum:360
    Units:Degrees
    Resolution:0.01

    CRNT_DIR_M
    Direction of water current, magnetic north (Source: Fairweather Leasing, LLC Annual Report)

    Range of values
    Minimum:0
    Maximum:360
    Units:Degrees
    Resolution:0.01

    WTMP_AQ_C
    Water temperature from the Aquadopp current meter, degrees Celsius (Source: Fairweather Leasing, LLC Annual Report)

    Range of values
    Units:Celsius
    Resolution:0.01

    VOLT
    Voltage as supplied to the wave meter (Source: Fairweather Leasing, LLC Annual Report)

    Range of values
    Units:Volts
    Resolution:0.01

    BUOY_ID
    Name used to identify individual buoys (Source: Fairweather Leasing, LLC Annual Report)

    ValueDefinition
    101Unique buoy identification.
    102Unique buoy identification.

    LATITUDE
    Latitude of buoy location in decimal degrees NAD83. (Source: Fairweather Leasing, LLC Annual Report)

    Range of values
    Minimum:0
    Maximum:90
    Units:Decimal degrees
    Resolution:0.01

    DEPTH_M
    Depth of water, in meters, at buoy location. (Source: Fairweather Leasing, LLC Annual Report)

    Range of values
    Minimum:0
    Units:Meters
    Resolution:0.01

    LONGITUDE
    Longitude of buoy location in decimal degrees NAD83. (Source: Fairweather Leasing, LLC Annual Report)

    Range of values
    Minimum:-180
    Maximum:0
    Units:Decimal degrees
    Resolution:0.01

    DATA_FLAG
    Indicates that there is missing, interpolated, suspect data or a combination of missing, interpolated, or suspect data within the row. (Source: Metadata Author)

    ValueDefinition
    Interpolated DataData row contains interpolated data. DATA_FLAG_NOTE lists fields with interpolated data.
    Missing and Interpolated DataData row contains both missing and interpolated data. DATA_FLAG_NOTE lists fields with interpolated data.
    Missing DataData row contains missing data.
    Suspect and Interpolated DataData row contains suspect values and interpolated data. DATA_FLAG_NOTE lists fields with interpolated data. Suspect data replaced with "-999" value.
    Suspect and missing dataData row contains suspect and missing data. Suspect data replaced with "-999" value.
    Suspect dataData row contains suspect data. Suspect data replaced with "-999" value.
    Suspect, Missing, and Interpolated DataData row contains suspect, missing, and interpolated data. DATA_FLAG_NOTE lists fields with interpolated data. Suspect data replaced with "-999" value.

    DATA_FLAG_NOTE
    Describes fields that contain interpolated data within the row. (Source: Metadata Author)

    Entity_and_Attribute_Overview:
    This data set contains met buoy meteorological data comprising weather and ocean data. Weather data includes wind direction, wind speed, maximum wind speed, air temperature, air pressure, and relative humidity. Ocean data includes water temperature, significant wave heights, wave periods, maximum wave heights, and current speed and direction. Other data includes buoy identification, GPS location of buoy deployments, as well as water depth at the deployment location and voltage of the battery onboard the buoy. A data flag and a data flag note have been added to make note of suspect, missing, and interpolated data.
    Entity_and_Attribute_Detail_Citation: Fairweather Leasing, LLC


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    ConocoPhillips and Statoil would like to express their appreciation to Olgoonik Fairweather, LLC and Fairweather Leasing, LLC for their efforts in creating this data set.

  3. To whom should users address questions about the data?

    ConocoPhillips
    Senior Scientist
    ConocoPhillips, 700 G Street
    Anchorage, AK 99501

    Contact_Instructions:
    Please contact Data Distributor for information about obtaining data (see Distribution Information in metadata).


Why was the data set created?

These data are part of a multi-year baseline environmental studies data set collected as part of the permitting process prior to drilling exploration wells.


How was the data set created?

  1. From what previous works were the data drawn?

  2. How were the data generated, processed, and modified?

    Date: 26-Jul-2010 (process 1 of 23)
    Buoy 101 deployed

    Date: 28-Jul-2010 (process 2 of 23)
    Buoy 102 deployed

    Date: 28-Jul-2010 (process 3 of 23)
    Buoy 102 shut down.

    Date: 30-Jul-2010 (process 4 of 23)
    Buoy 102 restarted.

    Date: 31-Jul-2010 (process 5 of 23)
    Buoy 102 shut down.

    Date: 10-Aug-2010 (process 6 of 23)
    Buoy 102 deployed after being brought onboard support vessel for service.

    Date: 15-Aug-2010 (process 7 of 23)
    Buoy 102 current meter and water temperature recordings stopped.

    Date: 17-Aug-2010 (process 8 of 23)
    Buoy 102 current meter and water temperature recordings started again.

    Date: 23-Aug-2010 (process 9 of 23)
    Buoy 102 current meter stopped again.

    Date: 24-Aug-2010 (process 10 of 23)
    Buoy 102 wave meter shutdown, followed by buoy controller.

    Date: 05-Sep-2010 (process 11 of 23)
    Buoy 102 deployed after being brought onboard support vessel for service, current data recorded internally on meter for duration of deployment.

    Date: 18-Sep-2010 (process 12 of 23)
    Buoy 101 retrieved for end of season.

    Date: 26-Sep-2010 (process 13 of 23)
    Buoy 102 air temperature and humidity stopped recording.

    Date: 27-Sep-2010 (process 14 of 23)
    Buoy 102 wind and air pressure data stopped recording.

    Date: 30-Sep-2010 (process 15 of 23)
    Buoy 102 wave data stopped recording.

    Date: 07-Oct-2010 (process 16 of 23)
    Buoy 102 retrieved for end of season.

    (process 17 of 23)
    Buoy 101 and 102 data retrieved from buoy computers (text files).

    (process 18 of 23)
    Buoy 101 and 102 data in text file format sent to Fairweather Leasing, LLC.

    (process 19 of 23)
    Buoy 101 and 102 data text file imported into Excel, visually checked for missing observations and bad data, graphically viewed, and formatted for delivery to sponsor.

    (process 20 of 23)
    Buoy 101 and 102 data delivered to ConocoPhillips.

    Date: 23-Feb-2012 (process 21 of 23)
    Buoy 101 and 102 data transferred in Excel file format from ConocoPhillips to Resource Data Inc.

    Date: 20-Mar-2012 (process 22 of 23)
    Buoy 101 and 102 data formatted for delivery to NOAA, metadata created.

    Date: 30-Jul-2012 (process 23 of 23)

  3. What similar or related data should the user be aware of?


How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

    Attribute accuracy was tested by visually reviewing data retrieved from buoy 101 and 102. Each data element was visually scanned for missing observations or bad data. In addition, data were plotted in graphs to better determine if data values were outliers and or bad data. Data that did not appear to be accurate was flagged as "suspect". Suspect values were removed from the data set and replaced with a value of "-999". Where data values are missing, the fields are left blank. Missing values are due to problems with buoy instruments and the buoy battery as described below. Suspect, missing, or interpolated data have been flagged in the DATA_FLAG field, and fields with interpolated data have been identified in the DATA_FLAG_NOTE field. Met Buoy 101 Buoy Operation and Missing Data Met Buoy 101 was deployed on 7/24/2010 at approximately 04:00:00 Alaska Daylight Time (AKDT). The buoy operated continuously until 9/16/2010 00:15:00 AKDT when it stopped recording. It then resumed operation on 9/18/2010 at 15:15:00 AKDT and ran until 9/18/2010 19:45:00 AKDT when it stopped again and did not resume operating. It was later discovered that it stopped operating due to low battery voltage. When the buoy was recovered on 10/7/2010, the batteries were recharged, and the buoy resumed operating while on deck of the support vessel. Data Errors Interpolated Data There were a few instances when a data element was not recorded every 15 minutes. In those cases, the missing data were interpolated from adjacent cells. Interpolation was done by averaging values recorded before and after the missing data. Data rows that contain interpolated data have been flagged in the DATA_FLAG and DATA_FLAG_NOTE fields. Wind Data Two time errors occurred within the wind data. After Buoy 101 was deployed, it was discovered that the clock on the wind device was running approximately 0.8% slower than the clock on the controller on the buoy. Additionally, an error occurred when the controller was reading data from other sensors, which resulted in the per-second wind data being time stamped by the same time. A computer program was written to use the adjacent observations to fill in the missing wind data. Over the course of the deployment, there were six days where several hours of wind data were not recorded. The reason for this is unknown. Met Buoy 102 Buoy Operation and Missing Data Met buoy 102 was deployed on 7/28/2010 at approximately 15:15:00 AKDT . The buoy operated for approximately 1 hour and 30 minutes before it shut down. Buoy 102 was started again on 7/30/2010 at approximately 22:30:00 AKDT and operated for 2 hours and 15 minutes before shutting down again early on 7/31/2010. Data collected during these two time periods of operation appear to be accurate. Buoy 102 was brought aboard the support vessel for repairs and then deployed again on 08/10/2010. Only wave, current, and water temperature observations resumed with this deployment; missing data were interpolated as possible. On 8/15/2010, data recordings from the current meter and water temperature stopped, and then started up again on 8/17/2010. Current measurements again stopped recording on 8/23/2010. On 8/24/2010, the wave meter shut down, and the buoy controller ceased to function shortly afterwards. During this period, only the water temperature was recorded. The reason for the shutdown was low battery voltage. The reason for the meteorological sensors failure to operate is unknown, but damage is suspected. Solar cells were damaged, presumably by wave action and the pressure sensor had been submerged; it had water in it and had to be replaced. The buoy was again brought on board the support vessel and the batteries recharged. Buoy 102 was redeployed on 9/5/2010 15:00:00 AKDT . Wind data collected at this time was suspect and replaced with "-999". On 9/26/2010 6:15:00 AKDT air temperature and humidity data stopped recording, followed on 9/27/2010 12:15:00 AKDT by wind and pressure data and on 9/30/2010 at 14:45:00 AKDT by wave data. Water temperature continued to be measured through the end of the month to 10/1/2010. After deployment on 9/5/2010 the current data were not recorded on the buoy controller but data were stored internally on the meter through 10/7/2010 10:43:00 AKDT . Data were imported into the current data set from the meter. Note: The currents were measured at 10 minute intervals and the recorded times were at 3, 13, 23, 33, 43, and 53 minutes past the hour. To match the times of the 15 minute observations, 3, 13, 33, and 43 were used for the 00, 15, 30, and 45 minute observation. Errors There are many missing observations of various elements. Where possible, the missing data was interpolated from adjacent cells. Wind measurements during the month of September 2010 are not considered reliable due to many instances of wind speed jumping to over 100 knots and many instances where the wind speed did not change for long periods. These data values were replaced with "-999" to indicate that they were unreliable.

  2. How accurate are the geographic locations?

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    Data that did not appear to be accurate were flagged as "suspect". Suspect values were removed from the dataset and replaced with a value of "-999". Where data values are missing, the fields were left blank. Suspect, missing, or interpolated data have been flagged in the DATA_FLAG field, and fields with interpolated data have been identified in the DATA_FLAG_NOTE field. See Attribute Accuracy Report for detailed information regarding missing, suspect, and interpolated data.

  5. How consistent are the relationships among the observations, including topology?

    Data were visually scanned and then graphed to check for data quality. Wind measurements during the month of September 2010 were not considered reliable due to many instances of wind speed jumping to over 100 knots and many instances where the wind speed did not change for long periods that didn't correlate with other data. Another instance of suspect data includes anomalous water temperatures. These data values were replaced with "-999" to indicate that they were unreliable.


How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None
Use_Constraints:
User shall not employ selective use of this data; data must be used in its entirety. User must comprehend all information contained within the metadata, especially as it pertains to data quality and spatial coverage of data. User must ensure that the most recent version of data and metadata are used. Acknowledgment of data originator and all points of contact listed for data would be appreciated.

  1. Who distributes the data set? (Distributor 1 of 1)

    National Center for Atmospheric Research
    Attn: Earth Observing Laboratory
    3450 Mitchell Lane
    Boulder, CO 80301
    USA

    303-497-8154 (voice)
    codiac@ucar.edu

  2. What's the catalog number I need to order this data set?

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    ConocoPhillips and Statoil make no representation or warranty, express or implied, with regard to any of these data or metadata, as used alone or in combination with another data set, and expressly disclaim any representation or warranty. It is the responsibility of the data user to fully comprehend the metadata before use of the data. Each person accessing or using the data or metadata assumes all risks and all liabilities arising from or associated with such access or use. ConocoPhillips and Statoil shall have no responsibility or liability for any damages caused by any errors or omissions in the data or metadata or by improper or incorrect use of the data or metadata.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 02-Aug-2012
Metadata author:
ConocoPhillips
Senior Scientist
ConocoPhillips, 700 G Street
Anchorage, AK 99501

Contact_Instructions:
Please contact Data Distributor for information about obtaining data (see Distribution Information in metadata).
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)


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