Details and Metadata

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Methods

The methods followed in the creation of the dataset, including description of field, laboratory and processing steps, and quality control procedures

Current Methods

  • Sampling overview
    Started: 2015-04-21

    The sensors on the Shelburne Pond buoy are continuously "sampled", with averages recorded over 15 minute intervals. The sampling rate varies across sensors (see below), therefore the number of samples used for average values for each 15 minutes varies among some sensors.

  • Water Temperature
    Started: 2015-04-21

    Six temperature sensors measure water temperature in celsius along a thermistor chain, with Sensor 1 nearest the buoy and sensor 6 at the deepest end of the chain.

    Quality Control Measures: At start and end of field seasons, all six temperature sensors are placed in same mixed water bath to evaluate precision among sensors.

  • Dissolved Oxygen
    Started: 2015-04-21

    Dissolved oxygen is measured by two sensors, one near the buoy and one on the thermistor chain near the end.

    Instrumentation: Sensorex DO6400

    Quality Control Measures: Sensor is calibrated in air-saturated water according to manufacturer's instructions.

  • Chlorophyll
    Started: 2015-04-21

    In vivo chlorophyll fluorescence is measured

    Instrumentation: Turner Designs CYCLOPS submersible fluorometer, Serial No. 2180559

    Quality Control Measures: Calibrate to deionized water for zero reading. Measure for relative chlorophyll fluorescence.

  • Phycocyanin
    Started: 2015-04-21

    In vivo phycocyanin fluoresence is measured

    Instrumentation: Turner Designs CYCLOPS submersible fluorometer, Serial No. 2180560

    Quality Control Measures: Calibrate to deionized water for zero reading. Measure for relative phycocyanin fluorescence.

  • pH
    Started: 2015-04-21

    In vivo pH of the water is measured

    Instrumentation: Campbell Scientific CSIM11

    Quality Control Measures: Calibrated at pH 7 and pH 10 solutions

  • Conductivity
    Started: 2015-04-21

    The specific conductance of the water is regularly measured

    Instrumentation: Global water conductivity sensor WQ301F

    Quality Control Measures: Calibrated by manufacturere for specific conductance

  • Depth
    Started: 2015-04-21

    Depth range measured using transducer

    Instrumentation: Airmar NMEA 0183 DT800

  • Wind
    Started: 2015-04-21

    True (vs relative) wind direction and wind speed in knots are measured

    Instrumentation: Airmar 150WX, ID 3075418

    Quality Control Measures: Calibrated by manufacturer (test procedure 96-154-02)

  • Solar Radiation
    Started: 2015-04-21

    Incoming solar radiation in W per m^2 is measured with a pyranometer

    Instrumentation: Kipp & Zonen CMP 6, Serial No. 133626

    Quality Control Measures: Calibrated by manufacturer (certificate no. 008116133626)

  • Meteorology
    Started: 2015-04-21

    Meteorological conditions are regularly measured, including temperature, humidity and barometric pressure

    Instrumentation: Airmar 150WX, ID 3075418

    Quality Control Measures: Calibrated by manufacturer (test procedure 96-154-02)

  • Position
    Started: 2015-04-21

    Buoy heading, location and altitude are measured

    Instrumentation: Airmar 150WX, ID 3075418

    Quality Control Measures: Calibrated by manufacturer (test procedure 96-154-02)

Dataset Fields

Detailed documentation of the fields comprising the dataset, including the type of measurement, units where applicable, and any controlled vocabularies or code lists present in the data


Field Name Caption Description Additional Information
DATETIMEDate and time of observation

Date and time of observation

Measurement type: DateTime
Date/Time Format: YYYY-MM-DD hh:mm:ss
DATEDate of observation

Date of observation

Measurement type: DateTime
Date/Time Format: YYYY-MM-DD
TIMEGreenwich time of observation

Greenwich time of observation

Measurement type: DateTime
Date/Time Format: hh:mm:ss
S_TEMPERATURE_1Water temperature depth 1

Depth 1 is closest to the buoy (nearest surface) on the thermistor chain

Measurement type: Interval
Unit: unavailable
Precision: 0.01
S_TEMPERATURE_2Water temperature depth 2

Depth 2 is next below depth 1 on the thermistor chain; degrees Celsius

Measurement type: Interval
Unit: unavailable
Precision: 0.01
S_TEMPERATURE_3Water temperature depth 3

Depth 3 is next below depth 2 on the thermistor chain; degrees Celsius

Measurement type: Interval
Unit: unavailable
Precision: 0.01
S_TEMPERATURE_4Water temperature depth 4

Depth 4 is next below depth 3 on the thermistor chain; degrees Celsius

Measurement type: Interval
Unit: unavailable
Precision: 0.01
S_TEMPERATURE_5Water temperature depth 5

Depth 5 is next below depth 4 on the thermistor chain; degrees Celsius

Measurement type: Interval
Unit: unavailable
Precision: 0.01
S_TEMPERATURE_6Water temperature depth 6

Depth 6 is furthest from the buoy (nearest bottom) on the thermistor chain; degrees Celsius

Measurement type: Interval
Unit: unavailable
Precision: 0.01
S_DISSOLVED_O2_1Dissolved oxygen near surface

Dissolved oxygen sensor approximately 1 m below surface; mg/L

Measurement type: Ratio
Unit: unavailable
Precision: 0.01
S_DISSOLVED_O2_2Dissolved oxygen at 3m

Dissolved oxygen sensor approximately 3 m below surface; mg/L

Measurement type: Ratio
Unit: unavailable
Precision: 0.01
S_DISSOLVED_O2_3Dissolved oxygen at 4m

Dissolved oxygen sensor approximately 4 m below surface

Measurement type: Ratio
Unit: unavailable
Precision: 0.01
S_DISSOLVED_O2_4Dissolved oxygen near bottom

Dissolved oxygen sensor near bottom, approximately 0.5 m above bottom under calm conditions

Measurement type: Ratio
Unit: unavailable
Precision: 0.01
S_CHLOROPHYLLChlorophyll fluorescence

Relative units of chlorophyll fluorescence

Measurement type: Ratio
Unit: unavailable
Precision: 0.000001
S_PHYCOCYANINPhycocyanin fluorescence

Relative units of phycocyanin fluorescence

Measurement type: Ratio
Unit: unavailable
Precision: 0.000001
S_DEPTH_MDepth range

Depth range from the transducer to bottom; requires offset from surface to get true depth; m

Measurement type: Ratio
Unit: unavailable
Precision: 0.01
S_WIND_ANGLE_TRUEWind direction

Direction from which the wind is blowing; degrees

Measurement type: Interval
Unit: unavailable
Precision: 0.1
S_WIND_SPEED_NWind speed

Speed of wind; knots (nautical miles per hour)

Measurement type: Ratio
Unit: unavailable
Precision: 0.01
S_SOLAR_RADIATIONIncoming solar radiation

Irradiance in W/m^2

Measurement type: Ratio
Unit: unavailable
Precision: 0.1
S_TEMPERATURE_AIRAir temperature

Air temperature; degrees Celsius

Measurement type: Interval
Unit: unavailable
Precision: 0.01
S_RELATIVE_HUMIDITYAir relative humidity

Air relative humidity in %

Measurement type: Interval
Unit: unavailable
Precision: 0.1
S_PRESSURE_BARBarometric pressure

Air pressure in Bars

Measurement type: Interval
Unit: unavailable
Precision: 0.000001
S_HEADINGBuoy heading

Direction the buoy is facing; for purposes here, the heading faces north which is the backside of the solar panels; degrees

Measurement type: Interval
Unit: unavailable
Precision: 0.1
S_LATITUDEBuoy latitude

Buoy latitude in decimal degrees

Measurement type: Interval
Unit: unavailable
Precision: 0.00000001
S_LONGITUDEBuoy longitude

Buoy longitude in decimal degrees

Measurement type: Interval
Unit: unavailable
Precision: 0.00000001
S_ALTITUDEBuoy altitude

altitude above sea level; m

Measurement type: Ratio
Unit: unavailable
Precision: 0.1
GENERIC_1Wind speed

Speed of wind; m/sec

Measurement type: Ratio
Unit: unavailable
Precision: 0.01
GENERIC_2Open channel

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Measurement type:
GENERIC_3Open channel

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Measurement type:
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Measurement type:
GENERIC_5Open channel

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Measurement type:
GENERIC_6Open channel

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Measurement type:
GENERIC_7Open channel

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Measurement type:
GENERIC_8Open channel

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Measurement type:
GENERIC_9Open channel

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Measurement type:
GENERIC_10Open channel

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Measurement type:
GENERIC_11Open channel

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Measurement type:
GENERIC_12Open channel

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Measurement type:
GENERIC_13Open channel

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Measurement type:
GENERIC_14Open channel

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Measurement type:
GENERIC_15Open channel

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Measurement type:
GENERIC_16Open channel

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Measurement type:
GENERIC_17Open channel

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Measurement type:
GENERIC_18Open channel

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Measurement type:
GENERIC_19Open channel

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Measurement type:
GENERIC_20Open channel

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Measurement type:
S_PHpH values

pH of the lake water. Collection ended 11/3/2015 2:44:00 PM.

Measurement type: Interval
Units: dimensionless
Precision: 0.01
S_CONDUCTIVITYSpecific conductivity

Conductivity of water standardized to 25 degrees celsius; uS/m. Collection ended 11/3/2015 2:44:00 PM.

Measurement type: Ratio
Unit: unavailable
Precision: 0.1

Sampling Equipment

Equipment and software used to collect data, including how that equipment was used.

Current Equipment


  • Started: 2015-04-21

    The sensors on the Shelburne Pond buoy are continuously "sampled", with averages recorded over 15 minute intervals. The sampling rate varies across sensors (see below), therefore the number of samples used for average values for each 15 minutes varies among some sensors.

    Frequency: 15 minutes


  • Started: 2015-04-21

    Temperature is sampled at 0.166 Hz

    Frequency: 0.1667 Hz


  • Started: 2015-04-21

    Dissolved oxygen, chlorophyll, phycocyanin and pH are sampled at 2 Hz

    Frequency: 2 Hz


  • Started: 2015-04-21

    Depth is sampled at 1 Hz

    Frequency: 1 Hz


  • Started: 2015-04-21

    Meteorological conditions and buoy position and orientation are sampled at 1 Hz

    Frequency: 1 Hz

Site Characteristics

The spatial extent of the dataset site coverage, and descriptions of the spatial extent and context for the data collection

  • Site Description

    Northern end of Shelburne Pond in Shelburne, Vermont, USA