2009-10 Sub-ice Current Velocities Recorded with an Acoustic Doppler Current Profiler

Summary

Abstract: 

On 7 January 2010, a SonTek Argonaut-XR 1.5 MHz Acoustic Doppler Current Profiler (ADCP) was fixed at the bottom of the lake ice in the Lake Hoare Limno Hole inside the Polar Haven, looking downward through the water column. Every 10 seconds, the ADCP measured horizontal and vertical current velocities in ten, 30-cm-thick cells between 0.5 and 3.5 m below the lake ice. Over 32.5 hours, horizontal currents in the shallowest cell (0.5 to 0.8 m below lake ice) had a mean speed of 23.8 cm/sec. This speed was independently validated by lowering a SonTek handheld Acoustic Doppler Velocity (ADV) meter into the ice hole. Horizontal speeds oscillated between 10.1 and 37.5 cm/sec over the course of the ADCP dataset. Fast Fourier Transforms of x-direction velocity data from the shallowest cell identified oscillation periods of 11, 3.7, and 2.5 minutes consistent with the theoretical first-mode longitudinal surface seiche in Lake Hoare. Current direction oscillated between N 78 degrees E and N 289 degrees E along the east-west longitudinal axis of the lake, consistent with the behavior of a seiche.

Date Range: 

Thursday, January 1, 2009 to Friday, December 31, 2010

...or query the data clicking the:

Variables: 

DATASET_CODE
  • Label:
  • Definition: A code used to identify the entity table name and create lists of data holdings
  • Type: Nominal
  • Missing values: None specified
LOCATION NAME
  • Label:
  • Definition: Name of lake where measurement was made
  • Type: Nominal
  • Missing values: None specified
LOCATION CODE
  • Label:
  • Definition: Location in the lake where measurement was made
  • Type: Nominal
  • Missing values: None specified
DATE_TIME
  • Label: Attribute Label
  • Definition: Date on which sample was gathered
  • Type: Date/time
  • Date format: mm/dd/yy H:M:S
  • Missing values: None specified
MIN_DEPTH (m)
  • Label:
  • Definition: Minimum Depth value for the measurement range
  • Type: Physical quantity
  • Unit: meter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified
MAX_DEPTH (m)
  • Label:
  • Definition: Maximum Depth value for the measurement range
  • Type: Physical quantity
  • Unit: meter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • Required entry = None given
SAMPLE_ID
  • Label:
  • Definition: An internal identifier for the record
  • Type: Nominal
  • Missing values: None specified
Vx (cm/s)
  • Label:
  • Definition: the velocity component for the X-axis - East-West, where positive values mean fluid moving towards the west
  • Type: Physical quantity
  • Unit: centimetersPerSecond
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: 0.5
  • Missing values: None specified
Vy (cm/s)
  • Label:
  • Definition: the velocity component for the Y-axis - North-South, where positive values mean fluid moving towards the north
  • Type: Physical quantity
  • Unit: centimetersPerSecond
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: 0.5
  • Missing values: None specified
Vz (cm/s)
  • Label:
  • Definition: the velocity component for the Z-axis - Bottom-Up, where positive values mean fluid moving towards the bottom (down)
  • Type: Physical quantity
  • Unit: centimetersPerSecond
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: 0.5
  • Missing values: None specified
Spd_xy
  • Label:
  • Definition: the magnitude of the velocity (the speed) on the horizontal plane for the x-axis
  • Type: Physical quantity
  • Unit: centimetersPerSecond
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: 0.5
  • Missing values: None specified
Dir
  • Label:
  • Definition: THe orientation of the velocity vector on the horizontal plane
  • Type: Physical quantity
  • Unit: degree
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values: None specified

DOI: 

10.6073/pasta/d0581ca1c77a0d70dbe67b7581beaf70

Short name: 

ADCP-ID.74

Data set ID: 

74
People

Owner/Creator: 

Contact: 

Additional Project roles: 

Associated Researcher