Published on
McMurdo Dry Valleys LTER
(
https://mcm.lternet.edu
)
Summary
Abstract:
Between 26 November 2012 and 22 January 2013, a SonTek Argonaut-XR 1.5 MHz Acoustic Doppler Current Profiler (ADCP) was fixed at the bottom of the Limno Sampling Hole in Lake Hoare, looking downward through the water column. Every 30 seconds, the ADCP measured horizontal and vertical current velocities in six, 50-cm-thick cells between 0.5 and 3.5 m below the lake ice. The observation interval became deeper over time as the ADCP platform melted into the lake ice and the lake ice thinned. Data collected from 26 to 30 November represent pre-discharge data when wind and solar radiation were the only forces acting on the lake. Data from 30 November to 8 December transition from pre-discharge to spring freshet conditions on 6 December. Spring freshet was the most dynamic period observed with highest velocities recorded. Data from 8 to 13 December transitioned from the end of spring freshet on 10 December to summer diurnal discharge conditions. Data from the remaining datasets, 13 to 22 December, 22 to 29 December, 29 December to 6 January, 6 to 13 January, and 13 to 22 January, reflect conditions during summer diurnal stream discharge, especially data from 29 December to 6 January. From these observations, solar radiation, wind, glacial runoff during spring
Date Range:
January 1, 2012
to
December 31, 2013
Dataset(s)
Variables (click to expand):
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:
Required entry = None given
SAMPLE_ID
Label:
Definition:
An internal identifier for the record
Type:
Nominal
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
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:
Required entry = None given
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:
Required entry = None given
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:
Required entry = None given
SPD_XY
Label:
Speed_xy (cm/s)
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:
Required entry = None given
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:
Required entry = None given
File:
LIMNO_ANCILLARY_ADCP2.csv
(73.06 MB)
Short name:
ADCP-ID.75
Dataset ID:
75
People
Principal Investigator(s):
Devin N. Castendyk
Contact:
McMurdo Dry Valleys LTER
Associated Personnel:
Data Manager
Inigo San Gil
Source URL:
https://mcm.lternet.edu/content/2012-2013-sub-ice-current-velocities-recorded-acoustic-doppler-current-profiler