CTD profiles in Lakes

Summary

Abstract: 

As part of the Long Term Ecological Research (LTER) project in the McMurdo Dry Valleys of Antarctica, a series of Taylor Valley lakes have been monitored for conductivity, temperature and depth. A Seabird 25 CTD (conductivity, temperature, and depth) instrument was used to record temperature profiles in perennial ice covered lakes.

Date Range: 

Friday, January 1, 1993 to Wednesday, December 31, 2014

...or query the data clicking the:

Variables: 

DATASET_CODE
  • Label:
  • Definition: Code to identify the table - used by the data query system
  • Type: Nominal
  • Missing values: None specified
LIMNO_RUN
  • Label:
  • Definition: Code for lake's sampling location and date
  • Type: Nominal
  • Missing values: None specified
LOCATION NAME
  • Label: Location Name
  • Definition: Name of lake where measurement was made
  • Type: Nominal
  • Missing values: None specified
LOCATION CODE
  • Label: Location Code
  • Definition: Code for site where measurement was made, a database integrity constraint too
  • Type: Nominal
  • Missing values: None specified
DEPTH (m)
  • Label:
  • Definition: Depth (below the piezometric water level) derived from pressure using the Seabird software (d = p * 1.019716). Note: The upper 3-6 meters of each CTD cast, depending upon ice thickness for each lake, represents conditions within the ice melt hole and is not representative of actual lake water. It is advised that users of the data review the Lake Ice Thickness dataset in the MCM Database to find where the liquid water column starts for each cast.
  • Type: Physical quantity
  • Unit: meter
  • Maximum: 45
  • Minimum: 1
  • Precision: 1
  • Missing values:
    • NULL = None given
CTD CONDUCTIVITY (mS/cm)
  • Label: CTD Conductivity (mS/cm)
  • Definition: Conductivity measured at lake depth
  • Type: Physical quantity
  • Unit: mS/cm
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • Null = None given
CTD TEMP (C)
  • Label:
  • Definition: Temperature measured at lake depth
  • Type: Physical quantity
  • Unit: celsius
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: 0.1
  • Missing values:
    • Null = None given
CTD COMMENTS
  • Label:
  • Definition: Helpful hints about the CTD measurements
  • Type: Nominal
  • Missing values: None specified
FILE_NAME
  • Label:
  • Definition: Name of file in which data was submitted
  • Type: Nominal
  • Missing values: None specified
DATE_TIME
  • Label:
  • Definition: Date on which sample was gathered
  • Type: Date/time
  • Date format: mm/dd/yyyy
  • Missing values: None specified
WIRE CORRECTED DEPTH (m)
  • Label:
  • Definition: CTD Depth (see DEPTH) corrected with lake specific equations based on the relationship between CTD measured depths, and depths measured by a calibrated winch cable. These corrections are necessary because of the high density of the bottom waters of East and West Lake Bonney, and the offset in the pressure sensor output compared to the winch measured depth at the surface of all lakes.
  • Type: Physical quantity
  • Unit: meter
  • Maximum: 45
  • Minimum: 1
  • Precision: 1
  • Missing values:
    • NULL = None given
DEPTH MASL
  • Label:
  • Definition: Depth referred to the Sea level. Distance below Mean Average Sea water level referen ce from which sample was drawn
  • Type: Physical quantity
  • Unit: meter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: 1
  • Missing values: None specified

DOI: 

10.6073/pasta/8a933f837598e77965150998f35f3890

Short name: 

limno ctd

Data set ID: 

88
People

Owner/Creator: 

Contact: 

Additional Project roles: 

Field Crew
Data Manager