Average Epilimnetic Conductivity from 1992 to present in Tooli Lake, Arctic LTER, Alaska.

Abstract: 

Average conductivity of the epilimnion (0-3m of water depth) found in Toolik Lake during the month of July.

Project Keywords: 

Data set ID: 

10093

EML revision ID: 

7

Short name: 

ArcticLTER_Lakes_Toolik_JulyEpiCond
People

Keywords: 

Arctic LTER keywords: 

Dates

Date Range: 

Wednesday, July 1, 1992 to Wednesday, July 1, 2009

Publication Date: 

Sunday, December 12, 2010

Methods: 

For Data from 2007 thru 2009 measurements were taken with a DS5 Hydrolab Datasonde. Depth reading on sonde was calibrated in the field so that a depth of 0m was the water surface. For profiles, measurements were taken at surface (~0m) then at 1m intervals until bottom. Measurements were recorded on a Surveyor 4 Datalogger.
For Data from 2001 thru 2006 measurements were taken with a DS4a Hydrolab Datasonde. Depth reading on sonde was calibrated in the field so that a depth of 0m was the water surface. For profiles, measurements were taken at surface (~0m) then at 1m intervals until bottom. Measurements were recorded on a Surveyor 4 Datalogger.
For Data from 1993 thru 2000 measurements were taken with a Hydrolab H20-BT STd multiprobe. For profiles, measurements were taken at surface (~0m) then at 1m intervals until bottom. Measurements were recorded on a Surveyor 3 Datalogger.
For Data from 1977 thru 1992 measurements were taken with a YSI model 33 conductivity meter. For profiles, measurements were taken at surface (~0m) then at 1m intervals until bottom.

Daily average specific conductance of the epilimnion was calculated as the mean of all conductivity measurements from the water's surface to three meters of depth on a particular day.

Yearly average specific conductance of the epilimnion was calculated as the mean of all daily average specific conductance of the epilmnion values.

The "Sheet 1" worksheet contains a summary of yearly average specific conductance of the epilimnion values from the "Julyepi" worksheet.

http://ecosystems.mbl.edu/ARC/lakes/protocols.html

Sites sampled.

Download a comma delimited (csv) or Excel file (includes metadata and data sheets).

Use of the data requires acceptance of the data use policy --> Arctic LTER Data Use Policy

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Variables Details

(Variables names are in the first line/row of the CSV file and Excel data sheet.)
Site
  • Label: Site
  • Definition: Site Name: Name of the lake where measurements were taken. There are discrete sampling sites defined by water depth, generally they are at the point of maximum depth.
  • Type: Nominal
  • Missing values: None specified
Date
  • Label: Date
  • Definition: Date readings were taken on.
  • Type: Date/time
  • Date format: dd-mmm-yyyy
  • Missing values: None specified
Dep_m
  • Label: Dep_m
  • Definition: Depth of water measurement taken at starting from the surface as 0.
  • Type: Physical quantity
  • Unit: meter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
Temp_C
  • Label: Temp_C
  • Definition: Water temperature at depth.
  • Type: Physical quantity
  • Unit: celsius
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
Cond_uS
  • Label: Cond_uS
  • Definition: Specific conductivity of the water at depth corrected to 25C.
  • Type: Physical quantity
  • Unit: microsiemenPerCentimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
Daily_Avg_Cond_uS
  • Label: Daily_Avg_Cond_uS
  • Definition: Daily average specific conductivity of the epilimnion (0-3m of depth) corrected to 25C.
  • Type: Physical quantity
  • Unit: microsiemenPerCentimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
Yearly_Avg_Cond_uS
  • Label: Yearly_Avg_Cond_uS
  • Definition: Yearly average specific conductivity of the epilimnion (0-3m of depth) corrected to 25C.
  • Type: Physical quantity
  • Unit: microsiemenPerCentimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured