Date Range:
Tuesday, June 15, 2010 to Friday, October 5, 2018
Physical and chemical data for various lakes near Toolik Research Station, Arctic LTER. Summer 2010 to 2021
Download:
ARC_Lakes_Physchem_2010-2021_ver6.xlsx (2.25 MB)
Variables
SortChem_#
- Label: SortChem_#
- Definition: Number used to identify samples - generally not used until later data but column remains with older data to enable comparison
- Type: Nominal
- Missing values: None specified
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
Rounded Depth (m)
- Label: Rounded Depth (m)
- Definition: Depth of water measurement taken at starting from the surface as 0. This depth corresponds with data in other files (Nutrients, Chemistry)
- Type: Physical quantity
- Unit: meter
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- . = Missing or Not Measured
Hydrolab Depth
- Label: Hydrolab Depth
- Definition: Depth measured by hydrolab (where used), otherwise regular measured depth recorded
- Type: Physical quantity
- Unit: meter
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- . = Missing or Not Measured
Time_hr_dst
- Label: Time_hr_dst
- Definition: Exact time that each reading was recorded in Alaska Daylight Savings Time (1 hour ahead of Alaska Standard Time: if 13:00 DST than 12:00 AST)
- Type: Nominal
- Missing values: None specified
IBVSvr4a_V
- Label: IBVSvr4a_V
- Definition: Internal Battery Voltage of the Surveyor 4a Datalogger.
- Type: Physical quantity
- Unit: volt
- 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: Electrical conductivity of the water at depth.
- Type: Physical quantity
- Unit: microsiemenPerCentimeter
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- . = Missing or Not Measured
pH
- Label: pH
- Definition: pH (opposite of the log of the hydrogen ion concentration).
- Type: Physical quantity
- Unit: dimensionless
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- . = Missing or Not Measured
DO_Sat
- Label: DO_Sat
- Definition: The percent saturation of dissolved oxygen at depth.
- Type: Physical quantity
- Unit: percent
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- . = Missing or Not Measured
DO_mg/l
- Label: DO_mg/l
- Definition: The concentration of dissolved oxygen at depth.
- Type: Physical quantity
- Unit: milligramPerLiter
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- . = Missing or Not Measured
DO_umoles/L
- Label: DO_umoles/L
- Definition: The concentration of dissolved oxygen at depth.
- Type: Physical quantity
- Unit: micromolePerLiter
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- . = Missing or Not Measured
Chl_V
- Label: Chl_V
- Definition: In Vivo measurement of chlorophyll-a concentration.
- Type: Physical quantity
- Unit: volt
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- . = Missing or Not Measured
Chl_ug/l
- Label: Chl_ug/l
- Definition: In Vivo measurement of chlorophyll-a concentration.
- Type: Physical quantity
- Unit: microgramPerLiter
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- . = Missing or Not Measured
PAR_uEm2s
- Label: PAR_uEm2s
- Definition: PAR (photosynthetically active radiation) measured below the water surface.
- Type: Physical quantity
- Unit: microEinsteinPerMeterSquaredPerSecond
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- . = Missing or Not Measured
refPAR_uEm2s
- Label: refPAR_uEm2s
- Definition: PAR (photosynthetically active radiation) measured with Deck unit to correct for changes in ambient light.
- Type: Physical quantity
- Unit: microEinsteinPerMeterSquaredPerSecond
- Maximum: Not specified
- Minimum: Not specified
- Precision: Not specified
- Missing values:
- . = Missing or Not Measured
Hydrolab
- Label: Hydrolab
- Definition: This field indicates which Hydrolab Datasonde instrument was used to take measurements
- Type: Nominal
- Missing values: None specified
Secchi_m
- Label: Secchi_m
- Definition: Measure of water transparency by depth a 22 cm Secchi Disk is visible to in meters (note where indicated "greater than" due to disk hitting the bottom before disappearing).
- Type: Nominal
- Missing values: None specified
Notes
- Label: Notes
- Definition: Any additional information pertaining to measurements made for a particular depth, place and time.
- Type: Nominal
- Missing values: None specified