Douglas Lake Aggregate Data 1913-2016

Chemical and physical properties data collected by multiple investigators in South Fishtail Bay and the Pells Island Depression between 1913 and 2016.

Variables
ID
  • Label: Identification number
  • Definition: Discrete identification number assigned to each observation.
  • Type: Nominal
  • Missing values: None specified
investigator
  • Label: Investigator
  • Definition: Researcher or investigator who collected the observation.
  • Type: Code list
  • Codes:
    • welch-eggleton = Paul S. Welch and Frank E. Eggleton
    • miller = Donald E. Miller
    • glover = Rebecca Glover
    • tucker = Allan Tucker
    • rann = NSF Project: Research Applied to National Needs
    • lind = Owen Lind
    • tuchman = Nancy Tuchman
    • bvk = Bob Vande Kopple
    • class = UMBS class measurement
  • Missing values: None specified
Date_mmddyyyy
  • Label: Date
  • Definition: Date of the observation.
  • Type: Date/time
  • Date format: mm/dd/yyyy
  • Missing values: None specified
site
  • Label: Site
  • Definition: Site where the observation was made.
  • Type: Code list
  • Codes:
    • sfbay = South Fishtail Bay
    • pells = Pells Island Depression
  • Missing values: None specified
instrument
  • Label: Instrument
  • Definition: Instrument used to make the observation.
  • Type: Code list
  • Codes:
    • HYDROLAB = Hydrolab Multi-Probe Meter
    • YSI = Yellow State Instrument meter
    • YSI57 = YSI Dissolved Oxygen Meter
    • Quanta = Hydrolab Quanta Multi-Probe Meter
    • Eureka = Eureka meter
    • IN_LAB = measurements taken from samples in the lab
  • Missing values: None specified
depth_m
  • Label: Depth in meters
  • Definition: Depth of the observation in meters.
  • Type: Physical quantity
  • Unit: meter
  • Maximum: 0
  • Minimum: 22
  • Precision: Not specified
  • Missing values: None specified
temp_c
  • Label: Temperature degrees Celsius
  • Definition: Temperature in degrees Celsius at the depth of the observation.
  • Type: Physical quantity
  • Unit: celsius
  • Maximum: 29.4
  • Minimum: 0
  • Precision: .01
  • Missing values: None specified
DO
  • Label: Dissolved oxygen
  • Definition: Dissolved oxygen content at the depth of the observation.
  • Type: Physical quantity
  • Unit: milligramsPerLiter
  • Maximum: 17
  • Minimum: 0
  • Precision: .01
  • Missing values: None specified
pH
  • Label: pH
  • Definition: pH at the depth of the observation.
  • Type: Nominal
  • Missing values: None specified
%SAT
  • Label: Percent saturation
  • Definition: Dissolved oxygen content relative to complete saturation at observation depth and temperature
  • Type: Nominal
  • Missing values: None specified
Conduct
  • Label: Conductivity
  • Definition: Electrical conductivity at the depth of the observation.
  • Type: Physical quantity
  • Unit: microMhosPerCentimeter
  • Maximum: 510
  • Minimum: 48
  • Precision: 1
  • Missing values: None specified
Free_CO2
  • Label: Free carbon dioxide
  • Definition: Free carbon dioxide content at the depth of the observation.
  • Type: Physical quantity
  • Unit: milligramsPerLiter
  • Maximum: 41
  • Minimum: 0
  • Precision: .1
  • Missing values: None specified
P-Alk.
  • Label: Carbonate alkalinity
  • Definition: Alkalinity from the presence of carbonates at the depth of the observation.
  • Type: Physical quantity
  • Unit: milligramsPerLiter
  • Maximum: 138
  • Minimum: 0
  • Precision: .1
  • Missing values: None specified
T-Alk.
  • Label: Total alkalinity
  • Definition: The measure of all species of alkalinity at the depth of the observation.
  • Type: Physical quantity
  • Unit: milligramsPerLiter
  • Maximum: 180
  • Minimum: 0
  • Precision: .1
  • Missing values: None specified
Ca
  • Label: Calcium
  • Definition: Calcium content at the depth of the observation.
  • Type: Physical quantity
  • Unit: milligramsPerLiter
  • Maximum: 43.13
  • Minimum: 14.55
  • Precision: .01
  • Missing values: None specified
Mg
  • Label: Magensium
  • Definition: Magnesium content at the depth of the observation.
  • Type: Physical quantity
  • Unit: milligramsPerLiter
  • Maximum: 14.8
  • Minimum: 4.6
  • Precision: .1
  • Missing values: None specified
Na
  • Label: Sodium
  • Definition: Sodium content at the depth of the observation.
  • Type: Physical quantity
  • Unit: milligramsPerLiter
  • Maximum: 6.82
  • Minimum: 1.09
  • Precision: .01
  • Missing values: None specified
Cl
  • Label: Chlorine
  • Definition: Chlorine content at the depth of the observation.
  • Type: Physical quantity
  • Unit: milligramsPerLiter
  • Maximum: 7.2
  • Minimum: 1.4
  • Precision: .01
  • Missing values: None specified
ChlA
  • Label: Chlorophyll
  • Definition: Chlorophyll abundance at the depth of the observation.
  • Type: Physical quantity
  • Unit: milligramsPerCubicMeter
  • Maximum: 10.98
  • Minimum: .23
  • Precision: .01
  • Missing values: None specified
PhaeA
  • Label: Phaeophyta
  • Definition: Phaeophyta abundance at the depth of the observation.
  • Type: Physical quantity
  • Unit: milligramsPerCubicMeter
  • Maximum: 9.8
  • Minimum: -1.29
  • Precision: .01
  • Missing values: None specified
Si
  • Label: Silicon
  • Definition: Silicon content at the depth of the observation.
  • Type: Physical quantity
  • Unit: milligramsPerLiter
  • Maximum: 3.64
  • Minimum: .15
  • Precision: .01
  • Missing values: None specified
SPO4
  • Label: Soluble phosphate
  • Definition: Soluble phosphate or SRP (soluble reactive phosphate) concentration at the depth of the observation.
  • Type: Physical quantity
  • Unit: microgramsPerLiter
  • Maximum: 136.6
  • Minimum: 0
  • Precision: .1
  • Missing values: None specified
TPO4
  • Label: Total phosphate
  • Definition: Total phosphate content at the depth of the observation.
  • Type: Physical quantity
  • Unit: microgramsPerLiter
  • Maximum: 139.4
  • Minimum: 0
  • Precision: .4
  • Missing values: None specified
NO3
  • Label: Nitrate
  • Definition: Nitrate concentration at the depth of the observation.
  • Type: Physical quantity
  • Unit: microgramsPerLiter
  • Maximum: 392
  • Minimum: 1
  • Precision: .1
  • Missing values: None specified
NH3
  • Label: Ammonia
  • Definition: Ammonia concentration at the depth of the observation.
  • Type: Physical quantity
  • Unit: microgramsPerLiter
  • Maximum: 1475.6
  • Minimum: 0
  • Precision: .1
  • Missing values: None specified
TP
  • Label: Total phosphorus
  • Definition: Total phosphorus concentration at the depth of the observation.
  • Type: Physical quantity
  • Unit: microgramsPerLiter
  • Maximum: 50
  • Minimum: 7
  • Precision: .1
  • Missing values: None specified
Data Source Details
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