Biogeochemistry data set for soil waters, streams, and lakes near Toolik on the North Slope of Alaska.

Abstract: 

Data file describing the biogeochemistry of samples collected at various sites near Toolik Lake, North Slope of Alaska. Sample site descriptors include a unique assigned number (sortchem), site, date, time, depth, distance (downstream), elevation, treatment, date-time, category, and water type (lake, surface, soil). Physical measures collected in the field include temperature (water, soil, well water), conductivity, pH, average thaw depth, well height, discharge, stage height, and light (lakes). Chemical analysis for the sample include alkalinity; dissolved organic carbon (DOC); inorganic and total dissolved nutrients (NH4, PO4, NO3, TDN, TDP); particulate carbon, nitrogen, and phosphorus (PC, PN, and PP); cations (Ca, Mg, Na, K); anions (SO4 and Cl); silica and oxygen.

Project Keywords: 

Data set ID: 

10279

EML revision ID: 

11

Short name: 

1988-2010_Kling_Akchem
People

Keywords: 

Arctic LTER keywords: 

Dates

Date Range: 

Wednesday, June 29, 1988 to Saturday, August 21, 2010

Publication Date: 

Thursday, December 12, 2013

Methods: 

For water sampling protocols see the Arctic LTER Land-Water group protocol book accessible from the Land-Water mainpage on the Arctic LTER web page or at http://www-personal.umich.edu/~gwk and clicking on the protocol link at the bottom of the page. Specific methodologies are described in the protocol book listed above and a general description is provided below.

General analyses: In general water samples from soils, streams, and lakes are filtered in the field and kept cold and dark or preserved until analysis. Dissolved inorganic nutrients (NH4 and PO4) were analyzed by wet chemistry techniques at Toolik Field Station usually within 24 hours of sampling. Prior to 1999, the phenate method was used to analyze ammonium. In the years 1999-2001, a comparison study of the OPA method and the phenate method were performed. Starting in 2001, OPA was used to analyze ammonium content. Dissolved gases CO2 and CH4 were determined using a syringe equilibration method and analyzed at Toolik Field Station on a gas chromatograph. DOC, TDN, TDP, particulate C, N, and P, and dissolved ions were brought back to the University of Michigan for analysis. DOC is analyzed on a Shimadzu TOC-5000. Particulate Carbon and Nitrogen on a Perkin Elmer CHN 2400, TDN is analyzed on a Shimadzu TOC-5000 or using a persulfate digestion. TDP and NO3 are analyzed on an OI Alpkem autoanalyzer, ions on a Dionex ion chromatograph, and cations on an inductively coupled plasma optical emission spectrometer (ICP-OESPerkin Elmer Optima 4300 or 8000). Alkalinity samples were run on a Radiometer autotitrator either at Toolik Field Station or at the University of Michigan.

For all analyses, sample values that were less than zero were assigned a value of zero. See specific protocols for limits of detection. Missing values (not sampled or analyzed) are represented by a period " . " in the dataset.

Field and Lab Methods & Protocols

http://ecosystems.mbl.edu/arc/landwater/lw_protocols.html
http://ecosystems.mbl.edu/arc/landwater/lw_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

To cite this data set see the citation example on the LTER Network Data Portal page for this data set.

Variables Details

(Variables names are in the first line/row of the CSV file and Excel data sheet.)
SortChem
  • Label: SortChem
  • Definition: A unique number assigned to each sample collected at a specific site at a specific date and time. The year that the sample was collected is followed by a dash and then a sequential number. For example, if 600 samples were collected in 2002, then the first sample collected is 2002-0001 and the last sample is 2002-0600.
  • Type: Nominal
  • Missing values: None specified
Site
  • Label: Site
  • Definition: Site Name. If a soil site, the site is described in the name by general location then specific feature (e.g., watertrack) then specific sampling point (1,2,3,...). Lake and stream sites use common names (e.g., Toolik) or LTER number codes. Exceptions in naming procedure are provided in the Code Information and in the AK-LTER_Site_Info.xls file.
  • Type: Nominal
  • Missing values: None specified
Date
  • Label: Date
  • Definition: Sampling Date
  • Type: Date/time
  • Date format: dd-mmm-yyyy
  • Missing values:
    • . = Missing values
Time_hr_dst
  • Label: Time_hr_dst
  • Definition: Sampling Time in Alaska Daylight Savings Time (1 hour ahead of Alaska Standard Time: if 13:00 DST than 12:00 AST)
  • Type: Date/time
  • Date format: hh24:mi
  • Missing values:
    • . = Missing values
Depth_m
  • Label: Depth_m
  • Definition: Depth from surface of lake, stream, or soil, or a description of location such as "meta" for metalimnion.
  • Type: Nominal
  • Missing values: None specified
Distance_km
  • Label: Distance_km
  • Definition: Distance along a stream where negative values are upstream of a designated starting point and positive values are downstream of the designated starting point. For soil sites, the distance is the perpendicular distance from the river or lake shore. Can include a text description.
  • Type: Nominal
  • Missing values: None specified
Elevation_m
  • Label: Elevation_m
  • Definition: Elevation above sea level
  • Type: Physical quantity
  • Unit: meter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
Description_Treatment
  • Label: Description_Treatment
  • Definition: Additional information useful for describing a sample. Information would be entered in this column if the sample was part of an experiment, method test, or manipulation.
  • Type: Code list
  • Codes:
    • RE = Rain Event
    • FERT = Nutrient fertilization
    • BURN = Burned soil or vegetation
    • MIN = Addition of minerals
    • PHOTO = Photoexposed
    • BIO = bacterial incubation
    • TKI = Thermokarst impacted
    • ISCO = Automated water sampler
    • NAN = No treatment
  • Missing values:
    • . = Missing values
DateTime_DST
  • Label: DateTime_DST
  • Definition: Combined date and time of sampling. This is Alaska Daylight Savings Time (this is different than Alaska Standard Time; 1 hour ahead of Alaska Standard Time: if 13:00 DST than 12:00 AST)
  • Type: Date/time
  • Date format: dd-mmm-yyyy hh24:mi
  • Missing values:
    • . = Missing values
Catsort
  • Label: Catsort
  • Definition: Category name for identifying projects associated with the samples.
  • Type: Code list
  • Codes:
    • LTER-LW = LTER project Landwater group
    • LTER-Lakes = LTER project Lakes group
    • LTER-Streams = LTER project Streams group
    • LTREB = Long-Term Research in Environmental Biology project
    • AON = Arctic Observatory Network project
    • PHOTO = Photochemistry project
    • TK = Thermokarst project
    • BURN = Burn project
    • STUDENT = Student experiments or methods tests
    • ROOTS = Roots project
  • Missing values:
    • . = Missing values
water_type
  • Label: water_type
  • Definition: Water type sampled (soil, stream, lake, rain, etc.)
  • Type: Code list
  • Codes:
    • LA = lake water
    • GW = ground water
    • ST = stream water
    • HY = hyporheic water
    • PR = precipitation - rain
    • PS = precipitation - snow
    • CO = core (lake or soil)
    • DI = deionized water
    • ES = estuary
    • MA = marine
    • LE = leachate (leaves- soil- mud)
    • IS = isolate an extract of DOM compounds (e.g. using resins).
  • Missing values:
    • . = Missing values
Temp_C
  • Label: Temp_C
  • Definition: Sample water temperature, deg C
  • Type: Physical quantity
  • Unit: celsius
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
Cond_uS
  • Label: Cond_uS
  • Definition: Electrical conductivity of the water sample
  • Type: Physical quantity
  • Unit: microsiemenPerCentimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
pH
  • Label: pH
  • Definition: pH (opposite of the log of the molar hydrogen ion concentration)
  • Type: Physical quantity
  • Unit: number
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
Alk_ueqL
  • Label: Alk_ueqL
  • Definition: Total alkalinity (carbonate and non-carbonate alkalinity)
  • Type: Physical quantity
  • Unit: microequivalentPerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
PCO2_uatm
  • Label: PCO2_uatm
  • Definition: Partial pressure of carbon dioxide
  • Type: Physical quantity
  • Unit: microatmosphere
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
PCH4_uatm
  • Label: PCH4_uatm
  • Definition: Partial pressure of methane gas
  • Type: Physical quantity
  • Unit: microatmosphere
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
CO2_uM
  • Label: CO2_uM
  • Definition: Dissolved carbon dioxide gas concentration
  • Type: Physical quantity
  • Unit: micromolePerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
CH4_uM
  • Label: CH4_uM
  • Definition: Dissolved methane gas concentration
  • Type: Physical quantity
  • Unit: micromolePerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
DOC_uM
  • Label: DOC_uM
  • Definition: Dissolved organic carbon
  • Type: Physical quantity
  • Unit: micromolePerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
NH4_phen_uM
  • Label: NH4_phen_uM
  • Definition: Ammonium by the phenol method
  • Type: Physical quantity
  • Unit: micromolePerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
NH4_OPA_uM
  • Label: NH4_OPA_uM
  • Definition: Ammonium by the OPA method
  • Type: Physical quantity
  • Unit: micromolePerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
PO4_uM
  • Label: PO4_uM
  • Definition: Phosphate (Soluble Reactive Phosphorus)
  • Type: Physical quantity
  • Unit: micromolePerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
NO3_uM
  • Label: NO3_uM
  • Definition: Nitrate
  • Type: Physical quantity
  • Unit: micromolePerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
TDN_uM
  • Label: TDN_uM
  • Definition: Total dissolved nitrogen
  • Type: Physical quantity
  • Unit: micromolePerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
TDP_uM
  • Label: TDP_uM
  • Definition: Total dissolved phosphorus
  • Type: Physical quantity
  • Unit: micromolePerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
PC_ugL
  • Label: PC_ugL
  • Definition: Particulate carbon
  • Type: Physical quantity
  • Unit: microgramPerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
PN_ugL
  • Label: PN_ugL
  • Definition: Particulate nitrogen
  • Type: Physical quantity
  • Unit: microgramPerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
PP_uM
  • Label: PP_uM
  • Definition: Particulate phosphorus
  • Type: Physical quantity
  • Unit: micromolePerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
Ca_uM
  • Label: Ca_uM
  • Definition: Calcium
  • Type: Physical quantity
  • Unit: micromolePerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
Mg_uM
  • Label: Mg_uM
  • Definition: Magnesium
  • Type: Physical quantity
  • Unit: micromolePerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
Na_uM
  • Label: Na_uM
  • Definition: Sodium
  • Type: Physical quantity
  • Unit: micromolePerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
K_uM
  • Label: K_uM
  • Definition: Potassium
  • Type: Physical quantity
  • Unit: micromolePerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
Si_uM
  • Label: Si_uM
  • Definition: Silica
  • Type: Physical quantity
  • Unit: micromolePerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
SO4_uM
  • Label: SO4_uM
  • Definition: Sulfate
  • Type: Physical quantity
  • Unit: micromolePerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
Cl_uM
  • Label: Cl_uM
  • Definition: Chloride
  • Type: Physical quantity
  • Unit: micromolePerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
Oxygen_mgL
  • Label: Oxygen_mgL
  • Definition: Dissolved oxygen
  • Type: Physical quantity
  • Unit: milligramPerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
Chla_ugL
  • Label: Chla_ugL
  • Definition: Chlorophyll a (estimated by fluorometry) corrected for phaeopigment (phaeophytin). This acidification method was started in 1999, and applied to all samples in this spreadsheet (landwater) by 2000. Note that the Arcitc LTER Lakes group started this method in 2004.
  • Type: Physical quantity
  • Unit: microgramPerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
Phaeopigment_ugL
  • Label: Phaeopigment_ugL
  • Definition: Phaeopigment (measured by fluormetry) estimated by acidification of a chlorophyll sample.
  • Type: Physical quantity
  • Unit: microgramPerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
Chla_Raw_ugL
  • Label: Chla_Raw_ugL
  • Definition: Total Chlorophyll a (measured by fluorometry) without a phaeopigment correction (no acidification). This was this historical measure used by the Arctic LTER and previous studies of Toolik Lake. Chla_Raw = (((Sample Fluorescence - Blank) * Slope) - Intercept) * (Acetone_ml / Sample Volume Filtered)
  • Type: Physical quantity
  • Unit: microgramPerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
secchi_m
  • Label: secchi_m
  • Definition: Secchi depth in meters
  • Type: Physical quantity
  • Unit: meter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
Light_deck_uEm2s
  • Label: Light_deck_uEm2s
  • Definition: PAR (photosynthetically active radiation) measured above water surface (in air).
  • Type: Physical quantity
  • Unit: microEinsteinPerMeterSquaredPerSecond
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
Light_water_uEm2s
  • Label: Light_water_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 values
K_per_m
  • Label: K_per_m
  • Definition: Coefficient of light attenuation (extinction coefficient). This is estimated by regression of PAR light in water versus depth (meters). Units are in per meter (meter-1)
  • Type: Physical quantity
  • Unit: numberPerMeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
Thaw_depth_cm
  • Label: Thaw_depth_cm
  • Definition: Average active layer thaw depth using 3 independent measurements (Thaw 1, Thaw 2, and Thaw 3) all taken within ~50 cm from the sampling site. All measurements are made in inter-tussock areas with a steel probe.
  • Type: Physical quantity
  • Unit: centimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
5cm_Soil_tempC
  • Label: 5cm_Soil_tempC
  • Definition: Soil temperature at 5 cm depth from the soil surface, deg C
  • Type: Physical quantity
  • Unit: celsius
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
10cm_Soil_tempC
  • Label: 10cm_Soil_tempC
  • Definition: Soil temperature at 10 cm depth from the soil surface, deg C
  • Type: Physical quantity
  • Unit: celsius
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
Well_height_cm
  • Label: Well_height_cm
  • Definition: Height of soil water in lysimeter, piezometer, or well.
  • Type: Physical quantity
  • Unit: centimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
Well_tempC
  • Label: Well_tempC
  • Definition: Temperature of soil water in lysimeter, piezometer, or well, deg C
  • Type: Physical quantity
  • Unit: celsius
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
Discharge_Lsec
  • Label: Discharge_Lsec
  • Definition: Discharge in liters per second
  • Type: Physical quantity
  • Unit: literPerSecond
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values
Stage_cm
  • Label: Stage_cm
  • Definition: Stage Height of stream in centimenters
  • Type: Physical quantity
  • Unit: centimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing values