Sedimentation rate, concentration of macronutrients and flux for NE14, Toolik, Dimple, Perched during Summer 2009.

Abstract: 

We measured the flux of bulk material and major macronutrients (carbon, nitrogen and phosphorus) from the water column to the benthos in four separate lakes during the summer of 2009. The lakes were chosen to investigate the impacts of disturbance on lake sedimentation. Two of the lakes, Dimple and Perched, were within catchments that were burned by the 2007 Anaktuvuk River wildfire. Two of the lakes, NE-14 and Perched, were receiving elevated sediment loads from thermokarst failures on their shorelines, and Toolik Lake was used as a reference lake. As such, the lakes were organized by disturbance regime: Dimple = fire only, Perched = fire + thermokarst, NE-14 = thermokarst only, and Toolik = undisturbed reference.

Project Keywords: 

Data set ID: 

10114

EML revision ID: 

5

Short name: 

2009BurnSedTrp

DOI: 

10.6073/pasta/e2db8161be27bdbdcd398b0290f63f39
People

Keywords: 

Arctic LTER keywords: 

Dates

Date Range: 

Sunday, June 7, 2009 to Tuesday, August 11, 2009

Publication Date: 

Monday, December 12, 2011

Methods: 

In each lake, NE-14, Toolik, Dimple and Perched, we deployed two clusters of three sediment traps at a depth of approximately 5 m. Each sediment trap cluster consisted of three 9 cm diameter tubes suspended vertically in the water column approximately 1 m from the bottom of the lake. A single float rope extending from the center of each sediment trap cluster to the surface of the lake marked the location of the trap. During the summer of 2009 sediment trap clusters were initially deployed in the lakes listed above from early to mid June. Sediment trap clusters were allowed to collect material precipitating out of the water column for durations of 2 to 3 weeks based on how frequently the individual lakes could be accessed with helicopter support.

Traps were sampled by carefully raising the trap cluster to the surface and pouring the contents of each sediment trap into a separate 4 L cubitainer. Once each trap was sampled the entire cluster was immediately redeployed at roughly the same location in approximately 5 m of water. Once collected, we returned the water to Toolik Field Station and forced aliquots through precombusted (500 degrees Celsius for 2 hours), 0.7 micrometer pore size, glass fiber filters for the analysis of percent organic matter, concentrations of particulate carbon, nitrogen and phosphorus, concentrations chlorophyll a and pheophytin, and stable isotopes carbon-13 and nitrogen-15. For analytical methods see ‘Protocols of the Arctic Lakes LTER' http://ecosystems.mbl.edu/ARC/lakes/protocols.html on the Arctic LTER webpage.

We calculated bulk sedimentation rate as well as carbon, nitrogen and phosphorus flux rate (mg m-2 d-1) by first measuring the mass of bulk particulate matter and macronutrients carbon, nitrogen and phosphorus in each trap (mg), and then dividing by the area of the trap (m2) and the duration that the trap was deployed (d).

Sites sampled.

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File 2009BurnSedTrp.csv

Sedimentation rate,... File Details

Office spreadsheet icon 2009BurnSedTrp.xls

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Variables Details

(Variables names are in the first line/row of the CSV file and Excel data sheet.)
Location
  • Label: Location
  • Definition: lake in which trap was deployed
  • Type: Nominal
  • Missing values: None specified
Cluster
  • Label: Cluster
  • Definition: trap cluster deployed in lake
  • Type: Nominal
  • Missing values: None specified
Trap
  • Label: Trap
  • Definition: individual trap within cluster
  • Type: Nominal
  • Missing values: None specified
Date Deployed
  • Label: Date Deployed
  • Definition: date in which trap was deployed
  • Type: Date/time
  • Date format: DD-MMM-YY
  • Missing values: None specified
Date Collected
  • Label: Date Collected
  • Definition: date in which trap was sampled
  • Type: Date/time
  • Date format: DD-MMM-YY
  • Missing values: None specified
Length of Deployment
  • Label: Length of Deployment
  • Definition: duration in which trap was deployed and collecting sediments
  • Type: Physical quantity
  • Unit: number
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
Sedimentation Rate
  • Label: Sedimentation Rate
  • Definition: rate at which bulk material sedimented out of the water column
  • Type: Physical quantity
  • Unit: milligramPerMeterSquaredPerDay
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
Percent organic matter
  • Label: Percent organic matter
  • Definition: percent of bulk sediment that was organic as determined by loss on ignition
  • Type: Physical quantity
  • Unit: percent
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
Particulate carbon
  • Label: Particulate carbon
  • Definition: concentration of particulate carbon in bulk sediment
  • Type: Physical quantity
  • Unit: microgramPerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
Particulate nitrogen
  • Label: Particulate nitrogen
  • Definition: concentration of particulate nitrogen in bulk sediment
  • Type: Physical quantity
  • Unit: microgramPerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
Particulate phosphorus
  • Label: Particulate phosphorus
  • Definition: concentration of particulate phosphorus in bulk sediment
  • Type: Physical quantity
  • Unit: micromolePerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
Chlorophyll a
  • Label: Chlorophyll a
  • Definition: concentration of chlorophyll a in bulk sediment
  • Type: Physical quantity
  • Unit: microgramPerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
Pheophytin
  • Label: Pheophytin
  • Definition: concentration of phaeophytin in bulk sediment
  • Type: Physical quantity
  • Unit: microgramPerLiter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
delta 13C
  • Label: delta 13C
  • Definition: del carbon-13 of bulk sediment
  • Type: Physical quantity
  • Unit: partPerThousand
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
delta 15N
  • Label: delta 15N
  • Definition: del nitrogen-15 of bulk sediment
  • Type: Physical quantity
  • Unit: partPerThousand
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
carbon flux
  • Label: carbon flux
  • Definition: flux of particulate carbon from water column to benthos
  • Type: Physical quantity
  • Unit: milligramPerMeterSquaredPerDay
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
nitrogen flux
  • Label: nitrogen flux
  • Definition: flux of particulate nitrogen from water column to benthos
  • Type: Physical quantity
  • Unit: milligramPerMeterSquaredPerDay
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
phosphorus flux
  • Label: phosphorus flux
  • Definition: flux of particulate phosphorus from water column to benthos
  • Type: Physical quantity
  • Unit: milligramPerMeterSquaredPerDay
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured