Sediment primary productivity, respiration and productivity by irradiance curves from lakes near Toolik Field Station 2009 - 2010

Abstract: 

Dataset includes rates of benthic gross primary productivity (GPP) in mmol O2/m2/d by irrandiance (I) in uE/m2/s curves and benthic respiration rates in mmol/m2/d from lakes E-5, E-6, Toolik, Fog Lake 2, Horn, Perched and Luna during the summer of 2009-2010.

Project Keywords: 

Data set ID: 

10403

EML revision ID: 

5

Short name: 

2009_2010CRJ_sedimentPvsI

DOI: 

10.6073/pasta/79c8cff5e2edbe10ab42ab8164045c76
People

Keywords: 

Arctic LTER keywords: 

Dates

Date Range: 

Friday, June 26, 2009 to Sunday, August 2, 2009

Publication Date: 

Wednesday, December 12, 2012

Methods: 

We collected 10 cm diameter cores of lake sediments using a coring device deployed from a boat. Cores were immediately returned to Toolik Field Station where they were held in temperature controlled water baths at ambient lake water temperatures. The water overlying the sediment cores was exchanged with filtered (0.7 um pore size, precombusted GFF filters) epilimnetic water from each study lake. Following the exchange of the overlying water core tubes were sealed with a continuously logging oxygen probe inserted in each probe. Dissolved oxygen concentrations in the overlying water were recorded in 5 minute intervals. At the beginning of each experiment dissolved oxygen concentrations were recorded for approximately 4 hours while the cores were complete darkness, and rates of benthic respiration calculated from the rate of oxygen consumption. Following the initial dark treatment irradiance was increased at approximatley 2-hour intervals. Shade cloth was used to filter ~80%, ~60%, ~30% of irradiance and the final treatment was at full light capacity. Photon flux density (uE/m2/s) was recorded at each varying light interval.

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

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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 sampled
  • Type: Nominal
  • Missing values: None specified
Date
  • Label: Date
  • Definition: Date of sample
  • Type: Date/time
  • Date format: dd-mmm-yyyy
  • Missing values: None specified
Depth
  • Label: Depth
  • Definition: Depth of where sampled. Either a depth in meters or description of relative dept.
  • Type: Nominal
  • Missing values: None specified
Replicate
  • Label: Replicate
  • Definition: Replicate number
  • Type: Physical quantity
  • Unit: number
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
Irradiance
  • Label: Irradiance
  • Definition: Photon flux density (uE/m2/s)
  • Type: Physical quantity
  • Unit: micromolePerMeterSquaredPerSecond
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
GPP
  • Label: GPP
  • Definition: gross primary productivity (GPP) in mmol O2/m2/d
  • Type: Physical quantity
  • Unit: millimolePerMeterSquaredPerDay
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
Respiration
  • Label: Respiration
  • Definition: benthic respiration rates in mmol/m2/d
  • Type: Physical quantity
  • Unit: millimolePerMeterSquaredPerDay
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
Experimental Treatment
  • Label: Experimental Treatment
  • Definition: Treatment of cores if any.
  • Type: Nominal
  • Missing values: None specified