Dissolved organic carbon (DOC) measurements from Toolik Lake Inlet and Toolik Lake main, Toolik Field Sation, North Slope Alaska for 2005-2008.


Dissolved organic carbon (DOC) measurements from Toolik Lake Inlet and Toolik Lake main sampling station for 2005-2008. The earliest measurements were in May and with the latest in September.

Project Keywords: 

Data set ID: 


EML revision ID: 


Short name: 






Date Range: 

Monday, May 9, 2005 to Friday, August 15, 2008

Publication Date: 

Monday, December 12, 2016


For detailed water sampling protocols see the Arctic LTER Land-Water group protocol book accessible from the Land-Water main page 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. A brief method is provided below.

In general water samples from soils, streams, and lakes are filtered in the field and kept cold and dark or preserved until analysis. Water samples for DOC are collected in acid-washed opaque polyethylene bottles, kept dark and cool until they are filtered through Whatman GF/F filters (nominal pore size 0.6 microns), then acidified to pH<4 with trace-metal grade 6N HCl (~ 1 microliter of acid per 1 milliliter of sample). Samples are then stored in the dark at ~4 deg C until analysis at the University of Michigan on a Shimadzu TOC-5000 with a high-temperature, platinum-catalyzed combustion to CO2 and infrared detection.

Missing values (not sampled or analyzed) are represented by a period " . " in the dataset.
Field and Lab Methods & Protocols


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.)
  • 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
  • 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
  • Label: Date
  • Definition: Sampling Date
  • Type: Date/time
  • Date format: dd-mmm-yyyy
  • Missing values:
    • . = Missing values
  • 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:mm
  • Missing values:
    • . = Missing values
  • 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
  • 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