Tussock Watershed Thaw Depth Survey Summary for 1990 to present, Arctic LTER, Toolik Research Station, Alaska.

Abstract: 

Starting in 1990 thaw depth has been measured in a small watershed of tussock tundra every July 2nd and August 11th. The UTM stake grid (stakes are in a grid at every 100 meters) was used to locate the points . All measured depths are in cm. Measurements are made within a 20 cm radius of each location point. All the measurements are then averaged into a single value for the day.

Project Keywords: 

Data set ID: 

1019

EML revision ID: 

16

Short name: 

1990_present_TW_Thaw_Kling
People

Keywords: 

Arctic LTER keywords: 

Dates

Date Range: 

Monday, July 2, 1990 to Tuesday, August 11, 2009

Publication Date: 

Wednesday, December 12, 2007

Methods: 

Sampling Description:

Starting in 1990 thaw depth has been measured in a small watershed of tussock tundra every July 2nd and August 11th. The UTM stake grid (stakes are in a grid at every 100 meters) was used to locate the points. A ruled stainless steel rod was inserted in non tussock microhabitat until the frozen layer was reached, and the distance was measured to the top of the organic mat (beneath the uppermost moss). Two measurement were made at each point from 1990-1999, and three measurements were made at each point from 2000 on. All measured depths are in cm. Measurements are made within a 20 cm radius of each location point. All the measurements are then averaged into a single value for the day.

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

Sites sampled.

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

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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.)
Date
  • Label: Date
  • Definition: Day, Month, and Year that sample was taken
  • Type: Date/time
  • Date format: dd-mmm-yyyy
  • Missing values:
    • . = Missing or Not Measured
Calendar_Day
  • Label: Calendar_Day
  • Definition: Day of Year
  • Type: Physical quantity
  • Unit: nominalDay
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
Mean
  • Label: Mean
  • Definition: Average Thaw Depth for the Sampling
  • Type: Physical quantity
  • Unit: centimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
Standard_Devation
  • Label: Standard_Devation
  • Definition: Standard Deviation of Thaw Depth for the Sampling
  • Type: Physical quantity
  • Unit: centimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
Standard_Error
  • Label: Standard_Error
  • Definition: Standard Error of Thaw Depth for the Sampling
  • Type: Physical quantity
  • Unit: centimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
N
  • Label: N
  • Definition: Number of Measurements in the Sampling
  • Type: Physical quantity
  • Unit: centimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
Minimum
  • Label: Minimum
  • Definition: Minimum Thaw Depth for the Sampling
  • Type: Physical quantity
  • Unit: centimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
Maximum
  • Label: Maximum
  • Definition: Maximum Thaw Depth for the Sampling
  • Type: Physical quantity
  • Unit: centimeter
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured
%CV
  • Label: %CV
  • Definition: Coeffiecent of Variation
  • Type: Physical quantity
  • Unit: percent
  • Maximum: Not specified
  • Minimum: Not specified
  • Precision: Not specified
  • Missing values:
    • . = Missing or Not Measured