TITLE:	Ivotuk 1999 CALM-MAT Thawed Soil Depth Data

AUTHORS
	Howard E. Epstein
	Department of Environmental Sciences
	University of Virginia
	Charlottesville, VA 22904-4123
	(434) 924-4308 (phone)
	(434) 982-2137 (Fax)
	hee2b@virginia.edu

	Donald A. (Skip) Walker, University of Alaska 
Fairbanks

FUNDING SOURCE – NSF OPP-9908829

DATA SET OVERVIEW
	We used a soil probe to measure the depth of the 
active layer (depth to ice) of soil in the Moist Acidic 
Tundra (MAT) 100m X 100m grid at Ivotuk, AK.  Data were 
collected three times during the summer of 1999: June 5, 
June 26 and July 24.  Ivotuk, AK is located at 68.49 °N and 
155.74 °W at an elevation of approximately 490 m.

INSTRUMENTS
	We use an aluminum soil probe with a precision of 1 
cm.

DATA COLLECTION
	On June 5, June 26 and July 24, 1999, we sampled the 
depth to the active layer in the Moist Acidic Tundra (MAT) 
100m X 100m grid at Ivotuk, AK.  The MAT grid consists of 
121 sampling points (100m X 100m with 10m spacing).  At 
each point we took two measurements, one meter away from 
the grid point in two opposite cardinal directions (On June 
5, we took four measurement at each grid point, one for 
each cardinal direction).  The probe was pushed into the 
soil until it reached the frozen soil, and the depth was 
recorded to the nearest 1 cm.

DATA FORMAT
	Data are column delimited in either ASCII or Excel.  
The columns are DATE and REP (four for June 5, and two for 
June 26 and July 24).  There are also means calculated 
across replicates.  Rows are grid points numbered from 
A1..A11 through K1..K11 (121 points total).  Values are in 
centimeters.  Summary data include max, min, mean and 
standard deviation for each date.

COMMENTS:  See K. Hinkel CALM Home Page for more active 
layer monitoring data.