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Annual Thaw Depths in Illisarvik, Northwest Territories

Summary

Thaw-depth data were collected annually in August from 21 August 1979 to 18 August 1999, from 400-m, 600-m, and tundra transects at Illisarvik lake, Richards Island, Northwest Territories, Canada. Coordinates are 69° 30' N, 134° 32' W. Data are in tab-delimited ASCII text format, and are available via FTP.

Citing These Data:

Burn, C. 2003. Annual Thaw Depths in Illisarvik, Northwest Territories. Boulder, CO: National Snow and Ice Data Center. Digital Media.

Overview Table

Category Description
Data format

Data are in tab-delimited ASCII text format.

Spatial coverage

Data were collected from Illisarvik transects, Richards Island, Northwest Territories, Canada. Coordinates are 69° 30' N, 134° 32' W.

Temporal coverage

Data were collected once annually each August from 21 August 1979 to 18 August 1999.

File naming convention

ggd642_thawdepth_400m.txt: Thaw depths (cm) along 400-m transect
ggd642_thawdepth_600m.txt: Thaw depths (cm) along 600-m transect
ggd642_thawdepth_tundra.txt: Thaw depths (cm) along tundra transect

File size

ggd642_thawdepth_400m.txt: 2 KB
ggd642_thawdepth_600m.txt: 2 KB
ggd642_thawdepth_tundra.txt: 1 KB

Parameter(s)

Thaw depth (cm)

Procedures for obtaining data

Data are available via FTP.

Table of Contents

1. Contacts and Acknowledgments
2. Detailed Data Description
3. References and Related Publications
4. Document Information

1. Contacts and Acknowledgments:

Investigator(s) Name and Title:

Dr. Chris Burn
Department of Geography
Carleton University
1125 Colonel by Drive
Ottawa, Ontario
K2S 5B6  Canada

Technical Contact:

NSIDC User Services
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
Boulder, CO 80309-0449  USA
phone: +1 303.492.6199
fax: +1 303.492.2468
form: Contact NSIDC User Services
e-mail: nsidc@nsidc.org

2. Detailed Data Description:

Format:

Data are in tab-delimited ASCII text format, listed by date (row) and sampling location (column). Column headers indicate benchmark numbers at 25-m intervals along the bottom of the lake in the following directions:

Geographic coordinates of sites are not available. Empty fields indicate missing data.

Following is the first record of data from "ggd642_thawdepth_400m.txt":

Date (mm/dd/yy)	Year	#66	#67	#68	#69	#70	#71	#72	#73	#74	#75	#76	#77	#78	#79	#80	#81	#82	#83
08/21/79	1	39	43	67	79	83	49	46	52	60	50	60	98	74	102	146	158	169	60
	

Following is the first record of data from "ggd642_thawdepth_tundra.txt":

Date (mm/dd/yy)	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	#11	#12	#13	#14	#15
8/18/83		63	33	35	51	43	41	39	41	46	39	30	50	47	50	34
	

File Naming Convention:

ggd642_thawdepth_400m.txt: Thaw depths (cm) along 400-m transect
ggd642_thawdepth_600m.txt: Thaw depths (cm) along 600-m transect
ggd642_thawdepth_tundra.txt: Thaw depths (cm) along tundra transect

File Size:

ggd642_thawdepth_400m.txt: 2 KB
ggd642_thawdepth_600m.txt: 2 KB
ggd642_thawdepth_tundra.txt: 1 KB

Spatial Coverage:

Data were collected from Illisarvik, 69° 30' N, 134° 32' W. Illisarvik is a small, drained tundra lake on Richards Island, 130 km north of Inuvik, Northwest Territories, Canada, at the Beaufort Sea coast. Illisarvik is northern Canada's longest-running field experiment. The lake was drained on 13 August 1978, and field studies have been conducted there continuously since. Illisarvik is 600 m long by 300 m wide. Before drainage it was up to 5 m deep, but most of the lake was between 2 m to 3 m deep. Lake-ice thickness on Richards Island is less than 2 m, so most of the lake bottom was unfrozen throughout the year. In the middle of the lake, unfrozen ground extended to 32 m depth. Permafrost started to develop in lake sediments in winter 1978-79, following drainage (Burns 2003).

Temporal Coverage:

Data were collected once annually each August from 21 August 1979 to 18 August 1999.

3. References:

Burn, C. 2003. "About Illisarvik." The Illisarvik Bibliography. http://www.nwtresearch.com/illisarvik/about.asp. Accessed 12 May 2003.

Mackay, J., and C. Burns. 2002. The first 20 years (1978/79 to 1998/99) of ice-wedge growth at the Illisarvik experimental drained lake site, western Arctic coast, Canada. Canadian Journal of Earth Sciences 39: 95-111.

Mackay, J.R. 1982. Active layer growth, Illisarvik experimental drained lake site, Richards Island, Northwest Territories. In Current Research, Part A, Geological Survey of Canada, Paper 82-1A, pp. 123-126.

4. Document Information:

Document Creation Date:

May 2003

Document Revision Date:

May 2003

Document URL:

http://nsidc.org/data/docs/fgdc/ggd642_thawdepth_canada/index.html