Close

Service Interruption

Soil Temperatures at South Royalton, Vermont, USA

Summary

This data set presents half-hourly measurements of soil temperatures at depths of 0 to 60 cm, together with meteorological data (air temperature, precipitation, pressure, relative humidity, wind speed/direction, solar radiation, longwave radiation) and snow depth. The data were collected in sandy loam soil at South Royalton, Vermont, between October 1989 and September 1993. The data document seasonal changes in soil temperature, including the development of a frozen layer and occasionally a transient thawed layer at the surface. Data are available via ftp.

Citing These Data:

Peck, L. and J. Fiori. 1992. Soil temperatures at South Royalton, Vermont, USA. Boulder, CO: National Snow and Ice Data Center. Digital Media.

Overview Table

Category Description
Data format Tab-delimited ASCII files
Spatial coverage South Royalton, Vermont, USA
Temporal coverage October 1989 - September 1993
File size 16 - 32 KB per ASCII file; total size 30.5 MB
Parameter(s) Soil temps at 7.5-cm increments from 0 to 60 cm,
on bare ground and beneath undisturbed snow cover.
Also meteorological data.
Procedures for obtaining data data are available via ftp

Table of Contents

1. Contacts
2. Detailed Data Description
3. Document Information

1. Contacts:

Investigator(s) Name and Title:

Lindamae Peck
US Army CRREL
72 Lyme Road
Hanover, NH 03755-1290
tel: 603-646-4261
fax: 603-646-4397
email: Lindamae.Peck@erdc.usace.army.mil

John Fiori
US Army CRREL
72 Lyme Road
Hanover, NH 03755-1290
tel: 603-646-4515
fax: 603-646-4397
e-mail: fiori@crrel.usace.army.mil

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:

File and Directory Structure:

The data are in directories by year (1989, 1990, 1991, 1992, 1993) and named "metMMDDYY.txt".

Format:

The data files are in tab-delimited ASCII. Each file represents one day (24 hours) of data, with measurements every half hour. The files are in the following format:

DATE	    TIME       Chnl 201	  Chnl 202   Chnl 203   Chnl 204  ....
10/23/89    00:30:00	6.7	   7.6	      8.3	 8.8 ....

The channels correspond to parameters as follows:

Channel   Parameter	

201 	Soil temperature (C) at 7.5 cm
202	Soil temperature (C) at 15 cm
203	Soil temperature (C) at 22.5 cm
204	Soil temperature (C) at 30 cm
205	Soil temperature (C) at 37.5 cm
206	Soil temperature (C) at 45 cm
207	Soil temperature (C) at 52.5 cm
208	Soil temperature (C) at 60 cm
301	Air temperature (C) at 5 cm
302	Air temperature (C) at 10 cm
303	Air temperature (C) at 15 cm
304	Air temperature (C) at 20 cm
305	Air temperature (C) at 25 cm
306	Air temperature (C) at 30 cm
307	Air temperature (C) at 35 cm
308	Air temperature (C) at 40 cm	
315	Soil temperature (C) at 0  cm
601	Forward scatter meter voltage (V)
701 	Average air temperature (C) at 2 m
702 	Maximum air temperature (C) at 2 m
703	Minimum air temperature (C) at 2 m
704	Average relative humidity (%) at 2 m
705	Maximum relative humidity (%) at 2 m
706	Minimum relative humidity (%) at 2 m
707	Average wind speed (m/s) at 2 m
708	Average wind direction (degrees) at 2 m
709	Instantaneous wind speed (m/s) at 2 m
710	Instantaneous wind direction (degrees) at 2 m
711	Maximum gust wind speed (m/s) at 2 m
712	Time of maximum gust at 2 m
713 	invalid
714	Precipitation (mm)	
715	Incident solar radiation, 0.3 - 3 microns, [avg]  (W/m2)
716	Reflected solar radiation, 0.3 - 3 microns [avg]  (W/m2)
801	Average air temperature (C) at 4 m
802	Maximum air temperature (C) at 4 m
803	Minimum air temperature (C) at 4 m
804	Average relative humidity (%) at 4 m
805	Maximum relative humidity (%) at 4 m
806	Minimum relative humidity (%) at 4 m
807	Average wind speed (m/s) at 4 m
808	Average wind direction (degrees) at 4 m
809	Instantaneous wind speed (m/s) at 4 m
810	Instantaneous wind direction (degrees) at 4 m
811	Maximum gust wind speed (m/s) at 4 m
812	Time of maximum gust at 4 m
813	invalid
814	Barometric pressure
815	Incident longwave radiation, 3 - 50 microns [avg]  (W/m2)
816	Upwelling longwave radiation, 3 - 50 microns [avg]  (W/m2)
CR10-T		Instantaneous snow depth (mm)
CR10-3		Average snow depth (mm)
CR10-4		Maximum snow depth (mm)
CR0206-06	Average snow depth (mm)
CR0206-07	Maximum snow depth (mm)

Channels 209-216, 314, 316, 602, and 603 are not site characterization channels; they are military sensor channels and can be ignored.

An entry of OVRNG indicates an out-of-range reading (high). An entry of OPEN means that a channel had been activated (the data logger was sampling that channel) but there was no instument feeding a voltage to the channel.

File Size:

The individual ASCII files range from 16 to 32 KB. Total file size is 30.5 MB.

Spatial Coverage:

Data were collected at South Royalton, Vermont, USA.

Northwest latitude: 43° 49' N
Northwest longitude: 72° 31' W
Southeast latitude: 43° 48.9' N
Southeast longitude: 72° 30.6' W

Temporal Coverage:

Data were collected between October 1989 and September 1993.

Parameter or Variable:

The data set consists of soil temperatures, snow depth, and meteorological parameters (air temperature, precipitation, pressure, relative humidity, wind speed/direction, solar radiation, longwave radiation). Sampling was generally 8 cycles/sec (every 125 msec), and every 10 minutes for snow depth, and the samples were averaged for half-hourly data points.

Error Sources:

Soil temperatures are valid only after 13:00 on 2 Oct 1989. The thermocouple probe for obtaining soil temperatures at the undisturbed location (channels 201 - 208) was put in place on 25 Sep 1989. During a site visit on 2 Oct, the researchers found that the thermocouple leads had been reversed when the thermocouple was connected to the data logger. The error was corrected. However, soil temperatures prior to midday on 2 October are invalid.

Channels 715 and 716 (incident and reflected solar radiation), sometimes display negative values. This is due to noise with the solar (0.3 - 3 microns) Eppleys at low levels of solar radiation. The negative values should be set to zero when working with the data.

There is a data anomaly at 11:00 on 23 October 1989. A technician installed an air thermocouple array (channels 301-308) on 18 Oct 1989, but there was a delay before those channels were sampled by the data logger. The researchers suspect that any nonsense numbers and additional overrange/open occurrences are the result of the technician working on the data logger. By the evening of 23 Oct 1989, the half-hourly reports stabilized in terms of number of channels and validity of their entries.

3. Document Information:

Document Creation Date:

March 26, 2003

Document URL:

http://nsidc.org/data/ggd489.html