The SWOE Thermal Analysis and Measurement Program (STAMP) was conducted near Howland, Maine on land owned by the International Paper Company. The measurement program was held 6-24 September 1990 in conjunction with a NASA program on Forest Ecosystem Dynamics (FED).
STAMP was designed and organized by SPARTA, Inc. with logistical support generously provided by personnel from the University of Maine. Personnel from SPARTA, Inc. and the Keweenaw Research Center (KRC) of the Michigan Technical University participated in the field test efforts.
Measurements of the temperature distribution within a bigtooth aspen were obtained to support development of a 3-D thermal model of trees. Measurements were taken in and around the tree trunk. Measurements were also taken of temperatures from one living and one dead branch. The tree trunk measurements were made at three locations on the trunk at about 1, 5, and 8 feet above the ground.
At the one and five foot level, measurements were taken of the center and temperatures at different depths within the trunk. The in-depth temperatures were taken along lines corresponding to the compass directions. Four temperatures were taken at about one inch 1/4 inch from the bark outer surface. The latter depth was chosen to correspond to the approximate location of the inner surface of the bark. At the eight foot level, a probe was placed to measure the trunk center temperature.
The living branch was instrumented with four temperature probes. Two measured the branch center temperatures and two were placed under the bark at a depth of about 1/8 inch from the surface.
The dead branch was instrumented with two probes. One was placed to measure the branch center temperature and the second about 1/8 inch from the surface.
A series of probes were also placed to measure surface and soil temperatures around the tree. One was placed by the tree trunk and about three inches below the surface. Another probe was placed just below the surface in a clump of vegetation about six feet north of the tree. On 12 September 1990, the probes measuring the east and west trunk temperatures at the one inch in-depth locations were removed from the tree and relocated to measure the surface temperatures outside and inside the shadow zone of the tree.
Model 101 thermisters were used with two Campbell Scientific CR-21 data loggers to measure the trunk center and 1" depth temperatures. These data are contained in files CR21ALL1.DAT and CR21ALL2.DAT. Type K chromel-alumel thermocouples were used with a Campbell Scientific CR-21X data logger to measure the under bark temperatures on the trunk and branch temperatures. These data are contained in files CR21XPT1.DAT and CR21XPT2.DAT.
Between 7-12 September 1990, the tree temperature measurements were sampled every minute with fifteen minute averages, maximum, and minimum values collected and recorded. After 12 September 1990, only fifteen minute averages were collected. Also, the thermocouple measurements of the branch and under-the-bark trunk temperatures were discontinued because that equipment had to be returned to the lender.
File: CR21ALL1.DAT
Dates: 1330 LST, 7 Sept 90 - 1230 LST, 24 Sept 90
Julian Days 250 - 267
Equipment: Model 101 thermisters with Campbell Scientific CR-21
Datalogger
File: CR21ALL2.DAT
Dates: 1015 LST, 11 Sept 90 - 0900 LST, 21 Sept 90
Julian Days 254 - 264
Equipment: Model 101 thermisters with Campbell Scientific CR-21
Datalogger
File: CR21XPT1.DAT
Dates: 1330 LST, 8 Sept 90 - 1015 LST, 12 Sept 90
Julian Days 251 - 255
Equipment: Type K chromel-alumel thermocouples with Campbell Scientific
CR-21X Datalogger
File: CR21XPT2.DAT
Dates: 1330 LST, 8 Sept 90 - 1015 LST, 12 Sept 90
Julian Days 251 - 255
Equipment: Type K chromel-alumel thermocouples with Campbell Scientific
CR-21X Datalogger
Research funded by Air Force Geophysics Laboratory, Contract F19628-88-C-0038, Dr. Robert Beland, Technical Monitor