CANADA GLACIER ICE THERMISTORS
therm94 (updated March 21, 1997)
Data in this subdirectory comes from 10 thermistors set up on the Canada Glacier during the '94-'95 Antarctic field season. The thermistors are in two sets of five depths each: 5, 10, 20, 30, and 50 cm below the surface.
The raw data files (*.raw) give the following: ID#,JD,time,10 excitation voltages,10 temperatures,battery voltage
The 10 excitation voltages and 10 temperatures are set I, shallowest to deepest, set II, shallowest to deepest.
The *.dat files have been run through vtot.awk which converts the excitation voltages to temperatures using the Steinhart-Hart equation. As of 2.1.95, the conversion DOES take into account calibration offsets.
thm945.dat is summer 10 minute averages. Missing data is filled in with overrange values.
thm95.dat is winter 2 hour averages.
thm945.cln is thm945.dat averaged to 20 minute values using twentymin.pro
| thm95601.raw is thermistor data for the 1995-96 summer for the Canada Glacier thermistor arrays. The thermistors are in two sets and each set covers five depths - 5, 10, 20, 30, and 50 cm below the surface. |
| Probe# Position Offset (mV) |
| 42 Set1, 5cm 0.010821 |
| 43 Set1, 10cm 0.01375 |
| 44 Set1, 20cm 0.020804 |
| 45 Set1, 30cm 0.011309 |
| 46 Set1, 50cm 0.022165 |
| 47 Set2, 5cm 0.025894 |
| 48 Set2, 10cm 0.01902 |
| 49 Set2, 20cm 0.021398 |
| 50 Set2, 30cm 0.015788 |
| 51 Set2, 50cm 0.013753 |
| thm95601.raw |
| JD 326 1515 --> JD 360 1200 |
| (15 minute averages for the summer period. The record is stopped at noon on JD 360 when Paul and I unwired the thermistors and replaced them with a combined thermocouple/thermistor array.) |
| The raw data files (*.raw) give the following: |
| ID#,JD,time,10 excitation voltages,10 temperatures,battery voltage |
| The 10 excitation voltages and 10 temperatures are set I, shallowest to deepest, set II, shallowest to deepest. |
| thm95602.raw is output from a combined thermocouple/thermistor array installed on the Canada Glacier in late December 1995, during the 1995-96 field season to replace the thermistor arrays. There are two sets of thermistor/thermocouples. Thermistors are installed at depths of 0.5 and 1.0 meters. Thermocouples are installed between 1.0 and 0.25 meters and 1.0 and 0.1 meters. |
| Probe# Position |
| 42 Set 1, 1m |
| 43 Set 1, 0.5m |
| 47 Set 2, 1m |
| 48 Set 2, 0.5m |
| thm95602.raw |
| JD 360 1730 --> JD 25 1615 |
| (15 minute averages. Columns 4, 5, 8, and 9 are thermistor voltage output for 1m, .5m, 1m, and .5m respectively. Columns 6,7,10, and 11 are thermocouple output for the difference between 1-.25m, 1-.1m, 1-.25m, and 1-.1m respectively.) |
| The .dat files contain corrected temperature data. This is calculated using the vtot.awk and vtot2.awk scripts which convert the excitation voltages to temperatures using the Steinhart-Hart equation. As of 2.1.95, the conversion DOES take into account calibration offsets. |
| (Note: the mathematica program VOLTTEMP.MA will also do this conversion.) |
| The .cln files are .dat files that have been run through cleanthm.awk to produce input files for the IDL program ~kjl/progams/caa956/caa956.pro. In the cleaned files, nodata values have been put in for bad data or missing temperatures at some depth. Since the 01 and 02 files contain different depth data, the .cln files have been adjusted to show data at ALL depths: 0.05, 0.1, 0.2, 0.25, 0.3, 0.5, 1.0 meters. This means the .cln files both have 16 columns, but a subset of those columns contain nodata values for the entire file. |
| thm95602.cln has nodata values added to the beginning of the file to fill the time-gap between the two files. |
| (Note: thm95602.dat contains bad data for a number of thermistors at different times. These values are around -7003.38. They are replaces by 6999 by cleanthm.awk.) |
| thm956.cln is the concatenated files for the entire season and is used in the IDL program. |
| thm96.raw |
| JD 25, 1996 1800 --> JD 6, 1997 1000 |
| (in file, JD 0 200 --> JD 346 1600) |
| thm96.raw is output from a combined thermistor/thermocouple array installed on the Canada Glacier in late December 1995. There are two sets of thermistor/thermocouples. Thermistors are installed at depths of 0.5 and 1.0 meters. Thermocouples are installed between 1.0 and 0.25 meters and 1.0 and 0.1 meters. |
| The data is 120 minute averages. Columns 4, 5, 8, and 9 are thermistor voltage output for 1m, .5m, 1m, and .5m respectively. Columns 6,7,10, and 11 are thermocouple output for the difference between 1-.25m, 1-.1m, 1-.25m, and 1-.1m respectively.) |
| NOTE: tintin can not support logs and trig functions in awk. |
| thm967.raw |
| JD 6 1200 --> JD 16 1015 |
| (15 minute averages for the summer period.) |
| thm967.raw is output from the combined thermistor/thermocouple array on the Canada Glacier. There are two sets of thermistor/thermocouples. Thermistors are installed at depths of 0.5 and 1.0 meters. Thermocouples are installed between 1.0 and 0.25 meters and 1.0 and 0.1 meters. |
| The data is 15 minute averages. Columns 4, 5, 8, and 9 are thermistor voltage output for 1m, .5m, 1m, and .5m respectively. Columns 6,7,10, and 11 are thermocouple output for the difference between 1-.25m, 1-.1m, 1-.25m, and 1-.1m respectively.) |
| The .dat files contain corrected temperature data. This is calculated using the vtot2.awk script which converts the excitation < voltages to temperatures using the Steinhart-Hart equation. As of 2.1.95, the conversion DOES take into account calibration offsets. (Note: the mathematica program VOLTTEMP.MA will also do this conversion.) |
| Overwinter there was clearly trouble with the battery which caused overrange values for much of the early record. |
| Note: .raw files contain raw thermistor excitation voltages. .dat files have been converted using vtot.awk |
| thm97.dat |
| ID=105,JD,hour,1m therm,0.5m therm,0.25m Tc,0.1m Tc,1m therm,0.5m therm,0.25m Tc,0.1m Tc,voltage |
| JD 16 1100 -- 13 1200 |
| Note: hourly data |
| Probe# Position Calibration Offset |
| 42 Set 1, 1m 0.010821 |
| 43 Set 1, 0.5m 0.01375 |
| 47 Set 2, 1m 0.025894 |
| 48 Set 2, 0.5m 0.01902 |
| thm978.dat |
| ID=106,JD,time,1m therm,0.5m therm,0.25m Tc,garbage,1m therm,0.5m therm,0.25m Tc,garbage,new 1m therm,new 0.5m therm,voltage |
| JD 13 1215 -- 30 1030 |
| Probe# Position Calibration Offset |
| 42 Set 1, 1m 0.010821 |
| 43 Set 1, 0.5m 0.01375 |
| 47 Set 2, 1m 0.025894 |
| 48 Set 2, 0.5m 0.01902 |
| 50 Set 3 (new Jan 1998), 1m 0.015788 |
| 49 Set 3 (new Jan 1998), 0.5m 0.021398 |
| /programs |
| thm978.dld |
| thm978.doc |
| program to include new thermistors |
| January 13 1998 |
| Two new thermistors installed on Canada at St. 50 |
| Thermistor A -- #50 (Set II, 30 cm) installed at 0.99 m depth. |
| Thermistor B -- #49 (Set II, 20 cm) installed at 0.50 m depth. |
| Both thermistors, yellow tape at 1m. |
| Top thermocouples from both sets removed from datalogger. |
| thm98.dat - JD 30 1100 to 326 1700 (hourly data) |
| ID=102,JD,time,1m therm,0.5m therm,voltage |
| Probe# Position Calibration Offset |
| 50 Set 3 (new Jan 1998), 1m 0.015788 |
| 49 Set 3 (new Jan 1998), 0.5m 0.021398 |
| On JD 326 the datalogger running the thermistors was pulled from the glacier. No ice temperatures were recorded for the 1998-99 summer nor for the 1999 winter. |