snowfence

Lake Bonney Snowfence Meteorological Station Daily Averages

Abstract: 

As part of the Long Term Ecological Research in the McMurdo Dry Valleys of Antarctica, meteorological data was collected from various locations throughout Taylor, Wright and Victoria Valleys. These files contain data for the Lake Bonney Snowfence station (in Taylor Valley). Measurements at this temporary met station ceased on April 2006.

Here we offer the daily averages based on the 15-min frequency data for the Lake Bonney Snowfence station.

Data set ID: 

7104

Additional Project roles: 

78
79
215

Short name: 

Boys Dailies

Methods: 

During the 2000-2001 field season, the McMurdo LTER established a snowfence above (south) of the west lobe of Lake Bonney in western Taylor Valley. The station was set up to sample sensors every 30 seconds, except the sonic range which samples every 15 minutes, and send summary statistics (for example, averages and maximums) to solid-state storage modules every 15 minutes. This has resulted in approximately 20 values being recorded for final storage in every output interval.
Task List notes
 
2002-2003 Season
 
Author of this report: Thomas Nylen 
Sampling Frequency: sonic every 60 minutes, every 30 sec for all the others 
Averaging and Output Interval: every 15 min 
Program Name: bsn001v1.dld
 
Filename bsn02031.dat
File Period: January 24, 2002 (24) @ 1500 to Nov 7, 2002 (311) @ 0430 
 
Filename bsn02032.dat
File Period: Nov 7, 2002 (311) @ 0445 to Nov 16, 2002 (320) @ 1445 
 
Filename bsn02033.dat
File Period: Nov 16, 2002 (320) @ 1445 to Dec 17, 2002 (351) @ 1830 
 
Filename bsn02034.dat
File Period: Dec 17, 2002 (351) @ 1845
 
Filename bsn02035.dat
File Period: Dec 17, 2002 (351) @ 1845 to January 24, 2003 (24) @ 1400
 
1. array I.D. o1 
2. day ok 
3. time ok 
4. mean soil P.A.R. +3.6 m (east) from snow fence (micromols/s/m2) – Q30801 divide by 200, multiply by 301.57 
5. mean soil P.A.R. +1.8 m (east) from snow fence (micromols/s/m2) – Q30802 divide by 200, multiply by 319.62 
6. mean Air P.A.R. @ 1.6 m (micromols/s/m2) – Q20266 divide by 200, multiply by 228.05
7. mean air temp. @ 1.5 m (C) rclow 
8. mean soil temperature @ 0 cm in soil -1.9 m (west) of snow fence (C) rclow 
9. mean soil temperature @ 0 cm in soil +0.9 m (east) of snow fence (C) rclow 
10. mean soil temperature @ 0 cm in soil +1.8 m (east) of snow fence (C) rclow 
11. mean soil temperature @ 0 cm in soil +3.6 m (east) of snow fence (C) rclow 
12. sample depth from sensor to surface (cm) Measured depth (1.097) + Value) * 100 
13. sample of battery voltage
 
For FILENAMES  bsn0234 and bsn02035 the PAR multipliers differ:
 
4. mean soil P.A.R. +3.6 m (east) from snow fence (micromols/s/m2) divide by 200, multiply by 217.27 
5. mean soil P.A.R. +1.8 m (east) from snow fence (micromols/s/m2) divide by 200, multiply by 222.23 
6. mean Air P.A.R. @ 1.6 m (micromols/s/m2) divide by 200, multiply by 275.02
 
2003-2004 Season
 
Author of this report: Thomas Nylen 
Sampling Frequency: sonic every 60 minutes, every 30 sec for all the others 
Averaging and Output Interval: every 15 min 
Program Name: bsn023v1v1.dld (Program Signature: 63043)
 
Filename bsn03041.dat
File Period: January 24, 2003 (24) @ 1415 to November 7, 2003 (311) @ 0345 
 
Filename bsn03042.dat
File Period: November 7, 2003 (311) @ 0400 to November 19, 2003 (323) @ 1115
 
Filename bsn03043.dat
File Period: November 19, 2003 (323) @ 1130 to January 5, 2004 (5) @ 1700
 
Filename bsn03044.dat
File Period: January 5, 2004 (5) @ 1715 to January 24, 2004 (24) @ 1130
 
Filename bsn03045.dat
File Period: January 24, 2004 (24) @ 1200
 
1. array I.D. o1 
2. day ok 
3. time ok 
4. mean soil P.A.R. +3.6 m (east) from snow fence (micromols/s/m2) divide by 200, multiply by 217.27 
5. mean soil P.A.R. +1.8 m (east) from snow fence (micromols/s/m2) divide by 200, multiply by 222.23 
6. mean Air P.A.R. @ 1.6 m (micromols/s/m2) divide by 200, multiply by 275.02
7. mean air temp. @ 1.5 m (C) rclow 
8. mean soil temperature @ 0 cm in soil -1.9 m (west) of snow fence (C) rclow 
9. mean soil temperature @ 0 cm in soil +0.9 m (east) of snow fence (C) rclow 
10. mean soil temperature @ 0 cm in soil +1.8 m (east) of snow fence (C) rclow 
11. mean soil temperature @ 0 cm in soil +3.6 m (east) of snow fence (C) rclow 
12. sample depth from sensor to surface (cm) Measured depth (1.097) + Value) * 100 
13. sample of battery voltage
 
2004-2005 Season
 
Author of this report: Thomas Nylen 
Sampling Frequency: sonic every 60 minutes, every 30 sec for all the others Averaging and Output Interval: every 15 min 
Program Name: bsn023v1v1.dld (Program Signature: 63043)
 
Filename: bsn04051.dat 
File Period: January 24, 2004 (24) @ 1200 to November 15, 2004 (320) @ 1430 
 
Filename: bsn04052.dat
File Period: November 15, 2004 (320) @ 1445 
 
Filename: bsn04053.dat
File Period: November 15, 2004 (320) @ 1445 to January 24, 2005 (24) @ 1515
 
1. array I.D. o1 
2. day ok 
3. time ok 
4. mean soil P.A.R. +3.6 m (east) from snow fence (micromols/s/m2) – Q30801 divide by 200, multiply by 217.27 
5. mean soil P.A.R. +1.8 m (east) from snow fence (micromols/s/m2) – Q30802 divide by 200, multiply by 222.23 
6. mean Air P.A.R. @ 1.6 m (micromols/s/m2) – Q20266 divide by 200, multiply by 275.02 
7. mean air temp. @ 1.5 m (C) rclow 
8. mean soil temperature @ 0 cm in soil -1.9 m (west) of snow fence (C) rclow 
9. mean soil temperature @ 0 cm in soil +0.9 m (east) of snow fence (C) rclow 
10. mean soil temperature @ 0 cm in soil +1.8 m (east) of snow fence (C) rclow 
11. mean soil temperature @ 0 cm in soil +3.6 m (east) of snow fence (C) rclow 
12. sample depth from sensor to surface (cm) Measured depth (1.097) + Value) * 100 
13. sample of battery voltage
 
2005-2006 Season
 
Date of Establishment: January 2001 by Thomas Nylen 
Author of this report: Thomas Nylen 
Sampling Frequency: sonic every 60 minutes, every 30 sec for all the others 
Averaging and Output Interval: every 15 min 
Program Name: bsn045v1.dld (Program Signature: 1133)
 
Filename bsn04051 (Note filename does not follow convention)
File Period: January 24, 2005 (24) @ 1515 to November 14, 2005 @ 1615
 
Filename bsn04052 (Filename does not follow convention)
File Period: November 14, 2005 (24) @ 1630 to January 4, 2006 @ 1400

Data sources: 

BOYS_AIRPAR_DAILY
BOYS_AIRT_DAILY
BOYS_SURFCHANGE_DAILY
BOYS_SOILT_DAILY
BOYS_SOILPAR_DAILY

Quality Assurance: 

Season 2002-2003
 
bsn02031 notes:
1. Sonic Sensor not working. 
2. Missing data between June 3, 2002 @ 1015 and June 3, 2002 @ 1945 
3. Missing data between October 17, 2002 @ 600 and October 17, 2002 @ 1530
 
bsn02032 notes:
1. Sonic sensor not working
 
bsn02033.dat Notes:
 
1. Sonic Sensor not working, everything else appears to be working fine. 
2. Replace PAR Sensors between 12/17/02 @ 1815 and 12/17/02 @ 18:45. 
 Air PAR – Old: Q28259 and New: Q20266 
 Soil PAR +3.6m – Old: Q23210 and New Q30801 
 Soil PAR +1.8m – Old: Q23207 and New Q30802 
3. Repositioned soil temperature probes next to PAR sensors 
4. Loaded new program, BS023v1.dld on 12/17/02 @
 
bes02034.dat Notes: (same as bsn02033)
 
 PLUS - Only one line of data
 
bsn02035.dat notes:
 
1. Loaded new program, BS023v1.dld on January 24, 2003 @ 1415. Same name as old. Just changed on line of the program to use the multiplier to calculate the sonic depth. 
2. Duplicate line at beginning of file with previous data file. Use line of data from previous file. 
3. First value for depth sensor is bad, flag 
4. Tired tighten down the middle vertical post, which contains all the sensors, but it is frozen in and cannot straighten completely. Did managed to get it close, so the depth will change. Old sonic depth is 110.4, new is 112.1.
 
Season 2003-2004
 
bsn03041 Notes:
 
1. Missing depth measurements between January 24, 2003 (24) @ 1415 and January 24, 2003 (24) @ 1445 
2. Missing data between March 31, 2003 (90) @ 1645 and April 1, 2003 (91) @ 0125
 
bsn03042 Notes:
 
1. Sonic sensor repositioned. Need additional to cables to secure center posts. 
2. CR10X time adjusted back 7 minutes and 13 seconds on November 19, 2003 @ 1115
 
bsn03043 Notes:
1. Sonic sensor repositioned. Need additional to cables to secure center posts. 
2. CR10X time adjusted +6 seconds on January 5, 2004 @ 1651 
3. Sonic ranger height changed because new guide wires were installed. Old height was 1.08 cm, and the new height is 1.098 cm from the surface.
 
bsn030404 Notes:
 
1. Missing line of data between this file and the next |
2. Sonic sensor repositioned on January 24, 2004 @ 1200 and secured with more cables. 
3. CR10X time adjusted +2 seconds on January 24, 2003 (24) @ 1141 
4. Removed 2 of the 4 batteries. Had to power down the station for ten minutes. Missed 15 minutes data. 
5. Sonic sensor height, 111.0 cm
 
bsn03045 Notes:
1. Sonic sensor repositioned on January 24, 2004 @ 1200 and secured with more cables. 
2. CR10X time adjusted +2 seconds on January 24, 2003 (24) @ 1141 
3. Removed 2 of the 4 batteries. Had to power down the station for ten minutes. 
4. Sonic sensor height, 111.0 cm
Season 2004-2005
 
bsn04051.dat Notes: 
1. No data missing
2. CR10X time adjusted back 9 minutes and 17 seconds on November 15, 2004 (320) @ 1430 
 
3. Checked input values on November 15, 2004 (320) @ 1430 
4. Loaded new program, Bsn045v1 on November 15, 2004 (320) @ 1445. 
5. Sonic sensor height, 111.9 cm. 
6. Swapped Soil Quantum @ 1m from fence (Q30802) with recalibrated probe (Q23210) at November 15, 2004 (320) @ 1411. Swapped Soil Quantum @ 2m from fence (Q30801) with recalibrated probe (Q20526(8?)) at November 15, 2004 (320) @ 1416. Swapped Air Quantum (Q20268) with recalibrated probe (Q29775) at November 15, 2004 (320) @ 1425. 
7. Swapped out one SM4M for another on December 1, 2004 (336) @ 1432. 
8. Swapped out old datalogger for recalibrated datalogger at November 15, 2004 (320) @ 1445. Powered down the datalogger to replace it, and load the new program from the storage module. A if statement was added to the program which does not turn on the sonic ranger if the voltage drops below 11.5V. 
9. Fence was damaged during the storm on August 25. The sonic was leaning over when visited in November.
 
bsn04052.dat Notes:
 
1) No data missing
 
bsn04053.dat Notes:
 
1. No data missing 
2. First line a repeat of the one line of data for bsn04052.dat. Ignore first line of this file (bsn04053.dat). 
3. CR10X time adjusted ahead 1 minutes and 23 seconds on January 24, 2005 (24) @ 1515 
4. Checked input values on January 24, 2005 (24) @ 1515 
5. Sonic sensor height, 109.4 cm. 
6. Swapped out one SM4M for another on January 24, 2005 (24) @ 1523.
 
Season 2005-2006
 
bsn04051 (NOTE the deviation from convention)
1. Winter damage to snow fence. The fence was loose which caused the +1.8m soil PAR sensor, - 1m and -1m soil temperature probes to be pulled out. Data needs to be flagged. The fence also pulled out nails. Everything was placed back into original order and fence reconnected. Need to repair fence in later visit. 
2. No data missing 
3. CR10X time adjusted back 4 minutes and 42 seconds on November 14, 2005 @ 1606 
4. Input values not checked. 
5. Sonic sensor height, 160.6 cm. 
6. Swapped out one SM4M for another on November 14, 2005 @ 1616
bsn04052 (NOTE the deviation in filename from convention)
 
1. No data missing 
2. CR10X time adjusted back 34 seconds on January 4, 2006 @ 1355 
3. Checked input values January 4, 2006 @ 1357. Look good. 
4. No snow at site. 
5. Sonic sensor height, 109.6 cm.
6. South end of snow fence still in need of repair. Made temporary fix. 
7. Swapped out one SM4M for another on January 4, 2006 @ 1400.
 

Additional information: 

Meteorological data is collected year-round at each of the stations in the McMurdo Dry Valleys of Antarctica. 
 
After retrieving this data (usually every January), the parameters that are recorded are processed from level 0 (raw) to level 1 (processed, provided on the web). The  raw data file descriptions and task lists summarize what was done to get from  level 0 to level 1 for all station found at the following address:
 
 
The last usable data was recorded on January 4, 2006 @ 14:00. There was some intermittent data recorded during the 2006-2007 season, but not much. The station was modified in late January 2007 to support another experiment
 

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