The soil samples taken on March 27 were weighed. Results are in entry #15.
Aliquots were in oven. These were matched with the soil samples for logbook#171 The aliquots were weighed and the results entered in Lobgook # 15 A soil sample was taken using a spade, placed in a plastic bag and at the base was separated into 0-2, 2-5 and 5-10 cm triple aliquots. These were weighed freshand put in oven for weighing on teardown. The data is in # 15
Soil Dry weights: (GDM, April 2: I believe these are actually wet weights of samples taken March 13, at tower rad stand): 0-2cm A1: 9.2 B1: 9.6 3-5cm A2: 24.6 B2: 31.6 5-8cm A3: 40.2 C2: 39.2 Note added on 27 Mar by TD On 26 Mar there were aliquots in the ovenI beleive that these correspond to a core taken at tower on 1 Mar Note added on April 2 by GDM: I believe the above note is wrong. Those weights correspond to a sheet found in the trailer, in Sandy's handwriting, for samples taken on March 13, 3:30 pm, which is documented in #168, 13 March, as a sample taken near tower rad stand.
Took soil core at tower and separated into 0-2,2-5 and 5-10. See logbook #15? for data (also my paper logbook)
At 9:15 visted Sage. Asp and vent fans OK. Brushed away ~8cm powder snow and took a soil core. Back in trailer subdivided into 0-2cm, 2-5cm, and 5-10cm. At 9:15 visited Bare. Asp fan OK. Brushed away ~5cm powder snow and took a csoil core. Back in trailer subdivided into 0-2cm, 2-5cm and 5-10cm. All the soil data reported in # 15
When taking the soil cores earlier in the day it was noted that the moisture
was mainly in the top few cm.
At 15:15 a 16 cm deep pit was made at the tower soil site. It was dug with a
shovel and squared off with a trowel. Samples of 0-2cm, 2-4cm, 4-8cm and 8-16cm
were extracted and loaded into tupperware containers. These were processed in
the trailer. The 0-2cm sample had substantial amount of grass, the next two
sample had a fair amount of root fiber, and the deepest sample was mostly dry
dirt.
Fresh Dry
0-2cm DI 5.8g 3.6g
DII 4.7g 2.8g
DIII 5.9g 3.6g
Fresh Dry
2-4cm EI 14.9g 11.9g
EII 17.3g 13.7g
EIII 19.0g 15.2g
Fresh Dry
4-8cm FI 19.2g 17.1g
FII 18.7g 16.7g
FIII 20.4g 18.3g
Fresh Dry
8-16cm GI 26.3g 24.9g
GII 23.0g 21.8g
GIII 29.0g 27.4g
The soil samples were taken and weighed on Wed, 20 Feb''02.
They were dried in the oven at 110C and weighed on Thu and again on Fri.
This was to check that drying was complete after a single day.
At 10:00 0-5cm soil core taken at sage. Several cm of fresh snow first removed.
Fresh Dry
AI 19.4g 16.5g
AII 20.4g 17.4g
AIII 23.4g 19.7g
At 10:30 0-5cm soil core taken at bare. Several cm of fresh snow first removed.
Fresh Dry
BI 19.6g 16.7g
BII 23.9g 20.1g
BIII 27.1g 22.7g
At 11:00 0-5cm soil core taken at tower A cm of fresh snow first removed.
Fresh Dry
CI 17.6g 13.2g
CII 17.0g 12.7g
CIII 16.6g 12.0g
The soil samples were taken on Wed, 20 Feb''02, and weighed
They were cooked in the oven at 110C and reweighed on Thu. To check the
completeness of drying they were left in the oven until Fri AM and reweighed.
The Thu and Fri weights were identical.
Soil samples taken at main tower about 16:30 today. Someone hadn't put the brass rings back in the case, so I didn't have them. Thus, I've processed this sample as one chunk, approx 3.75" thick. I made 3 alloquots from it: Wet: Dry: A1 36.3 33.3 A2 26.7 24.3 A3 28.8 25.4 Also, the total weight of the sample was 265.6, so a crude bulk density could be calculated. (We need a small metric ruler here!)
Two readings were taken approximately 5 minutes apart. 1 - 7.6 2 - 8.2
soil samples:
wet
tower sage
a1-14.3 b1-29.7
a2-16.3 b2-31.0
a3-16.3 b3-31.3
dry (weighed 2/18/02 by spo)
a1-15.9 b1-25.7
a2-17.4 b2-26.4
a3-18.0 b3-27.0
(how can the an samples be higher???)
These are the dry numbers. Could not find enter for the wet numbers A1 - 5.8 A2 - 7.1 A3 - 9.0 B1 - 16.0 B2 - 15.0 B3 - 15.8
About 11:40 I took another core at the main site. I also took a nearby TRIME
reading of 10.4%. This time, I cleared a bare spot, but there were still a lot
of roots (one ~4mm diam.) in the sample, so most of the sample felt like peat.
The was separated into layers. The top cm was only partly filled, since the
sample was on a small local slope. I estimate the average depth in this as
0.5cm. Also, the bottom wasn't completely filled either. I estimate the depth
as just 2cm.
I simply weighed the total dirt sample (wet) in each of 4 layers to get the
total bulk density, then created alloquots to determine the soil moisture
after drying. The corer diameter is about 5.4cm
Depth Cont. Tare Tare+Samp Samp Ave moist Comp.DryWeight DryDens
0-1.5 - 28.9 53.0 24.1
1.5-4.5 B 26.9 69.6 42.7
4.5-7.5 C 27.0 119.5 92.5
7.5-9.5 D 27.0 95.8 68.8
For the top 4.5 cm, bulk density is g/cm^3
Depth Alloquot Wet Dry Water
0-1.5 A1 13.3 2.9
A2 10.9 2.4
1.5-4.5 B1 27.0 12.2
B2 15.4 9.7
4.5-7.5 C1 47.9 43.1 (slightly spilled before dry weighing.)
C3 33.8 30.5
7.5-9.5 D1 33.8 31.7
A3 34.7 32.8
Since this sample was heavily influenced by the grass, I'll get another
tower sample today.
About 2:00 I took a core at the main site. I also took a nearby TRIME readings
of 5.7% and 6.9%.
I still had trouble unscrewing the corer when I got it back to the trailer, but
eventually got separated it out in layers. However, the top 2cm ended up being
above-ground grass, so the core was not as deep as it should have been. Also,
the first 3cm of ground, and even some of the next 3cm was mostly roots (like
peat).
I simply weighed the total dirt sample (wet) in each of 4 layers to get the
total bulk density, then created alloquots to determine the soil moisture
after drying. The corer diameter is about 5.4cm
Depth Cont. Tare Tare+Samp Samp Ave moist Comp.DryWeight DryDens
0-3 B 26.9 59.7 32.8 (peat) (39%) 23.6 0.34
3-6 C 27.0 116.1 89.1 (clumps) (11%) 80.3 1.17
6-8.7 D 27.0 129.1 102.1 (broken) (8%) 94.5 1.65
For the top 6 cm, bulk density is 0.76 g/cm^3
Depth Alloquot Wet Dry Water
0-3 B1 11.8 8.1 3.7 (31.4%)
B2 12.3 6.6 5.7 (46.3%)
3-6 C1 32.9 29.4 3.5 (10.6%)
C3 32.0 28.1 3.9 (12.2%)
6-8+ D1 40.8 37.7 3.1 (7.6%)
A3 36.1 33.3 2.8 (7.8%) spilled during second weighing, but
I think I recovered most of it)
Since this sample was heavily influenced by the grass, I'll get another
tower sample today.
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Graphic: 
This page summarizes the TRIME readings: main bare time reading time reading Dec 4 1015 7.1% 1615 4.7% Dec 5 1230 7.5% 1310 11.4% Dec 6 1330 8.8% 1030 12.3% Dec 7 1400 6.3% 1700 6.9% Dec 8 1140 10.4% 1600 7.3% Dec 9 1245 8.0% 1630 9.1% Dec 10 1230 5.6% 1500 9.4,9.7,9.9% I've plotted these values with the 615 readings. Obviously, the comparison is pretty bad -- probably this is a spatial sampling issue.
- 62: Soil, Site stn2, Thu 06-Dec-2001 12:34:56 MST, soil samples
About 10:30 I took a core at the bare site. I also took a nearby TRIME reading of 12.3%. I had trouble unscrewing the corer when I got it back to the trailer, so I simply ground dirt out, making the profile sampling a bit crude. I simply weighed the total dirt sample (wet) in each of 4 layers to get the total bulk density, then created alloquots to determine the soil moisture after drying. The corer diameter is about 5.4cm Depth Cont. Tare Tare+Samp Samp Ave moist Comp.DryWeight DryDens 0-2 - 28.9 78.1 49.2 (damp) 12.7% 43.7 0.95 2-5 B 26.9 139.9 113.0 (wet) 12.3% 100.6 1.46 5-8 C 27.0 125.7 98.7 (wet) 8.1% 91.3 1.33 8-10.7 D 27.0 108.4 81.4 (dry) 8.6% 75.0 1.21 For the top 5 cm, bulk density is 1.26 g/cm^3 Depth Alloquot Wet Dry Water 0-2 A1 18.8 16.5 2.3 (12.2%) A2 19.6 17.4 2.2 (11.2%) 2-5 B1 23.8 20.8 3.0 (12.6%) B2 24.7 21.7 3.0 (12.1%) 5-8 C1 34.8 31.7 3.1 (8.9%) C3 36.4 33.7 2.7 (7.4%)(I added one of the 2 rocks) 8-10+ D1 30.9 28.0 2.9 (9.4%) A3 30.6 28.2 2.4 (7.8%) Tomorrow, I'll go for a sample at the tower.- 61: Soil, Site tower, Thu 06-Dec-2001 12:27:02 MST, soil sampling
Procedure for soil samples during FLOSS01 At both sites, somewhere in the vicinity of the radiation stand/soil sensors, take periodic soil cores for Bulk Density and for Soil Moisture. Bulk density need only be done a few times at each site, but it would be good to do soil moisture periodically. I tried out the soil corer during set-up and found it to be a suitable method for both Bulk Density and Soil Moisture After using the corer clean it and wipe the threed with a WD40 tissue. Note that the barrel need not be screwed in too tightly Assemble the core with two 1cm sleeves then one 3cm sleeve and then the remaining sleeves. This will enable the top 5 cm to be separated from the core. At the sample location, clean away the snow and loose dead grass. Using the slide hammer pound the core into the soil until it bottoms out. Work the corer back and foreward, left and right until it is loose. Lift the corer out and carry it back to the base. Use the plastic box in the tool box as a work area. Unscrew the barrel of the corer and push out the sleeves containing the soil core. Using the flat bladed tool separate the core at the 5 cm level. To determine bulk density (and soil moisture): Place entire 5cm core in one of the larger Al containers. Weigh, setting the tare with a similar Al container. Cook for two days in the oven at 110 C. Reweigh. From volume of the core (5cm x pi r^2 cm^2) and dry weight calculate bulk density. From fresh weight and dry weight calculate the gravimetric water fraction. (fresh wt - dry wt)/dry wt = gravimetric water fraction. To determine soil moisture only (but more accurately). After separating the top 5 cm of the soil core break up the soil mass and homogenize it. In three of the small Al containers (labelled A1,A2,A3, B1,B2,B3, C1,C2,C3) load ~ 30g of soil. Weigh, using a similar container as tare. Cook for one day in the oven set at 110 C. Reweigh. From fresh weight and dry weight calculate the gravimetric water fraction. (fresh wt - dry wt)/dry wt = gravimetric water fraction.- 52: Soil, Site stn2, Wed 05-Dec-2001 13:13:29 MST, soil Q
Sampled one location: 11.4% also shot 3 photos. Also changed wind gen pot to full counterclockwise. P.S. There was no charging the following night even with 10 m/s winds, so this pot adjustment was bad.
- 43: Soil, Site all stns, Tue 04-Dec-2001 14:39:08 MST, soil moisture
I made some hand-held TRIME measurements near the soil probes at the main tower today. At two sites I got: 7.3% and 6.9%. Note that the first readings were both 6.9%. The first site showed increasing values over the first minute. These were done about 10:15 this morning. Later in the day, (4:15), took readings at bare site: 4.2%, 4.7%, and 5.0%. I think that the 4.7 was about like the 615 probe.