Have started looking at the comparison between the various rain gauges. In this analysis, I removed [data when the wetness sensor indicated dry conditions?] There have been several major rain events, but not all sensors were working:
Date |
understory |
ott.pond |
tb.pond |
wxt.pond |
wetness.pond |
|---|---|---|---|---|---|
6/1 |
ok |
ok |
wire stretched |
misconfigured |
ok |
6/5-6/6 |
plugged |
ok |
wire streched |
misconfigured |
ok |
6/7 |
plugged |
ok |
wire stretched |
ok |
ok |
6/17-6/18 |
plugged |
ok |
ok |
ok |
died |
6/28 |
branch hit |
ok |
ok |
ok |
ok |
6/29 |
ok |
ok |
ok |
ok |
ok |
As far as I know, there were no sensor issues for the remainder of the experiment.
Daily storm totals (to nearest mm):
Date |
understory |
ott.pond |
tb.pond |
wxt.pond |
|---|---|---|---|---|
6/1 |
32 |
41 |
40 |
|
6/2 |
3 |
1 |
1 |
|
6/6 |
3 (plugged) |
18 |
|
|
6/7 |
1 (plugged) |
50 |
|
13 (misconfig) |
6/9 |
0 |
2 |
2 |
3 |
6/14 |
3 |
3 |
3 |
4 |
6/17 |
|
12 |
12 |
16 |
6/18 |
3 (plugged) |
10 |
11 |
13 |
6/24 |
1 |
1 |
1 |
2 |
6/28 |
0 |
0 |
0 |
1 |
6/29 |
1 (hit) |
18 |
19 |
21 |
7/3 |
9 |
7 |
7 |
9 |
7/4 |
1 |
3 |
3 |
2 |
7/5 |
4 |
12 |
15 |
11 |
7/6 |
6 |
14 |
17 |
14 |
7/7 |
0 |
3 |
3 |
3 |
7/9 |
0 |
1 |
1 |
1 |
7/10 |
1 |
1 |
1 |
3 |
7/11 |
49 |
44 |
52 |
58 |
7/13 |
0 |
1 |
1 |
1 |
7/14 |
3 |
2 |
2 |
2 |
7/15 |
4 |
3 |
4 |
3 |
Total |
139 |
259 |
207 |
191 |
Total (all sensors working) |
92 |
106 |
118 |
126 |
SUMMARY:
- Ott and siphoning tipping bucket agree very well (when totaled multiple days, agree to within 4%).
- WXT is high by about 30% (when totaled mulitple days)
- We don't have much good data from the understory gauge.
Weather: fog burning off this morning. The usual with possible showers in the afternoon
Summary: everything looks good. There was an event on the 38m and 43.9m CO2 this morning at ~7:30am.
Sonics: ok
TRH, P: ok
Wind Speed & Dir: ok
Soil, Rainr: ok
Vmote (rad, a, a2, b): 12.9, 12.8, 13.0, 12.7
Radiation, Wetness: ok
H2O, CO2: ok, spike in CO2 at 38m and 43.9m this morning, ~7:30am.
System (GPS, Vdsm): ok
Pond: ok
Sometime yesterday afternoon -- probably when I was adding Ott variables to the config -- nc_server died and we never noticed. I just manually restarted it this morning and am rerunning covars from yesterday.
Gordon and I just had this exchange, that I thought should be put in the logbook (even though it relates to an action a while ago):
I'm starting to look at the rain gauge comparison. I note a major event on 7 June that was only seen by the OTT. This caused you to change the WXT settings. For the next 2 days, Tom's daily status messages noted that rain.tb was not reporting, but this comment was dropped on 9 June. I haven't found a comment about what fix was done to get rain.tb working – did Chris just touch it?
...Steve
Yea, Chris G fixed the tb about the 2nd or 3rd day he returned. The cable had become stressed and he had to open up the shrink tube and give it some "Stumpy love".
Gordon
The chemistry people reported that AC power went out overnight on their instruments, though it was going again this morning. They lost the night's worth of data. As far as we can tell, base trailer power stayed up (cockpit was still running). (The tower stayed up, but it has a battery.) Combined with the damage to soilb, I was concerned that a branch may have hit the AC power cable running through the woods, so I did a reasonably careful inspection walking the entire line. I did see a 2" branch laying across the line (see photo) that I removed, but saw no evidence that it had damaged the cable. Both sides of the affected span were cable-tied to saplings, that could have bent to absorb the shock and the cable ties themselves were secure. There were a couple of other 1/8" sticks that also appeared not to have affected the cable.
Perhaps the outage was due to a surge?
10:50 - Soila and Soilb are back on the air. Soilb was struck by a falling tree branch
last night sending the battery 5.5m from the mote. Late in the night soila went down.
Based on the results of the repair work it appears soila is routing its data through soilb. We may try
moving the base mote again.
Sorry the image is a bit blurry, but this should give the idea that the branch broke the mount on the right side of the solar panel, hit the battery box, and is now laying on top of the soil sensors. We won't move the branch, as this is a natural event. The battery ended up another 2m to the right of this image. The mote antenna was cocked down a bit and some of the DIN cables also had been slightly pulled. The only action taken was to replace the battery box+battery and collect the scattered pieces. 
Weather: low clouds burning off this morning, potential shower in the afternoon
Summary: Rain event last night starting at 8:30pm. Lost soila and soilb. A lot of low signal diagnostics
from sonics during storm.
Sonics: ok, low signal diagnostics on all sonics during storm
TRH, P: ok
Wind Speed & Dir: ok
Soil, Rainr: rain event around 8:30pm. Soila out at ~11:00pm, Soilb out at ~8:30pm
Vmote (rad, a, a2, b): 13.0, NA, 13, NA
Radiation, Wetness: ok
H2O, CO2: ok
System (GPS, Vdsm): ok
Pond:ok
Here in Tuscaloosa, we've seen spectacular lightning to the south of us. Haven't seen evidence of it in the data yet, but our site could be getting more rain soon.
P.S. Just after I wrote this, the WWW plots updated with 1/2" of rain and a temperature drop of 4 degC in 10min.
P.P.S. And now the 32m sonic is not able to trigger properly. Tried eio 7 0/1, but didn't help.
Just in case there is an effect on the data, here is my attempt to reconstruct tours of the tower and radiometer stands:
6/19 1530-1630 Program managers tour.
6/23 1130-1400 Ann Marie and sons tour.
6/27 1300-1500 Karsten and Lindsey tour.
These events could have spikes on the 2m chemistry inlet, as people were standing near the tower base. There also could be higher Rlw.out or Rlw.in.
We had rain during lunch. It was pretty heavy for a while in Marion, but AABC didn't seem to get much. However, temperatures dropped by 8 degC, so things are very nice. (We've turned off the trailer AC.)
Steve S was on the tower from ~0915-0930 to dry off the krypton and 14m sonic. All are now working again (though sonic may have revived itself a bit earlier). Kryptons are still only about 0.1V. Steve noted that there was an obvious water drop hanging on the sonic.
Weather: overcast but starting to burn off, possible rain in the afternoon
Summary: Rain event last night at 11:30pm. 13.9m sonic went bad, IDIAG low signal, at that time and has not recovered.
8m licor CO2 seems high compared to others, will monitor.
Sonics: 13.9m sonic out at ~11:30pm.
TRH, P: ok
Wind Speed & Dir: ok
Soil, Rainr: rain last night at ~11:30pm. Tsoila.4.4cm bad.
Vmote (rad, a, a2, b): 13.0, 12.9, 13.1, 12.4
Radiation, Wetness: ok
H2O, CO2: ok, licor 8m CO2 looks high, will monitor
System (GPS, Vdsm): ok
Pond:ok
The gravimetric tests of the Qsoils are not so hot.
soil.b gravimetric readings have all been within 1% of each other (no change in soil moisture), whereas the EC5 data show a 4% change (still not much change). With such a tight clustering, we can't fit a line, but the data suggest an offset of ~-7%.
soil.a gravimetric readings are quite variable (38 - 51%), but the range in EC5 values are half as much. The middle data point doesn't agree at all, though a line with slope=1 and offset of -8% fits the remaining (2) samples.
Thus, the indication is that both EC5s are reading about 8% low. Clearly, we need a few more samples, preferably in a wider range of soil moisture conditions.
P.S. With the 4th sample taken on 3 July, there is no change to the above statements. An offset of 8% seems to be the best we can do.