Field Notes

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Other sites visited today: Mayberry | Twitchell Rice | East End | West Pond
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Twitchell Alfalfa: 2016-01-12 12:44:00 (DOY 12)
Author: Patty Oikawa
Others: Elke Eichelmann

Summary: Swapped sonic, soil respiration measurements, FD removed due to ripped membrane, profile A 8cm cable replaced, computer died

Arrived at 12:44pm. It was really cloudy so we did not do spectral measurements. There was sheep fencing installed along the southern edge of the field but no sheep in sight. Veg height on the western part of the field was slightly higher than the eastern side, with an overall veg height of 5-10cm. The road along the field to the tower was really muddy so we parked at the edge of the field and walked in. Elke downloaded data and swapped the sonic. New sonic sn 153805 replaced old sonic sn 120908.
I made soil respiration measurements (3-5 umol m-2 s-1). The atm FD chamber wall was ripped open so I removed the entire FD chamber sn FDC-11-13-006 including the thermocouple from channel 15, but left the panels in the box (panels 7&8). Vaisala CO2 probes sn L2030063 and sn L2030064 were removed with the chamber.
The profile A 8cm Vaisala probe was maxing out at 5000mV and the red light on that panel was on. Elke noticed that the cable to the sensor had been chewed so I took one of the FD chamber wires and swapped out the chewed one. By the time I was done the computer had died so I could not check to see if this fixed the problem. Also I could not change the settings back on the CR1000 to collect every 30min instead of every 10s. This needs to be addressed on the next visit.
Elke and I installed more black conduit around the ends of the cables to help prevent this from happening again.

7500 readings:
CO2 = 493.0 ppm
H2O = 458.6 mmol m-3
signal strength = 99.7% (102.8 after cleaning)
t = 14.86 C
p = 102.12
sos = 343.59 m s-1 (338.94 after swap)

0 photos found

7 sets found

Can't check TA_met
11 TA_met graphs found