Field Notes

<--2020-04-25 09:00:00 | 2020-05-29 08:30:00-->
Other sites visited today: Sherman Barn | Sherman Wetland

Mayberry: 2020-05-21 10:45:00 (DOY 142)
Author: Daphne Szutu
Others: Joe

Summary: Regular data collection/cleaning, 7700 calibration, swapped 7500 for calibration, installed floating forced diffusion chamber, cleaned conductivity sensor, cleaned precip bucket, water samples for Isabel, goats on grass road

2020-05-21
Mayberry

Joe and I arrived at 10:45 PDT. It was a sunny, mild, and breezy day. There were goats on the grass levee road, all the way up to our solar panels. The shepherd helped us move our cal gases and equipment through the goat enclosure and past the guard dogs. The water level was 43 cm. We made some tower height measurements:
Sonic to water level = 510 cm
Sonic to soil surface = 602 cm

We calibrated the 7700 sn TG1-0223. The offsets were small. We also swapped the 7500 for calibration: sn 0065 came off and sn 0035 went on. I sent a new configuration file, updated the pressure coefficients, and reset the 7550 box. I confirmed the 7700 was connected and the USB was logging.

I downloaded met, cam, miniDOT and USB GHG data. We collected water samples for Isabel at 9:45 PST. I forgot to bring the water grabber, so I hung off the NE corner to collect them. I swapped the desiccant for the miniDOT and the water level sensor. The precip bucket hasn't had many tips in the past few weeks--Joe cleaned out a bunch of spiderwebs - there might be some spurious tips.

Joe got in the water to install the fluorometer, but it was overloading the power system, so we brought it back to the lab to test. The fluorometer had just come back from the factory after repair/upgrade, and I hadnâ€™t tested it in the lab yet.

Joe also installed a new FD chamber (sn FD20190027) from the floating boom. Next time we should add a collar to this chamber to give it a bigger height range where the water can be above the lip of the chamber but below the diffusion windows. We connected the FD chamber to power by cutting off the eos connectors and pulling the loose wires into the datalogger box. Next time we need a serial connector to download the FD chamber.

Joe cleaned the conductivity sensor (it was full of mud) and tested it in DI water and in a YSI 10,000 uS calibration solution. Temperature-corrected conductivity readings for sn 5688:
Before cleaning, in wetland: 1.17 (have to check units)
After cleaning, in DI water: 0.54
After cleaning, in 10,000 uS calibration soln: 10.15-10.25
After cleaning, in wetland: 4.12

LI-7500 readings (sn 0065 --> sn 0035):
I forgot to write the 7500 numbers after cleaning sn 0065, but they were reasonable.
CO2 412ppm --> 424
H2O 657ppm --> 561
T 23.3C --> 24.7
P 101.5kPa --> 101.4
SS 98--> 99

LI7700 readings (before calibration -->after cleaning --> after calibration):
CH4 2.0ppm --> 2.0 --> 1.98
RSSI 49--> 87--> 86

We left at 11:55 PDT.

3 photos found

IMG_2557.jpg ( 2020-05-21 11:21:29 ) Full size: 1920x1440
New FD Chamber on floating boom

20200521MB_CloggedConductivity.jpg ( 2020-05-21 11:17:16 ) Full size: 1440x1920
Conductivity sensor orifice filled with mud at Mayberry.

20200521MB_ATVGoats.jpg ( 2020-05-21 10:40:11 ) Full size: 1920x1080
Shepherd helping us transport cal gases and other equipment through the goat enclosure to the tower.