Field Notes

<--2020-11-03 12:10:00 | 2020-12-03 14:30:00-->
Other sites visited today: Mayberry | Hill Slough
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Sherman Wetland: 2020-11-12 11:20:00 (DOY 317)
Author: Daphne Szutu
Others: Joe

Summary: Permanent: Regular data download/cleaning, calibrated 7700, attempted to calibrate tipping bucket, removed HMP155/GlobeTC
Temporary: Decommissioned site, measured instrument heights

2020-11-12
Sherman Wetland

Joe and I arrived at 11:20 PST. It was a mild, still, and sunny day with hazy horizons. The water level has come up and there is even water under the tower now. The staff gauge read 71cm.

I downloaded met, camera, and USB GHG. Joe cleaned flux and rad sensors. We left some mothballs in the met box and the CR10x box.

We tested the tipping bucket sn 65552-615. I cleaned out the tippers and then dripped 475ml of water through the bucket which should result in 100tips. We got 92 tips. We turned its set screw two full rotations CW. We tested it again with another 475ml of water and got 96 tips. We left it as is. Joe thought the bottle was dripping water too quickly, so the bucket was undercounting. Weâ€™ll test again with a smaller hole at the bottom of the bottle.

We calibrated LI-7700 sn TG1-0424. The zero and span offsets were small. The 7700 wash/spin settings looked fine. The optics RH was 12%, so we did not change the drierite or flush the head space.

We removed the GlobeTC, HMP155 (sn R0360206), and CR1000 sn 4190 and brought them back to the lab. Weâ€™ll add an AMP PAR sensor and move it to WP for a comparison.

LI-7500 readings:
CO2 427ppm
H2O 420ppm
T 13.7C
P 101.9kPa
SS 101--> 103 after cleaning
LI7700 readings:
CH4 2.2 ppm --> 2.2 after calibration
RSSI 57--> 80 after cleaning

We left at 12:25 PST.

2020-11-12
Sherman Wetland Temporary Tower

Joe and I arrived at 12:40 PST. It was a mild, still, and sunny day with hazy horizons. There was lots of cattail fluff in the air. There were mushroom-shaped smoke clouds to our north.

We removed all the sensors except for PARin, which was stuck to the rad boom. We brought all the sensors and cables back in. Still at the tower are the well pipe, grounding rod, and grounding cable. The solar panels, batteries, and solar charge controller remain at the site.

We measured some instrument heights:
7500 height = 476cm
Sonic height = 476cm
Sonic heading = 14 deg N true
7700 heights = 432cm
HMP height = 432cm
4-way rad height = 361cm
4-way rad length along boom = 250cm west
PARin height = 370cm
PARin length along boom = 211cm west
PARout height = 356cm
PARout length along boom = 217cm west
Picam height = 337cm
Top of pipe to water level = 70cm
Top of pipe to ground = 74cm
Top of pipe to sensor = 147cm

Equipment removed:
WM 1590: sn 153803
LI-7700: sn TG1-0211
LI-7500A: sn 75H-2180
LI-7550: sn AIU-0650
PTB110: sn H0160093
CR1000: sn 50889
AM16/32A: sn 1164
AM25T: sn 2856
HFP 1: sn 00245
HFP 2: sn 10809
eosGP: sn GP20150111
SRS-Ni NDVI: sn 2046503368
SRS-Ni NDVI: sn 2046503402
CNR1: sn 990181
PAR-LITE out: sn 050596
PAR-LITE in: sn 050597 (not removed; couldn't remove from boom)
HMP60: sn G4540021
Water Level CS450: sn 20010770
Pi-cam: sn RPI0W-004

We left at 14:30 PST. I downloaded the met, flux, and cam data back in the lab.

2 photos found

siwetland_2020_11_12_114405.jpg ( 2020-11-12 11:46:14 ) Full size: 1296x960
Joe cleaning radiometers