Field Notes

<--2020-08-05 09:25:00 | 2020-09-01 15:05:00-->
Other sites visited today: East End | Bouldin Corn | Bouldin Alfalfa
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West Pond: 2020-08-21 09:05:00 (DOY 234)
Author: Ariane Arias-Ortiz
Others: Daphne, Christiana

Summary: Regular data download and porewater sampling, boards were put back at the outlets, installed miniDOT, swapped 7500 for calibration

Daphne, Christiana and I arrived at West Pond at 9:05 PDT. The air quality was bad, lots of smoke from the wildfires. There was a little breeze and we could still hear the birds. The water level was below the staff gauge (the mud was at 18-19 cm). The wetland was dry with no standing water, Ariane installed the boards at the riser weirs with the aim of flooding the wetland again the week of the 24 - 28, August. Porewaters were found below -20 cm.

Daphne downloaded met, cam, and USB GHG data. She swapped the LI-7500A for calibration: sn 0041 came off and sn 75H-2150 went on. She updated the configuration file, changed the pressure coefficient, and reset the box. She cleaned flux and rad sensors, topped off the wash reservoir, and swapped the water level desiccant. She also installed a new miniDOT (sn 180871), which is hanging in air between the wooden deck and the east side of the tower.

LI-7500 readings (sn 0041 --> sn 0041 after cleaning --> sn 75H-2150):
CO2 410ppm --> 414 --> 414
H2O 750ppm --> 730 --> 759
T 21.1C --> 21.7 --> 22.6
P 101.1kPa --> 101.1 --> 101.1
SS 97--> 100 --> 100
LI7700 readings:
CH4 2.05ppm
RSSI 58 ->74 after cleaning

She left at 9:45 PDT but came back briefly at 11:25 PDT to clean the conductivity sensor, which had a little mud but nothing too notable.

I sampled porewaters at the tower and at the 0.5 footprint as part of the dry/rewetting experiment at West Pond started in July. The water level has gone down by at least 20 cm since last sampling day (July 31st). The sippers at -10 and -20 cm were dry, therefore porewaters were sampled at -30 and -50 cm at the tower and at -30, -40, -50 and -60 cm at the 0.5 footprint site. Conductivity, salinity and pH values were similar among sites and depths, no clear patterns observed.

Average porewater values at the Tower
Conductivity: 362 uS
Salinity: 0.20 ppt
pH: 6.12
T: 18.7 C
DO: 0.8% (0.08 mg/l)

I left at 11:20 PDT

1 photos found

20200821WP_Spider.jpg ( 2020-08-21 11:44:34 ) Full size: 1440x1920
Western spotted orbweaver spider by the WP boardwalk. This spider was identified by an app in less than 1 second.