Field Notes

<--2020-05-29 09:00:00 | 2020-06-16 08:45:00-->
Other sites visited today: East End | Bouldin Alfalfa | Bouldin Corn

West Pond: 2020-06-09 08:30:00 (DOY 161)
Author: Joe Verfaillie
Others: Daphne, Ariane

Summary: Ariane taking water samples, standard data download, water level still getting lower.

West Pond
2020-06-09

Daphne and Ariane arrived at 8:30 and I arrive at 9:00. When I got there Daphne and Ariane were just finishing up taking pore water samples at the tower. The water level is 26cm, essentially zero. It was a clear and hot day with a light variable breeze. I don’t think West Pond looks as green as the other sites and the tules don’t have as many flowers maybe due to the ongoing low water here.

I collected the data.
7500 read: 420.3ppm CO2, 504.1mmol/m3 H2O, 26.9C, 102.1kPa, 97.4SS – 100.1 after cleaning
The 7700 read: 2.03ppm CH4, 57 RSSI – 74.5 after cleaning
I forgot to bring new tubing for the 7700 wash system. The mirror looked pretty dirty but the RSSI was not so low and the wash reservoir was mostly full – I topped it up.

I did not collect the miniDot as it is hanging in the air.

I left at 9:30 and Daphne and Ariane continued water sampling:

Ariane: Daphne and I sampled porewaters at the tower, 0.5, 0.7 and 0.85 footprint sites at depths between -10 and -50 cm. The water level was below - 10 cm across all sites except at the tower, where we did find water at -10 cm. Slight differences were observed with depth, with increasing conductivity and salinity, but pH was mostly constant. Readings were similar across all sites.

Readings at the tower (porewaters)
Conductivity: 520 uS
Salinity: 0.29 ppt
pH: 6.15
Temp: 15.6 C
DO: 20.5%

We took a surface water sample at the outlet weir, which had the highest conductivity/salinity, pH and lowest DO compared to porewaters at the wetland. We opened the inlet to take a river endmember sample but water did not flow out. Bryan said he will reprime the siphon on Wednesday 06/10.

Daphne and I left at 11:10 am, Daphne drove to Bouldin to meet with Joe.

0 photos found

Graphs display:
8 sets found

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1 WP_DO graphs found

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14 WP_met graphs found

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5 WP_flux graphs found

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