Field Notes

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Other sites visited today: Hill Slough
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Mayberry: 2024-07-16 08:10:00 (DOY 198)
Author: Daphne Szutu
Others: Irene

Summary: Swapped 7500 for calibration, new CR1000 program that includes modified Bowen calcs, Porewater sipper samples, Blackberries are ripe

2024-07-16
Mayberry

Irene and I arrived at 8:10 PST (9:10 PDT). It was sunny with a strong breeze and super clear. Today would’ve been a great day to check out the view from Mt. Diablo! The staff gauge read 52cm.

Although Irene has been to Hill Slough sites multiple times for sampling, today was her first time on a regular Delta site visit. I downloaded met, cam, USB GHG, and miniDOT data. I swapped the desiccant for the miniDOT and water level sensor. The reservoir was mostly full; we topped it off. I showed Irene how to clean the flux and rad sensors.

We swapped the 7500A for calibration: sn 75H-2667 came off and sn 0073 went on. I loaded the new config file and updated the pressure coefficients. I reset the eddy clock +1:30min from 9:50 to 9:51:30 to match the laptop time and reset the 7550 box. After it rebooted, I checked that all was ok, the USB was logging, and there was no 7700 error.

I sent a new CR1000 program that adds calculations for the modified Bowen-variance method. The real-time data with the new program looked ok.

I checked the Campbell conductivity sensors as part of its routine check every 3 months. I cleaned a tiny bit of mud out of the orifice.

old 75H-2667 read: 408ppm CO2, 668mmol/m3 H2O, 21.0C, 100.8kPa, 98.5SS
clean 75H-2667 read: 419ppm CO2, 611mmol/m3 H2O, 21.1C, 100.8kPa, 101.0SS
fresh 0073 read: 417ppm CO2, 655mmol/m3 H2O, 21.1C, 100.9kPa, 103SS
7700 read: 2.0ppm CH4, 34RSSI – 73 after cleaning

Irene and I sampled the open and vegetated porewater sippers and measured their conductivity. For all samples, we rinsed the syringe with the first 10ml of sample we pulled from the sipper, then discarded that. We then pulled another 20-30ml from the sipper, which we measured.

Most of the vegetated sippers that were clogged last time remain clogged, although one depth (veg-black-yellow) that was clogged produced water this time! I have no idea what changed as there has been plenty of surface water recently.

All of the open sippers had a lot of gas coming up in the tubing. The volume in the tubing was >50% bubbles, except for open-black-white, which had only about 20% bubbles.

Open-red-yellow, 7.19 mS, 22.2C, >50% gas and much effort required to pull up sample
Open-red-red, 6.34 mS, 20.7C, >50% gas
Open-red-white, 6.71 mS, 21.4C, >50% gas
Open-red-black, 6.80 mS, 21.6C, >50% gas
Open-red-green, 6.34 mS, 21.2C, >50% gas
Open-blue-yellow, 5.25 mS, 22.3C, >50% gas and much effort required to pull up sample
Open-blue-red, 5.73 mS, 21.4C, >50% gas
Open-blue-white, 5.99 mS, 20.8C, >50% gas
Open-blue-black, 5.32 mS, 21.1C, >50% gas
Open-blue-green, 4.91 mS, 20.7C, >50% gas
Open-black-yellow, 7.20 mS, 21.9C, >50% gas and first 10ml not too hard to pull but 20ml sample required much effort
Open-black-red, 7.47 mS, 20.9C, >50% gas
Open-black-white, 7.21 mS, 20.7C, about 20% gas
Open-black-black, 7.04 mS, 22.3C, >50% gas
Open-black-green, 7.14 mS, 22.7C, >50% gas
Veg-blue-yellow, 8.71 mS, 22.7C
Veg-blue-red,,
Veg-blue-white, 9.41 mS, 25.5C, Many bubbles
Veg-blue-black,,
Veg-blue-green,,
Veg-black-yellow, 8.61 mS, 25.6C
Veg-black-red,,
Veg-black-white,,
Veg-black-black, 8.71 mS, 25.5C, A lot of sediment which kept clogging 3-way valve
Veg-black-green, 6.21 mS, 23.3C
Veg-red-yellow,,
Veg-red-red,,
Veg-red-red-red,,
Veg-red-white,,
Veg-red-black, 6.02 mS, 23.6C, Easy to pull and very few bubbles
Veg-red-green, 5.85 mS, 24.5C, Easy to pull and very few bubbles
Surface, 1180 uS, 20.7C

We ate lunch and left at 12:30 PST (13:30 PDT). We picked a handful of blackberries on the way out.

0 photos found

11 sets found

7 MB_flux graphs found