Field Notes

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Other sites visited today: East End | Bouldin Corn | Bouldin Alfalfa | Hill Slough
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Mayberry: 2024-08-15 07:20:00 (DOY 228)
Author: Daphne Szutu
Others: Kuno, Robert, Kyle, Hannah, Maoya, Dylan, Joe

Summary: 2nd day of chamber campaign for CH4 and N2O fluxes, regular data download, installed underwater PAR sensor, lower level of scaffolding broken--temporarily supported with two posts

2024-08-15
Mayberry

Kuno, Robert, Kyle, Hannah, Maoya, and I arrived around 7:20 PST (8:20 PDT) for the second day of the chamber campaign. Dylan Chapple arrived at the same time in his own car. Hannah is an undergrad student at Harvard and will be doing her senior thesis with Jackie Matthes. It was breezy, mild, and sunny. The water is much deeper today than in December and was about 90cm deep in the middle of the channel. The staff gauge read 51cm.

The chamber campaign consists of taking CH4 and N2O fluxes at open water locations around the wetland. We have two CH4 analyzers and one N2O analyzer for this campaign. We are trying to get spatially diverse samples, with both channel and edge locations. At each location, we are also measuring water parameters (pH, DO, conductivity, temperature, water depth) and recording the GPS location. At 20 locations max per day, we are also collecting a soil sample ~10cm deep for Kuno to analyze for genetic information.

Kuno and Robert were team A. They carried the CH4 and N2O analyzers in backpacks and used a small grey tub to float their other supplies. Kyle, Hannah, and I were on team B. We floating a CH4 analyzer and our other supplies in the large orange tub. The tub came up to our chest in the deeper parts of the channel. Maoya and Dylan discussed their environmental art ideas. I got Kyle and Hannah started with measurements, then started tower work around 9:30 PST when Joe arrived. Dylan left to go back to work and Maoya joined Kyle and Hannah as team B. Kyle’s waders had a major leak so she swapped to my pair since I was getting out of the water. Dylan let us borrow his (brand new) waders for the next few weeks, since with Kyle’s leak we are down a pair. We can return it to him at the Ameriflux meeting in early September.

I downloaded met, cam, and USB GHG data. Joe installed an underwater PAR sensor sn UWQ11698 about 5m east of the tower and about 50cm underwater. The sensor is on the eastern edge of a cattail patch. It is wired to an extension box about 3m from the tower. I sent a new CR1000 program to record the new PAR data column. We’ll need to get the calibration coefficient to convert the mV reading to umol/m2/s in post-processing. We cleaned flux and rad sensors.

As Joe was wading around, he noticed that the NE corner of the tower had broken and the SE corner had buckled. Joe clamped on two long posts to support the eastern side of the tower. He had brought these posts for work at East End later today. In two weeks we’ll swap out the bottom layer of the scaffolding using our extra scaffolding pieces at West Pond.

The 7500 read: 418ppm CO2, 736mol/m3 H2O, 23.9C, 100.9kPa, 104SS – 105 after cleaning
The 7700 read: 1.97ppm CH4, 58RSSI – 73 after cleaning

We measured surface water conductivity off of the tower.
Sample, temperature-compensated conductivity, temperature
Surface, 1205 uS, 22.4 C

Joe and I left around 10:35 PST (11:35 PDT) to service other Delta sites.

Kyle called me around lunchtime to troubleshoot the GPS. They had unintentionally turned off the GPS, and couldn’t figure out to get it set up again. They needed to enable GNSS, but I couldn’t remember exactly which combo of menu options they needed to get there. I told them just to store the afternoon GPS points on their phones. The GPS file from the morning was not “closed” properly, so hopefully that data can still be retrieved by Nico.

The chamber samplers picked blackberries and headed home around 13:30 PST (14:30 PDT).

6 photos found

20240815MB_BrokenScaffolding.jpg ( 2024-08-15 10:14:28 ) Full size: 1440x1920
Northeast post on lower scaffolding level has rusted and broken

20240815MB_HannahKyleMaoya.jpg ( 2024-08-15 10:52:04 ) Full size: 1920x1440
Hannah, Kyle, and Maoya sampling CH4 fluxes at Mayberry

20240815MB_KunoRobert.jpg ( 2024-08-15 10:51:55 ) Full size: 1920x1440
Kuno and Robert sampling CH4 and N2O fluxes at Mayberry

20240815MB_MaoyaDylan.jpg ( 2024-08-15 09:16:03 ) Full size: 1920x1440
Maoya and Dylan in the water at Mayberry for the chamber campaign

20240815MB_DaphneKyleHannah.jpg ( 2024-08-15 00:00:00 ) Full size: 1920x1440
Daphne, Kyle, and Hannah sampling B1 at Mayberry for CH4 fluxes

20240815MB_HannahDaphneKyle.jpg ( 2024-08-15 00:00:00 ) Full size: 1920x1440
Hannah, Daphne, and Kyle wading in waist-deep water in the Mayberry channel