Field Notes

Hill Slough: 2024-08-07 08:40:00 (DOY 220)
Author: Daphne Szutu
Others: Joe, Kuno

Summary: Biomet Olympics 200m gas tank trundle, Front gate lock cut - replaced, 7700 calibration, Low tide only mud at the water sensors

2024-08-07
Hill Slough

Joe, Kuno, and I arrived at 8:40 PST. It was warm, sunny, and breezy with some tiny patches of high thin clouds. It was near low tide (still ebbing) and there were lots of small wading birds and some large pelicans wandering around.

The first event of the 2024 Biomet Olympiad took place at the Hill Slough venue. Daphne, Joe and Kuno (team DJK) competed in the first event of the mixed Hexathalon: the 200m gas tank trundle. Kuno got team DKJ a lead making quick work completing a lap down the boardwalk and back with two tanks strapped to a dolly in record time.

Someone had cut our front lock (lock at the start of the boardwalk). Joe went to Ace Hardware to buy a new combo lock and set it to our usual code. The back lock (near the tower) was untouched. I guess someone just really wanted to fish from our boardwalk.

The staff gauge read 3.77 ft at 9:12 PST. Water level was very low and most of the water sensors were out of the water.

I downloaded met, cam, and USB GHG data. Kuno cleaned the radiometers and I cleaned the flux sensors. The reservoir was 1/3 full; we refilled it. We saw that Mel had attached one of her bird recorders on the upper level of the scaffolding.

We calibrated the 7700. It wasn't too windy yet, so it was a good choice to come here first. The offsets were small and we replaced the hat and spray nozzle after the calibration. We tested the spin/spray and noticed that the tubing had a leak on the bottom where it connects to the reservoir and at the top where it connects to the nozzle. Joe fixed the bottom leak, but we didn't have baby zip ties to properly fix the top leak. Joe observed that there was still some water getting onto the mirror, just not the full amount. It should be ok temporarily.

We measured pore water conductivity at the tower and surface water conductivity at the channel.

Sample, Temperature-compensated conductivity, Temperature
Porewater, 7.65mS, 27.2C
Surface, 3465uS, 24.1C

At the channel, I downloaded the miniDOT. I didn't swap the desiccant because we didn't have any dry minipaks today. The miniDOT was barely in the water and the EXO, eosGP, and CTD were out of the water. The channel is slightly deeper to our east and we could get another 5cm of water depth if we moved everything 2m to the east. Eventually that area of the channel will also fill in, though.

7500 read: 418ppm CO2, 650mmol/m3 H2O, 27.4C, 101.5kPa, 100SS—101.9 after cleaning
7700 read: 2.01ppm CH4, 25RSSI – 87 after cleaning
7700 calibrated read: 2.08ppm CH4, 83RSSI

We left at 9:45 PST.

0 photos found

4 sets found

21 HS_met graphs found