Field Notes

Hill Slough: 2024-01-04 09:18:00 (DOY 4)
Author: Joe Verfaillie
Others: Dennis

Summary: Quick grab of year end data. All seemed well.

Hill Slough
2024-01-04

Dennis and I arrived at 9:18 PST. It was clear sunny and mild with almost no wind for a change. The tide was high: water level was 5.90ft at 9:47. There was a flock of white pelicans far out on the water.

This was a smash and grab field visit to get the end of year data. I collected the miniDot data. The sock was full of shrimp as usual but no problems were noted. I did not disturb the other water sensors. The enclosure door latch here needs to be reattached.

At the tower Dennis refilled the wash reservoir by 1/3 and cleaned the eddy and radiation sensors.
The 7500 read: 441.9ppm CO2, 398.2mmol/m3 H2O, 13.2C, 102.9kPa, 103.4SS
The 7700 read: 2.09ppm CH4, 56.5RSSI – 74.0 after cleaning
The door of the 7550 box was closed but not latched. I didn’t see any evidence of water inside and made sure it was latched before we left.

The rain bucket was clean. I collected the flux, met and camera data. I pulled pore water for salinity. I stuck the probe in both the first batch of water drawn and again in the second batch with no change in readings.

Original uncompensated readings:
Porewater, 6.8mS, 11.3C, flush uncompensated
Porewater, 6.8mS, 11.3C, uncompensated
Surface water, 4.03mS, 10.0C, uncompensated

Daphne calculated temperature-compensated conductivities using the EC300A's default temperature coefficient of 1.91%.
Porewater, 9.2mS, 11.3C, flush
Porewater, 9.2mS, 11.3C
Surface water, 5.6mS, 10.0C

We left at 9:50.

1 photos found

HS_picam_20240103_1715.jpg ( 2024-01-03 17:15:06 ) Full size: 1917x1440
Interesting light at low tide