Field Notes

Mayberry: 2014-05-07 10:45:00 (DOY 127)
Author: Cove Sturtevant
Others: Joe

Summary: Forgot portable tower truck key. Portable tower 7700 lost line lock on 5/5 - reason unknown. Took GPS reading and sonic orientation of LowVeg portable tower location. Scoped out HighVeg location for next week. New interface to 7700 fixed spin mirror issue

Mayberry
2014-05-07

Portable Tower
Joe and I arrived at the Low Veg (north) portable tower location at about 10:45 PDT. It was sunny and cool with a strong breeze right down the window to the large area of open water at this site. We forgot the keys to the truck so it has to stay here another week. This isnâ€™t such a setback because we found that the 7700 has lost line-lock late in the evening on 5/5. A look at the data revealed some quick dropouts previous to 5/5 which seemed to correspond with very high winds. We reset the line-lock and everything was running fine.

Joe was thinking of mounting the solar panel on the truck somehow to give it better exposure for low sun angles.

Downloaded the data.

Took GPS reading of Low Veg tower location: 38.05505Â° N, 121.7689Â° W
Sonic orientation: 329Â° N magnetic.

We set the 7700 cleaning settings using the new software interface. This fixed the issue with the bottom mirror spinner â€“ sweeeeeet. Looks like the instrument wasnâ€™t able to spin the mirror because the settings didnâ€™t make sense saved in the old format.

We also scoped out the site for the high veg location. Looks like it will work great. The location for next week is:
38.049681Â° N, 121.770027Â° W

CO2: 400 ppm (402 after cleaning)
H2O: 444 mmol m-3 (475 after cleaning)
signal strength = 89.9% (90.6% after cleaning)
t: 17.6 Â°C
p = 101.4 kPa
sos = 344.2 m s-1
CH4: 0 ppm (1.92 ppm after line lock)
RSSI: 35% (88% after cleaning)

Permanent Tower
Site is nice and green with a clear layer of dead plant material. All was well. Updated 7700 settings with new interface. A-OK.

7500 readings:
CO2: 398 ppm (401 after cleaning)
H2O: 510 mmol m-3 (480 after cleaning)
signal strength = 93.7% (95.2% after cleaning)
t: 19.6 Â°C
p = 101.4 kPa
sos = 343.5 m s-1

Current 7700 readings:
CH4 = 1.98 ppm (same after cleaning)
RSSI = 45% (71% after cleaning)
Reservoir was empty. Refilled.

Met looked great.

0 photos found

11 sets found

7 MB_flux graphs found