We arrived at Alfacada first thing in the morning and spent the full day there. Before that, though, we stopped at Eurecat because we stored our sensors there, because we could not set up the tower on the last fieldwork date, because it started raining.

We started setting up the radiometer boom and flux sensor post. We realized we were missing the horizontal pole and that we had left the sonic anemometer at Eurecat. We called Pep, and he could get us a pole of the same dimensions, and Judith brought us the sonic.

After a bit of delay, we got everything mounted.
Tower height (center of sonic): 4.35 m
Lat: 40.6823
Lon: 0.838E
Elavtion: 4.6 m above SL?
veg. height: 142 cm
Sonic north spar: 305º true north (NW)
Sonic to 7500 distance: 20 cm (standard since we are using licor mounting kit)
Sonic to 7700 horizontal distance: 44 cm
Sonic to 7700 vertical distance: -9 cm (revise!)

7500 positions for eddy pro:
Northward sep: -9
Eastward sep.: 20
Vertical sep.: 0
angle relative to north spar: -25º

7700 positions for eddy pro:
Northward sep: 0
Eastward sep.: 44
Vertical sep.: -9
angle relative to north spar: -65º

We left at 19.30h local time to do regular tower maintainance at Riet vell

Readings:
LI-7500
CO2 ppm: 427
H2O ppm: 14.3
T: 15.11
P kPa: 100.78
SS%: 100.6

LI-7700
CH4 ppm: 2.05
RSSI%: 79.5