Field Notes

<--2017-03-01 10:50:00 | 2017-03-15 13:25:00-->
Other sites visited today: Mayberry | Sherman Wetland | Twitchell Rice

Twitchell Alfalfa: 2017-03-08 09:15:00 (DOY 67)
Author: Daphne Szutu
Others: Joe Verfaillie

Summary: Swapped IRGA, data collection/cleaning

2017-03-08
Twitchell Alfalfa

We arrived at 9:15. It was sunny, windy, with a few thin clouds. There were sheep to the west of the tower. There was fencing around our tower and equipment, but it didn't seem to be electrified.

We switched the LI-7500: sn 75H-2514 came down, sn 75H-2176 went up. I uploaded a new config file for the head and updated the pressure coefficients based on what was in the Licor box.

LI7500 readings:
CO2 418.8 umol/mol --> 421.51 after swap
H2O 433.2 mmol/m3 --> 440.2 after swap
T 13.96 Celsius --> 13.11 after swap
P 102.8 kPa --> 102.7 after swap
SS 102.1 -> 90.48 after swap

I collected met and USB GHG data and swapped camera cards. There was one, corrupted photo on the card. It's a 4GB card, so it's possible the CR1000 at this site has outdated firmware and can only deal with 2GB CF cards.

We also filled in some of the squirrel holes by the main tower and by the radiation tower.

We left at 9:45.

1 photos found

20170308TA_Geese.jpg ( 2017-03-08 09:07:52 ) Full size: 1920x1440
Lots of geese on the field south of TA