Field Notes

Twitchell Alfalfa: 2018-02-13 11:10:00 (DOY 44)
Author: Daphne Szutu
Others: Joe, Sam, Alex Valach, Tim Lu

Summary: Regular data collection/cleaning, soil respiration, veg height, moved difPAR to CR10x to fix precip under-measurement problem

2018-02-13
Twitchell Alfalfa

We arrived at 11:10. It was clear, sunny, and cool. It was also breezy and there was good visibility. We could see some smoke from burning on Staten Island. The field is greening up and the nettles are coming back up, but alfalfa is less than 50% of the cover.

Tim collected veg height data. Sam did soil respiration and cleaned the rad sensors. Alex glued bird spikes on the camera. I downloaded met, soilCO2, camera, and USB GHG data. I also cleaned the 7500.

LI-7500 readings:
CO2 390ppm
H2O 370ppm
T 14.8C
P 102.4 kPa
SS 98 --> 103 after cleaning

Joe moved the difPAR from the CR1000 to CR10x sn 48042, which should fix the precipitation measurement. When the difPAR was on the CR1000, the precipitation was under-measured: the precipitation pulse measurement had to be on the fast scan (500 mSec frequency) rather than the slowsequence (10 Sec frequency), so out of every 10 sec interval, we were only capturing the first 0.5 sec of precipitation. We uploaded a new program to the met CR1000, AlfalfaTowerMet_20180213.CR1.

We left at 11:55.

1 photos found

twitchellalfalfa_2018_02_13_112352.jpg ( 2018-02-13 11:24:28 ) Full size: 1296x960
Tim doing veg height