Turnipseed CO2 and H2O profile Data Instructions

Investigator: Andrew Turnipseed, NCAR/ACD
turnip@ucar.edu
Date: 1/25/2012

Filename:  TurnipseedROMBAS_CO2_H2O.csv (comma delimited)

Data Interval:  5 min. averages
Initial Start time of file:  July 1, 2011, 0:00:00  (MST)
Measurements are made from 6 inlets at different heights.
Measurements are made from each inlet for 5 min., cycling through all 6 inlets over a 30 min. period.
These are denoted in the column labeled "z".  Heights are:
z1 = 1.5 m
z2 = 5.0 m
z3 = 8.5 m
z4 = 12.0 m
z5 = 17.7 m
z6 = 25.1 m
Missing data = -9999

Columns:
Start_sec:	Beginning of 5 min. period  (seconds since July 1, 2011, 0:00:00 MST)
End_sec: 	End of 5 min. period  (seconds since July 1, 2011, 0:00:00 MST)
Mid_sec:	Midpoint of 5 min. period  (seconds since July 1, 2011, 0:00:00 MST)
Date:		MM/dd/YY, 
Time:		hh:mm:ss, Beginning of 5 min. period (MST)
Day of Year:	decimal day, Beginning of 5 min. period (MST)
CO2:		carbon dioxide mixing ratio, ppmv
H2O:		Water vapor mixing ratio, mmol/mol
z:		Inlet height, m

Instrumentation:
Licor Li-6262 	

Sampling Notes: Each inlet was sampled for 5 min. (6 inlets - 30 min. for complete profile)
starting with the lowest inlet at the beginning of the 30 min. period.

Calibrations:  Both the CO2 and H2O channels were automatically zeroed every 6 hours using 
scrubbed zero grad air.  CO2 was calibrated every 6 hours by adding a 400 ppmv CO2/air 
standard from Scott-Marrin.  H2O was not automatically calibrated, but was scaled using 
meteorological data (T, RH, P) from the WXT520 sensors on the tower at 4 heights.