The kryptons were plotted alongside several other variables to collaborate data integrity. Those variables included; the leaf wetness' sensor for indications of rain/moisture, the 'kh2oV' which would drop in response to moisture on the transducers (a value below the threshold of 1.0 Volts was a good indicator), and finally the 'H2O' alongside a theoretical H2O with the relative humidity set to 100%.

Infrared H20/CO2 analyzers (Li7500 and EC150)

Between the 6th and 11th of October, the Tsoil values for the 'Grass' site were returning erratic data; upon closer inspection it was found that there was an unknown error in the data system that jumbled the recording of two's complement data into columns of the 'Tsoil' vector. A script was written to parse the raw data and realign it in its proper format. Using this script, the data for the sensors at the 0.6, 1.9 and 3.1cm heights was salvaged in part. No data could be found/reconstructed for the 4.4 cm sensor due to the nature of the error.

The temperature and relative humidity data were constrained to one another for the quality control process. Most instances of data removal were in response to moisture on the transducer (as prompted by the leaf 'wetness' sensor). Also important was the use of the 'Ifan' variable as an indicator of the TRH fan current. Values outside a threshold usually indicated instances of sensor failure and were edited as necessary.

2 types of barometers were used for SCP -- Vaisala PTB220B and Paroscientific Model 1600 in nanobarometer mode. One nanobarometer was deployed at 5m.M at the start of the project and was damaged by the lightning strike.  We determined that its RS232 data port was blown, but were able to rewire it to use RS422.  Later, we suspected (how?) that its calibration may have shifted also due to the strike.  After SCP, Paroscientific repaired the RS232 port and recalibrated this sensor.  Another 3 nanobarometers were received during the project and installed on 9 Nov at stations 5 (new), 10 (replaced PTB220), and 1m.M (replaced PTB220).  Barometers also are included in the Li7500s at 1m.M and 2m.M and in the EC150 deployed 12 Nov at 3m at station 8.

The PTBs had pre and post calibrations done in the lab against our Paroscientific transfer standard.  The nanobarometers had recent factory calibrations (purchased in 2012) so only a post cal check was done.  The result of this check had the following differences with respect to the transfer standard:

Post cals of all sensors will be done using the new Ruska pressure generator that we just (1 Apr 2013) received. Initial tests suggest that the transfer standard used for SCP may have been on the order of 0.2mb low, which would explain the majority of the differences seen above.

Comparison of the 5m.M and 1m.M nanobarometers show a difference of 0.18mb (after accounting for the height difference).  This is in close agreement with the post cal data that showed a difference of 0.16mb between these sensors.

PTB220 post calibration results:

All of these calibrations are quite close, with the exception of sensor 1 that likely had been a while since its last calibration.  Comparison of the PTB220 and nanobarometer during the swap on 9 Nov showed differences on the order of 0.1mb (1m.M) and 0.2mb (station 10).

With all this information, we get the consistent picture that the standard used for pre and post cals likely had an offset of about 0.2mb.  Taking this offset into account, the calibrations of the remaining sensors (both PTB and nano) were within 0.05mb (and many within 0.02mb) of pre-calibrations, with 2 exceptions.  The exceptions were PTB 0001, that was taken from MFO without a recent pre-cal and Nano 122850 that had been hit by lightning. 

Offsets are shown in the last column of the above tables that correct all of the data to one standard (arbitrarily taken to be the median of the most recently-calibrated nanobarometers).  These offsets will be included in the final data set.

Below is a plot of Pressure vs. (GPS-derived) Measurement Elevation for all stations before and after the PTB/Nano swap and EC-150 addition.  The departures from linear behavior likely are due to errors in the GPS data.