TWP/SMET/C2 - RH Sensor bad at Nauru

RH sensor bad from 16 Dec 2001 03 GMT to 3 Jan 2002

• relh_sd
• Relative humidity mean(relh_mean)
• Relative humidity maximum(relh_max)
• Relative humidity minimum(relh_min)

• relh_sd
• Relative humidity minimum(relh_min)
• Relative humidity mean(relh_mean)
• Relative humidity maximum(relh_max)

TWP/SKYRAD/C2 - Reprocess: PIR identified as unshaded is really shaded

On 17Sep01 the Global PIR was moved from the unshaded position on the Skyrad stand to the 
new 'shaded' spot on the new K&Z tracker. It is still using the same Logger channel as it 
did as an unshaded PIR even though it is now shaded.

• down_long_hemisp2_max
• inst_down_long_hemisp2_case_temp
• Downwelling Longwave Hemispheric Irradiance, Shaded Pyrgeometer2(down_long_hemisp2)
• down_long_hemisp2_min
• inst_down_long_hemisp2_dome_temp
• down_long_hemisp2_std
• inst_down_long_hemisp2_tp

TWP/SKYRAD/C2 - UVB Data questionable/incorrect due to uncontrolled sensor temperature

The UVB was not temperature controlled to 25C as required
to ensure accurate data.  UVB data should ONLY be used after 
checking both the bit_data and twpskyrad20sC1.a1 uvb_temp
or inst_down_uvb_temp.  UVB data where the UVB temperature
was outside the range of 24-26C should not be used.

• Downwelling Ultra-Violet Irradiance, UV Biometer, Minima(down_uvb_min)
• uvb_min
• down_uvb_std
• uvb_mean
• Downwelling Ultra-Violet Irradiance, UV Biometer, Maxima(down_uvb_max)
• Downwelling Ultra-Violet Irradiance, UV Biometer(down_uvb)
• uvb_sd
• uvb_max

• Downwelling Ultra-Violet Irradiance, UV Biometer, Maxima(down_uvb_max)
• down_uvb_std
• uvb_max
• uvb_sd
• uvb_mean
• uvb_min
• Downwelling Ultra-Violet Irradiance, UV Biometer, Minima(down_uvb_min)
• Downwelling Ultra-Violet Irradiance, UV Biometer(down_uvb)

• uvb_uncorr_irradiance
• Irradiance, ultraviolet, downwelling (UV Biometer)(inst_down_uvb_irradiance)
• uvb_temp
• inst_down_uvb_temp

TWP/SKYRAD/C2  - IRT incorrect min/delta values

For field sky_ir_temp, the value of valid_min was incorrectly assigned to -49.7 C and no 
value of valid_delta was assigned. The actual values should be -60 and 50 C, respectively.

• IR Brightness Temperature(sky_ir_temp)
• sky_ir_temp_max
• sky_ir_temp_min

TWP/SMET/C2 - Negative rainfall rates

Due to limitations of the Zeno dataloggers all voltage measurements
from the optical rain gauge (ORG) were converted to rainfall rates. 
This resulted in negative values for rain rates.  Any value below
0.10 mm/hr should be considered to be 0 mm/hr.  New dataloggers 
alleviated this problem.

• Precipitation mean(precip_mean)
• Precipitation minimum(precip_min)
• Precipitation maximum(precip_max)
• precip_sd

TWP/SMET/C2 - Reprocess: Barometric pressure units change

Barometric pressure data during this time period is reported in hPa.  After this time, the 
data have been converted to kPa to standardize the measurement units among ARM sites and 
to conform to accepted standard units determined by the scientific community.

• Barometric Pressure(atmos_pressure)

TWP/SMET/C2 - Reprocess: Tipping bucket rain gauge added

A tipping bucket rain gauge was added to the TWP.C2 SMET suite of instruments on 20061129. 
Effective 20060926, two new variables (count and rain amount) were added to the end of 
the twpsmet60sC2.b1 datastream.  Between 9/26 and 11/29, the data for these two variables 
are filled with zeros.  Users should not use the data during this period as the zeros are 
not representative of the rain fall at the site.  When reprocessing of this datastream 
occurs these variables will be added for the 19981021-20060926 and data from 
19981021-20061129 will be filled with -9999 (missing).

• base_time

TWP/SMET/C2 - Wind Speed data contain offset due to induced voltage

The marine model of the RM Young wind sensor needs twisted pair shielded cable.  The 
manufacturer did not originally supply the pigtail with twisted pair shielded cable.  Use of 
twisted pair shielded cable for the rest of the cable run to the logger was also not 
specified.  This caused an induced voltage in the wind speed line from the wind direction 
excitation.  The induced voltage varied from sensor to sensor and probably changed anytime 
the cable was replaced or parts of the wind sensor were repaired or replaced. The induced 
voltage has been seen to vary from 0.15 m/s to as much as 1.08 m/s.

• lo_spd_arith_avg
• lo_spd_min
• lo_spd_vec_avg
• up_spd_min
• up_spd_arith_avg
• lo_spd_max
• up_spd_max
• up_spd_sd
• lo_spd_sd
• up_spd_vec_avg