TWP/SMET/C1/C2 - Switch to new Data Header Formats not timely

On April 1, 2001 at 00:00:00 new data header with consistent variable naming conventions, 
etc were to be used for all sites, all data streams.  At the TWP sites the time of the 
movement to the new convention did not occur precisely at 00:00:00.  The following data 
files contain between 40 seconds and 20 minutes of data from 4/1/02 in the old format.  The 
delayed format change did not affect data quality in any way.

twpsmet60sC1.a1.20010401.000001.cdf
twpsmet60sC1.b1.20010401.000001.cdf
twpsmet60sC2.a1.20010401.000000.cdf
twpsmet60sC2.b1.20010401.000000.cdf

• lo_dir_vec_avg
• lo_spd_vec_avg
• up_spd_min
• up_spd_max
• Mean Air Temperature or Hardware Error(temp_mean)
• relh_sd
• temp_sd
• internal_voltage
• Barometric Pressure(atmos_pressure)
• up_spd_vec_avg
• Precipitation mean(precip_mean)
• base_time
• logger_temp
• Precipitation maximum(precip_max)
• lon
• up_dir_vec_avg
• precip_sd
• lo_dir_sd
• Precipitation minimum(precip_min)
• vappress_sd
• Vapor pressure mean(vappress_mean)
• tbrg_count_total
• up_spd_arith_avg
• lat
• time_offset
• lo_spd_min
• tbrg_total
• lo_spd_max
• lo_spd_arith_avg
• up_dir_sd
• lo_spd_sd
• alt
• time
• Relative humidity mean(relh_mean)
• up_spd_sd

• up_dir_sd
• up_spd_max
• logger_temp
• time_offset
• up_spd_min
• Mean Air Temperature or Hardware Error(temp_mean)
• lo_spd_sd
• up_spd_sd
• tbrg_count_total
• lon
• lo_dir_vec_avg
• Precipitation maximum(precip_max)
• relh_sd
• internal_voltage
• base_time
• lo_spd_min
• Relative humidity mean(relh_mean)
• precip_sd
• tbrg_total
• temp_sd
• Vapor pressure mean(vappress_mean)
• up_spd_vec_avg
• up_dir_vec_avg
• lat
• lo_spd_max
• Barometric Pressure(atmos_pressure)
• up_spd_arith_avg
• lo_spd_arith_avg
• lo_spd_vec_avg
• Precipitation minimum(precip_min)
• time
• alt
• vappress_sd
• Precipitation mean(precip_mean)
• lo_dir_sd

• Mean Air Temperature or Hardware Error(temp_mean)
• lat
• Wind #2 speed maximum gust(wind2_spd_max_gust)
• vappress_sd
• relh_sd
• time_offset
• Vapor pressure mean(vappress_mean)
• bit_data
• Wind #2 speed arithmetic average(wind2_spd_arith_avg)
• temp_sd
• internal_voltage
• Wind #2 speed maximum(wind2_spd_max)
• Wind #1 speed arithmetic average(wind1_spd_arith_avg)
• alt
• Wind #1 speed vector average(wind1_spd_vec_avg)
• Wind #2 speed vector average(wind2_spd_vec_avg)
• external_voltage
• Wind #1 speed minimum(wind1_spd_min)
• wind1_spd_sd
• wind2_dir_sd
• Temperature maximum(temp_max)
• Wind #1 direction vector average(wind1_dir_vec_avg)
• Barometric Pressure(atmos_pressure)
• Temperature minimum(temp_min)
• Wind #2 speed minimum(wind2_spd_min)
• lon
• Precipitation maximum(precip_max)
• Wind #1 speed maximum(wind1_spd_max)
• Precipitation mean(precip_mean)
• precip_sd
• Wind #1 speed maximum gust(wind1_spd_max_gust)
• Precipitation minimum(precip_min)
• logger_temp
• Relative humidity mean(relh_mean)
• Relative humidity maximum(relh_max)
• wind2_spd_sd
• Wind #2 direction vector average(wind2_dir_vec_avg)
• base_time
• Relative humidity minimum(relh_min)
• wind1_dir_sd

• Precipitation mean(precip_mean)
• Wind #2 direction vector average(wind2_dir_vec_avg)
• wind2_spd_sd
• Wind #2 speed maximum gust(wind2_spd_max_gust)
• Wind #2 speed vector average(wind2_spd_vec_avg)
• temp_sd
• Wind #1 direction vector average(wind1_dir_vec_avg)
• precip_sd
• time_offset
• Temperature maximum(temp_max)
• internal_voltage
• Wind #2 speed minimum(wind2_spd_min)
• Barometric Pressure(atmos_pressure)
• vappress_sd
• Relative humidity minimum(relh_min)
• Wind #2 speed arithmetic average(wind2_spd_arith_avg)
• lat
• Wind #1 speed arithmetic average(wind1_spd_arith_avg)
• Precipitation minimum(precip_min)
• Temperature minimum(temp_min)
• Wind #2 speed maximum(wind2_spd_max)
• alt
• bit_data
• wind1_spd_sd
• logger_temp
• wind1_dir_sd
• base_time
• relh_sd
• Wind #1 speed vector average(wind1_spd_vec_avg)
• Relative humidity mean(relh_mean)
• Wind #1 speed maximum gust(wind1_spd_max_gust)
• Relative humidity maximum(relh_max)
• Wind #1 speed minimum(wind1_spd_min)
• lon
• Precipitation maximum(precip_max)
• wind2_dir_sd
• Mean Air Temperature or Hardware Error(temp_mean)
• Wind #1 speed maximum(wind1_spd_max)
• Vapor pressure mean(vappress_mean)
• external_voltage

TWP/SMET/C1 - Reprocess: Lower Wind Speed incorrect

The lower wind speed sensor (sensor #2) was reporting values 10 times above the actual 
value.  During an update to the logger configuration file the calibration multiplier was 
incorrectly entered.  The multiplier inserted was .97630 when it should have been .09763.  
This caused the readings from this sensor to be incorrect.

• lo_spd_max
• lo_spd_vec_avg
• lo_spd_arith_avg
• lo_spd_min
• lo_spd_sd

• Wind #2 speed arithmetic average(wind2_spd_arith_avg)
• wind2_spd_sd
• Wind #2 speed maximum(wind2_spd_max)
• Wind #2 speed maximum gust(wind2_spd_max_gust)
• Wind #2 speed minimum(wind2_spd_min)
• Wind #2 speed vector average(wind2_spd_vec_avg)

TWP/SMET/C1 - 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.  New loggers were installed 03/09/2004 @ 2243 GMT.

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

TWP/SMET/C1 - 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/C1 - Reprocess: Tipping bucket rain gauge added

A tipping bucket rain gauge was added to the TWP.C1 SMET suite of instruments on 20061017. 
 Effective 20060926, two new variables (count and rain amount) were added to the end of 
the twpsmet60sC1.b1 datastream.  Between 9/26 and 10/17, 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 19961009-20060926 and data from 
19961009-20061017 will be filled with -9999 (missing).

• base_time

TWP/SMET/C1 - 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_max
• lo_spd_vec_avg
• up_spd_max
• lo_spd_arith_avg
• lo_spd_min
• up_spd_sd
• up_spd_arith_avg
• up_spd_vec_avg
• up_spd_min
• lo_spd_sd