TWP/SMET/C1 - Reprocess: Skewed wind direction 1 data

Wind direction 1 data is incorrect. 
Manus SMET wind direction for Wind-1 (upper unit) was apparently skewed
from its original position as a result of checking direction calibration. 

As near as we can tell the position of the sensor was rotated clockwise
Somewhere in the range of 45-90 degrees, most likely in steps 22.5 degrees.

Data comparison performed on 3-2-00, using a small amount of data from 
this instrument.

• Wind #1 direction standard deviation(wind1_dir_sd)
• Wind #1 direction vector average(wind1_dir_vec_avg)
• Wind #1 speed vector average(wind1_spd_vec_avg)

• Raw data stream - documentation not supported(Raw data stream - documentation not supported)

• Wind #1 direction vector average(wind1_dir_vec_avg)
• Wind #1 speed vector average(wind1_spd_vec_avg)
• Wind #1 direction standard deviation(wind1_dir_sd)

TWP/SMET/C1 - Wind Direction alignment method

During RESET10 we discovered a problem with wind direction from WIND1 (upper
anemometer).  During RESET8, WIND1 was corrected by rotating the alignment
ring instead of the anemometer.  This resulted in a better agreement between
the 2 anemometers, but is not the correct way to align an anemometer. The
alignment ring was readjusted for true north and the anemometer reset in
the proper slot (the original problem).

• Wind #1 direction standard deviation(wind1_dir_sd)
• Wind #1 direction vector average(wind1_dir_vec_avg)
• Wind #1 speed vector average(wind1_spd_vec_avg)

• Raw data stream - documentation not supported(Raw data stream - documentation not supported)

• Wind #1 direction vector average(wind1_dir_vec_avg)
• Wind #1 speed vector average(wind1_spd_vec_avg)
• Wind #1 direction standard deviation(wind1_dir_sd)

TWP/SMET/C1 - Incorrect calibration for ARCS1 Wind speed

On 23 OCT 99, during Reset 8, an incorrect slope of was entered for the 
upper, windspeed1, wind speed sensor resulting in a 1% overestimate of
the wind speed.  The correct calibration was entered on 1 APR 2000 during
RESET 10.

• Wind #1 speed standard deviation(wind1_spd_sd)
• Wind #1 speed arithmetic average(wind1_spd_arith_avg)
• Wind #1 speed maximum(wind1_spd_max)
• Wind #1 speed maximum gust(wind1_spd_max_gust)
• Wind #1 speed minimum(wind1_spd_min)
• Wind #1 speed vector average(wind1_spd_vec_avg)

• Raw data stream - documentation not supported(Raw data stream - documentation not supported)

• Raw data stream - documentation not supported(Raw data stream - documentation not supported)

• Wind #1 speed vector average(wind1_spd_vec_avg)
• Wind #1 speed maximum(wind1_spd_max)
• Wind #1 speed maximum gust(wind1_spd_max_gust)
• Wind #1 speed standard deviation(wind1_spd_sd)
• Wind #1 speed minimum(wind1_spd_min)
• Wind #1 speed arithmetic average(wind1_spd_arith_avg)

TWP/SMET/C1 - Elevated relative humidity

The relative humidity has been exceeding 100% with unusual regularity.
The most dramatic case occured on December 31 when the RH exceeded 100%
for 18 hours and exceeded 103.5% for 6 hours with a maximum value of
103.8%.  A PIF was submitted to propose changing this sensor. This change
occurred on August 12, 1999.

• Relative humidity minimum(relh_min)
• Std Dev of Relative Humidity or Hardware Error Code(relh_sd)
• Relative humidity mean(relh_mean)
• Relative humidity maximum(relh_max)

• Relative humidity minimum(relh_min)
• Relative humidity maximum(relh_max)
• Std Dev of Relative Humidity or Hardware Error Code(relh_sd)
• Relative humidity mean(relh_mean)

TWP/SMET/C1 - C1 TWP  Wind speed calibration factor problem/ Wind1

Wind speed calibration factors were reversed between wind speed sensor 1 and 2.
Results in less than 1% error, but correction factors may be used.

• Wind #1 speed standard deviation(wind1_spd_sd)
• Wind #1 speed maximum gust(wind1_spd_max_gust)
• Wind #1 speed arithmetic average(wind1_spd_arith_avg)
• Wind #1 speed maximum(wind1_spd_max)
• Wind #1 speed vector average(wind1_spd_vec_avg)
• Wind #1 speed minimum(wind1_spd_min)

• Wind #1 speed maximum gust(wind1_spd_max_gust)
• Wind #1 speed standard deviation(wind1_spd_sd)
• Wind #1 speed vector average(wind1_spd_vec_avg)
• Wind #1 speed maximum(wind1_spd_max)
• Wind #1 speed minimum(wind1_spd_min)
• Wind #1 speed arithmetic average(wind1_spd_arith_avg)

TWP/SMET/C1 - C1 SMET Incorrect wind speed calibration factors

Wind speed calibration factors were reversed between wind speed sensors 1 and 2.  Error 
results in less than a 1% error in wind speed.  A correction factor may be used.

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

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

TWP/C1 - Incorrect elevation reported in Manus Data

(From Bill Clements) We have been using 6m MSL as the station
elevation of Momote (Manus).  This was based on information
posted near the station barometer in the Momote Weather Service
Office.  It turns out that the official WMO station elevation
for Momote is 4m MSL and the upper air elevation is 5m MSL.

All Manus instruments except the sonde station are at 4m MSL.
The sonde launching station is at 5m MSL.

• altitude above sea levelaltunits(alt)

• altitude above sea levelaltunits(alt)

• altitude above sea levelaltunits(alt)

• altitude above sea levelaltunits(alt)

• altitude above sea levelaltunits(alt)

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 mean(precip_mean)
• Precipitation maximum(precip_max)
• Precipitation standard deviation(precip_sd)
• precipitation minimum(precip_min)

Calibration interruption at TWP Nauru

Occasional calibration interuption occured while calibration SMET instruments

• Internal voltage(internal_voltage)
• Time offset from base_time(base_time)
• Wind #2 speed standard deviation(wind2_spd_sd)
• Logger panel temperature(logger_temp)
• east longitude for all the input platforms.(lon)
• External voltage(external_voltage)
• Std Dev of Relative Humidity or Hardware Error Code(relh_sd)
• north latitude for all the input platforms.(lat)
• Max Temperature at lowest Model Level- 1 hr(temp_max)
• Precipitation mean(precip_mean)
• Temperature standard deviation(temp_sd)
• precipitation minimum(precip_min)
• Relative humidity maximum(relh_max)
• Time offset of tweaks from base_time(time_offset)
• Precipitation maximum(precip_max)
• Bit data. See details.(bit_data)
• Wind #2 direction standard deviation(wind2_dir_sd)
• Wind #1 speed standard deviation(wind1_spd_sd)
• altitude above sea levelaltunits(alt)
• Vapor pressure mean(vappress_mean)
• Wind #1 speed arithmetic average(wind1_spd_arith_avg)
• Wind #2 speed vector average(wind2_spd_vec_avg)
• Wind #2 speed minimum(wind2_spd_min)
• Precipitation standard deviation(precip_sd)
• GPS raw data filename(filename)
• Wind #1 direction vector average(wind1_dir_vec_avg)
• Wind #2 speed maximum gust(wind2_spd_max_gust)
• Wind #2 speed maximum(wind2_spd_max)
• Atmospheric pressure(atmos_pressure)
• Relative humidity minimum(relh_min)
• Wind #1 speed maximum(wind1_spd_max)
• Vapor pressure standard deviation(vappress_sd)
• Relative humidity mean(relh_mean)
• Mean Air Temperature or Hardware Error(temp_mean)
• Wind #1 speed maximum gust(wind1_spd_max_gust)
• Wind #1 direction standard deviation(wind1_dir_sd)
• Wind #2 speed arithmetic average(wind2_spd_arith_avg)
• Min Temperature at lowest Model Level- 1 hr(temp_min)
• Wind #2 direction vector average(wind2_dir_vec_avg)
• Wind #1 speed vector average(wind1_spd_vec_avg)
• Wind #1 speed minimum(wind1_spd_min)

• Raw data stream - documentation not supported(Raw data stream - documentation not supported)

• Wind #1 speed vector average(wind1_spd_vec_avg)
• Precipitation maximum(precip_max)
• Wind #1 direction standard deviation(wind1_dir_sd)
• Mean Air Temperature or Hardware Error(temp_mean)
• altitude above sea levelaltunits(alt)
• Max Temperature at lowest Model Level- 1 hr(temp_max)
• Wind #2 speed vector average(wind2_spd_vec_avg)
• Wind #1 speed maximum(wind1_spd_max)
• Wind #1 speed maximum gust(wind1_spd_max_gust)
• Wind #2 direction standard deviation(wind2_dir_sd)
• Wind #1 speed standard deviation(wind1_spd_sd)
• Relative humidity minimum(relh_min)
• Std Dev of Relative Humidity or Hardware Error Code(relh_sd)
• Wind #1 speed minimum(wind1_spd_min)
• GPS raw data filename(filename)
• Logger panel temperature(logger_temp)
• Bit data. See details.(bit_data)
• Precipitation mean(precip_mean)
• Time offset from base_time(base_time)
• Min Temperature at lowest Model Level- 1 hr(temp_min)
• Vapor pressure standard deviation(vappress_sd)
• Wind #2 speed maximum(wind2_spd_max)
• Atmospheric pressure(atmos_pressure)
• Time offset of tweaks from base_time(time_offset)
• Wind #1 direction vector average(wind1_dir_vec_avg)
• Wind #2 speed maximum gust(wind2_spd_max_gust)
• Precipitation standard deviation(precip_sd)
• Wind #1 speed arithmetic average(wind1_spd_arith_avg)
• Wind #2 speed minimum(wind2_spd_min)
• precipitation minimum(precip_min)
• Relative humidity maximum(relh_max)
• Vapor pressure mean(vappress_mean)
• Relative humidity mean(relh_mean)
• east longitude for all the input platforms.(lon)
• Temperature standard deviation(temp_sd)
• Wind #2 direction vector average(wind2_dir_vec_avg)
• Wind #2 speed arithmetic average(wind2_spd_arith_avg)
• External voltage(external_voltage)
• Internal voltage(internal_voltage)
• Wind #2 speed standard deviation(wind2_spd_sd)
• north latitude for all the input platforms.(lat)