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/C2/SMET Temperature spike

There was a brief -4 C spike in the temperature at approximately
21.5 Z on December 3.  This spike also showed up in the vapor pressure
which is calculated from the temperature and relative humidity.

• Mean Air Temperature or Hardware Error(temp_mean)
• Temperature standard deviation(temp_sd)
• Min Temperature at lowest Model Level- 1 hr(temp_min)
• Vapor pressure standard deviation(vappress_sd)
• Max Temperature at lowest Model Level- 1 hr(temp_max)
• Vapor pressure mean(vappress_mean)

• Max Temperature at lowest Model Level- 1 hr(temp_max)
• Vapor pressure standard deviation(vappress_sd)
• Vapor pressure mean(vappress_mean)
• Mean Air Temperature or Hardware Error(temp_mean)
• Temperature standard deviation(temp_sd)
• Min Temperature at lowest Model Level- 1 hr(temp_min)

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

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)

TWP/SMET/C1 - Reprocess: Barometric Data Changed from hPa to kPa

Barometric pressure data was converted from hPa to kPa in order to standardize the 
measurement units among ARM sites and to conform to accepted standard units determined by the 
scientific community.

• Atmospheric pressure(atmos_pressure)

TWP/SMET/C2 - Reprocess: Barometric Data Changed from hPa to kPa

Barometric pressure data was converted from hPa to kPa in order to standardize the 
measurement units among ARM sites and to conform to accepted standard units determined by the 
scientific community.

• Atmospheric 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).

• Time offset from base_time(base_time)

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).

• Time offset from base_time(base_time)