AWR/AOSMET/M1 -  Reprocessed and Corrected: Wind direction offset by 19 degrees

DATA REPROCESSED and CORRECTED: 

The wind direction sensor was not installed to true north. GPS calculation confirmed the 
wind direction was off by 19 degrees, in the positive. The AOSMET data were reprocessed to 
correct the wind direction.

The data were archived in September 2016. Please retrieve the reprocessed data for use in 
your analysis.

You may find these data using the ARM Discovery tool at the following link:
http://www.archive.arm.gov/discovery/#v/results/s/finst::aosmet/fsite::awr/ffac::awr.M1

ORIGINAL DQR CATEGORY: Red( Incorrect)

REPROCESSED and CORRECTED DATA ARCHIVED:2016-09

REPROCESS IDENTIFICATION NUMBER: RID 1431

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--- ORIGINAL DQR DESCRIPTION ---
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The wind direction sensor was not installed to true north. GPS calculation confirmed the 
wind direction was off by 19 degrees, in the positive. The sensor was aligned to true 
north on 2015-12-23. Prior data will be reprocessed by subtracting 19 degrees from wind 
direction.

• Wind direction, relative to true North(WindDirection)

AWR/AOSMET/M1 - Installation period

During this installation period, there were problems with the data messages being sent 
from the sensor. Some data are missing, and available data experience occasional dropouts.

• Ambient air temperature(T_Ambient)
• heater_temp
• ref_volts
• Wind direction, relative to true North(WindDirection)
• Ambient pressure(P_Ambient)
• heater_volts
• Rain amount(rain_amount)
• Wind speed(WindSpeed)
• Ambient air relative humidity(RH_Ambient)
• Rain Duration(rain_duration)
• Rain intensity(rain_intensity)

AWR/AOSMET/M1 - Poor sensitivity to snow

The sensor plate that detects precipitation impact is not sensitive enough to detect snow 
(especially light snow). During the AWR deployment, all precipitation measurements from 
the AOSMETM1 data streams should be carefully considered and compared with colocated 
precipitation measurements.

• Rain amount(rain_amount)
• Rain Duration(rain_duration)
• Rain intensity(rain_intensity)

AWR/AOSMET/M1 - Icing event

Significant icing was noted during this time. For most of the period, wind data are 
missing due to ice buildup on the sensor. Available data for temperature, humidity, pressure, 
precipitation, and winds during this time should not be used.

• Ambient air temperature(T_Ambient)
• Wind direction, relative to true North(WindDirection)
• Ambient pressure(P_Ambient)
• Rain amount(rain_amount)
• Wind speed(WindSpeed)
• Ambient air relative humidity(RH_Ambient)
• Rain Duration(rain_duration)
• Rain intensity(rain_intensity)

AWR/AOSMET/M1 - Loose cable

A loose cable caused an instrument communication failure during these times. All data are 
missing.

• Ambient air temperature(T_Ambient)
• supply_volts
• heater_temp
• ref_volts
• Wind direction, relative to true North(WindDirection)
• Ambient pressure(P_Ambient)
• heater_volts
• Rain amount(rain_amount)
• Wind speed(WindSpeed)
• Ambient air relative humidity(RH_Ambient)
• Rain Duration(rain_duration)
• Rain intensity(rain_intensity)

AWR/AOSMET/M1 - Heavy frost on wind sensor

A period of heavy frost on the wind transducers prevented wind data from being recorded.

• Wind direction, relative to true North(WindDirection)
• Wind speed(WindSpeed)

AWR/AOSMET/M1 - Frost on wind sensor

A frost event affected the functionality of the wind sensor during this time. Data are 
missing or questionable.

• Horizontal wind speed(wind_speed)
• Horizontal wind direction(wind_direction)
• Wind direction, relative to true North(WindDirection)
• Wind speed(WindSpeed)

AWR/AOSMET/M1 - Missing wind data

Wind speed and direction data are missing intermittently, likely due to precipitation 
interference.

• Horizontal wind speed(wind_speed)
• Horizontal wind direction(wind_direction)
• Wind direction, relative to true North(WindDirection)
• Wind speed(WindSpeed)

AWR/AOSMET/M1 - Loose data cable

A loose data cable caused missing data during this time.

• Ambient pressure(pressure_ambient)
• North latitude(lat)
• time_offset
• supply_volts
• heater_temp
• ref_volts
• time
• Ambient pressure(P_Ambient)
• Wind speed(WindSpeed)
• Rain Duration(rain_duration)
• Rain intensity(rain_intensity)
• Altitude above mean sea level(alt)
• Horizontal wind speed(wind_speed)
• Horizontal wind direction(wind_direction)
• Ambient air temperature(T_Ambient)
• Wind direction, relative to true North(WindDirection)
• Ambient air relative humidity(rh_ambient)
• Ambient air temperature(temperature_ambient)
• heater_volts
• Rain amount(rain_amount)
• Ambient air relative humidity(RH_Ambient)
• East longitude(lon)
• base_time

AWR/AOSMET/M1 - Intermittent wind data due to ice fog

An ice fog event caused wind speed and direction data to be intermittently missing during 
this time. Data that are available may not be accurate.

• Horizontal wind speed(wind_speed)
• Horizontal wind direction(wind_direction)
• Wind direction, relative to true North(WindDirection)
• Wind speed(WindSpeed)