SGP/AERI/B1 - Increased radiative uncertainty during hot summer afternoons

The ambient temperature of the AERI enclosures at the boundary facilities
often exceeded 308 K during hot summer afternoons.  This threshold marked
the maximum end of the "acceptable" range of temperatures that the 
ambient blackbody should maintain.  The issue is that if the hot 
blackbody and ambient blackbody temperatures are too close together, then 
the radiative calibration becomes more uncertain.  It should be noted 
that the hot blackbody's temperature is maintained at roughly 333 K.  

Using the calibration equation, an uncertainty analysis was performed
to see how much "additional" uncertainty resulted in the AERI
observations when the ambient temperature was between 308-315 K (315 K
was the maximum temperature that the ambient blackbody reached during
the summer).  The analysis compared the radiative uncertainties from the
Hillsboro (B1) AERI (chosen at random) with the AERI-01 at the SGP/CF
over a 5-year period.  Plot1 (below) shows the time-series of ambient
blackbody temperatures for the two instruments, along with histograms to
show the distribution of the temperatures.  The boundary facility
instrument did suffer from higher temperatures in the summer
time periods.  Plot2 (bleow) shows the relative radiative uncertainty
for each instrument.  The CF instrument has a maximum radiative
uncertainty of around 0.18% during the summer, while the BF instrument's
maximum radiative uncertainty is about 0.25%.  This plot demonstrates
that the radiative uncertainty is significantly larger for the BF
instrument in the summer relative to the CF instrument.  However, the
absolute radiative accuracy for the AERI is specified to be better than
1% of the ambient radiance, and both the CF and the BF AERIs are well
within this uncertainty.  

In short, there is significantly higher radiative uncertainty in the
BF AERIs during the hot summer afternoons, but the uncertainty is well
within the specified accuracy of the instrument.

plot1:  aeri_abb_temp.lamont_hillsboro.png 

plot2:  aeri_relative_error.lamont_hillsboro.png 

• Radiation, longwave, downwelling radiance, 0.5 cm-1 resolution, 3.3-5.5 um(mean_rad)

• Radiation, longwave, downwelling radiance, 0.5 cm-1 resolution, 3.3-5.5 um(mean_rad)

SGP/AERI/B5 - Increased radiative uncertainty during hot summer afternoons

The ambient temperature of the AERI enclosures at the boundary facilities
often exceeded 308 K during hot summer afternoons.  This threshold marked
the maximum end of the "acceptable" range of temperatures that the 
ambient blackbody should maintain.  The issue is that if the hot 
blackbody and ambient blackbody temperatures are too close together, then 
the radiative calibration becomes more uncertain.  It should be noted 
that the hot blackbody's temperature is maintained at roughly 333 K.  

Using the calibration equation, an uncertainty analysis was performed
to see how much "additional" uncertainty resulted in the AERI
observations when the ambient temperature was between 308-315 K (315 K
was the maximum temperature that the ambient blackbody reached during
the summer).  The analysis compared the radiative uncertainties from the
Hillsboro (B1) AERI (chosen at random) with the AERI-01 at the SGP/CF
over a 5-year period.  Plot1 (below) shows the time-series of ambient
blackbody temperatures for the two instruments, along with histograms to
show the distribution of the temperatures.  The boundary facility
instrument did suffer from higher temperatures in the summer
time periods.  Plot2 (bleow) shows the relative radiative uncertainty
for each instrument.  The CF instrument has a maximum radiative
uncertainty of around 0.18% during the summer, while the BF instrument's
maximum radiative uncertainty is about 0.25%.  This plot demonstrates
that the radiative uncertainty is significantly larger for the BF
instrument in the summer relative to the CF instrument.  However, the
absolute radiative accuracy for the AERI is specified to be better than
1% of the ambient radiance, and both the CF and the BF AERIs are well
within this uncertainty.  

In short, there is significantly higher radiative uncertainty in the
BF AERIs during the hot summer afternoons, but the uncertainty is well
within the specified accuracy of the instrument.

plot1:  aeri_abb_temp.lamont_hillsboro.png 

plot2:  aeri_relative_error.lamont_hillsboro.png 

• Radiation, longwave, downwelling radiance, 0.5 cm-1 resolution, 3.3-5.5 um(mean_rad)

• Radiation, longwave, downwelling radiance, 0.5 cm-1 resolution, 3.3-5.5 um(mean_rad)

SGP/AERI/B6 - Increased radiative uncertainty during hot summer afternoons

The ambient temperature of the AERI enclosures at the boundary facilities
often exceeded 308 K during hot summer afternoons.  This threshold marked
the maximum end of the "acceptable" range of temperatures that the 
ambient blackbody should maintain.  The issue is that if the hot 
blackbody and ambient blackbody temperatures are too close together, then 
the radiative calibration becomes more uncertain.  It should be noted 
that the hot blackbody's temperature is maintained at roughly 333 K.  

Using the calibration equation, an uncertainty analysis was performed
to see how much "additional" uncertainty resulted in the AERI
observations when the ambient temperature was between 308-315 K (315 K
was the maximum temperature that the ambient blackbody reached during
the summer).  The analysis compared the radiative uncertainties from the
Hillsboro (B1) AERI (chosen at random) with the AERI-01 at the SGP/CF
over a 5-year period.  Plot1 (below) shows the time-series of ambient
blackbody temperatures for the two instruments, along with histograms to
show the distribution of the temperatures.  The boundary facility
instrument did suffer from higher temperatures in the summer
time periods.  Plot2 (bleow) shows the relative radiative uncertainty
for each instrument.  The CF instrument has a maximum radiative
uncertainty of around 0.18% during the summer, while the BF instrument's
maximum radiative uncertainty is about 0.25%.  This plot demonstrates
that the radiative uncertainty is significantly larger for the BF
instrument in the summer relative to the CF instrument.  However, the
absolute radiative accuracy for the AERI is specified to be better than
1% of the ambient radiance, and both the CF and the BF AERIs are well
within this uncertainty.  

In short, there is significantly higher radiative uncertainty in the
BF AERIs during the hot summer afternoons, but the uncertainty is well
within the specified accuracy of the instrument.

plot1:  aeri_abb_temp.lamont_hillsboro.png 

plot2:  aeri_relative_error.lamont_hillsboro.png 

• Radiation, longwave, downwelling radiance, 0.5 cm-1 resolution, 3.3-5.5 um(mean_rad)

• Radiation, longwave, downwelling radiance, 0.5 cm-1 resolution, 3.3-5.5 um(mean_rad)

SGP/RWP/C1 - Reprocess: Instrument in non-standard mode for IOP

The SGP.C1 915RWP was operated in a non-standard mode during the Nocturnal
Flux IOP (approximately the month of September). The profiler was placed into a constant 
high temporal and spatial resolution mode rather than alternating between modes as it does 
routinely. 30 min averages were produced (usually 60 min) at a 60 m gate resolution for 
both winds and RASS. 

Data were processed and archived, but the processing algorithm interpreted this data as 2 
different power levels per hourly sample rather than 30 minute samples at the same power 
level.  Data will be reprocessed.

• snr
• mdf
• alt
• sspecw
• noise
• lat
• Temperature, virtual, profile, merged from 50 and 915 MHz RASS(virtual_temp)
• Pressure, associated geometric height, at altitude, NGM model output(height)
• base_time
• sampr
• Spectral Width(specw)
• smdf
• time_offset
• ssnr
• rgs
• lon

• range_gate
• Spectral Width(specw)
• ipp
• noise
• bswitch
• height_t
• nheight
• snr
• beam
• vsr
• plen
• lon
• tditime
• spcavetime
• vband
• ncoh
• mdf
• sampr
• nspc
• lat
• pcbits
• alt
• elevation
• time_offset
• prf
• sitime
• rgf
• base_time
• dly
• rgs
• oband
• rgl

• power
• sitime
• alt
• ncoh
• bswitch
• Wind direction, horizontal, at altitude, 915 MHz RWP(dir)
• nrec4
• nrec3
• nrec2
• nrec1
• nrec0
• elevation4
• elevation3
• elevation2
• elevation1
• elevation0
• lat
• oband
• azimuth4
• azimuth1
• azimuth0
• azimuth3
• azimuth2
• vband
• pcbits
• Beam 1 radial wind speed(vel1)
• Beam 2 radial wind speed(vel2)
• Beam 3 radial wind speed(vel3)
• nspc
• Beam 4 radial wind speed(vel4)
• Beam 0 radial wind speed(vel0)
• tditime
• plen
• sampr
• prf
• time_offset
• ipp
• ncns1
• ncns0
• ncns3
• ncns2
• ncns4
• dly
• avgint
• vvsr
• lon
• spcavetim
• ovsr
• range_gate
• nrcns3
• nrcns2
• nrcns1
• nrcns0
• height_p
• nrcns4
• Northward Wind Component(v_wind)
• Wind speed, horizontal, at altitude, 915 MHz RWP(spd)
• base_time
• rgs
• snr0
• snr2
• snr1
• snr4
• snr3
• rgf
• rgl
• nheight
• Eastward Wind Component(u_wind)

• sampr
• dly
• rgf
• nheight
• lon
• rgl
• rgs
• ncoh
• base_time
• nspc
• ipp
• oband
• lat
• prf
• beam
• alt
• bswitch
• vband
• plen
• range_gate
• time_offset
• height_t
• Backscatter, doppler spectrum, 915 MHz RWP(spc_amp)
• pcbits
• spcavetim
• sitime
• bins
• tditime
• elevation
• vsr

• lon
• avgint
• base_time
• rgs
• Wind speed, vertical velocity, at altitude, 915 MHz RWP(vert_v)
• SNR Vertical wind velocity(snr_vert_v)
• lat
• SNR Beam 0 Virtual Temperature(snr_virtual_temp)
• Temperature, virtual, profile, merged from 50 and 915 MHz RASS(virtual_temp)
• alt
• ncns_virtual_temp
• nrcns
• ncns_vert_v
• ncns_virtual_temp_corr
• SNR Corrected Beam 0 Virtual Temperature(snr_virtual_temp_corr)
• time_offset
• sampr
• Pressure, associated geometric height, at altitude, NGM model output(height)
• nrec
• Temperature, virtual, at altitude, 10-min cons. avg, corrected, 915 MHz RWP/RASS(virtual_temp_corr)

• lon
• alt
• bins
• base_time
• sampr
• time_offset
• Pressure, associated geometric height, at altitude, NGM model output(height)
• Backscatter, doppler spectrum, 915 MHz RWP(spc_amp)
• rgs
• lat