DQRID : D941114.3
Start DateStart TimeEnd DateEnd Time Data Quality Metric
10/20/1994000011/01/19941540Incorrect
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Subject:
SGP/EBBR/E7 - Net Radiometer not level
DataStreams:sgp15ebbrE7.b1, sgp5ebbrE7.b1, sgp30ebbrE7.b1
Description:
Sometime between 0000 and 1200 GMT on October 20, 1994, the net radiometer
support of the EBBR at E7 was bent down at about a 30 degree angle, probably
by migrating birds.  A couple of DQRs have been issued by me indicating other
extended facilities at which birds have caused incorrect data from net
radiometers.  The net radiometer support was probably loose to begin with.
The effect can be easily seen in the data, when comparison is made to the
EBBR data at Ashton, KS.  Since the net radiometer support extends south
from the EBBR, the net radiation values are high during the period above,
leading to incorrect values of latent and sensible heat fluxes.  Until the
net radiometer was levelled on November 1, 1994, the net radiation was
approximately 26% high at solar noon, although it may have been incorrect
by a smaller percentage at night.  From October 22 through 28 the half hour
of data nearest solar noon averaged 497 watts per meter squared at Elk
Falls and only 396 at Ashton.  During the period listed above, the following
data are incorrect and cannot be recalculated:

5 minute:  q

15 minute: mv_q

30 minute: q, h, e

Science Team members or others using the data should recognize that the
flux data is not correct for this fairly lengthy time period.
Suggestions: 
Measurements:sgp5ebbrE7.b1:
  • net_radiation
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sgp15ebbrE7.b1:
  • net_radiation_mv
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sgp30ebbrE7.b1:
  • latent_heat_flux
  • net_radiation
  • sensible_heat_flux
more

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