SGP/EBBR/E25 - Bowen Ratio Usually Negative - Fluxes Incorrect

Submitted By:                         _x_  Instrument Mentor
                                      ___  EST Member
                                      ___  Science Team Member
                                      ___  Other

Platform/Measurement: EBBR/Bowen ratio, sensible and latent heat fluxes
	What level data: (raw,a0,a1,b1,c1 etc): a1 (15 and 30 minute)

  What location was the data collected at: E25, Seminole, OK

  Period of time in question (Times vary for different days)

 	Begin Date 10/22/97  and on

Discussion of Problem:

Bowen ratio is normally negative, as if it is somehow being biased.
Latent and sensible heat fluxes are apparently incorrect much of the
time, especially during the daytime.  All supporting measurements seem
to be incorrect; therefore the error must be occurring in the measured
T and RH gradients.  This situation has occured since the EBBR unit was
installed on 22 October 1997.  A work request has been submitted for a
full six month check to be performed on the system.  Hopefully the checks
will point to the source of the problem.

The right relative humidity was biased.  The right T/RH probe was
replaced on 4/22/98 at 1700 GMT, but it had a more defective RH sensor
in it, causing right RH to sit at 112-114 percent.  This probe was
itself replaced on 5/6/98 at 1645 GMT, thereby taking care of the negative
Bowen ratio problem.

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• Top relative humidity (fractional)(rh_top_fraction)
• Top vapor pressure(vapor_pressure_top)
• Bottom vapor pressure(vapor_pressure_bottom)
• Bottom relative humidity (fractional)(rh_bottom_fraction)

• Right relative humidity (mV)(rh_right_mv)

• Surface latent heat flux(latent_heat_flux)
• Bowen ratio(bowen_ratio)
• Bottom vapor pressure(vapor_pressure_bottom)
• Bottom relative humidity (fractional)(rh_bottom_fraction)
• Top vapor pressure(vapor_pressure_top)
• Surface sensible heat flux(sensible_heat_flux)
• Top relative humidity (fractional)(rh_top_fraction)