DQRID : D020117.14
Start DateStart TimeEnd DateEnd Time
05/21/2001094505/21/20011331
05/05/2001173005/06/20010401
05/06/2001201505/07/20010831
05/19/2001133005/19/20012301
05/27/2001093005/27/20011431
06/15/2001090006/15/20011131
05/24/2001033005/24/20011431
05/20/2001011505/20/20010231
06/21/2001110006/21/20011401
06/02/2001114506/02/20011231
06/19/2001121506/19/20011331
05/12/2001181505/13/20010130
05/03/2001110005/03/20011901
05/07/2001104505/09/20010301
05/04/2001160005/04/20011631
06/21/2001150006/21/20011531
05/01/2001011505/01/20010231
05/01/2001041505/02/20011301
05/22/2001013005/22/20011531
05/22/2001170005/22/20011701
05/21/2001033005/21/20010801
05/21/2001150005/21/20011931
06/20/2001044506/20/20010701
05/22/2001183005/23/20012001
more
Subject:
SGP/EBBR/E2 - Reprocess: E2 EBBR Soil Temperature #2 Incorrect
DataStreams:sgp30ebbrE2.b1, sgp15ebbrE2.b1
Description:
Soil Temperature #2 was intermittently incorrect.
The cause is unknown.

The indicated measurements that are calculated using 
soil temperature are also incorrect.

Soil moisture #2 (30 minute only) was also affected 
because version 6 of the EBBR datalogger program 
uses a multiplication of soil temperature and soil 
moisture as part of the adjustment of soil moisture for
soil temperature.  This was discovered to be a poor 
technique soon after it was implemented, but E2 will
continue to use version 6 until a replacement EBBR
unit is available.  When soil temperature #2 is large
negative, soil moisture #2 is often twice as large
as it should be.

EBBR unit changeout dates are listed on the EBBR 
instrument web page.
Suggestions: 
Recalculate the average soil heat flow (ave_shf),
latent heat flux (e), and sensible heat flux (h) 
using only soil sets 1, 3, 4, and 5, as follows:

ave_shf = (g1 + g3 + g4 + g5)/4

e = -(q + ave_shf)/(1 + Bowen)

h = -(q + e + ave_shf)

where q is net radiation and Bowen is the Bowen ratio.
Measurements:sgp30ebbrE2.b1:
  • Soil moisture 2, gravimetric(soil_moisture_2)
  • Surface soil heat flux 2(surface_soil_heat_flux_2)
  • Change in energy storage 2, 0-5 cm soil layer(energy_storage_change_2)
  • Soil temperature 2(soil_temp_2)
  • Surface latent heat flux(latent_heat_flux)
  • Surface soil heat flux, average of fluxes 1-5(surface_soil_heat_flux_avg)
  • Surface sensible heat flux(sensible_heat_flux)
more
sgp15ebbrE2.b1:
  • Soil temperature 2 (resistance ratio)(soil_temp_2_rr)
more

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