Subject: | PYE/MWRP/M1 - Bias in Ground Relative Humidity Measurement |
DataStreams: | pyemwrpM1.00, pyemwrpM1.b1
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Description: | On June 17 2005, the MWRP was re-installed at PYE after the Super Blower was replaced by
the old style dew blower. The relative humidity ground sensor in the dew blower is not as
accurate. This resulted in a negative relative humidity bias of about 5.9 %. In other
words the MWRP sensor was underestimating the relative humidity. The bias was determined by
comparing MWRP measurements with SMET and radiosonde measurements. The MP.cfg file for
the MWRP was changed to reflect this bias on 09/02/2005 and will take effect on 09/03/2005
0000 GMT |
Suggestions: | Data users can simply add a value of 5.9 (in % units) to the ground relative humidity
variable when using data collected between 06/07 and 09/03. Changes in the vapor
density should be negligeable. |
Measurements: | pyemwrpM1.00: - Raw data stream - documentation not supported
more
pyemwrpM1.b1: - surfaceRelativeHumidity
- surfaceWaterVaporDensity
more
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