RISMA Data Updates

V2.20140414: Applied April 14, 2014

Updates: The automated QC protocol has been adjusted and the soil moisture flags modified.

These updates apply to all RISMA data (June 2013 to current) downloaded between February 14, 2014, and the application date of the next data version.

Meteorological data: The known bad data between June 2013 and November 2013 has been removed. Also new to this version is that the precipitation data will be removed and reported as “NoData” when the air temperature is below freezing point.

Soil Moisture QC Flags:
“Flag1,Flag2,Flag3,Flag4,Flag5,Flag6”
The flags will be OK, NA or an error message. Here are the possible outputs for each Flag:
Flag 1               Output: “OK” / “Out of WFV range” / “NA”
Flag 2               Output: “OK” / “Out of WFV average range” / “NA”
Flag 3               Output: “OK” / “Frozen soil” / warning: “STC averaged using depth 1 & 2” / “NA”
Flag 4               Output: “OK” / “Out of RDC range” / “NA”
Flag 5               Output: “OK” / “DLT >= 1.5” / “NA”
Flag 6               Output: “OK” / “CON >= 0.2” / “NA”

Flag 1 “Out of WFV range”: activated if the Soil Moisture (m3/m3) is less than 0.02 or greater than 0.60

Flag 2 “Out of WFV average range”: activated if the Soil Moisture value (m3/m3) is more than 10% different from the average, ie if there are sudden changes in soil moisture due to rain events or data noise.

Flag 3 “Frozen soil”: activated if the soil temperature is below zero degrees Celsius and indicates that the soil moisture readings should not be used.

Flag 3 “STC averaged using depth 1 & 2”: activated when hydra probe sensor #3 does not measure soil temperature. The average soil temperature from sensor #1 and 2 is used instead. Occurs at some ON stations.

Flag 4 “Out of RDC range”: activated when Real Dielectric Permittivity (RDC) is less than 2.4.

Flag 5 “DLT >= 1.5”: activated when the Dielectric Loss Tangent (DLT = Imaginary Dielectric Permittivity / Real Dielectric Permittivity) is equal to or larger than 1.5.

Flag 6 “CON >= 0.2”: activated when temperature corrected soil conductivity (CON) is equal to or larger than 0.2 S/m.

The hydra probe data is removed if real dielectric permittivity (RDC), conductivity (Con) or dielectric loss tangent is negative as it indicates a malfunctioning sensor.


V1.20130617: Applied June 27, 2013

Original QC Flags:
“Flag1,Flag2,Flag3,Flag4,Flag5 ”

The flags will be OK, NA or an error message. Here are the possible outputs for each Flag:

Flag 1               Output: “OK” / “Out of WFV range” / “NA”
Flag 2               Output: “OK” / “Frozen soil” / “NA”
Flag 3               Output: “OK” / “Out of average range” / “NA”
Flag 4               Output: “OK” / “Readings below zero” / “NA”
Flag 5               Output: “OK” / “DLT > 2” / “NA”

Flag 1 “Out of WFV range”: activated if Soil Moisture (m3/m3) is less than 0 or greater than 0.60

Flag 2 “Frozen soil”: activated if the soil temperature is below zero degrees Celsius and indicates that the soil moisture readings should not be used.

Flag 3 “Out of WFV average range”: activated if Soil Moisture value (m3/m3) is more than 10% different from the average, ie if there are sudden changes in soil moisture due to rain events or data noise.

Flag 4 “Readings below zero”: activated if Real Dielectric Permittivity (RDC) or Temperature Corrected Soil Conductivity (CON) is negative.

Flag 5 “DLT > 2”: activated if the Dielectric Loss Tangent (DLT = Imaginary Dielectric Permittivity / Real Dielectric Permittivity) is greater than 2.