| Subject: | SGP/QCRAD/E1 - Intermittently missing downwelling diffuse |
| DataStreams: | sgpqcrad1longE1.c2, sgpqcrad1longE1.s2
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| Description: | Starting on or about 10/26/2005 the downwelling diffuse hemispheric irradiance (Eppley
8-48) instrument had intermittent missing values. Technicians found a loose wire on the
instrument connector and repaired it on 4/4/2006.
This means that Best Estimate Global can't be calculated from the sum of direct and
diffuse. It also means that some quality checks can't be done.
Problem documented in instrument DQR D060331.2. |
| Suggestions: | Use MFRSR diffuse or global shortwave hemispheric (PSP) component - normal incident
component (CosZA*NIP) to calulate diffuse component. Comparison of absolute difference
between actual and computed diffuse component values and diffuse standard deviations > 1-2
W/m2 can help filter the noisy diffuse data. There is no standard method. |
| Measurements: | sgpqcrad1longE1.s2: - down_short_diffuse_hemisp
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sgpqcrad1longE1.c2: - down_short_diffuse_hemisp
more
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