| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 01/07/2011 | 0000 | 02/24/2016 | 2359 | Does not affect quality |
| Subject: | SGP/AERI/C1 - Radiance contaminated from optical trailer air |
| DataStreams: | sgpaerich1C1.a2, sgpaerich2C1.a2, sgpaeriC1.00, sgpaerisummaryC1.a1, sgpaeriengineerC1.b1, sgpaerisummaryC1.a2, sgpaerich2C1.a1, sgpaerich2C1.b1, sgpaerirawC1.00, sgpaerich1C1.b1, sgpaerisummaryC1.b1, sgpaerich1C1.a1 |
| Description: | Under certain conditions, the observed atmospheric radiance at the lowest level (near the surface) is contaminated by air from inside the optical trailer. This is a result of an inadequate seal between the AERI front-end (outside) and back-end (inside the optical trailer), which let inside air penetrate into the first ~1 m of the AERI optical path. This primarily affects the 540-700 cm-1 region, and retrievals and temperature and water vapor. The result is an artifact in the amplitude of the atmospheric radiance that closely mirrors the temperature fluctuations inside the optical trailer, specifically oscillations with a period of 10-15 mins. |
| Suggestions: | Correlation between the inside and outside air masses can be used to identify the conditions where the observed radiance may be contaminated. Specifically, coolerExpanderTemp and atmosphericRelativeHumidity are good proxies for the inside and outside air masses respectively. A high correlation suggests a higher probability that the observed radiance is contaminated, and thus also correlated with coolerExpanderTemp. If data are averaged for periods greater than 30 mins, then the oscillation artifact will not appear, although certain other biases may arise. A formal data quality product identifying all occurrences of this problem is under development by the mentor team. Correlation between the inside and outside air masses can be used to identify the con ditions where the observed radiance may be contaminated. Specifically, coolerExpanderTemp and atmosphericRelativeHumidity are good proxies for the inside and outside air masses respectively. A high correlation suggests a higher probability that the observed radiance is contaminated, and thus also correlated with coolerExpanderTemp. If data are averaged for periods greater than 30 mins, then the oscillation artifact will not appear, although certain other biases may arise. A formal data quality product identifying all occurrences of this problem is under development by the mentor team. Correlation between the inside and outside air masses can be used to identify the c onditions where the observed radiance may be contaminated. Specifically, coolerExpanderTemp and atmosphericRelativeHumidity are good proxies for the inside and outside air masses respectively. A high correlation suggests a higher probability that the observed radiance is contaminated, and thus also correlated with coolerExpanderTemp. If data are averaged for periods greater than 30 mins, then the oscillation artifact will not appear, although certain other biases may arise. A formal data quality product identifying all occurrences of this problem is under development by the mentor team. |
| Measurements: | sgpaerirawC1.00: more
sgpaerisummaryC1.a1: more sgpaeriC1.00: more sgpaerisummaryC1.b1: more sgpaerich1C1.b1: more sgpaerich1C1.a1: more sgpaerisummaryC1.a2: more sgpaerich2C1.b1: more sgpaerich1C1.a2: more sgpaeriengineerC1.b1: more sgpaerich2C1.a2: more sgpaerich2C1.a1: more |