Reduction stage data loss...
...associated with chromatograms being incorrectly
timestamped.
Extended periods of downtime due to system malfunction, power outage,
or routine maintenance often led to system clock errors. Wildy anomalous
clock errors were usually detected right away, but sometimes a field
technician would mistakenly reset the clock with the wrong date (e.g. off
by a day or even a month) or the wrong time (e.g. local instead of GMT)
or both. This type of clock error might continue anywhere from a few
hours to several weeks before being discovered by a field technician, and
it would lead to a segment of time-shifted data bounded by a data gap at
one end and a time fold (region of overlapping chromatograms) at the
other end. Not only would the data be shifted to the wrong place when
processed into the areas/heights database, but data loss due to
overwriting would occur at the time folded end. Many such episodes
occurred and have been corrected.
|
Disclaimer
Privacy Notice
|
Climate Monitoring & Diagnostics Laboratory
Halocarbons & other Atmospheric Trace Species
325 Broadway R/CMDL1
Boulder, CO 80305
|
|
