ISSN:
1420-9136
Keywords:
Atmospheric ozone
;
Filter instrument intercomparison
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
,
Physics
Notes:
Abstract A commercial version of the prototype New Zealand narrowband interference filter instrument has been run at Garmisch-Partenkirchen since autumn 1977. The vicinity of the Dobson stations Hohenpeissenberg and Arosa permitted a check of the filter instrument's utility, reliability and long-term stability in total ozone measurement by (i) station to station-or ‘short-range’ intercomparisons of daily means and (ii) a several days' direct intercomparison at Arosa in spring 1978. The regression analysis with the Hohenpeissenberg data-covering the five month autumn-winter 1977/78 period with highly variable ozone-shows that the filter instrument's direct-sun modeX AD total ozone values were systematically too low by a conversion factor of 0.93. The excellent proportionality between the instruments is indicated by the standard deviation of only 1,3%. The (−7.0±1.3%) bias perfectly agrees with the result reported byBasher [1] for a similar, yet direct, intercomparison. During the direct Arosa intercomparison the filter instrument also tracked down short-time variations in a remarkable, though biased, parallelism with the Dobson instruments, and theX AD daily means fit well into the ‘prognostic’ relationship derived from the preceding autumn-winter ‘short-range’ intercomparison. A creeping deterioration of the characteristics of the 305.5 nm ‘double filter’ then prevented any furtherX AD total ozone intercomparison. No final decision is possible whether this behaviour after a half year's run is typical or just an unusual exception. The otherwise excellent long-term stability is demonstrated by the comparison of theX CD daily means with the HohenpeissenbergX AD data for a 1 1/2 year's period (autumn 1977–spring 1979), resulting in the same bias relationship as for theX AD total ozone measurements.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01593036
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