Non-coincident inter-instrument comparisons of ozone measurements using quasi-conservative coordinates

[摘要] Ozone measurements from ozonesondes, AROTAL, DIAL, and POAM IIIinstruments during the SOLVE-2/VINTERSOL period are composited in atime-varying, flow-following quasi-conservative (PV-θ)coordinate space; the resulting composites from each instrument aremapped onto the other instruments' locations and times.The mappeddata are then used to intercompare data from the different instruments.Overall, the four ozone data sets are found to be in good agreement.AROTALshows somewhat lower values below 16 km, and DIAL has a positive biasat the upper limits of its altitude range.These intercomparisons areconsistent with those obtained from more conventional near-coincidentprofiles, where available. Although the PV-θ mapping techniqueentails larger uncertainties of individual profile differencescompared to direct near-coincident comparisons, the ability to includemuch larger numbers of comparisons can make this techniqueadvantageous.

[学科分类] 大气科学