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000852462 1001_ $$0P:(DE-HGF)0$$aFilges, Annette$$b0$$eCorresponding author
000852462 245__ $$aEvaluation of the IAGOS-Core GHG package H$_{2}$O measurements during the DENCHAR airborne inter-comparison campaign in 2011
000852462 260__ $$aKatlenburg-Lindau$$bCopernicus$$c2018
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000852462 520__ $$aAs part of the DENCHAR (Development and Evaluation of Novel Compact Hygrometer for Airborne Research) inter-comparison campaign in northern Germany in 2011, a commercial cavity ring-down spectroscopy (CRDS) based gas analyzer (G2401-m, Picarro Inc., US) was installed on a Learjet to measure atmospheric water vapor, CO2, CH4, and CO. The CRDS components were identical to those chosen for integration aboard commercial airliners within the IAGOS (In-service Aircraft for a Global Observing System) project. Since the quantitative capabilities of the CRDS water vapor measurements were never evaluated and reviewed in detail in a publication before, the campaign allowed for an initial assessment of the long-term IAGOS water vapor measurements by CRDS against reference instruments with a long performance record (Fast In-situ Stratospheric Hygrometer (FISH) and CR-2 frost point hygrometer (Buck Research Instruments L.L.C., US), both operated by Research Centre Jülich).For the initial water calibration of the instrument it was compared against a dew point mirror (Dewmet TDH, Michell Instruments Ltd., UK) in the range from 70000 to 25000ppm water vapor mole fraction. During the inter-comparison campaign the analyzer was compared on the ground over the range from 2 to 600ppm against the dew point hygrometer used for calibration of the FISH reference instrument. A new, independent calibration method based on the dilution effect of water vapor on CO2 was evaluated.Comparison of the in-flight data against the reference instruments showed that the analyzer is reliable and has a good long-term stability. The flight data suggest a conservative precision estimate for measurements made at 0.4Hz (2.5s measurement interval) of 4ppm for H2O<10ppm, 20% or 10ppm (whichever is smaller) for 10ppm<H2O<100ppm, and 5% or 30ppm (whichever is smaller) for H2O>100ppm. Accuracy of the CRDS instrument was estimated, based on laboratory calibrations, as 1% for the water vapor range from 25000ppm down to 7000ppm, increasing to 5% at 50ppm water vapor. Accuracy at water vapor mole fractions below 50ppm was difficult to assess, as the reference systems suffered from lack of data availability.
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000852462 7001_ $$00000-0002-1112-8603$$aGerbig, Christoph$$b1
000852462 7001_ $$0P:(DE-HGF)0$$aRella, Chris W.$$b2
000852462 7001_ $$0P:(DE-HGF)0$$aHoffnagle, John$$b3
000852462 7001_ $$0P:(DE-HGF)0$$aSmit, Herman$$b4
000852462 7001_ $$0P:(DE-Juel1)129131$$aKrämer, Martina$$b5
000852462 7001_ $$0P:(DE-Juel1)129155$$aSpelten, Nicole$$b6$$ufzj
000852462 7001_ $$0P:(DE-Juel1)139013$$aRolf, Christian$$b7
000852462 7001_ $$0P:(DE-HGF)0$$aBozóki, Zoltán$$b8
000852462 7001_ $$0P:(DE-HGF)0$$aBuchholz, Bernhard$$b9
000852462 7001_ $$00000-0002-1394-3097$$aEbert, Volker$$b10
000852462 773__ $$0PERI:(DE-600)2505596-3$$a10.5194/amt-11-5279-2018$$gVol. 11, no. 9, p. 5279 - 5297$$n9$$p5279 - 5297$$tAtmospheric measurement techniques$$v11$$x1867-8548$$y2018
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