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000155462 005__ 20240712100849.0
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000155462 037__ $$aFZJ-2014-04628
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000155462 1001_ $$0P:(DE-HGF)0$$aFahey, D. W. F.$$b0
000155462 245__ $$aThe AquaVIT-1 Intercomparison of Atmosheric Water Vapor Measurements Techniques
000155462 260__ $$aKatlenburg-Lindau$$bCopernicus$$c2014
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000155462 520__ $$aThe AquaVIT-1 Intercomparison of Atmospheric Water Vapor Measurement Techniques was conducted at the aerosol and cloud simulation chamber AIDA at the Karlsruhe Institute of Technology, Germany, in October 2007. The overall objective was to intercompare state-of-the-art and prototype atmospheric hygrometers with each other and with independent humidity standards under controlled conditions. This activity was conducted as a blind intercomparison with coordination by selected referees. The effort was motivated by persistent discrepancies found in atmospheric measurements involving multiple instruments operating on research aircraft and balloon platforms, particularly in the upper troposphere and lower stratosphere where water vapor reaches its lowest atmospheric values (less than 10 ppm). With the AIDA chamber volume of 84 m3, multiple instruments analyzed air with a common water vapor mixing ratio, either by extracting air into instrument flow systems, locating instruments inside the chamber, or sampling the chamber volume optically. The intercomparison was successfully conducted over 10 days during which pressure, temperature, and mixing ratio were systematically varied (50 to 500 hPa, 185 to 243 K, and 0.3 to 152 ppm). In the absence of an accepted reference instrument, the reference value was taken to be the ensemble mean of a core subset of the measurements. For these core instruments, the agreement between 10 and 150 ppm of water vapor is considered good with variation about the reference value of about ±10% (±1σ). In the region of most interest between 1 and 10 ppm, the core subset agreement is fair with variation about the reference value of ±20% (±1σ). The upper limit of precision was also derived for each instrument from the reported data. These results indicate that the core instruments, in general, have intrinsic skill to determine unknown water vapor mixing ratios with an accuracy of at least ±20%. The implication for atmospheric measurements is that the substantially larger differences observed during in-flight intercomparisons stem from other factors associated with the moving platforms or the non-laboratory environment. The success of AquaVIT-1 provides a template for future intercomparison efforts with water vapor or other species that are focused on improving the analytical quality of atmospheric measurements on moving platforms.
000155462 536__ $$0G:(DE-HGF)POF2-234$$a234 - Composition and Dynamics of the Upper Troposphere and Stratosphere (POF2-234)$$cPOF2-234$$fPOF II$$x0
000155462 7001_ $$0P:(DE-HGF)0$$aGao, R. S. G.$$b1
000155462 7001_ $$0P:(DE-HGF)0$$aMöhler, O. M.$$b2
000155462 7001_ $$0P:(DE-HGF)0$$aSaathoff, H. S.$$b3
000155462 7001_ $$0P:(DE-HGF)0$$aSchiller, C.$$b4
000155462 7001_ $$0P:(DE-HGF)0$$aEbert, V. E.$$b5
000155462 7001_ $$0P:(DE-Juel1)129131$$aKrämer, Martina$$b6$$ufzj
000155462 7001_ $$0P:(DE-HGF)0$$aPeter, T. P.$$b7
000155462 7001_ $$0P:(DE-HGF)0$$aAmarouche, N. A.$$b8
000155462 7001_ $$0P:(DE-HGF)0$$aAvallone, L. M. A.$$b9
000155462 7001_ $$0P:(DE-Juel1)139077$$aBauer, Reimar$$b10$$ufzj
000155462 7001_ $$0P:(DE-HGF)0$$aBozóki, Z. B.$$b11
000155462 7001_ $$0P:(DE-HGF)0$$aChristensen, L. E. C.$$b12
000155462 7001_ $$0P:(DE-HGF)0$$aDavis, S. M. D.$$b13
000155462 7001_ $$0P:(DE-HGF)0$$aDurry, G. D.$$b14
000155462 7001_ $$0P:(DE-HGF)0$$aDyroff, C. D.$$b15
000155462 7001_ $$0P:(DE-HGF)0$$aHerman, R. L. H.$$b16
000155462 7001_ $$0P:(DE-HGF)0$$aHunsmann, S. H.$$b17
000155462 7001_ $$0P:(DE-HGF)0$$aKhaykin, S. K.$$b18
000155462 7001_ $$0P:(DE-HGF)0$$aMackrodt, P. M.$$b19
000155462 7001_ $$0P:(DE-HGF)0$$aMeyer, J. M.$$b20
000155462 7001_ $$0P:(DE-HGF)0$$aSmith, J. B. S.$$b21
000155462 7001_ $$0P:(DE-Juel1)129155$$aSpelten, Nicole$$b22$$ufzj
000155462 7001_ $$0P:(DE-HGF)0$$aTroy, R. F. T.$$b23
000155462 7001_ $$0P:(DE-HGF)0$$aVömel, H. V.$$b24
000155462 7001_ $$0P:(DE-HGF)0$$aWagner, S. W.$$b25
000155462 7001_ $$0P:(DE-HGF)0$$aWienhold, F. G. W.$$b26
000155462 773__ $$0PERI:(DE-600)2507817-3$$p3159-3251$$tAtmospheric measurement techniques discussions$$v7$$x1867-8610$$y2014
000155462 8564_ $$uhttps://juser.fz-juelich.de/record/155462/files/FZJ-2014-04628.pdf$$yOpenAccess
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000155462 9132_ $$0G:(DE-HGF)POF3-244$$1G:(DE-HGF)POF3-240$$2G:(DE-HGF)POF3-200$$aDE-HGF$$bMarine, Küsten- und Polare Systeme$$lAtmosphäre und Klima$$vComposition and dynamics of the upper troposphere and middle atmosphere$$x0
000155462 9131_ $$0G:(DE-HGF)POF2-234$$1G:(DE-HGF)POF2-230$$2G:(DE-HGF)POF2-200$$3G:(DE-HGF)POF2$$4G:(DE-HGF)POF$$aDE-HGF$$bErde und Umwelt$$lAtmosphäre und Klima$$vComposition and Dynamics of the Upper Troposphere and Stratosphere$$x0
000155462 9141_ $$y2014
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