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000185605 0247_ $$2doi$$a10.1002/2013JD020817
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000185605 037__ $$aFZJ-2014-07031
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000185605 1001_ $$0P:(DE-HGF)0$$aRollins, A. W.$$b0$$eCorresponding Author
000185605 245__ $$aEvaluation of UT/LS hygrometer accuracy by intercomparison during the NASA MACPEX mission
000185605 260__ $$aHoboken, NJ$$bWiley$$c2014
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000185605 520__ $$aAcquiring accurate measurements of water vapor at the low mixing ratios (< 10 ppm) encountered in the upper troposphere and lower stratosphere (UT/LS) has proven to be a significant analytical challenge evidenced by persistent disagreements between high-precision hygrometers. These disagreements have caused uncertainties in the description of the physical processes controlling dehydration of air in the tropical tropopause layer and entry of water into the stratosphere and have hindered validation of satellite water vapor retrievals. A 2011 airborne intercomparison of a large group of in situ hygrometers onboard the NASA WB-57F high-altitude research aircraft and balloons has provided an excellent opportunity to evaluate progress in the scientific community toward improved measurement agreement. In this work we intercompare the measurements from the Midlatitude Airborne Cirrus Properties Experiment (MACPEX) and discuss the quality of agreement. Differences between values reported by the instruments were reduced in comparison to some prior campaigns but were nonnegligible and on the order of 20% (0.8 ppm). Our analysis suggests that unrecognized errors in the quantification of instrumental background for some or all of the hygrometers are a likely cause. Until these errors are understood, differences at this level will continue to somewhat limit our understanding of cirrus microphysical processes and dehydration in the tropical tropopause layer.
000185605 536__ $$0G:(DE-HGF)POF2-234$$a234 - Composition and Dynamics of the Upper Troposphere and Stratosphere (POF2-234)$$cPOF2-234$$fPOF II$$x0
000185605 7001_ $$0P:(DE-HGF)0$$aThornberry, T. D.$$b1
000185605 7001_ $$0P:(DE-HGF)0$$aGao, R. S.$$b2
000185605 7001_ $$0P:(DE-HGF)0$$aSmith, J. B.$$b3
000185605 7001_ $$0P:(DE-HGF)0$$aSayres, D. S.$$b4
000185605 7001_ $$0P:(DE-HGF)0$$aSargent, M. R.$$b5
000185605 7001_ $$0P:(DE-HGF)0$$aSchiller, C.$$b6
000185605 7001_ $$0P:(DE-Juel1)129131$$aKrämer, Martina$$b7$$ufzj
000185605 7001_ $$0P:(DE-Juel1)129155$$aSpelten, Nicole$$b8$$ufzj
000185605 7001_ $$0P:(DE-HGF)0$$aHurst, D. F.$$b9
000185605 7001_ $$0P:(DE-HGF)0$$aJordan, A. F.$$b10
000185605 7001_ $$0P:(DE-HGF)0$$aHall, E. G.$$b11
000185605 7001_ $$0P:(DE-HGF)0$$aVömel, H.$$b12
000185605 7001_ $$0P:(DE-HGF)0$$aDiskin, G. S.$$b13
000185605 7001_ $$0P:(DE-HGF)0$$aPodolske, J. R.$$b14
000185605 7001_ $$0P:(DE-HGF)0$$aChristensen, L. E.$$b15
000185605 7001_ $$0P:(DE-HGF)0$$aRosenlof, K. H.$$b16
000185605 7001_ $$0P:(DE-HGF)0$$aJensen, E. J.$$b17
000185605 7001_ $$0P:(DE-HGF)0$$aFahey, D. W.$$b18
000185605 773__ $$0PERI:(DE-600)2016800-7$$a10.1002/2013JD020817$$n4$$p1915-1935$$tJournal of geophysical research / Atmospheres$$v119$$x0148-0227$$y2014
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000185605 9132_ $$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
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