Journal Article

FZJ-2015-06641

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Quality assessment of MOZAIC and IAGOS capacitive hygrometers: insights from airborne field studies

Neis, P. (Corresponding author)FZJ* ; Smit, H. G. J.FZJ* ; Rohs, S.FZJ* ; Bundke, U.FZJ* ; Krämer, M.FZJ* ; Spelten, N.FZJ* ; Ebert, V. ; Buchholz, B. ; Thomas, K.FZJ* ; Petzold, A.FZJ*

2015
Inst. Stockholm

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Please use a persistent id in citations: http://hdl.handle.net/2128/9443  doi:10.3402/tellusb.v67.28320

Abstract: In 2011, the MOZAIC (Measurement of Ozone by AIRBUS In-Service Aircraft) successor programme IAGOS (In-service Aircraft for a Global Observing System) started to equip their long-haul passenger aircraft with the modified capacitive hygrometer Vaisala HUMICAP® of type H. The assurance of the data quality and the consistency of the data set during the transition from MOZAIC Capacitive Hygrometers to IAGOS Capacitive Hygrometers were evaluated within the CIRRUS-III and AIRTOSS-ICE field studies. During these performance tests, the capacitive hygrometers were operated aboard a Learjet 35A aircraft together with a closed-cell Lyman-α fluorescence hygrometer, an open-path tunable diode laser (TDL) system and a closed-cell, direct TDL absorption hygrometer for water vapour measurement. For MOZAIC-typical operation conditions, the comparison of relative humidity (RH) data from the capacitive hygrometers and reference instruments yielded remarkably good agreement with an uncertainty of 5% RH. The temperature dependence of the sensor’s response time was derived from the cross-correlation of capacitive hygrometer data and smoothed data from the fast-responding reference instruments. The resulting exponential moving average function could explain the major part of the observed deviations between the capacitive hygrometers and the reference instruments.

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Contributing Institute(s):

1. Troposphäre (IEK-8)
2. Stratosphäre (IEK-7)

Research Program(s):

1. 243 - Tropospheric trace substances and their transformation processes (POF3-243) (POF3-243)
2. 244 - Composition and dynamics of the upper troposphere and middle atmosphere (POF3-244) (POF3-244)
3. IAGOS-D - In-Service Aircraft for a Global Observing System – German Contribution to the Main Phase of IAGOS (BMBF-20180331-IAGOSD) (BMBF-20180331-IAGOSD)
4. HITEC - Helmholtz Interdisciplinary Doctoral Training in Energy and Climate Research (HITEC) (HITEC-20170406) (HITEC-20170406)

Appears in the scientific report 2015

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Database coverage:
; ; ; ; BIOSIS Previews ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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