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Mass spectrometry for water vapor measurements in the UT/LS

Kaufmann, Stefan and Voigt, Christiane and Schäuble, Dominik and Schäfler, Andreas and Schlager, Hans and Thronberry, Troy and Fahey, David W. (2012) Mass spectrometry for water vapor measurements in the UT/LS. AGU Fall Meeting 2012, 2012-12-03 - 2012-12-07, San Francisco, USA. (Unpublished)

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Water vapor in the lower stratosphere plays a crucial role for the atmospheric radiation budget (Solomon et al., 2011). However, large uncertainties remain in measuring atmospheric water vapor mixing ratios below 10 ppmv typical for the lower stratosphere. To this end, we have developed the Atmospheric Ionization Mass Spectrometer (AIMS) for the accurate and fast detection of water vapor in the UT/LS from aircraft. In the AIMS instrument atmospheric air is directly ionized in a discharge ion source and the resulting water vapor clusters H3O+(H2O)n (n = 0..3) are detected with a linear quadrupole mass spectrometer as a direct measure of the atmospheric water vapor mixing ratio. AIMS is calibrated in-flight with a H2O calibration source using the catalytic reaction of H2 and O2 on a heated platinum surface to form gaseous H2O. This calibration set up combined with the water vapor mass spectrometry offers a powerful technical development in atmospheric hygrometry, enriching existing H2O measurement techniques by a new independent method. Here, we present AIMS water vapor measurements performed during the CONCERT2011 campaign (Contrail and Cirrus Experiment) with the DLR research aircraft Falcon. In September 2011 a deep stratospheric intrusion was probed over northern Europe with a dynamical tropopause lowered down to 6 km. We found sharp humidity gradients between tropospheric and stratospheric air at the edge of the tropopause fold, which we crossed 4 times at altitudes between 6 and 11 km. In the center of the tropopause fold, we measured water vapor mixing ratios down to 4 ppmv. The observed water vapor distribution is compared to water vapor analysis fields of the ECMWF’s Integrated Forecast System (IFS) to evaluate the representation water vapor in this specific meteorological situation.

Item URL in elib:https://elib.dlr.de/81134/
Document Type:Conference or Workshop Item (Poster)
Title:Mass spectrometry for water vapor measurements in the UT/LS
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Voigt, ChristianeUNSPECIFIEDhttps://orcid.org/0000-0001-8925-7731UNSPECIFIED
Schäfler, AndreasUNSPECIFIEDhttps://orcid.org/0000-0002-6165-6623UNSPECIFIED
Date:3 December 2012
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Water Vapor, mass spectrometer, UT/LS
Event Title:AGU Fall Meeting 2012
Event Location:San Francisco, USA
Event Type:international Conference
Event Start Date:3 December 2012
Event End Date:7 December 2012
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:ATM and Operation (old)
DLR - Research area:Aeronautics
DLR - Program:L AO - Air Traffic Management and Operation
DLR - Research theme (Project):L - Climate, Weather and Environment (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Kaufmann, Stefan
Deposited On:08 Feb 2013 16:58
Last Modified:24 Apr 2024 19:47

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