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A reassessment of the discrepancies in the annual variation of δD-H2O in the tropical lower stratosphere between the MIPAS and ACE-FTS satellite data sets

Lossow, Stefan and Högberg, Charlotte and Khosrawi, Farahnaz and Stiller, Gabriele and Bauer, Ralf and Walker, Kaley A. and Kellmann, Sylvia and Linden, Andrea and Kiefer, Michael and Glatthor, Norbert and von Clarmann, Thomas and Murtagh, Donald and Steinwagner, Jörg and Röckmann, Thomas and Eichinger, Roland (2020) A reassessment of the discrepancies in the annual variation of δD-H2O in the tropical lower stratosphere between the MIPAS and ACE-FTS satellite data sets. Atmospheric Measurement Techniques (AMT), 13, pp. 287-308. Copernicus Publications. doi: 10.5194/amt-13-287-2020. ISSN 1867-1381.

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Official URL: https://www.atmos-meas-tech.net/13/287/2020/


The annual variation of δD in the tropical lower stratosphere is a critical indicator for the relative importance of different processes contributing to the transport of water vapour through the cold tropical tropopause region into the stratosphere. Distinct observational discrepancies of the δD annual variation were visible in the works of Steinwagner et al. (2010) and Randel et al. (2012). Steinwagner et al. (2010) analysed MIPAS (Michelson Interferometer for Passive Atmospheric Sounding) observations retrieved with the IMK/IAA (Institut für Meteorologie und Klimaforschung in Karlsruhe, Germany, in collaboration with the Instituto de Astrofísica de Andalucía in Granada, Spain) processor, while Randel et al. (2012) focused on ACE-FTS (Atmospheric Chemistry Experiment Fourier Transform Spectrometer) observations. Here we reassess the discrepancies based on newer MIPAS (IMK/IAA) and ACE-FTS data sets, also showing for completeness results from SMR (Sub-Millimetre Radiometer) observations and a ECHAM/MESSy (European Centre for Medium-Range Weather Forecasts Hamburg and Modular Earth Submodel System) Atmospheric Chemistry (EMAC) simulation (Eichinger et al., 2015b). Similar to the old analyses, the MIPAS data set yields a pronounced annual variation (maximum about 75 ‰), while that derived from the ACE-FTS data set is rather weak (maximum about 25 ‰). While all data sets exhibit the phase progression typical for the tape recorder, the annual maximum in the ACE-FTS data set precedes that in the MIPAS data set by 2 to 3 months. We critically consider several possible reasons for the observed discrepancies, focusing primarily on the MIPAS data set. We show that the δD annual variation in the MIPAS data up to an altitude of 40 hPa is substantially impacted by a “start altitude effect”, i.e. dependency between the lowermost altitude where MIPAS retrievals are possible and retrieved data at higher altitudes. In itself this effect does not explain the differences with the ACE-FTS data. In addition, there is a mismatch in the vertical resolution of the MIPAS HDO and H2O data (being consistently better for HDO), which actually results in an artificial tape-recorder-like signal in δD. Considering these MIPAS characteristics largely removes any discrepancies between the MIPAS and ACE-FTS data sets and shows that the MIPAS data are consistent with a δD tape recorder signal with an amplitude of about 25 ‰ in the lowermost stratosphere.

Item URL in elib:https://elib.dlr.de/133949/
Document Type:Article
Title:A reassessment of the discrepancies in the annual variation of δD-H2O in the tropical lower stratosphere between the MIPAS and ACE-FTS satellite data sets
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Lossow, StefanKIT, KarlsruheUNSPECIFIED
Högberg, CharlotteUniv. Stockholm, SchwedenUNSPECIFIED
Khosrawi, FarahnazUniv. Stockholm, SchwedenUNSPECIFIED
Stiller, GabrieleKIT, KarlsruheUNSPECIFIED
Bauer, RalfUniv. Toronto, KanadaUNSPECIFIED
Walker, Kaley A.Univ. Toronto, KanadaUNSPECIFIED
Kellmann, SylviaKIT, KarlsruheUNSPECIFIED
Linden, AndreaKIT, KarlsruheUNSPECIFIED
Kiefer, MichaelKIT, KarlsruheUNSPECIFIED
Glatthor, NorbertKIT, KarlsruheUNSPECIFIED
von Clarmann, ThomasKIT, KarlsruheUNSPECIFIED
Murtagh, DonaldChalmers Univ. of Technology, Göteborg, SchwedenUNSPECIFIED
Steinwagner, JörgMax-Plack-Institut Extraterr. Physik, GarchingUNSPECIFIED
Röckmann, ThomasUniv. of Utrecht, NiederlandeUNSPECIFIED
Date:28 January 2020
Journal or Publication Title:Atmospheric Measurement Techniques (AMT)
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 287-308
Publisher:Copernicus Publications
Keywords:HDO, H2O, Stratosphere, tape recorder, Satellites, EMAC, H2OISO, MIPAS, ACE-FTS, water isotopes
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Atmospheric and climate research, R - Middle Atmosphere
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Earth System Modelling
Institute of Atmospheric Physics
Deposited By: Eichinger, Roland
Deposited On:03 Feb 2020 23:35
Last Modified:03 Feb 2020 23:35

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