Comparison of HDO measurements from Envisat/MIPAS with observations by Odin/SMR and SCISAT/ACE-FTS

Abstract

Abstract. Measurements of thermal emission in the midinfrared by Envisat/MIPAS allow the retrieval of HDO information roughly in the altitude range between 10 km and 50 km. From June 2002 to March 2004 MIPAS performed measurements in the full spectral resolution mode. To assess the quality of the HDO data set obtained during that period comparisons with measurements by Odin/SMR and SCISAT/ACE-FTS were performed. Comparisons were made on profile-to-profile basis as well as using seasonal and monthly averages. All in all the comparisons yield favourable results. The largest deviations between MIPAS and ACE-FTS are observed below 15 km, where relative deviations can occasionally exceed 100 %. Despite these deviations in the absolute amount of HDO the latitudinal structures observed by both instruments are consistent in this altitude range. Between 15 km and 20 km there is less good agreement, in particular in the Antarctic during winter and spring. Also in the tropics some deviations are found. Above 20 km there is a high consistency in the structures observed by all three instruments. MIPAS and ACE-FTS typically agreeCorrespondence to: S. Lossow (stefan.lossow@kit.edu) within 10 %, with MIPAS mostly showing higher abundances than ACE-FTS. Both data sets show considerably more HDO than SMR. This bias can be explained basically by uncertainties in spectroscopic parameters. Above 40 km, where the MIPAS HDO retrieval reaches its limits, still good agreement with the structures observed by SMR is found for most seasons. This puts some confidence in the MIPAS data at these altitudes.

The MUSICA MetOp/IASI H<sub>2</sub>O and δD products: characterisation and long-term comparison to NDACC/FTIR data

“…Furthermore, there are space-borne scientific sensors that measure middle tropospheric δD (Worden et al, 2007) and δD at and above the upper troposphere and lower stratosphere (e.g. Steinwagner et al, 2007;Payne et al, 2007;Lossow et al, 2011). Most recently, middle tropospheric δD products applying the operational meteorological satellite sensor IASI (Infrared Atmospheric Sounding Interferometer) have been presented by Schneider and Hase (2011a), Lacour et al (2012), and Pommier et al (2014).…”

UTLS water vapour from SCIAMACHY limb measurementsV3.01 (2002–2012)

“…The data are filtered to omit profiles with visibility flag equal 0 (indicating clouds) and diagonal elements of the AVK smaller than 0.03, as described by e.g. Lossow et al (2011). We excluded all profiles with these values between 10 and 25 km height.…”

Developing a western Siberia reference site for tropospheric water vapour isotopologue observations obtained by different techniques (in situ and remote sensing)

“…Comparison between different sets of δD have been performed before - Lossow et al (2011) compared between retrievals from different satellite sensors (Envisat/MIPAS, Odin/SMR, SCISAT/ACE-FTS), Schneider andHase (2011) compared IASI andNDACC FTIR retrievals, Boesch et al (2013) compared GOSAT short-wave infrared and TCCON FTIR retrievals, and Worden et al (2011) compared TES retrievals with in situ measurements. Here, we intercompare two independent data sources (PICARRO and FTIR) using the outputs of the ECHAM5-wiso isotopic AGCM (T63) that has been run in a nudged version using ERA-Interim reanalysis fields (Dee et al, 2011;Berrisford et al, 2009).…”