Optimal estimation of tropospheric H 2 O and δD with IASI/METOP
TLDR
In this article, the IASI spectra were used to retrieve H2O profiles between the surface and the upper troposphere as well as middle tro- pospheric D values.Abstract:
We present optimal estimates of tropospheric H2O and D derived from radiances measured by the instrument IASI (Infrared Atmospheric Sounding Interferometer) flown on EUMETSAT's polar orbiter METOP. We document that the IASI spectra allow for retrieving H2O profiles between the surface and the upper troposphere as well as middle tro- pospheric D values. A theoretical error estimation suggests a precision for H2O of better than 35 % in the lower tro- posphere and of better than 15 % in the middle and upper troposphere, respectively, whereby surface emissivity and atmospheric temperature uncertainties are the leading error sources. For the middle tropospheric D values we estimate a precision of 15-20 ‰ with the measurement noise being the dominating error source. The accuracy of the IASI products is estimated to about 20-10 % and 10 ‰ for lower to upper tropospheric H2O and middle tropospheric D, respectively. It is limited by systematic uncertainties in the applied spec- troscopic parameters and the a priori atmospheric tempera- ture profiles. We compare our IASI products to a large num- ber of near coincident radiosonde in-situ and ground-based FTS (Fourier Transform Spectrometer) remote sensing mea- surements. The bias and the scatter between the different H2O and D data sets are consistent with the combined theo- retical uncertainties of the involved measurement techniques.read more
Citations
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Journal ArticleDOI
Moist processes during MJO events as diagnosed from water isotopic measurements from the IASI satellite
Obbe Tuinenburg,Camille Risi,Jean-Lionel Lacour,Matthias Schneider,A. Wiegele,John Worden,Naoyuki Kurita,Jean-Philippe Duvel,Nicholas M. Deutscher,Sandrine Bony,Pierre-François Coheur,Cathy Clerbaux,Cathy Clerbaux +12 more
TL;DR: In this article, the Madden-Julian oscillation (MJO) was investigated by making use of joint HDO (or δD) and H2O vapor measurements, and the authors determined the variability in this evolution during about eight MJO events.
Journal ArticleDOI
Evaluating Instrumental Inhomogeneities in Global Radiosonde Upper Tropospheric Humidity Data Using Microwave Satellite Data
TL;DR: The overall quality of the water vapor profiles of global operational radiosonde data for the period 2000-2009 is investigated using upper tropospheric humidity (UTH) retrieved from microwave satellite data to show a dry bias over Europe, Australia, and New Zealand and systematically moist bias over China and the former Soviet Union.
Journal ArticleDOI
Intercomparison of XH2O Data from the GOSAT TANSO-FTS (TIR and SWIR) and Ground-Based FTS Measurements: Impact of the Spatial Variability of XH2O on the Intercomparison
TL;DR: It is demonstrated that, in order to accurately evaluate the measurement precision of XH2O, it is necessary to set more rigorous spatial coincidence criteria or to take into account the spatial variability of Xh2O as derived in the present study.
Journal ArticleDOI
Comparison of optimal estimation HDO∕H 2 O retrievals from AIRS with ORACLES measurements
Robert L. Herman,John Worden,David Noone,Dean Henze,Kevin W. Bowman,Karen Cady-Pereira,Vivienne H. Payne,Susan S. Kulawik,Dejian Fu +8 more
TL;DR: In this article, the deuterium content of water vapor from the Aqua Atmospheric InfraRed Sounder (AIRS) with aircraft measurements of HDO and H2O from the ObseRvations of Aerosols above Clouds and their intEractionS (ORACLES) field mission is evaluated.
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