lmd_Picon2014.bib

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@article{2014ACP....1411129S,
  author = {{Schr{\"o}der}, M. and {Roca}, R. and {Picon}, L. and {Kniffka}, A. and 
	{Brogniez}, H.},
  title = {{Climatology of free-tropospheric humidity: extension into the SEVIRI era, evaluation and exemplary analysis}},
  journal = {Atmospheric Chemistry \& Physics},
  year = 2014,
  month = oct,
  volume = 14,
  pages = {11129-11148},
  abstract = {{A new free-tropospheric humidity (FTH) data record is presented. It is
based on observations from the Meteosat Visible and Infrared Imager
(MVIRI) onboard Meteosat-2-Meteosat-5, as well as Meteosat-7, and the
Spinning Enhanced Visible and Infrared Imager (SEVIRI) onboard
Meteosat-8 and Meteosat-9 at the water absorption band near 6.3 {$\mu$}m.
The data set is available under clear-sky and low-level cloud
conditions. With the extension to SEVIRI observations, the data record
covers the period 1983-2009 with a spatial resolution of 0.625{\deg}
{\times} 0.625{\deg} and a temporal resolution of 3 h. 

 The
FTH is the mean relative humidity (RH) in a broad layer in the free
troposphere. The relation between the observed brightness temperature
(BT) and the FTH is well established. Previous retrievals are refined by
taking into account the relative humidity Jacobians in the training
process of the statistical retrieval. The temporal coverage is extended
into the SEVIRI period, the homogenization of the BT record is improved,
and the full archive is reprocessed using updated regression
coefficients. 

 The FTH estimated from the Meteosat
observations is compared to the FTH computed from the RH profiles of the
Analyzed RadioSoundings Archive (ARSA). An average relative bias of
-3.2\% and a relative root-mean-square difference (RMSD) of 16.8\% are
observed. This relative RMSD agrees with the outcome of an analysis of
the total uncertainty of the FTH product. The decadal stability of the
FTH data record is 0.5 {\plusmn} 0.45\% per decade. 

 As
exemplary applications, the interannual standard deviation, the
differences on decadal scales, and the linear trend in the FTH data
record and in the frequency of occurrence of FTH {\lt} 10\% (FTHp10) are
analyzed per season. Interannual standard deviation maxima and maxima in
absolute decadal differences are featured in gradient areas between dry
and wet regions, as well as in areas where FTH reaches minima and FTHp10
reaches maxima. An analysis of the FTH linear trends and of the
associated uncertainty estimates is achieved to identify possible
problems with the data record. Positive trends in FTHp10 are featured in
gradient areas between wet and dry regions, in regions where the FTH is
minimum, in regions where FTHp10 is maximum, and in regions where
differences between FTHp10 averaged over the 2000s and 1990s are
negative. However, these positive trends in FTHp10 are associated with
maximum standard deviation and are thus hardly significant. This
analysis and intercomparisons with other humidity data records are part
of the Global Energy and Water Cycle Experiment (GEWEX) Water Vapor
Assessment (G-VAP).
}},
  doi = {10.5194/acp-14-11129-2014},
  adsurl = {http://adsabs.harvard.edu/abs/2014ACP....1411129S},
  adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}