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|Title: ||Validation of integrated water vapor from OMI satellite instrument against reference GPS data at the Iberian Peninsula|
|Authors: ||Vaquero-Martínez, Javier|
Ortiz de Galisteo, José Pablo
Cachorro, Victoria E.
Abad, Gonzalo González
Costa, Maria João
|Issue Date: ||Feb-2017|
|Citation: ||Vaquero-Martinez, J., M. Anton, J. P. Ortiz de Galisteo, V. E. Cachorro, H. Wang, G. González Abad, R. Roman, and M. J. Costa. 2017: Validation of integrated water vapor from OMI satellite instrument against reference GPS data at the Iberian Peninsula. Science of the Total Environment|
|Abstract: ||This paper shows the validation of integrated water vapor (IWV) measurements retrieved from the Ozone
Monitoring Instrument (OMI), using as reference nine ground-based GPS stations in the Iberian Peninsula.
The study period covers from 2007 to 2009. The influence of two factors, - solar zenith angle (SZA) and IWV -,
on OMI-GPS differences was studied in detail, as well as the seasonal dependence. The pseudomedian of the
relative differences is −1 ± 1% and the inter-quartile range (IQR) is 41%. Linear regressions calculated over
each station show an acceptable agreement (R2 up to 0.77). The OMI-GPS differences display a clear dependence
on IWV values. Hence, OMI substantially overestimates the lower IWV data recorded by GPS (∼40%),
while underestimates the higher IWV reference values (∼20%). In connection to this IWV dependence, the
relative differences also show an evident SZA dependence when the whole range of IWV values are analyzed
(OMI overestimates for high SZA values while underestimates for low values). Finally, the seasonal variation
of the OMI-GPS differences is also associated with the strong IWV dependence found in this validation
|Appears in Collections:||FIS - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica|
CGE - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica
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