Articles | Volume 19, issue 14
Atmos. Chem. Phys., 19, 9453–9468, 2019
https://doi.org/10.5194/acp-19-9453-2019

Special issue: Advanced Global Navigation Satellite Systems tropospheric...

Atmos. Chem. Phys., 19, 9453–9468, 2019
https://doi.org/10.5194/acp-19-9453-2019

Research article 24 Jul 2019

Research article | 24 Jul 2019

Consistency and representativeness of integrated water vapour from ground-based GPS observations and ERA-Interim reanalysis

Olivier Bock and Ana C. Parracho

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Cited articles

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Bastin, S., Champollion, C., Bock, O., Drobinski, P., and Masson, F.: Diurnal cycle of water vapor as documented by a dense GPS network in a coastal area during ESCOMPTE-IOP2, J. Appl. Meteorol. Clim., 46, 167–182, 2007. 
Bastin, S., Drobinski, P., Chiriaco, M., Bock, O., Roehrig, R., Gallardo, C., Conte, D., Domínguez Alonso, M., Li, L., Lionello, P., and Parracho, A. C.: Impact of humidity biases on light precipitation occurrence: observations versus simulations, Atmos. Chem. Phys., 19, 1471–1490, https://doi.org/10.5194/acp-19-1471-2019, 2019. 
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We examine the consistency of global IWV data from ERA-Interim reanalysis and 16 years of GPS observations. Representativeness differences are found to be a dominant error source, with a strong dependence on geographic, topographic, and climatic features, which explain both average and extreme differences. A methodology for reducing the representativeness errors and detecting the extreme, outlying, cases is discussed.
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