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2020•Unpublished venueRequires access

Validation of integrated water vapor derived from global positioning system over Morocco

Mustapha Elouardi, Karim Benhachemi, Moha El-ayachi

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Abstract

Surface-based global positioning system (GPS) measurements of zenith tropospheric delay (ZTD) can be used for deducing vertically integrated water vapor (IWV) of the atmosphere. In the present study ZTD data from the Moroccan ground-based GPS meteorology stations are converted into IWV, which is validated using equivalent values from radiosonde during one half-year 2016 (15 May-31 December). In particular, the GPS analysis is accomplished in near-real time to furnish estimates of the IWV for evaluating the potential of GPS observations for operational meteorological purposes. The results show that the IWV values derived from GPS observations had an agreement with the radiosonde (RS) observations with a correlation of 0.98 associated with a standard deviation of 2.51 mm and a bias of 1.41 mm.

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What this paper is about

Surface-based global positioning system (GPS) measurements of zenith tropospheric delay (ZTD) can be used for deducing vertically integrated water vapor (IWV) of the atmosphere. In the present study ZTD data from the Moroccan ground-based GPS meteorology stations are converted into IWV, which is validated using equivalent values from radiosonde during one half-year 2016 (15 May-31 December). In particular, the GPS analysis is accomplished in near-real time to furnish estimates of the IWV for evaluating the potential of GPS observations for operational meteorological purposes. The results show that the IWV values derived from GPS observations had an agreement with the radiosonde (RS) observations with a correlation of 0.98 associated with a standard deviation of 2.51 mm and a bias of 1.41 mm.

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Available abstract

Surface-based global positioning system (GPS) measurements of zenith tropospheric delay (ZTD) can be used for deducing vertically integrated water vapor (IWV) of the atmosphere. In the present study ZTD data from the Moroccan ground-based GPS meteorology stations are converted into IWV, which is validated using equivalent values from radiosonde during one half-year 2016 (15 May-31 December). In particular, the GPS analysis is accomplished in near-real time to furnish estimates of the IWV for evaluating the potential of GPS observations for operational meteorological purposes. The results show that the IWV values derived from GPS observations had an agreement with the radiosonde (RS) observations with a correlation of 0.98 associated with a standard deviation of 2.51 mm and a bias of 1.41 mm.

Key concepts: Radiosonde, Global Positioning System, Zenith, Troposphere, Environmental science, Meteorology, Water vapor, Standard deviation

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