Comparison of precipitable water over Ghana using GPS signals and reanalysis products

TY - JOUR

T1 - Comparison of precipitable water over Ghana using GPS signals and reanalysis products

AU - Acheampong, A.A.

AU - Fosu, C.

AU - Amekudzi, L.K.

AU - Kaas, Eigil

PY - 2015/11/30

Y1 - 2015/11/30

N2 - Signals from Global Navigational Satellite Systems (GNSS) when integrated with surface meteorological parameters can be used to sense atmospheric water vapour. Using gLAB software and employing precise point positioning techniques, zenith troposphere delays (ZTD) for a GPS base station at KNUST, Kumasi have been computed and used to retrieve Precipitable Water (PW). The PW values obtained were compared with products from ERA-Interim and NCEP reanalysis data. The correlation coefficients, r, determined from these comparisons were 0.839 and 0.729 for ERA-interim and NCEP respectively. This study has demonstrated that water vapour can be retrieved with high precision from GNSS signal. Furthermore, a location map have been produced to serve as a guide in adopting and installing GNSS base stations in Ghana to achieve a country wide coverage of GNSS based water vapour monitoring.

AB - Signals from Global Navigational Satellite Systems (GNSS) when integrated with surface meteorological parameters can be used to sense atmospheric water vapour. Using gLAB software and employing precise point positioning techniques, zenith troposphere delays (ZTD) for a GPS base station at KNUST, Kumasi have been computed and used to retrieve Precipitable Water (PW). The PW values obtained were compared with products from ERA-Interim and NCEP reanalysis data. The correlation coefficients, r, determined from these comparisons were 0.839 and 0.729 for ERA-interim and NCEP respectively. This study has demonstrated that water vapour can be retrieved with high precision from GNSS signal. Furthermore, a location map have been produced to serve as a guide in adopting and installing GNSS base stations in Ghana to achieve a country wide coverage of GNSS based water vapour monitoring.

U2 - 10.1515/jogs-2015-0016

DO - 10.1515/jogs-2015-0016

M3 - Journal article

SN - 2081-9919

VL - 5

SP - 163

EP - 170

JO - Journal of Geodetic Science

JF - Journal of Geodetic Science

IS - 1

ER -