Estimation of precipitable water vapour from GPS measurements in Argentina: Validation and qualitative analysis of results
This paper presents PWV estimates from GPS data computed at four continuously operated GPS stations in Argentina established at Buenos Aires, Córdoba, Rosario and Salta over a 1 year period (2006-2007). The objective is to analyze the behaviour of the GPS PWV estimation using mean tropospheric tempe...
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todo:paper_02731177_v46_n7_p879_Fernandez2023-10-03T15:15:40Z Estimation of precipitable water vapour from GPS measurements in Argentina: Validation and qualitative analysis of results Fernández, L.I. Salio, P. Natali, M.P. Meza, A.M. Global Positioning System Mean tropospheric temperature Precipitable water vapour Argentina Available water Best choice Buenos Aires Environmental prediction Extreme precipitation GPS data High precipitations Northern Hemispheres Numerical integrations Operational analysis Over-estimation Precipitable water vapour Qualitative analysis Radio soundings Satellite mission Tropospheric temperature Estimation Integration Microwave sensors Precipitation (meteorology) Quality control Troposphere Global positioning system This paper presents PWV estimates from GPS data computed at four continuously operated GPS stations in Argentina established at Buenos Aires, Córdoba, Rosario and Salta over a 1 year period (2006-2007). The objective is to analyze the behaviour of the GPS PWV estimation using mean tropospheric temperature (Tm) values from the Bevis model, Sapucci model and obtained by a numerical integration of variables provided by the operational analysis of the National Centre of Environmental Prediction (NCEP). The results are validated using PWV values from nearest radio soundings. Moreover, a comparison between PWV values determined from microwave sensors deployed on the NOAA-18 satellite and PWV from GPS observations is also presented. From the analysis we can see that the computation of GPS PWV using the Tm from the Bevis model, originally deduced for the northern hemisphere, shows similar behaviour to the respective computation using a Sapucci model inside 0.5 mm. The differences between the Tm values computed from the Sapucci model and the numerical integration of NCEP variables are of the order of 15 K, although it does not represent a significant error in PWV. Nevertheless, differences in bias are imperceptible during the dry period and they are as big as 3 mm during the moist or high precipitation period. This behaviour could not represent an improvement when comparing radio soundings with respect to the GPS PWV values using different estimations of Tm. Thus, we conclude that the usage of Tm estimated from the Bevis model is the best choice for regional studies, considering the simplicity and dissemination of the method, unless some more studies taking into account the geographical and climatological characteristic of the region are performed. As expected, GPS PWV values show very good agreement with radio sounding determinations, small differences can be observed especially during extreme precipitation periods. In general the NOAA PWV values denote an over estimation of the available water vapour. It is important to note that the determination of PWV is not the mean product of the NOAA-18 satellite mission. These results show the potential of such a product although a preliminary calibration using GPS PWV is still necessary. © 2010 COSPAR. Published by Elsevier Ltd. All rights reserved. Fil:Salio, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_02731177_v46_n7_p879_Fernandez |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Global Positioning System Mean tropospheric temperature Precipitable water vapour Argentina Available water Best choice Buenos Aires Environmental prediction Extreme precipitation GPS data High precipitations Northern Hemispheres Numerical integrations Operational analysis Over-estimation Precipitable water vapour Qualitative analysis Radio soundings Satellite mission Tropospheric temperature Estimation Integration Microwave sensors Precipitation (meteorology) Quality control Troposphere Global positioning system |
| spellingShingle |
Global Positioning System Mean tropospheric temperature Precipitable water vapour Argentina Available water Best choice Buenos Aires Environmental prediction Extreme precipitation GPS data High precipitations Northern Hemispheres Numerical integrations Operational analysis Over-estimation Precipitable water vapour Qualitative analysis Radio soundings Satellite mission Tropospheric temperature Estimation Integration Microwave sensors Precipitation (meteorology) Quality control Troposphere Global positioning system Fernández, L.I. Salio, P. Natali, M.P. Meza, A.M. Estimation of precipitable water vapour from GPS measurements in Argentina: Validation and qualitative analysis of results |
| topic_facet |
Global Positioning System Mean tropospheric temperature Precipitable water vapour Argentina Available water Best choice Buenos Aires Environmental prediction Extreme precipitation GPS data High precipitations Northern Hemispheres Numerical integrations Operational analysis Over-estimation Precipitable water vapour Qualitative analysis Radio soundings Satellite mission Tropospheric temperature Estimation Integration Microwave sensors Precipitation (meteorology) Quality control Troposphere Global positioning system |
| description |
This paper presents PWV estimates from GPS data computed at four continuously operated GPS stations in Argentina established at Buenos Aires, Córdoba, Rosario and Salta over a 1 year period (2006-2007). The objective is to analyze the behaviour of the GPS PWV estimation using mean tropospheric temperature (Tm) values from the Bevis model, Sapucci model and obtained by a numerical integration of variables provided by the operational analysis of the National Centre of Environmental Prediction (NCEP). The results are validated using PWV values from nearest radio soundings. Moreover, a comparison between PWV values determined from microwave sensors deployed on the NOAA-18 satellite and PWV from GPS observations is also presented. From the analysis we can see that the computation of GPS PWV using the Tm from the Bevis model, originally deduced for the northern hemisphere, shows similar behaviour to the respective computation using a Sapucci model inside 0.5 mm. The differences between the Tm values computed from the Sapucci model and the numerical integration of NCEP variables are of the order of 15 K, although it does not represent a significant error in PWV. Nevertheless, differences in bias are imperceptible during the dry period and they are as big as 3 mm during the moist or high precipitation period. This behaviour could not represent an improvement when comparing radio soundings with respect to the GPS PWV values using different estimations of Tm. Thus, we conclude that the usage of Tm estimated from the Bevis model is the best choice for regional studies, considering the simplicity and dissemination of the method, unless some more studies taking into account the geographical and climatological characteristic of the region are performed. As expected, GPS PWV values show very good agreement with radio sounding determinations, small differences can be observed especially during extreme precipitation periods. In general the NOAA PWV values denote an over estimation of the available water vapour. It is important to note that the determination of PWV is not the mean product of the NOAA-18 satellite mission. These results show the potential of such a product although a preliminary calibration using GPS PWV is still necessary. © 2010 COSPAR. Published by Elsevier Ltd. All rights reserved. |
| format |
JOUR |
| author |
Fernández, L.I. Salio, P. Natali, M.P. Meza, A.M. |
| author_facet |
Fernández, L.I. Salio, P. Natali, M.P. Meza, A.M. |
| author_sort |
Fernández, L.I. |
| title |
Estimation of precipitable water vapour from GPS measurements in Argentina: Validation and qualitative analysis of results |
| title_short |
Estimation of precipitable water vapour from GPS measurements in Argentina: Validation and qualitative analysis of results |
| title_full |
Estimation of precipitable water vapour from GPS measurements in Argentina: Validation and qualitative analysis of results |
| title_fullStr |
Estimation of precipitable water vapour from GPS measurements in Argentina: Validation and qualitative analysis of results |
| title_full_unstemmed |
Estimation of precipitable water vapour from GPS measurements in Argentina: Validation and qualitative analysis of results |
| title_sort |
estimation of precipitable water vapour from gps measurements in argentina: validation and qualitative analysis of results |
| url |
http://hdl.handle.net/20.500.12110/paper_02731177_v46_n7_p879_Fernandez |
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