Precipitable water vapour content from ESR/SKYNET sun–sky radiometers: validation against GNSS/GPS and AERONET over three different sites in Europe
The estimation of the precipitable water vapour content ( W ) with high temporal and spatial resolution is of great interest to both meteorological and climatological studies. Several methodologies based on remote sensing techniques have been recently developed in order to obtain accurate and freque...
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ftdoajarticles:oai:doaj.org/article:5fe5e36dfe8d4a58b0e88a353dd91f30 2023-05-15T13:06:50+02:00 Precipitable water vapour content from ESR/SKYNET sun–sky radiometers: validation against GNSS/GPS and AERONET over three different sites in Europe M. Campanelli A. Mascitelli P. Sanò H. Diémoz V. Estellés S. Federico A. M. Iannarelli F. Fratarcangeli A. Mazzoni E. Realini M. Crespi O. Bock J. A. Martínez-Lozano S. Dietrich 2018-01-01T00:00:00Z https://doi.org/10.5194/amt-11-81-2018 https://doaj.org/article/5fe5e36dfe8d4a58b0e88a353dd91f30 EN eng Copernicus Publications https://www.atmos-meas-tech.net/11/81/2018/amt-11-81-2018.pdf https://doaj.org/toc/1867-1381 https://doaj.org/toc/1867-8548 doi:10.5194/amt-11-81-2018 1867-1381 1867-8548 https://doaj.org/article/5fe5e36dfe8d4a58b0e88a353dd91f30 Atmospheric Measurement Techniques, Vol 11, Pp 81-94 (2018) Environmental engineering TA170-171 Earthwork. Foundations TA715-787 article 2018 ftdoajarticles https://doi.org/10.5194/amt-11-81-2018 2022-12-31T11:33:31Z The estimation of the precipitable water vapour content ( W ) with high temporal and spatial resolution is of great interest to both meteorological and climatological studies. Several methodologies based on remote sensing techniques have been recently developed in order to obtain accurate and frequent measurements of this atmospheric parameter. Among them, the relative low cost and easy deployment of sun–sky radiometers, or sun photometers, operating in several international networks, allowed the development of automatic estimations of W from these instruments with high temporal resolution. However, the great problem of this methodology is the estimation of the sun-photometric calibration parameters. The objective of this paper is to validate a new methodology based on the hypothesis that the calibration parameters characterizing the atmospheric transmittance at 940 nm are dependent on vertical profiles of temperature, air pressure and moisture typical of each measurement site. To obtain the calibration parameters some simultaneously seasonal measurements of W , from independent sources, taken over a large range of solar zenith angle and covering a wide range of W , are needed. In this work yearly GNSS/GPS datasets were used for obtaining a table of photometric calibration constants and the methodology was applied and validated in three European ESR-SKYNET network sites, characterized by different atmospheric and climatic conditions: Rome, Valencia and Aosta. Results were validated against the GNSS/GPS and AErosol RObotic NETwork (AERONET) W estimations. In both the validations the agreement was very high, with a percentage RMSD of about 6, 13 and 8 % in the case of GPS intercomparison at Rome, Aosta and Valencia, respectively, and of 8 % in the case of AERONET comparison in Valencia. Analysing the results by W classes, the present methodology was found to clearly improve W estimation at low W content when compared against AERONET in terms of % bias, bringing the agreement with the GPS (considered the reference ... Article in Journal/Newspaper Aerosol Robotic Network Directory of Open Access Journals: DOAJ Articles Atmospheric Measurement Techniques 11 1 81 94 |
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Directory of Open Access Journals: DOAJ Articles |
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language |
English |
topic |
Environmental engineering TA170-171 Earthwork. Foundations TA715-787 |
spellingShingle |
Environmental engineering TA170-171 Earthwork. Foundations TA715-787 M. Campanelli A. Mascitelli P. Sanò H. Diémoz V. Estellés S. Federico A. M. Iannarelli F. Fratarcangeli A. Mazzoni E. Realini M. Crespi O. Bock J. A. Martínez-Lozano S. Dietrich Precipitable water vapour content from ESR/SKYNET sun–sky radiometers: validation against GNSS/GPS and AERONET over three different sites in Europe |
topic_facet |
Environmental engineering TA170-171 Earthwork. Foundations TA715-787 |
description |
The estimation of the precipitable water vapour content ( W ) with high temporal and spatial resolution is of great interest to both meteorological and climatological studies. Several methodologies based on remote sensing techniques have been recently developed in order to obtain accurate and frequent measurements of this atmospheric parameter. Among them, the relative low cost and easy deployment of sun–sky radiometers, or sun photometers, operating in several international networks, allowed the development of automatic estimations of W from these instruments with high temporal resolution. However, the great problem of this methodology is the estimation of the sun-photometric calibration parameters. The objective of this paper is to validate a new methodology based on the hypothesis that the calibration parameters characterizing the atmospheric transmittance at 940 nm are dependent on vertical profiles of temperature, air pressure and moisture typical of each measurement site. To obtain the calibration parameters some simultaneously seasonal measurements of W , from independent sources, taken over a large range of solar zenith angle and covering a wide range of W , are needed. In this work yearly GNSS/GPS datasets were used for obtaining a table of photometric calibration constants and the methodology was applied and validated in three European ESR-SKYNET network sites, characterized by different atmospheric and climatic conditions: Rome, Valencia and Aosta. Results were validated against the GNSS/GPS and AErosol RObotic NETwork (AERONET) W estimations. In both the validations the agreement was very high, with a percentage RMSD of about 6, 13 and 8 % in the case of GPS intercomparison at Rome, Aosta and Valencia, respectively, and of 8 % in the case of AERONET comparison in Valencia. Analysing the results by W classes, the present methodology was found to clearly improve W estimation at low W content when compared against AERONET in terms of % bias, bringing the agreement with the GPS (considered the reference ... |
format |
Article in Journal/Newspaper |
author |
M. Campanelli A. Mascitelli P. Sanò H. Diémoz V. Estellés S. Federico A. M. Iannarelli F. Fratarcangeli A. Mazzoni E. Realini M. Crespi O. Bock J. A. Martínez-Lozano S. Dietrich |
author_facet |
M. Campanelli A. Mascitelli P. Sanò H. Diémoz V. Estellés S. Federico A. M. Iannarelli F. Fratarcangeli A. Mazzoni E. Realini M. Crespi O. Bock J. A. Martínez-Lozano S. Dietrich |
author_sort |
M. Campanelli |
title |
Precipitable water vapour content from ESR/SKYNET sun–sky radiometers: validation against GNSS/GPS and AERONET over three different sites in Europe |
title_short |
Precipitable water vapour content from ESR/SKYNET sun–sky radiometers: validation against GNSS/GPS and AERONET over three different sites in Europe |
title_full |
Precipitable water vapour content from ESR/SKYNET sun–sky radiometers: validation against GNSS/GPS and AERONET over three different sites in Europe |
title_fullStr |
Precipitable water vapour content from ESR/SKYNET sun–sky radiometers: validation against GNSS/GPS and AERONET over three different sites in Europe |
title_full_unstemmed |
Precipitable water vapour content from ESR/SKYNET sun–sky radiometers: validation against GNSS/GPS and AERONET over three different sites in Europe |
title_sort |
precipitable water vapour content from esr/skynet sun–sky radiometers: validation against gnss/gps and aeronet over three different sites in europe |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/amt-11-81-2018 https://doaj.org/article/5fe5e36dfe8d4a58b0e88a353dd91f30 |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_source |
Atmospheric Measurement Techniques, Vol 11, Pp 81-94 (2018) |
op_relation |
https://www.atmos-meas-tech.net/11/81/2018/amt-11-81-2018.pdf https://doaj.org/toc/1867-1381 https://doaj.org/toc/1867-8548 doi:10.5194/amt-11-81-2018 1867-1381 1867-8548 https://doaj.org/article/5fe5e36dfe8d4a58b0e88a353dd91f30 |
op_doi |
https://doi.org/10.5194/amt-11-81-2018 |
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Atmospheric Measurement Techniques |
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