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Integrated Precipitable Water from GPS Observations and CIMEL Sunphotometer Measurements at CGO Belsk

Authors
  • Kruczyk, Michał
  • Liwosz, Tomasz
  • Pietruczuk, Aleksander
Type
Published Article
Journal
Reports on Geodesy and Geoinformatics
Publisher
De Gruyter Open
Publication Date
Jun 27, 2017
Volume
103
Issue
1
Pages
46–65
Identifiers
DOI: 10.1515/rgg-2017-0005
Source
De Gruyter
Keywords
License
Green

Abstract

This paper describes results of integrated precipitable water co-located measurements from two techniques: GPS solution and CIMEL-318 sunphotometer. Integrated Precipitable Water (IPW) is an important meteorological parameter and is derived from GPS tropospheric solutions for GPS station at Central Geophysical Observatory (CGO), Polish Academy of Sciences (PAS), Belsk and compared with sunphotometer (CIMEL-318 device by Cimel Electronique) data provided by Aerosol Robotic Network (AERONET). Two dedicated and independent GPS solutions: network solution in the sub-network of European Permanent Network (EPN) and precise point positioning solution have been made to obtain tropospheric delays. The quality of dedicated tropospheric solutions has been verified by comparison with EPN tropospheric combined product. Several IPW comparisons and analyses revealed systematic difference between techniques (difference RMS is over 1 mm). IPW bias changes with season: annual close to 1 mm IPW (and semi-annual term also present). IPW bias is a function of atmospheric temperature. Probable cause of this systematic deficiency in solar photometry as IPW retrieval technique is a change of optical filter characteristics in CIMEL.

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