Shaoqi Gong (Author), Wenqin Chen (Author), Cunjie Zhang (Author), Ping Wu (Author), Jing Han (Author)

Abstract

Atmosfeska vsebnost vodne pare v stolpcu zraka PWV (angl. precipitable water vapor) je globalno izrednega pomena tako z vidika hidriloškega kroženja kot prenosa energije. Radiosonde, sončni fotometer in sprejemniki GPS (pa tudi širše GNSS) so postali temeljni instrumenti za terestrično opazovanje PVW. Pri študiji smo imeli na voljo vse tri instrumente, ki so bili hkrati nameščeni na opazovalnih postajah, ki so geografsko pokrivale tri tipične podnebne pasove. Podatke PWV z vseh instrumentov smo združili glede na čas opazovanj. Po tem, ko smo odstranili izstopajoča opazovanja, smo izvedli primerjavo vrendosti PWV za vsak par opazovanj različnih instrumentov. Ugotavljamo, da geografska širina in podnebje ne vplivata pomembneje na vrednosti PWV, pridobljene z radiosondažo, z opazovanji GPS ali opazovanji s fotometrom. Odstopanja v vrednostih PWV za katerikoli par instrumentov so normalno porazdeljena, kar pomeni, da v podatkih PWV ni sistematičnih pogreškov. Relativne razlike med vrednostmi PWV, pridobljenimi z radiosondažo in opazovanji GPS, so najmanjše, nekoliko večje so razlike med vrendostmi, pridobljenimi z radiosondažo in fotometrijo, največje razlike pa so med vrednostmi, pridobljenimi z opazovanji GPS in radiosondažo. Študija je zanimiva za spodbujanje uporabe sprejemnikov GPS (GNSS) in fotometrov za določanje vrednosti PWV namesto radiosondaže, saj takšna opazovanja omogočajo tudi visoko časovno ločljivost.

Keywords

intercomparison;precipitable water vapour;sunphotometer;GPS;radiosonde;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FGG - Faculty of Civil and Geodetic Engineering
UDC: 528.28
COBISS: 45267459 Link will open in a new window
ISSN: 0351-0271
Views: 139
Downloads: 38
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Other data

Secondary language: Slovenian
Secondary title: Primerjava vsebnosti vodne pare v stolpcu zraka na podlagi radiosondaže ter opazovanj GPS in fotometra
Secondary abstract: The atmospheric precipitable water vapour (PWV) plays a crucial role in the hydrological cycle and energy transfer on a global scale. Radiosonde (RS), sunphotometer (SP) and GPS (as well as broader GNSS) receivers have gradually been the principal instruments for ground-based PWV observation. This study first co-locates the observation stations configured the three instruments in the globe and in three typical latitudinal climatic regions respectively, then the PWV data from the three instruments are matched each other according to the observing times. After the outliers are removed from the matched data pairs, the PWV intercomparisons for any two instruments are performed. The results show that the PWV estimates from any two instruments have a good agreement with very high correlation coefficients. The latitude and climate have no significant influence on the PWV measurements from the three instruments, indicating that the instruments are very stable and depend on their performance. The PWV differences of any two instruments display the normal distribution, indicating nonsystematic biases among the two PWV datasets. The relative differences between SP and GPS are the smallest, the middle between SP and RS, and those between GPS and RS are the largest. This study will be useful to promote GPS (GNSS) and SP PWV to be a substitute for RS PWV as a benchmark because of their high temporal resolutions.
Secondary keywords: primerjava;vsebnost vodne pare v stolpcu zraka;fotometer;GPS;radiosondaža;
Type (COBISS): Scientific work
Pages: str. 562-577
Volume: ǂLetn. ǂ64
Issue: ǂšt. ǂ4
Chronology: 2020
DOI: 10.15292/geodetski-vestnik.2020.04.562-577
ID: 13805864