Analiza prisotnosti vodne pare v ozračju iz opazovanj GNSS

diplomska naloga

Tina Lombar (Author), Bojan Stopar (Mentor), Samo Drobne (Thesis defence commission member), Dušan Petrovič (Thesis defence commission member), Oskar Sterle (Co-mentor)

Abstract

Keywords

geodezija;TUN;diplomska dela;VSŠ;GNSS meteorologija;troposferska refrakcija;vodna para;opazovanje prisotnosti vodne pare v zraku;

Data

Language:	Slovenian
Year of publishing:	2013
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FGG - Faculty of Civil and Geodetic Engineering
Publisher:	[T. Lombar]
UDC:	528.2:551.507:551.57(043.2)
COBISS:	6315361
Views:	1727
Downloads:	499
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Monitoring of atmospheric water vapor by the analiysis of GNSS observations
Secondary abstract:	The graduation thesis analyses the possibilities of usage of GNSS technology for observing the presence of water vapor in the air. Water vapor causes the delay of signals propagating from GNSS sattelites to ground-based GNSS receivers. We call that tropospheric refraction. We can estimate this delay pretty well and connect it with the height of the water column. Researches showed, that that way we can produce data, that are used by meteorologists for weather observation and weather forecasts. With the experiment, we checked, whether there is a connection/correlation between zenith wet delay, estimated with GNSS gathered data and meteorological data of presence of water vapor. The distribution of water vapor is closely connected to the distribution of clouds and rainfall. First, we compared graphical presentation of data on distribution of water vapor, collected with GNSS on the area of Slovenia, with the rainfall radar picture. It proved that we can't compare those data and that the connection between water vapor and rainfalls is not that simple. Then we also compared GNSS observation of water vapor with meteorological calculation of water vapor density. Results of statistical analysis showed, that there is a middle to strong connection between both types of data. Results of the researches and analysis that were done abroad show, that GNSS analysis of presence of water vapor, along with cooperation of experts from both, geodesy and meteorology, could maybe become useful as a replacement tool for meteorological observations, or at least an improvement or completion of them.
Secondary keywords:	graduation thesis;geodesy;TUN;GNSS meteorology;tropospheric refraction;water vapor;observing presence of water vaporin the air;
File type:	application/pdf
Type (COBISS):	Bachelor thesis/paper
Thesis comment:	Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Pages:	XII, 46 str., 2 pril.
Type (ePrints):	thesis
Title (ePrints):	Monitoring of atmospheric water vapor by the analysis of GNSS observations
Keywords (ePrints):	GNSS meteorologija;troposferska refrakcija;vodna para;opazovanje prisotnosti vodne pare v zraku
Keywords (ePrints, secondary language):	GNSS meteorology;tropospheric refraction;water vapor;observing presence of water vapor in the air
Abstract (ePrints):	Diplomska naloga preučuje možnosti uporabe tehnologije GNSS za ugotavljanje prisotnosti vodne pare v zraku. Zaradi vodne pare v ozračju pride do zakasnitve signala na poti od oddajnika do sprejemnika, kar imenujemo troposferska refrakcija. To zakasnitev lahko zelo dobro ocenimo in jo povežemo z vsebnostjo vodne pare v stolpcu zraka. Študije kažejo, da lahko na ta način in s primerno obdelavo podatkov zagotavljamo podatke, ki jih uporabljajo meteorologi za opazovanje vremena in vremenske napovedi. Na konkretnem primeru smo preverili, ali obstaja povezava med vrednostmi mokre komponente troposferske refrakcije, zaznanimi z metodo GNSS, in meteorološkimi opazovanji prisotnosti vodne pare. Razporeditev vodne pare vpliva na razporeditev oblakov in padavin. Najprej smo podatke GNSS- opazovanj o količini vodne pare, zbranih na območju celotne Slovenije, interpolirali in izrisali ter izris primerjali z radarsko sliko padavin. Izkazalo se je, da teh rezultatov ne moremo primerjati in da podatka o količini vodne pare ne moremo tako enostavno povezati s podatki o padavinah. Primerjali smo tudi GNSS-opazovanja prisotnosti vodne pare z meteorološkim izračunom gostote vodne pare na eni točki. Rezultati statistične obdelave so pokazali, da med podatki obstaja srednja do močna povezanost. Rezultati lastne analize in podatki študij v tujini kažejo, da bi lahko tak način analize prisotnosti vodne pare ob sodelovanju strokovnjakov s področja geodezije in meteorologije prišel v uporabo namesto meteoroloških opazovanj, zagotovo pa bi jih lahko vsaj izboljšal ali dopolnil.
Abstract (ePrints, secondary language):	The graduation thesis analyses the possibilities of usage of GNSS technology for observing the presence of water vapor in the air. Water vapor causes the delay of signals propagating from GNSS sattelites to ground-based GNSS receivers. We call that tropospheric refraction. We can estimate this delay pretty well and connect it with the height of the water column. Researches showed, that that way we can produce data, that are used by meteorologists for weather observation and weather forecasts. With the experiment, we checked, whether there is a connection/correlation between zenith wet delay, estimated with GNSS gathered data and meteorological data of presence of water vapor. The distribution of water vapor is closely connected to the distribution of clouds and rainfall. First, we compared graphical presentation of data on distribution of water vapor, collected with GNSS on the area of Slovenia, with the rainfall radar picture. It proved that we can't compare those data and that the connection between water vapor and rainfalls is not that simple. Then we also compared GNSS observation of water vapor with meteorological calculation of water vapor density. Results of statistical analysis showed, that there is a middle to strong connection between both types of data. Results of the researches and analysis that were done abroad show, that GNSS analysis of presence of water vapor, along with cooperation of experts from both, geodesy and meteorology, could maybe become useful as a replacement tool for meteorological observations, or at least an improvement or completion of them.
Keywords (ePrints, secondary language):	GNSS meteorology;tropospheric refraction;water vapor;observing presence of water vapor in the air
ID:	8312971