Klimatološka analiza vertikalnih profila iz atmosferske reanalize ERA5 na području Hrvatske

master's thesis

• Title (english): Climatological analysis of vertical profiles from the atmospheric reanalysis ERA5 over Croatia
• Author: Dario Sušanj
• Mentor: Ivan Güttler (mentor)
• Mentor: Maja Telišman Prtenjak (komentor)
• Committee member: Ivan Güttler (predsjednik povjerenstva)
• Committee member: Maja Telišman Prtenjak (član povjerenstva)
• Committee member: Antun Marki (član povjerenstva)
• Committee member: Iva Dasović (član povjerenstva)
• Committee member: Zvjezdana Bencetić Klaić (član povjerenstva)
• Committee member: Josip Stipčević (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Geophysics); Zagreb
• Defense date and country: 2024-02-29, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Geophysics; Meteorology and Climatology

Abstract

U radu je analizirano podudaranje temperature i relativne vlažnosti iz reanalize ERA5 sa stvarnim vrijednostima dobivenim mjerenjima pomoću radiosondaža. Analiza je provedena na 37 vertikalnih nivoa za područje Zagreba i Zadra, tijekom cijele godine te za zimsku i ljetnu sezonu i za podatke u ponoć, podne te njihov srednjak. Uspoređene su srednje vrijednosti i standardne devijacije za odabrano razdoblje uz popratne t-testove za srednje vrijednosti i F-testove za standardne devijacije uz nivo značajnosti od 5%. Dobiveno je jako dobro slaganje srednjih vrijednosti temperature te precjenjivanje relativne vlažnosti ERA5 na skoro svim vertikalnim nivoima zbog njene lošije prognoze. Promjenom lokacije, sezone ili doba dana rezultat je da jedino sezona primjetno utječe na vrijednosti i odnos između krivulja. Izračunate su i grafički prikazane anomalije temperature, relativne vlažnosti i specifične vlažnosti za cijelo dostupno razdoblje renalize ERA5 te je pokazano zagrijavanje troposfere i hlađenje stratosfere kao i porast specifične vlažnosti u zadnjem desetljeću. Prijelazom s cijele godine na odabrane sezone, pozitivne i negativne anomalije postaju intenzivnije. Također su analizirani i prikazani trendovi temperature, relativne vlažnosti i specifične vlažnosti za podatke iz reanalize ERA5 s vrijednostima po dekadama uz pripadajuće t-testove. Dobiveni trendovi temperature i specifične vlažnosti su značajni za skoro sve vertikalne nivoe, dok za relativnu vlažnost većinom nisu bili statistički značajni.

Abstract (english)

In the thesis the comparison between temperature and relative humidity from ERA5 reanalysis with actual values obtained from radiosonde measurements was analysed. The analysis was conducted at 37 vertical levels for the Zagreb and Zadar regions throughout the year, as well as for the winter and summer seasons, considering data at midnight, noon, and their averages. Mean values and standard deviations were compared for the selected period, with accompanying t-tests for mean values and F-tests for standard deviations at a significance level of 5%. A strong match was found for the mean temperature values, while ERA5 exceeded the relative humidity for almost all vertical levels due to its lower predictability. When changing location, season, or time of day, the results showed that only the season noticeably affected the values and the relationship between curves. Anomalies of temperature, relative humidity, and specific humidity were calculated and graphically represented for the entire available ERA5 period, demonstrating tropospheric warming, stratospheric cooling, and an increase in specific humidity in the last decade. Transitioning from the entire year to selected seasons intensified positive and negative anomalies. Trends in temperature, relative humidity, and specific humidity for ERA5 data were also analyzed, presented with values per decade along with corresponding t-tests. Significant trends were observed for temperature and specific humidity for almost all vertical levels, while trends for relative humidity were mostly statistically insignificant.

• Keywords: reanaliza; radiosondaža; temperatura; relativna vlažnost; specifična vlažnost; anomalije; trendovi
• Keywords (english): reanalysis; radiosondage; temperature; relative humidity; specific humidity; anomalies; trends
• Language: croatian
• URN:NBN: urn:nbn:hr:217:959554
• Study programme: Title: graduate academic research programme: Master of Physics – geophysics, modules: Seismology and solid Earth physics, Meteorology and physical oceanography; specializations in: Seismology and solid Earth physics, Meteorology and physical oceanography; Course: Meteorology and physical oceanography; Study programme type: university; Study level: graduate; Academic / professional title: sveučilišni magistar fizike – geofizike (sveučilišni magistar fizike – geofizike)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-03-04 14:39:09