Different development of global warming (GW) and urban heat island (UHI) in the city of Zagreb

Bonacci, Ognjen (author), Vrsalović, Adrijana (author), Roje-Bonacci, Tanja (author)

The analysis examines various impacts of global warming (GW) and urban heat island (UHI) effects at four meteorological stations in and around Zagreb, Croatia, spanning from 1981 to 2021. The goal was to determine the intensity and causes of the different warming tendencies and behaviour of air temperature variations observed in various parts of Zagreb. Data from four meteorological stations were analysed: Grič (GR) – a hill within the city area, Maksimir (MA) – an urbanized suburban area, Pleso (PL) – a suburban area unaffected by intense urbanization (airport), and Puntijarka (PU) – atop of Mt. Medvednica. Various statistical methods were applied to analyse trends and variations in annual, monthly, and daily air temperature indices (ATI), including linear regression, the Mann–Kendall test, the day-to-day variability method (DTD), and diurnal air temperature range (DTR) method. All stations showed increasing trends in all ATI. At the PU station, the trend is solely due to GW; at others, both UHI and GW contribute. The MA station exhibits the most pronounced UHI. DTD variability decreases at all stations. GR sees an increasing DTR trend, while PU's trend is decreasing. No DTR trends were observed at the other two stations. Overall, ATI variations are similar, but each location's behaviour differs due to its unique local environment.

• Language: English
• Keywords: global warming, urban heat island, air temperature trend, day-to-day air temperature variability, diurnal air temperature range, Zagreb City
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2023
• Number of pages: Str. 155-176
• Numbering: Vol. 36, no. 65
• PID: 20.500.12556/RUL-163206
• UDC: 502.3:504.7(497.521. 2)
• ISSN on article: 0352-3551
• DOI: 10.15292/acta.hydro.2023.10
• COBISS.SI-ID: 210279683
• Publication date in RUL: 04.10.2024

Record is a part of a journal

• Title: Acta hydrotechnica
• Publisher: Fakulteta za gradbeništvo in geodezijo
• ISSN: 0352-3551
• COBISS.SI-ID: 3664386

Licences

• License: CC BY-NC-SA 4.0, Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Description: A Creative Commons license that bans commercial use and requires the user to release any modified works under this license.

Secondary language

• Language: Slovenian
• Title: Različen razvoj globalnega segrevanja (GS) in mestnega toplotnega otoka (UHI) v mestu Zagreb

Abstract

Analiza preučuje različne vplive učinkov globalnega segrevanja (GW) in mestnega toplotnega otoka (UHI) na štirih meteoroloških postajah v Zagrebu in okolici (Hrvaška) v obdobju od leta 1981 do 2021. Cilj je ugotoviti intenzivnost in vzroke za različne težnje segrevanja in obnašanje spreminjanja temperature zraka v različnih delih mestnega območja Zagreba. Analizirani so podatki s štirih meteoroloških postaj: Grič (GR) – mestno središče, Maksimir (MA) – urbanizirano primestno območje, Pleso (PL) – primestno območje, neprizadeto zaradi intenzivne urbanizacije (letališče), in Puntijarka (PU) – na vrhu planine Medvednica. Za analizo trendov in sprememb letnih, mesečnih in dnevnih indeksov temperature zraka (ATI) so bile uporabljene različne statistične metode, vključno z linearno regresijo, Mann-Kendallovim testom, metodo dnevne variabilnosti (DTD) in razponom dnevne temperature zraka (DTR). Vse postaje so pokazale naraščajoče trende pri vseh ATI. Na postaji PU je trend izključno zaradi GW; pri drugih prispevata tako UHI kot GW. Postaja MA kaže najbolj izrazit UHI. Spremenljivost DTD se zmanjša na vseh postajah. Pri postaji GR je naraščajoči trend DTR, medtem ko se ta trend pri postaji PU zmanjšuje. Na drugih dveh postajah ni bilo opaziti nobenih trendov. Na splošno je spreminjanje ATI podobno, a obnašanje se na vsaki lokaciji razlikuje zaradi edinstvenega lokalnega okolja.

• Keywords: lobalno segrevanje, mestni toplotni otok, trend temperature zraka, spremenljivost dnevne temperature zraka, razpon dnevne temperature zraka, mesto Zagreb