Using Urban Climate Modelling to Support Climate Change Adaptation - - PowerPoint PPT Presentation

Using Urban Climate Modelling to Support Climate Change Adaptation in Small- to Medium-sized Cities in Austria

Stefan Guggenberger Municipal Authority of the City of Klagenfurt on lake Wörthersee Department for Climate and Environmental Protection stefan.guggenberger@klagenfurt.at

www.adapt-uhi.org

Abteilung Klima- und Umweltschutz

Klagenfurt

8/7/2019 Stefan Guggenberger, BSc 2

• appx. 1500

km

Abteilung Klima- und Umweltschutz

Klagenfurt on lake Wörthersee

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• 100,000 inhabitants
• 160,000 daytime population
• 120 km2
• Capital of Province of Carinthia
• Trade and school center of the region
• Center quite densly populated
• Forests and agricultural land

Abteilung Klima- und Umweltschutz

Challenges due to climate change

• Alpine regions are more afgected by climate change than the global

average

• Changes in the vegetation
• Domestic tree species sufger from heat and drought stress
• Water availability during heat waves
• Extreme weather events
• Although the annual precipitation decreases, the intensity of precipitation increases
• Hailstorm
• Heat waves and periods of drought
• Demographic challenges
• City is growing, average age increases

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Abteilung Klima- und Umweltschutz

Urban Heat Islands

Heat islands in the city are seen in Klagenfurt as one of the main problems of the urban climate. The urban climate deviates from the climatic conditions of the surrounding area, in particular because it has higher temperatures. These heat islands are defjned by the temperature difgerence between land and city (Brandenburg et. al 2015:

• p. 7).

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Brandenburg et. al 2015

BASS ET AL 2002: S. 5

Abteilung Klima- und Umweltschutz

ADAPT-UHI

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Title: Using Urban Climate Modelling to Support Climate Change Adaptation in Small- to Medium- sized Cities in Austria Simulation of urban heat islands (UHI) in the cities of Klagenfurt, Mödling and Salzburg. Simulation of climate change adaptation measures taking into account the IPCC scenarios. Assistance of decision-making and planning of adaptation measures.

ADAPT- UHI

Austrian Climate Research Programme 2017 Duration: 2 years (03/2018 – 03/2020) T

• tal costs: 249.936€

Consortium:

IIASA – International Institute for Applied Systems Analysis UBA – Environmental agency Austria ZAMG – Central Institute of Meteorology and Geodynamics IPAK – International Projekt Management Agency Klagenfurt Pilot cities: Klagenfurt, Salzburg, Mödling

Abteilung Klima- und Umweltschutz

Methodology

8/7/2019 Stefan Guggenberger, BSc 7 Status Parameter Input dataset  Orography Klagenfurt  Land use classes URBAN ATLAS + LISA  Building shape LISA, Klagenfurt  Building hight DKM_GEBAEUDE  Wall area index LISA  Soil surfaces COPERNICUS: paved areas, LISA    Tree height Stem height Tree cover T ree cataster Klagenfurt COPERNICUS: tree cover density LISA  Vegetation LISA  Vegetation height Klagenfurt Green roof potential  Blue areas LISA, Klagenfurt

Abteilung Klima- und Umweltschutz

Methodology

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Abteilung Klima- und Umweltschutz 8/7/2019 Stefan Guggenberger, BSc 9

Abteilung Klima- und Umweltschutz

Valid?

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Station 1981-2010 Measureme nt Modell Bias KGF Airport 54.6 54.2

• 1%

T ainach - Niederdorf 51.6 54.5 +5%

Average amount of summer days (>25°C) 1981-2010

Abteilung Klima- und Umweltschutz

Future Scenarios

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1971- 2000 2021- 2050 2071- 2100

RCP 8.5 RCP 4.5

min.: 1.5 max.: 78.2 mean: 38.1 min.: 5.8 max.: 98.0 mean: 55.7 min.: 9.0 max.: 108.3 mean: 65.6 min.: 5.7 max.: 99.1 mean: 56.0 min.: 24.5 max.: 131.8 mean: 92.5

Mean annual number of summer days (Tmax ≥ 25 °C)

Abteilung Klima- und Umweltschutz

City Development

8/7/2019 Stefan Guggenberger, BSc 12

• Increasing the albedo afgects the microclimate

better than green areas.

• Green areas, however, convince with

arguments such as water retentions and biodiversity .

• Ideal for the future would be a combination of

green areas, bright surfaces and trees.

Abteilung Klima- und Umweltschutz

Benefjts of the project

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Attention and awareness to climate change and urban heat islands Identifying heat islands in Klagenfurt now and in the future Development of accurate adaptation measures on the basis of the simulations Argumentation base in the discussion with stakeholders