the seasonal dependency of the urban heat island of cities in belgium with cclm/tu
Post on 20-Jul-2015
97 Views
Preview:
TRANSCRIPT
16/07/2014
The seasonal dependency of the
urban heat island of cities in Belgium with CCLM/TUHendrik Wouters, Matthias Demuzere, Koen De Ridder, Nicole van Lipzig Meteoclim 2014
16/07/2014 3© 2014, VITO NV
Urban expansion!
16/07/2014 4© 2014, VITO NV
Urban expansion!
figure from Poelmans and Van Rompaey., 2009
16/07/2014 5© 2014, VITO NV
Urban expansion!
figure from Poelmans and Van Rompaey., 2009
16/07/2014 6© 2014, VITO NV
Large modifications in the Earth’s landscape
» Drastic local climate changes…. Higher local temperatures!
-> Urban heat island
» Two processes:
16/07/2014 7© 2014, VITO NV
Large modifications in the Earth’s landscape
» Drastic local climate changes…. Higher local temperatures!
-> Urban heat island
» Two processes:
1 2
16/07/2014 8© 2014, VITO NV
²
Trapped infrared radiation
sensible heat
stored
efficiently
by building
materials
atmosphere
sensible heat
atmosphere
Stored in ground
Very hot surface!!
Trapped solar radiation
Dry surface: no evaporation
Efficiënt conversion
16/07/2014 9© 2014, VITO NV
Excess
release
during the
night
Large heat
Storage
In buildings
atmosphere
Stored in ground
Hot Surface is cooling
sensible heat
atmosphere 1
16/07/2014 10© 2014, VITO NV
2. Human activity
16/07/2014 11© 2014, VITO NV
2. Human activity -> heat emission
Energy converted to heat -> emitted to the atmosphere! 2
16/07/2014 12© 2014, VITO NV
Urban heat island… Big deal?
» Prolongued growing season
» More agreable temperaturetemperaturen
» Infrastructure
16/07/2014 13© 2014, VITO NV
» energieconsumption (air-co)
» infrastructure
» (Sports) Events
» Air quality
» More casualties in citiesversus natural surroundingsduring heat waves
Urban heat island… Big deal?
16/07/2014 14© 2014, VITO NV
+ Global climate change!
16/07/2014 15© 2014, VITO NV
» 1. Which of the processes and contribute the most to the urban heat-island of cities in and around Belgium?
» 2. Is there a seasonal dependency?
Research questions
21
16/07/2014 16© 2014, VITO NV
Why do we care?
» To know which policies are important to keep cities livable, sustainable, and resilient as much as possible!
livable
smart
cities
16/07/2014 17© 2014, VITO NV
How?
» We adapt the regional climate model CCLM to take account for
» by including the processes and
» Applicable for both summer as for winter
» as efficiënt as possible (cfr. Computational cost, needed input parameters)
21
16/07/2014 18© 2014, VITO NV
Regional climate model? 2 components.
Landoppervlakmodel
Atmospheric model
Sensible heat,
Evapo(transpi)ration,
Upward radiation
Drag on the wind
Temperature,
Precipitation,
Wind,
Downward radiation
16/07/2014 19© 2014, VITO NV
Regional climate model? 2 components.
Land-surface model
Atmospheric model
Wouters et al., (2012). Comprehensive parametrization of surface-layer transfer
coefficients for use in atmospheric numeric models. Boundary-layer Meteorology
Wouters et al., The impact of impervious water-storage parametrization
on urban climate modelling. Urban Climate (under revision)
21
Sensible heat,
Evapo(transpi)ration,
Upward radiation
Drag on the wind
Temperature,
Precipitation,
Wind,
Downward radiation
16/07/2014 20© 2014, VITO NV
Model configuration
Global weather forecasts from ECMWF
resolution:12.5 km
Regional climate model CCLM
resolution: 2.8 km
16/07/2014 21© 2014, VITO NV
Measurements urban heat island
» Antwerp
Antwerp
“Aren’t we a
bunch of
modelers?”
16/07/2014 22© 2014, VITO NV
Urban heat island of Antwerp
16/07/2014 23© 2014, VITO NV
Urban heat island of Antwerp
» Mid-summer
21/07/2012 -> 21/08/2012
» Mid-winter
21/01/2013 -> 21/02/2013
Uur van de dag
16/07/2014 24© 2014, VITO NV
Urban heat island of Antwerp
Uur van de dag
21
» Mid-summer
21/07/2012 -> 21/08/2012
» Mid-winter
21/01/2013 -> 21/02/2013
16/07/2014 25© 2014, VITO NV
Urban heat island of Antwerp
» Mid-summer
21/07/2012 -> 21/08/2012
» Mid-winter
21/01/2013 -> 21/02/2013
Uur van de dag
21
16/07/2014 26© 2014, VITO NV
Urban heat island of Antwerp
» Mid-summer
21/07/2012 -> 21/08/2012
» Mid-winter
21/01/2013 -> 21/02/2013
Uur van de dag
21
16/07/2014 27© 2014, VITO NV
Effect of heat emission in the city?
» Mid-summer
21/07/2012 -> 21/08/2012
» Mid-winter
21/01/2013 -> 21/02/2013
Uur van de dag
21
16/07/2014 28© 2014, VITO NV
Effect of heat emission in the city?
» Mid-zomer
21/07/2012 -> 21/08/2012
» Mid-winter
21/01/2013 -> 21/02/2013
Uur van de dag
16/07/2014 29© 2014, VITO NV
Effect heat emission in the city?
» Mid-zomer
21/07/2012 -> 21/08/2012
» Mid-winter
21/01/2013 -> 21/02/2013
Uur van de dag
16/07/2014 30© 2014, VITO NV
geen stedelijke opbouw
anthropogene warmte
mid-summer
midnight
(averaged)
21 21
21
16/07/2014 31© 2014, VITO NV
mid-summer
midnight
(averaged)
21 21
2121
16/07/2014 32© 2014, VITO NV
mid-summer
midnight
(averaged)
21 21
2121
21
21
16/07/2014 33© 2014, VITO NV
mid-summer
midnight
(averaged)
21 21
2121
21
21
16/07/2014 34© 2014, VITO NV
mid-summer
midnight
(averaged)
21 21
2121
21
21 21
16/07/2014 35© 2014, VITO NV
stedelijke opbouw energieverspilling interactie
mid-summer
midnight
21 21 21
16/07/2014 36© 2014, VITO NV
+ +
=
totale impact
mid-summer
midnight
21 21 21
21
urban structure interactionenergy waste
16/07/2014 37© 2014, VITO NV
+ +
=
totale impact
Values for Brussels
1.97°C 0.68°C -0.21°C
2.44°C
mid-summer
midnight
21 21 21
21
urban structure interactionenergy waste
16/07/2014 38© 2014, VITO NV
+ +
=
total impact
Values for Brussels
+0.41°C +1.20°C +0.25°C
+1.97°C
mid-winter
midnight
21 21 21
21
urban structure interactionenergy waste
16/07/2014 39© 2014, VITO NV
Conclusions
» Both , as well as their determine the urban heat-island intensity of cities in Belgium, and their respective contributionsstrongly depend on the season
» Both positive as negative influences on the urban thermal comfort needsto be accounted for with regard to:
» Tempering urban heat during heat waves, versus cold waves
» Climate change (e.g. , …)
» (urban) land-use change
21 21
16/07/2014 40© 2014, VITO NV
Thank you for your attention!
livable
smart
cities
top related