Urban Heat Island or Urban Heat Bubble?

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From this document you will learn the answers to the following questions:

  • What did the researchers expect to see in the study area?

  • What is the standard deviation between data loggers in the nest and synoptic measurements?

  • What is the main reason for the difference between minima and maxima?

Transcription

1 Urban Heat Island or Urban Heat Bubble? Sergio Buricelli, Renato R. Colucci, Paolo Galluccio, Riccardo Milocco, Luigi Molinari, Cristian Noacco, Sergio Nordio, Gianluca Pistrin, Furio Pieri, Roberto Stampetta, Alberto Villani feat Fulvio Stel Unione Meteorologica del Friuli Venezia Giulia - ONLUS Regional Agency for Environmental Protection of Friuli Venezia Giulia ISMAR CNR Municipality of Udine Dept. for Environment (fulvio.stel@arpa.fvg.it)

2 Conclusions Even relatively small towns (roughly inhabitants) can experience a «heat island» effect «Heat island» effect is essentially observed in minimum temperatures (less in average temperatures) Maxima temperatures experience for small towns are more subject to a «Heat bubble» effect This is a «citizen science» experience carried out by volunteers with a reduced cost (roughly 3 ke) Some surprises sprung out as well

3 The study area

4 The study area

5 The study area

6 Monitoring strategy Use cheap data loggers to record temperature Deploy data loggers with a homogeneous micropositioning Record temperature every 15 for reasons of storage (~ 1 month) and time precision (good for temperature, not stable for time drifts) Compare data logger measurements with official synoptic monitoring station to evidence offsets related to the monitoring device Try to survive (e.g., UTC nightmare)

7 Monitoring infrastructure nests projected to be: effective shield to direct solar radiation easy to insert and extract loggers easy to orient northward cheap and discrete

8 Monitoring strategy D > 3 m D = 2.3 m Use urban light poles Far from walls Far from car parks Easy to find

9 Results West East Error bars are the standard deviation between data loggers in the nest and synoptic measurements

10 Results North South Error bars are the standard deviation between data loggers in the nest and synoptic measurements

11 Open questions (and tentative answers) Why difference between minima and maxima behavior? Minima are achieved through a radiative mechanism (laminar) Maxima are achieved through a convective mechanism (turbulent) MIN MAX

12 Open questions (and tentative answers) Why overestimation of temperature by synoptic station? There is a night cold pool development on a local river basin (blue area) Night breeze regime is from Northeast toward Southwest Northern part less windy (?)

13 Conclusions Even relatively small towns (roughly inhabitants) can experience a «heat island» effect «Heat island» effect is essentially observed in minimum temperatures (less in average temperatures) Maxima temperatures experience for small towns are more subject to a «Heat bubble» effect This is a «citizen science» experience carried out by volunteers with a reduced cost (roughly 3 ke) Thermal asymmetry in a symmetric situation and impacts on synoptic measurements

14 Thanks for your attention Благодаря

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