Abstract
Based upon a ‘human-centred approach’, combinations of existing and new methodologies were applied to determine how Ankara’s morphological characteristics influenced the magnitude/frequency of Cold Stress (CS) and Heat Stress (HS) to detect/quantify seasonal and yearly human thermal stress frequency. To quantify these conditions upon the human biometeorological system, the Physiologically Equivalent Temperature (PET) was utilised by processing climatic variables from Ankara’s Meteorological Station (AMS). In situ assessments of human thermophysiological thresholds were undertaken within characteristic existing/future Urban Canyon Cases (UCCs), with a further stipulation of three interior Reference Points (RPs). Indoor PET values were moreover calculated within a stereotypical vulnerable residential dwelling. Seasonal frequencies revealed that winter PET values frequently ranged between 0.0 and − 19.9 °C, with corresponding summer values frequently ranging between 35.1 and 46.0 °C. Accounting for Ankara’s urban morphology, yearly frequency of No Thermal Stress remained at ~ 48%, CS remained at ~ 26%, and HS ~ 28%. HS varied the most between the eight evaluated Aspect Ratios (ARs). It reduced by up to 7.1% (114 min) within the Centre (RPC) area of UCCs with an orientation of 90°. Out of twelve orientations, the highest HS frequency took place between 105 and 135°. Including in UCC3.50, the frequency of HS almost always remained above 72% (2592 min).
Graphical Abstract
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Data availability
The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
Code availability
Not applicable.
Abbreviations
- ‘BSk’:
-
Cold semi-arid climate according Köppen-Geiger Classification (-)
- ‘Csa’:
-
Warm temperate with dry hot summer according Köppen-Geiger Classification (-)
- ‘Dsa’:
-
Snow/cold climate with dry/hot summer according Köppen-Geiger Classification (-)
- ‘Dsb’:
-
Snow/cold climate with dry/warm summer according Köppen-Geiger Classification (-)
- AR:
-
Aspect ratio (-)
- DP1 :
-
Diurnal period 1 (i.e. between 09:00 and 17:00) (-)
- DP2 :
-
Diurnal period 2 (i.e. between 12:00 and 15:00) (-)
- mPET:
-
Modified physiologically equivalent temperature (°C)
- MRTI :
-
Indoor mean radiant temperature (°C)
- MRTO :
-
Outdoor mean radiant temperature (°C)
- Oct:
-
Cloud cover (1/8)
- OR:
-
Orientation (°)
- PET:
-
Physiologically equivalent temperature (°C)
- PETI :
-
Indoor physiologically equivalent temperature (°C)
- PETL:
-
Physiologically equivalent temperature load (°C)
- PETO :
-
Outdoor physiologically equivalent temperature (°C)
- RHI :
-
Indoor relative humidity (%)
- RHO :
-
Outdoor relative humidity (%)
- RP# :
-
Reference Point (-)
- SVF:
-
Sky View Factor (0/1)
- Ta:
-
Air temperature (°C)
- TaI :
-
Indoor air temperature (°C)
- TaO :
-
Outdoor air temperature (°C)
- TgI :
-
Indoor globe temperature (°C)
- U-Value:
-
Thermal Resistance (W/m2k)
- UCC# :
-
Urban Canyon Case (-)
- V1.1I :
-
Indoor air speed at 1.1 m (m/s)
- V1.1O :
-
Outdoor wind speed at 1.1 m (m/s)
- VI :
-
Indoor air speed (m/s)
- VO :
-
Outdoor wind speed (m/s)
- VPI :
-
Indoor vapour pressure (hPa)
- VPO :
-
Outdoor vapour pressure (hPa)
- H/W:
-
Height-width-ratio (-)
- AMS:
-
Ankara’s Meteorological Station
- ASHRAE:
-
American Society of Heating, Refrigerating and Air-Conditioning Engineers
- CCDI:
-
Climate Change Detection Indices
- C:
-
Central (Pertaining to RP)
- CS#:
-
Cold Stress #
- CTIS:
-
Climate-Tourism/Transfer-Information-Scheme
- EBM:
-
Energy Based Model
- EHEs:
-
Extreme Heat Events
- FDD:
-
Frequency Distribution Diagram
- GCM:
-
Global Circulation Model
- HS#:
-
Heat Stress #
- ICDN:
-
Indoor Cooling Degree Necessity
- IPCC:
-
Intergovernmental Panel on Climate Change
- KGC:
-
Köppen-Geiger Classification
- KHS:
-
Kestrel Heat Stress
- LL:
-
Left Lateral (Pertaining to RP)
- MEMI:
-
Munich Energy-balance Model for Individuals
- MS:
-
Meteorological Station
- NTS:
-
No Thermal Stress
- NTSEXP :
-
No Thermal Stress Expanded
- RCM:
-
Regional Climate Model
- RCP:
-
Representative Concentration Pathways
- RL:
-
Right Lateral (Pertaining to RP)
- SDG:
-
Sustainable Development Goal
- PS:
-
Physiological Stress
- TÜBİTAK:
-
Scientific and Technological Research Council of Türkiye
- WMO:
-
World Meteorological Organisation
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Acknowledgements
The authors would like to extend their gratitude to Assoc. Prof. Dr. Onur Çalışkan from Ankara University for his initial support with the AMS climatic data acquisition.
Funding
This investigation was supported by the Scientific and Technological Research Council of Türkiye (TÜBİTAK) for the national research project [2236] funding, with the project grant number [120C077] – Obtained by A.N
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A.N + A. M—conceptualisation; data curation; formal analysis; funding acquisition (A.N); investigation; methodology; project administration; resources; software; validation; visualisation; writing/review. I.C—data curation; formal analysis; resources; software; validation; review. Y.A—investigation; project administration; review. All authors read and approved the final manuscript.
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Highlights
• Urban cold/heat stress evaluated within diverse urban morphological in situ settings.
• Present/future urban canyons studied to define thermophysiological stress frequency.
• Physiologically Equivalent Temperature used to assess thermal stress on human body.
• New methodical approach to identify local seasonal and yearly thermal stress frequency.
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Santos Nouri, A., Charalampopoulos, I., Afacan, Y. et al. Detection and quantification of seasonal human heat and cold stress frequencies in representative existing and future urban canyons: the case of Ankara. Theor Appl Climatol 153, 593–620 (2023). https://doi.org/10.1007/s00704-023-04482-5
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DOI: https://doi.org/10.1007/s00704-023-04482-5