|Sector||Heat stress and human comfort|
|Description||Tropical nights are nights when minimum 2 m air temperature remains greater than 20° C (e.g. Fischer and Schär 2010).|
|End User||General public|
|tropicalnights||Tropical Nights||yearly||Number of days with daily minimum temperature greater than 20°C.||nights||20°C|
|Provenance||Computed by the HARMONIE model.|
|Validation||The simulations made by HARMONIE-AROME in Urban SIS has been validated against observations in Urban SIS deliverable 5.1, where an overview is given in Table 4.|
This indicator has been shown, in combination with hot days (indicator id: hotdays), to explain temporal and spatial variance of excess mortality during recent European heatwaves (e.g. Fischer and Schär 2010). The temperature threshold used to identify a tropical night that is used follows EEA (2009).
The indicator “Tropical nights” is meant as an intuitive way to present high temperatures occurrences for the public.
EEA Report No 5/2009. Ensuring quality of life in Europe’s cities and towns – tackling the environmental challenges driven by European and global change. ISSN 1725-9177
Fischer EM, C Schär 2010: Consistent geographical patterns of changes in high-impact European heatwaves. Nature Geoscience 3.6: 398-403.