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Tropical Nights

Background Information

The Tropical Nights index is relevant to human health. This index is based on daily minimum temperature and is part of the Extreme Heat Hazard type of the Heat and Cold category of the classification.

High values of minimum temperature cause physiological discomfort during periods of high temperatures by preventing body temperature to cool-off during the night.

A higher value indicates more Tropical Nights and thus more stress on human health caused by extreme minimum temperatures.

Definition

The count of days when daily minimum temperature remains above 20°C (Number of days).

Data Sources

The data was assembled on behalf of the Copernicus Climate Change Service (C3S) based on climate projections hosted on the C3S Climate Data Store (CDS). The Index is calculated from a set of nine bias-corrected multi-model simulations from the EURO-CORDEX experiment. These simulations have a spatial resolution of 0.25° x 0.25°, a 3-hourly output, and cover scenarios RCP4.5 and RCP8.5. More information about the dataset can be found in the corresponding CDS documentation resources.

Supporting Information

Further information about this application can be found in the Product User Guide (PUG) of the application in the documentation resources of the CDS. Related information can also be found on other sections of the EEA site:

  • The Index based interactive EEA report: Heat and cold - extreme heat (link).

Data download

The aggregated data shown on the map can be downloaded as csv files.

Visualisation and Navigation

The application has an interactive map on the left side with a set of drop down menus to select the regions (NUTS, Transnational regions or Europe Zones), the time span (Year, Season or Month) and the emission scenario (RCP4.5 or RCP8.5). By clicking on the map, a scrolling panel appears on the right side displaying interactive plots corresponding to spatial and temporal averages over the selected region. Hover over the plots to see the values.

Some plots show an uncertainty envelope representing the range of likely values, as defined by the IPCC, based on an ensemble of models (see FAQ).


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