Climate Change

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Presentation Climate Change

Climate change is a primary challenge for the Mediterranean area and for Tunisia. In order to develop adaptation strategies, it is necessary to develop scientific climate projections and to assess future climate trends.

The INM as an institution responsible of the study of the climate has elaborated an evaluation of future climate on the basis of the scenarios of the EURO-CORDEX Project, a selection of 14 Regional climate models was retained for two parameters, the temperature and precipitation. The time horizons are:

  • 2050: the period considered is 2021-2050
  • 2100: the period considered is 2070-2099

Temperature and total precipitation projections have been developed for two emission scenarios (the medium scenario RCP4.5 and the pessimistic scenario RCP8.5). The projections of the climate extremes indices were made for the pessimistic scenario RCP8.5. The spatial resolution of the models is 12.5Km.

In these projections the multi-model approach was adopted using the outputs of 14 regional models. The approach is based on using the results of several models to develop climate projections. This method takes into account the uncertainty on the structure of the different models, i.e. on the parametrization of the different physical and dynamic processes, which minimizes the uncertainty towards the results of the models while knowing that it is impossible that a single model is sufficient to account for all the situations.

The validity and scientific legitimacy of numerical climate models and their predictions of climate change are based on the confrontations between simulations and observed data. For validation, a long reliable series of observed data is essential. We used the series of the INM database (since 1950) for the validation of the different models used.

In addition, the outputs of regional climate models have a bias. To be able to use these outputs, a bias correction is essential. The INM observation series were used to make the corrections by the quantile-quantile method.

ACTUALITÉS

Cumulative rainfall (mm)_May 2022
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       May 2022 was marked by an increase in temperature in most regions of Tunisia.  The general average (27 main stations) averaged 23 degrees and was above the reference average… View
pollution at
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The temporal and spatial evolution of air pollutants in Tunisia for May 2022:

The monthly means of environmental pollutants at ground level, collected daily from the Sentinel-5P s… View
Cumulative rainfall April 2022 at the main stations
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      April 2022 was mostly stable due to the presence of high pressure on our country. However, some weather fluctuations of limited effectiveness covered our areas on some days a… View
 pluie mars 2022
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March 2022 was marked by a shift between stability in weather factors on some days and the passage of weather fluctuations of varying effectiveness on other days. The precipitation… View