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Séminaire : Preliminary results from SPIRIT measurement during the Morocco campaign, présenté par Chaoyang Xue

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The global climate change and air pollution are still our current challenges that need to be better predicted and improved based on scientific knowledge ...


Date -
Heure 10h30 - 11h30
Adresse

3 avenue de la recherche scientifique
45071 Orléans la Source
France

Contact
LPC2E

Résumé :

The global climate change and air pollution are still our current challenges that need to be better predicted and improved based on scientific knowledge. And climate forecast and air quality models need to be validated by the worldwide observations. Morocco located in North Africa, however, has very few reliable observations of the atmospheric chemical composition as well as its evolution.

In the framework of the European 2020 project MARSU (MARine atmospheric Science Unravelled: Analytical and mass spectrometric techniques development and application), a comprehensive field campaign providing measurements of various pollutants and meteorological parameters in north Morocco was conducted from middle September to middle October 2019. The infrared absorption spectrometer called SPIRIT (SPectromètre Infra-Rouge In situ Toute altitude) was used in the Altlas station (Ifrane) to quantify the concentrations of CO, NO2, CH4, and H2O.  And the intercomparison with other techniques was conducted.

Several pollution events with high CO concentrations up to 185 ppbv were observed. The possible reason for the pollution events was explored by correlation analysis between different species, and model simulations. Based on the 10-day backward trajectories obtained from the FLEXPART model, the wind was mainly from the North Atlantic Ocean. For instance, in the clean day of 21 Sept., the wind landed in south Morocco (Essaouira) and arrived at the ATLAS station via Morocco inland. However, in the polluted day of 12 Oct., the wind went through North Africa (mainly Algeria) before arrival at ATLAS, and perhaps the air mass got pollutants enriched during this process. Additionally, the forward mode of FLEXPART was used to reproduce the observed CO and NO2, which in turn will assess the performance of the inventory at regional scale.