MISTRALS International Conference, Marseille (France), Oct. 20-22 2015)
Written by Hamonou   
Wednesday, 29 April 2015 10:09

Last Updated on Wednesday, 27 May 2015 11:00
ChArMEx Science - Improving Air Quality simulations
Written by Hamonou   
Friday, 12 December 2014 16:21

ChArMEx shows how LIDAR measurements can improve air quality simulations

A team from LSCE and CEREA has recently published (http://www.atmos-chem-phys.net/14/12031/2014/acp-14-12031-2014.pdf) the results of a new experiment showing how a network of ground-based LIDARS can improve the forecasting of the concentration levels of fine particles (PM2.5 and PM10). Results show that the LIDAR data assimilation has improved PM10 concentration forecast by up to almost 10% for PM10 in France and Spain.


 LIDAR network

Their approach is based on the so-called data assimilation method which is commonly used for improving weather forecasting models. LIDAR observations are assimilated in the course of data production in order to improve air quality forecast. Using LIDAR measurement enables models to take into account the pollution that is transported at altitude as well as pollution locally emitted. It thus gives a more suitable constraint for improving the forecast.      

dust event assimil

The method has been tested during a major dust event (see image above) that occured during the ChArMEx/TRAQA campaign in July 2012. This was the first time ever that data assimilation was implemented in air quality model. The model was fed by the vertical distribution of aerosols obtained thanks to a network of 10 LIDARS (from the ACTRIS/EARLINET network and from CORSiCA) spread all over southern Europe.  

This work is part of the PhD thesis of Yiguo Wang who got a grant from CEA and EDF and was co-chaired by Patrick Chazette from LSCE and Karine Sartelet from  CEREA (EDF R&D et Ecole des Ponts Paris Tech).

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Last Updated on Friday, 12 December 2014 17:05
News from Eastern Mediterranean: boat emissions
Written by Hamonou   
Wednesday, 01 October 2014 10:38

News from the field: “end of the week” flavor

Today the TRANSEMED team investigates the air along the coastline close to ship cruiser platforms. First idea was to go on a hop-on hop-off cruise but we did not get the permission.


We decided to install the sampling device along the coastline downwind of ship comes and goes. We had to face with the rain, cigarette smokers who like looking at the horizon and the fishermen who defend their territory too.


Since then it has been raining. Meanwhile the on line instruments keep on the monitoring at the traffic site. Air pollutant concentrations show high variability. Traffic related VOC concentration can be sometimes as high as the ones recently collectedin a tunnel in Beirut (Lebanon), still within the TRANSEMED initiative.

Last Updated on Tuesday, 13 January 2015 16:12
News from Eastern Mediterranean - Sept. 25th
Written by Hamonou   
Monday, 29 September 2014 08:15
News from the field: Thursday September 25th

Today the TRANSEMED team continues its exploration of VOC emissions by sampling the headspace of gasoline and diesel emission samples.


The goal is to get the emission profile of fuel evaporation resulting from all fuel-related activities. Evaporation of VOCs (mostly alkanes and aromatics) commonly occurs during refueling of cars at gas stations, vehicle running (running losses) and car parking. Fuel samples have been collected in Istanbul area and are analyzed at the site in a shaded spot and sheltered from the wind in a way not to affect the on-line monitoring.*

Last Updated on Monday, 29 September 2014 08:26
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