Analysis of 2016 December pollution episode over IDF

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Transcription de la présentation:

Analysis of 2016 December pollution episode over IDF Meteorological conditions : anticyclonic conditions driving to stable to very stable situations PM10, concentrations moyennes horaires des stations AIRPARIF A strong pollution event in a context of reduction (decreasing trends) of PM means and peaks in IDF. alerte information Roissy 29/11 01/12 03/12 05/12 07/12 UPD SIRTA Ceilometer transect

Aerosol Mass / Size Distribution / Number PM SIRTA (FIDAS) PM Gennevilliers (TEOM) µg.m-3 µg.m-3 Higher mass at urban sites / periurban sites with good temporal correlations between sites Short differences between PM10/PM25/PM1 mass Local pollution event (cf also primary fraction)

Aerosol composition (ACSM) PM1 SIRTA (ACSM) PM1 Gennevilliers (ACSM) µg.m-3 µg.m-3 AE33+TEOM (SIRTA) Organic fraction dominates (large urban/periurban gradient) – primary fraction dominates Significant nitrate concentrations ( not that different between urban and suburban sites)

Aerosol composition (Filters) Filtres Filtres Consistent with ACSM measurements Large spatial gradients for Organic Matter and Nitrate fractions !?

Multi site BC observations : aethalometers + filters (not presented here, 4 to 5 more sites) µg.m-3

Source attribution using multiwavelenghts aethalometers (AE33) : Fossil fuel / Wood burning BC Fossil Fuel BC Wood Burning FF/WB A1 highway FF/WB SIRTA

Analysis ?? Temporal variability of BC and WB ? Source attribution using multiwavelenghts aethalometers (AE33) : Fossil fuel / Wood burning BC Fossil Fuel BC Wood Burning Analysis ?? Temporal variability of BC and WB ? Behavior of FF and WB (and FF/WB ratio) as a function of site type : what do we learn ? What use ? For models ? Emission calibration ? FF/WB A1 highway FF/WB SIRTA

Conclusion / Perspectives Size distribution (FIDAS, GRIMM, LOAC) / Number (SMPS, …) to be analyzed Also analysed metals, levoglucosan, HAP, PO  caractérisation of sources (also station representativity) and health impacts Model evaluation Analysis of spatial gradients using models and meteorological analysis (back-tarjectories …) Local / Regional sources quantifications and sensitivity tests to sources

Quelques actions d’OCAPI : EPPI (LEFE-CHAT) Etude de la Pollution Particulaire en Ile-De-France (cas de Décembre 2016) PM10, concentrations moyennes horaires des stations AIRPARIF alerte information 29/11 30/11 01/12 02/12 03/12 04/12 05/12 06/12 07/12 Les conditions météorologiques synoptiques contrôlent les concentrations via l’intensité du vent et la hauteur de couche limite

Quelques actions d’OCAPI : EPPI (LEFE-CHAT) Etude de la Pollution Particulaire en Ile-De-France (cas de Décembre 2016) PM10, concentrations moyennes horaires des stations AIRPARIF alerte information Roissy 29/11 01/12 03/12 05/12 07/12 UPD SIRTA Les conditions météorologiques synoptiques contrôlent les concentrations via l’intensité du vent et la hauteur de couche limite Transect télémètres

Quelques actions d’OCAPI : EPPI (LEFE-CHAT) Analyse de la composition chimique des particules PM1 ACSM (SIRTA) AE33+TEOM (SIRTA) µg.m-3 ineris Filtres Filtres Episode dominé par la matière organique; une importante fraction de particules primaires Des gradients importants au sein de l’agglomération.