Nucleation : airborne measurements (ATR-42) 4th International Workshop Charmex Anaïs Culot

ERSA MAJORCA SAF-Med 2013 Marchand Pey

- N 3-10 = Concentration of particles between 3 – 10 nm - More particles near the coast - More particles at high altitude (3400 m) than in BL (215 m) Event July 30: N3-10nm Backward trajectories : Air masses from the continent before reaching Ersa/plane Nucleation advected from the continent

Event July 30: larger particles in the nucleation mode - More particles near the coast (in blue) - No growth of the N 3-10 nm particles beyond 20 nm during the flight Diameter (nm) dN/dlog(dp)

Event August 1 : N3-10 nm - Low altitude : 500 m - High concentrations all along the flight Backward Trajectories : - North / Northeast origin - Air masses flew over Ersa before reaching the airplane

Event August 1 : larger particles in the nucleation mode -Distinct growth of small particles in Ersa - Ultrafine particles also detected in the plane ERSAATR

- Decrease of the nucleation mode diameter when the plane moves away from Ersa - Concentrations of nucleation mode roughly steady Event August 1 Nucleation mode « alimented » by new particles which were too small to be measured by the SMPS in Ersa : nm particles measured - Deacreasing of the diameter of the particles in the plane FNP above the sea MODE Nuc MODE AitkenMODE Acc

Flight No.DateObjectiveC-ToF-AMSSMPSCPC 5 nmCPC 10 nm Nucléation Flight 1529/06/14Pollution Flight 1630/06/14BiogenicLow troposphere (Inf 1000m) Flight 1701/07/14Pollution Flight 18 & 19 02/07/14PollutionHigh Altitude ( ) Flight 2003/07/14Biogenic- Flight2105/07/14BiogenicHigh altitude (3000) Flight 2206/07/14Pollution Flight 2308/07/14BiogenicAlt et BL Flight 2408/07/14Pollution Flight 2610/07/14MarineLow altitude Faulty data. (For the AMS: Mainly high altitude measurements so instrument was close to the detection limit approx 90% of the time.) Data OK. Preliminary analysis performed SAF-Med 2014

High concentrations of fine particles Marine flight

N 5-10nmN20-50nm Marine flight

Nucleation particles more concentrated between m Layer correlated with high concentrations of organics N5-10 nm Vertical sonding

Conclusions - Nucleation events measured by the plane : ground station during favorable periods for the process. - Large spatial extension on the North-West Mediterranean basin - Ultrafine Particules (3-10 nm) detected at high altitude but low growth - In Marine Boundary Layer, it seems that a transport of small particles from the continent overlaps with nucleation above the sea - Correlation between organics and ultrafine particles at m

Event August 1 : N3-10 nm Perspectives Gaseous precursors (PTR-MS) DMS?