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Nucleation :airborne measurements
(ATR-42)
4th International Workshop Charmex
Anaïs Culot
ERSA
MAJORCA
SAF-Med 2013
MarchandPey
- 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
ERSA ATR
- 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 :
- 3-10 nm particles measured
- Deacreasing of the diameter of the particles in the plane
FNP above the sea
MODE Nuc MODE Aitken MODE Acc
Flight No. Date Objective C-ToF-AMS SMPS CPC 5 nm CPC 10 nm
Nucléation
Flight 15 29/06/14 Pollution
Flight 16 30/06/14 Biogenic Low troposphere(Inf 1000m)
Flight 17 01/07/14 Pollution
Flight 18 & 19
02/07/14 Pollution High Altitude (3000-3500)
Flight 20 03/07/14 Biogenic -
Flight21 05/07/14 Biogenic High altitude(3000)
Flight 22 06/07/14 Pollution
Flight 23 08/07/14 Biogenic Alt et BL
Flight 24 08/07/14 Pollution
Flight 26 10/07/14 Marine Low 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 5-10nmN20-50nmMarine flight
• Nucleation particles more concentrated between 1000-1300 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 1000-1300 m
Event August 1 : N3-10 nm
Perspectives
Gaseous precursors(PTR-MS)
DMS?
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