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?