1. INSTRUMENTATION DMPS – H-TDMA – CCN COUNTER –
DIFFERENTIAL MOBITY PARTICLE SIZER
H-TDMA –
HYGRSCOPIC TANDEM DMA
CCN COUNTER –
CLOUD CONDENSATION NUCLEI COUNTER
Humidifier
dry particles
wet particles
Measures diameter hygroscopic growth at sub-saturations:

2. New Lund H-TDMA now under construction
Active temperature control on both DMAs (excellent RH stability)
Closed-loop sheath air on both DMAs (no compressor needed)
Scanning DMA2 voltage, not stepping (better time resolution)
CPC
CPC
DMA1
box
DMA2
box
DMA2 box
DMA1
driers
Front view
Side view

3. TDMA systems on ASCOS 2008 H-TDMA (Hygroscopicity, Lund Univ.)
UFO-TDMA (Ultrafine Organic, Kuopio Univ.)
V-TDMA (Volatility, IFT Leipzig)
VH-TDMA (Volatility – Hygroscopicity, Queensland Univ.)

4. VH-TDMA
Look in situ at particle hygroscopicity before during and after volatilisation.
humidify
Select
Size
Examine
size
DT:H
GT:H=
DT:H/DT D0
Heat
Examine
size
Hydrophilic
Hydrophobic DT
Hydrophilic
Hydrophilic

6. LABORATORY: OPC – Volatility
Determines size segregated aerosol composition and mixing mode.
1 Hz, 32 chan, PMS PCASP preceded by 500 W heater
Size range: 0.05 < R < 5 µm
Temperature range: 70 < T < 800 ºC
Temperature scan duration: 15 minutes
Flow rate: 0.12 l/min
Power: 240 VAC
LABORATORY: SMPS – Volatility
Determines size segregated aerosol composition and mixing mode.
64 chan SMPS, built in house using TSI Long column, preceded by 500 W heater.
Size range: ~10 < R < ~240 nm
Temperature range: Laboratory < T < 800ºC (user defined 50ºC increments)
Sample flow: 1 l/min, Sheath flow: 6 – 10 l/min
SMPS scan duration: 2.5 minutes
Delay for temperature stabilisation: 2 minutes
Contains AM 241 radiation source
LABORATORY: CPC – TSI 3025
1 Hz Concentration: R > 3 nm
Flow rate: 1.5 l/min, Power: 240 VAC
HELICOPTER: CLASP
10 Hz, 16 chan, Optical Particle Counter
Size range: 0.12 < R < 9 µm
Flow rate: 3 l/min
Power: 24 VDC
Coms Protocol: RS485
Size: 24 x 8 x 6 cm, 0.5 kg
LABORATORY: OPC – PMS PCASP
1 Hz, 32 chan, number concentration: 0.05 < R < 5 µm
Flow rate: 0.12 l/min, Power: 240 VAC

7. Ammonium sulphate
Ammonium bisulphate
VOC ?

8. Inlet for
aerosols and gases
Helicopter
Vertical profiling
Gases (PTR-MS, Univ. Innsbruck)
Particles (Univ. Lund, Stockholm)

9. Aerosol inlet
Gas inlet

10. CPC
UCPC
OPC
Pump
Aerosol inlet
Aerosol rack

11. AOE-2001 Helicopter Aerosol System Aerosol Instrumentation Rack
TSI UCPC 3025: Dp > nm
TSI CPC 3760A: Dp > 15 nm
CLIMET OPC CI500: Dp > 300 nm PC
CPC
UCPC
OPC
Pump
Aerosol inlet
Isokinetic at 70 km/h

12. Time Resolution 1 Hz  Good Altitude Resolution
Ultrafine Particle Concentrations (Dp < 15 nm)
Flight #23, 8 August 2001, 88.3N
Arctic Boundary Layer Height at 350 m