Transcript INSTRUMENTATION

INSTRUMENTATION
• DMPS –
Humidifier Differential Mobility Analyser
Hygroscopic Tandem
DIFFERENTIAL MOBITY PARTICLE
H-TDMA SIZER
Bipolar
Charger
Drier
Monodisperse Aerosol
DMA1
Aerosol
Humidifier
Humid
Aerosol
CPC
wet particles
Humid
DMA2
Monodisperse Aerosol
Aerosol
CPC
HYGRSCOPIC TANDEM DMA
•
Drier
CPC
Measures diameter hygroscopic growth
at sub-saturations:
CCN
COUNTER –
Bipolar
Charger
Ambient
Aerosol
Ambient
dry
particles CPC
Aerosol
• H-TDMA –
Hygroscopic Tandem Differential Mobility Analyser
H-TDMA
CLOUD
DMA1
Aerosol
Humidifier
CONDENSATION NUCLEI
DMA2
COUNTERd wet
Gf 
d dry
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
DMA1
box
DMA2 box
CPC
DMA2
box
DMA1
driers
Front view
Side view
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.)
VH-TDMA
• Look in situ at particle hygroscopicity
before during and after volatilisation.
humidify
Select
Size
D0
DT:H
GT:H=
Examine DT:H/DT
size
Heat
Hydrophobic
DT
Hydrophilic
Hydrophilic
Hydrophilic
Examine
size
LABORATORY: OPC – Volatility
LABORATORY: SMPS – 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
•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
LABORATORY: OPC – PMS PCASP
• 1 Hz, 32 chan, number concentration: 0.05 < R < 5 µm
• Flow rate: 0.12 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
VOC
Ammonium sulphate
?
Ammonium bisulphate
Helicopter
Vertical profiling
•Gases (PTR-MS, Univ. Innsbruck)
•Particles (Univ. Lund, Stockholm)
Inlet for
aerosols
and gases
Aerosol
inlet
Gas
inlet
CPC
UCPC
OPC
Pump
Aerosol
inlet
Aerosol
rack
AOE-2001 Helicopter Aerosol System
Aerosol Instrumentation Rack
TSI UCPC 3025:
Dp > 3 nm
TSI CPC 3760A:
Dp > 15 nm
CLIMET OPC CI500: Dp > 300 nm
PC
1000
CPC
100
dN/dlogDp (cm-3)
10
UCPC
1
0.1
OPC
0.01
0.001
Pump
0.0001
1
10
100
1000
10000
Dp (nm)
Aerosol inlet
Isokinetic at 70 km/h
Time Resolution 1 Hz 
Good Altitude Resolution
Flight #23 2001-08-08, 18:09-19:11
200
180
160
Ultrafine Particle Concentrations (Dp < 15 nm)
140
Flight #23, 8 August 2001, 88.3N
Arctic Boundary Layer Height at 350 m
Altitude (m)
120
100
UF Ascent
UF Descent
80
60
40
20
0
-100
0
100
200
300
400
500
600
700
800
900
1000
Particle Concentration (cm-3)
1100
1200
1300
1400
1500
1600