INSTRUMENTATION
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INSTRUMENTATION • DMPS – DIFFERENTIAL MOBITY PARTICLE SIZER • H-TDMA HYGRSCOPIC TANDEM DMA • CCN COUNTER CLOUD CONDENSATION NUCLEI COUNTER H ygroscopic Tandem D ifferential M obility Analyser H -TDM A Hum id A erosol CPC M onodisperse Aerosol A m bient A erosol DMA1 DMA2 A erosol H um idifier B ipolar C harger CPC D rier Humidif ier dry particles wet particles Measures diameter hygroscopic growth at sub- saturations: dry wet f d d G
description
Humidifier. dry particles. wet particles. Measures diameter hygroscopic growth at sub-saturations:. INSTRUMENTATION. DMPS – DIFFERENTIAL MOBITY PARTICLE SIZER H-TDMA – HYGRSCOPIC TANDEM DMA CCN COUNTER – CLOUD CONDENSATION NUCLEI COUNTER. New Lund H-TDMA now under construction. - PowerPoint PPT Presentation
Transcript of INSTRUMENTATION
INSTRUMENTATION
• DMPS –
DIFFERENTIAL MOBITY PARTICLE SIZER
• H-TDMA –
HYGRSCOPIC TANDEM DMA
• CCN COUNTER –
CLOUD CONDENSATION NUCLEI COUNTER
Hygroscopic Tandem Differential MobilityAnalyserH-TDMA
HumidAerosol
CPCMonodisperseAerosol
Ambient Aerosol
DMA1 DMA2Aerosol
Humidifier
Bip
ola
r
Charger
CPC
Drie
r
Hygroscopic Tandem Differential Mobility AnalyserH-TDMA
HumidAerosol
CPCMonodisperseAerosol
Ambient Aerosol
DMA1 DMA2Aerosol
Humidifier
Bip
ola
rC
harg
er
CPC
Drier
Humidifier
dry particles wet particles
Measures diameter hygroscopic growth at sub-saturations:
dry
wetf d
dG
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)
Front view Side view
DMA2 box
DMA1box
DMA1driers
CPCCPC
DMA2box
• H-TDMA (Hygroscopicity, Lund Univ.)• UFO-TDMA (Ultrafine Organic, Kuopio Univ.)• V-TDMA (Volatility, IFT Leipzig)• VH-TDMA (Volatility – Hygroscopicity, Queensland Univ.)
TDMA systems on ASCOS 2008
VH-TDMA
• Look in situ at particle hygroscopicity before during and after volatilisation.
Examine size
HeatSelect Size
humidify
Examine size
D0
DT
DT:H GT:H=
DT:H/DT
Hydrophilic
Hydrophobic
HydrophilicHydrophilic
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
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
Ammonium sulphate Ammonium bisulphateVOC
?
HelicopterVertical profiling
•Gases (PTR-MS, Univ. Innsbruck)
•Particles (Univ. Lund, Stockholm)
Inlet for aerosols and gases
Gas inlet
Aerosol inlet
Aerosol rack
Aerosol inlet
CPC
UCPC
OPC
Pump
AOE-2001 Helicopter Aerosol SystemAerosol Instrumentation Rack
OPC
UCPC
CPC
Pump
PCTSI UCPC 3025: Dp > 3 nmTSI CPC 3760A: Dp > 15 nmCLIMET OPC CI500: Dp > 300 nm
Isokinetic at 70 km/hAerosol inlet
0.0001
0.001
0.01
0.1
1
10
100
1000
1 10 100 1000 10000
Dp (nm)
dN/d
logD
p (c
m-3
)
Time Resolution 1 Hz Good Altitude Resolution
Flight #23 2001-08-08, 18:09-19:11
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20
40
60
80
100
120
140
160
180
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-100 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600
Particle Concentration (cm-3)
Alt
itu
de
(m)
UF AscentUF Descent
Ultrafine Particle Concentrations (Dp < 15 nm)Flight #23, 8 August 2001, 88.3NArctic Boundary Layer Height at 350 m
