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INSTRUMENTATION

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.

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INSTRUMENTATION

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  1. 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

  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. Hydrophobic Hydrophilic Hydrophilic Hydrophilic 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 DT

  5. 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

  6. Ammonium sulphate Ammonium bisulphate VOC ?

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

  8. Aerosol inlet Gas inlet

  9. CPC UCPC OPC Pump Aerosol inlet Aerosol rack

  10. AOE-2001 Helicopter Aerosol System Aerosol Instrumentation Rack PC TSI UCPC 3025: Dp > 3 nm TSI CPC 3760A: Dp > 15 nm CLIMET OPC CI500: Dp > 300 nm CPC UCPC OPC Pump Aerosol inlet Isokinetic at 70 km/h

  11. 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

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