ASCOS Planned Aerosol Instrumentation Aboard Oden Douglas Orsini Jost Heintzenberg Leibniz Institute for Tropospheric Research Leipzig, Germany.

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Presentation transcript:

ASCOS Planned Aerosol Instrumentation Aboard Oden Douglas Orsini Jost Heintzenberg Leibniz Institute for Tropospheric Research Leipzig, Germany

Motivation To contribute to measured physical and chemical properties of the marine aerosol ( especially Dp < 1 um) and to target biological particles Three instruments: 1.DMPS 1.VTDMA 1.Water Cyclone

DMPS Differential Mobility Particle Sizer Goal: To measure the aerosol size distribution Particle size range: 3 nm < Dp < 800 nm Sample Flow Rate:1 lpm Measurement Rate:Semi-continuous every 10 min.

VTDMA Volatility Tandem Differential Mobility Particle Analyzer Goal: To infer composition and mixing state based on reference volatility measurements 1. Select particle size (30 nm < Dp < 300 nm; 1 lpm) 2. Heat the selected aerosol size ( 3 temperatures possible ) 3. Re-measure the aerosol size

VTDMA Volatility Tandem Differential Mobility Particle Sizer Some reference temperatures: ~ o C ( H 2 SO 4, (NH 4 )HSO 4, (NH 4 ) 2 SO 4 ) ~ 300 o C ( volatile OC ) ~ o C ( less volatile OC + NaCl ) ~ ? ( viruses, bacteria, cell material ) - fine marine aerosols exist capable of surviving at 300 o C (Clarke, 1999, Clarke et al., 2003) - little data on volatility of viruses and bacteria as ambient particles To Be Determined: selected sizes + heating temperatures Time permitting: prelimin. tests of bubbled microlayer water to determine temperatures.

Water Cyclone Collects bulk aerosol into liquid (insoluble + soluble) Sample flow rate:17 lpm continuous Liquid sample flow: 24 hours: ml of sample liquid for analysis Consumables: 0.02  ultrapure water : 5 liters / day

Liquid Sample Analysis Water Cyclone On-Board Biological Enumeration Storage for Post Analysis Chemical and Biological

Water Cyclone On-Board Biological Enumeration Ship-board analysis of aerosol sample: (pending fluorescence microscope) 1. Concentrate sample liquid on.02  filter substrate (start with 24 hr. sample) 2. Stain with Sybr-Green/Gold which binds to nucleic acid 3. Enumerate biological particles (based on known protocol) with microscope

Post Analysis Water Cyclone microlayer liquid & bubbled microlayer aerosol collection into liquid Coordinate similar sample preparation and storage protocols e.g.: TOC Basic ions Amino acids EPS gels flow cytometry..

What is possible for consistent analysis ? microlayer liquid & bubbled microlayer aerosol collection into liquid fogwater aerosol impactors Coordinate parallel sample storage and protocols

An upper Dp size cut-off ? e.g. : Water Cyclone PM10 aerosol impactor Dp < 100 nm collection into liquid

Counting Protocol for Marine Samples