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UPR/CSU Cloud Chemistry

UPR/CSU Cloud Chemistry. Jeffrey L. Collett Atmospheric Science Department Colorado State University. Cloud and fog chemistry. Cloud composition depends on environment Influence of CCN, soluble gases, and aqueous reaction on cloud composition ?

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UPR/CSU Cloud Chemistry

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  1. UPR/CSU Cloud Chemistry Jeffrey L. Collett Atmospheric Science Department Colorado State University

  2. Cloud and fog chemistry • Cloud composition depends on environment • Influence of CCN, soluble gases, and aqueous reaction on cloud composition ? • Relation between cloud and precipitation chemistry?

  3. UPR/CSU cloud/fog sampling • Planned measurements • Liquid Water Content (LWC) • Bulk (average) cloudwater composition • Drop size-resolved cloud composition • Inorganic and organic species

  4. Bulk cloudwater sampling • Caltech Active Strand Cloudwater Collector (CASCC) • Teflon collection surfaces (stainless steel also available) • Time resolution as fast as 10-15 minutes possible • Collects complete drop size spectrum (D > 3.5 um) • Composition measurements • pH • Inorganic ions • S(IV) • H2O2 • Fe and Mn • Total Organic Carbon • Total Nitrogen • Organic speciation

  5. Drop size-resolved cloudwater sampling • Size-fractionating CASCC • Teflon collection surfaces (stainless steel also available) • Time resolution as fast as 30 minutes • Collects two drop size fractions, separated at ~15 um • 3-stage version also available • Composition measurements similar to CASCC

  6. Selected questions • How does cloud chemistry vary with source influence? • Dust • Marine • Anthropogenic • Terrestrial biogenic • Volcanic • What are key pathways for in-cloud sulfate production? • How abundant are organics under different source influences • OC speciation? SOA? • Does cloud drop composition vary with drop size? • Influence of CCN

  7. Possible additional measurements • CSU 5-stage cloudwater collector • CCN composition using compact CCN coupled with microchip capillary electrophoresis • 0.5-1 hr time resolution • Collaborative effort between Scripps (Roberts) and CSU (Collett and Henry) • Hi-Vol

  8. Aqueous reactions • SO2 dissolves in drops where it is oxidized • by O3, H2O2 and O2 • to nonvolatile sulfate • Path importance is function of • pH • oxidant availability • catalyst availability

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