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Ice nucleation characteristics of Asian and Saharan desert dust

Field P.R., Moehler O., Connolly P., Kraemer M., Cotton R., Heymsfield A.J., Schnaiter M. Ice nucleation characteristics of Asian and Saharan desert dust. Saharan dust sample — desert close to Cairo, Egypt (SD2). Asian dust sample — Takla Makan desert, China (AD1).

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Ice nucleation characteristics of Asian and Saharan desert dust

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  1. Field P.R., Moehler O., Connolly P., Kraemer M., Cotton R., Heymsfield A.J., Schnaiter M. Ice nucleation characteristics of Asian and Saharan desert dust

  2. Saharan dust sample — desert close to Cairo, Egypt (SD2) Asian dust sample — Takla Makan desert, China (AD1) Temperature range: -20 to -50C

  3. -50 T, P -58 1.6 Si, Sw 1.0 0.4 100 SID Af 10 1 10 SID conc 0.1 100 SID size 10 1

  4. -34 T, P -46 1.6 Si, Sw 1.0 0.4 100 SID Af 10 1 10 SID conc 0.1 100 SID size 10 1

  5. -22 T, P -34 1.4 Si, Sw 1.0 0.4 100 SID Af 10 1 10 SID conc 0.1 100 SID size 10 1

  6. 1.6 Critical ice saturation ratio 1.4 1.2 1.0 Critical Temperature [oC] -60 -20 -40

  7. 1.0 Ice nucleation efficiency 0.1 0.01 Critical Temperature [oC] -60 -20 -40

  8. Conclusions • No deposition nucleation for T>-35C • T>-30C: Efficiency ~1% • T<-30C: Deposition efficiency 1-10%, Immersion efficiency >10% • Repeated nucleation decreases critical ice saturation req'd for deposition nucleation

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