Partition between supercooled liquid droplets and ice crystals in mixed-phase clouds based on airborne in situ observations DOI Creative Commons
Flor Vanessa Maciel, Minghui Diao, Ching An Yang

et al.

Atmospheric measurement techniques, Journal Year: 2024, Volume and Issue: 17(16), P. 4843 - 4861

Published: Aug. 23, 2024

Abstract. The onset of ice nucleation in mixed-phase clouds determines the lifetime and microphysical properties clouds. In this work, we develop a novel method that differentiates between various phases clouds, such as dominated by pure liquid or segments, compared with those having crystals surrounded supercooled water droplets vice versa. Using method, examine relationship macrophysical Southern Ocean at −40 to 0 °C (e.g. stratiform cumuliform clouds) based on situ aircraft-based observations during US National Science Foundation Clouds, Radiation, Aerosol Transport Experimental Study (SOCRATES) flight campaign. results show exchange from perspective, represented increasing spatial ratio regions containing relative total in-cloud region (defined ratio), is positively correlated phase content (IWC), decreasing (LWC), mass fraction, particle number fraction (IPNF). becomes more significant 3 when cloud (ICRs) start appear. Occurrence frequencies thermodynamic change similar temperature (i.e. −17.5 °C) among three types definitions ratio, IPNF. indirect effects are quantified for different using concentrations aerosols greater than 100 500 nm (N>100 N>500, respectively). N>500 shows stronger positive correlations ratios N>100. This result indicates larger potentially contain ice-nucleating particles (INPs), which facilitate formation impact also 2 just appear mixed ICRs have formed, possibly due competing aerosol primary secondary production 3. dynamic conditions each phase. turbulence higher updraughts coexist (phases 1 4, highest seen crystals. These indicate both support maintenance amongst Overall, these illustrate varying aerosols, thermodynamics, dynamics through stages evolution new categorizes phases.

Language: Английский

A Comparative Study of Cloud Properties Between Northern and Southern High Latitudes Based on ARM Observations and EAMv2 Simulations DOI
Neel Desai, Minghui Diao, Yang Shi

et al.

Journal of Geophysical Research Atmospheres, Journal Year: 2025, Volume and Issue: 130(8)

Published: April 24, 2025

Abstract Earth's high‐latitude regions show a considerable amount of cloud coverage, which significantly affects global radiation budgets. In this study, we examine ground‐ and ship‐based remote sensing observations from two Atmospheric Radiation Measurement (ARM) field campaigns conducted in the Northern Southern Hemispheres (NH SH). A comparison macrophysical properties for low, mid‐level, high, deep clouds shows that top heights thickness values are higher Arctic each type compared with Ocean Antarctic regions, possibly due to sea surface temperatures north Atlantic. The also lower ice phase occurrence frequencies SH high latitudes low clouds. For mid‐level clouds, distributions as function temperature small geographical variabilities. then Department Energy (DOE) Exascale Earth System Model (E3SM) evaluate representations these properties. results model captures base well reproduces differences between hemispheres. But underestimates all types. Such bias is strongly correlated positive relative humidity biases negative aerosol number concentration biases, indicating an important role aerosols modulating partitioning model.

Language: Английский

Citations

0
Partition between supercooled liquid droplets and ice crystals in mixed-phase clouds based on airborne in situ observations DOI Creative Commons
Flor Vanessa Maciel, Minghui Diao, Ching An Yang

et al.

Atmospheric measurement techniques, Journal Year: 2024, Volume and Issue: 17(16), P. 4843 - 4861

Published: Aug. 23, 2024

Abstract. The onset of ice nucleation in mixed-phase clouds determines the lifetime and microphysical properties clouds. In this work, we develop a novel method that differentiates between various phases clouds, such as dominated by pure liquid or segments, compared with those having crystals surrounded supercooled water droplets vice versa. Using method, examine relationship macrophysical Southern Ocean at −40 to 0 °C (e.g. stratiform cumuliform clouds) based on situ aircraft-based observations during US National Science Foundation Clouds, Radiation, Aerosol Transport Experimental Study (SOCRATES) flight campaign. results show exchange from perspective, represented increasing spatial ratio regions containing relative total in-cloud region (defined ratio), is positively correlated phase content (IWC), decreasing (LWC), mass fraction, particle number fraction (IPNF). becomes more significant 3 when cloud (ICRs) start appear. Occurrence frequencies thermodynamic change similar temperature (i.e. −17.5 °C) among three types definitions ratio, IPNF. indirect effects are quantified for different using concentrations aerosols greater than 100 500 nm (N>100 N>500, respectively). N>500 shows stronger positive correlations ratios N>100. This result indicates larger potentially contain ice-nucleating particles (INPs), which facilitate formation impact also 2 just appear mixed ICRs have formed, possibly due competing aerosol primary secondary production 3. dynamic conditions each phase. turbulence higher updraughts coexist (phases 1 4, highest seen crystals. These indicate both support maintenance amongst Overall, these illustrate varying aerosols, thermodynamics, dynamics through stages evolution new categorizes phases.

Language: Английский

Citations

2