What Controls Crystal Diversity and Microphysical Variability in Cirrus Clouds?

Author:

Chandrakar Kamal Kant1ORCID,Morrison Hugh1ORCID,Harrington Jerry Y.2,Pokrifka Gwenore2,Magee Nathan3

Affiliation:

1. NSF National Center for Atmospheric Research Boulder CO USA

2. The Pennsylvania State University University Park PA USA

3. The College of New Jersey Ewing NJ USA

Abstract

AbstractVariability of ice microphysical properties like crystal size and density in cirrus clouds is important for climate through its impact on radiative forcing, but challenging to represent in models. For the first time, recent laboratory experiments of particle growth (tied to crystal morphology via deposition density) are combined with a state‐of‐the‐art Lagrangian particle‐based microphysics model in large‐eddy simulations to examine sources of microphysical variability in cirrus. Simulated particle size distributions compare well against balloon‐borne observations. Overall, microphysical variability is dominated by variability in the particles' thermodynamic histories. However, diversity in crystal morphology notably increases spatial variability of mean particle size and density, especially at mid‐levels in the cloud. Little correlation between instantaneous crystal properties and supersaturation occurs even though the modeled particle morphology is directly tied to supersaturation based on laboratory measurements. Thus, the individual thermodynamic paths of each particle, not the instantaneous conditions, control the evolution of particle properties.

Funder

National Science Foundation

Biological and Environmental Research

Publisher

American Geophysical Union (AGU)

Reference44 articles.

1. Cloud Microphysics and Climate

2. Improvements in Shortwave Bulk Scattering and Absorption Models for the Remote Sensing of Ice Clouds

3. Bryan G.(2019).CM1 numerical model release 19.8 (cm1r19.8)[Software].University Corporation for Atmospheric Research. Retrieved fromhttps://www2.mmm.ucar.edu/people/bryan/cm1/

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