Vertical Variations of Cloud Microphysical Relationships in Marine Stratocumulus Clouds Observed During the ACE‐ENA Campaign
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- Department of Physics Michigan Technological University MI USA, Department of Atmospheric Sciences Yonsei University Seoul Korea
- Department of Atmospheric Sciences Yonsei University Seoul Korea
- Department of Physics Michigan Technological University MI USA
- Department of Energy Environmental and Chemical Engineering Center for Aerosol Science and Engineering University of Washington St. Louis WA USA
- Key Laboratory for Aerosol‐Cloud‐Precipitation of China Meteorological Administration/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC‐FEMD) Nanjing University of Information Science &, Technology Nanjing China
- Environmental and Climate Sciences Department Brookhaven National Laboratory Upton NY USA
- Pacific Northwest National Laboratory Richland WA USA
Abstract This study examines the vertical variations of cloud microphysical relationships and their implications to cloud microphysical processes in marine stratocumulus clouds using in‐situ aircraft observations during the Aerosol and Cloud Experiments in Eastern North Atlantic (ACE‐ENA) field campaign. A new diagram with a coordinate system based on cloud droplet liquid water content (L c ) and phase relaxation time scale is proposed to investigate mixing mechanisms. This new diagram analysis shows that the inhomogeneous mixing trait is dominant near the cloud top, but homogeneous mixing trait is stronger at lower altitudes. The relevant scale parameters (i.e., transition length scale and transition scale number) also indicate a high likelihood of inhomogeneous mixing. The relationship between L c and standard deviation of droplet radius (σ R ) clearly shows the vertical transition: the correlation between L c and σ R is positive at lower cloud altitudes, but it becomes negative as altitude increases. Such a vertical transition is consistent with the vertical circulation mixing, modulating the cloud microphysical relationships to suggest homogeneous mixing at a significant depth from the cloud top.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Atmospheric Radiation Measurement (ARM) Data Center; Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- Korea government (MSIT); National Natural Science Foundation of China (NSFC); National Research Foundation of Korea (NRF); USDOE; USDOE Office of Science (SC), Biological and Environmental Research (BER)
- Contributing Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Grant/Contract Number:
- AC05-76RL01830; SC0012704; SC0020052; SC0020053
- OSTI ID:
- 1835384
- Report Number(s):
- BNL-222437-2021-JAAM; PNNL-SA-159750; e2021JD034700
- Journal Information:
- Journal of Geophysical Research: Atmospheres, Journal Name: Journal of Geophysical Research: Atmospheres Journal Issue: 24 Vol. 126; ISSN 2169-897X
- Publisher:
- American Geophysical Union (AGU)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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