期刊
CHINESE SCIENCE BULLETIN
卷 59, 期 9, 页码 896-903出版社
SCIENCE PRESS
DOI: 10.1007/s11434-013-0097-1
关键词
Entrainment mixing; Cumulus; Homogeneous/inhomogeneous mixing; Observation; Model
资金
- National Natural Science Foundation of China [41030962, 41305120, 41375138, 41275151, 41075029, 41375137, 41305034]
- Natural Science Foundation of Jiangsu Province, China [BK20130988, BK2012860]
- Specialized Research Fund for the Doctoral Program of Higher Education [20133228120002]
- Natural Science Foundation of the Higher Education Institutions of Jiangsu Province, China [13KJB170014]
- China Meteorological Administration Special Public Welfare Research Fund [GYHY201406007]
- National Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics
- Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, China [KDW1102, KDW1104, KDW1201]
- Key Laboratory of Meteorological Disaster of Ministry of Education, China [KLME1305, KLME1205, KLME1107]
- Qing-Lan Project for Cloud-Fog-Precipitation-Aerosol Study in Jiangsu Province, China
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- U.S. Department of Energy's (DOE) Earth System Modeling (ESM) program via the FASTER project
- Atmospheric System Research (ASR) program
Parameterization of entrainment-mixing processes in cumulus clouds is critical to improve cloud parameterization in models, but is still at its infancy. For this purpose, we have lately developed a formulation to represent a microphysical measure defined as homogeneous mixing degree in terms of a dynamical measure defined as transition scale numbers, and demonstrated the formulation with measurements from stratocumulus clouds. Here, we extend the previous work by examining data from observed cumulus clouds and find positive correlations between the homogeneous mixing degree and transition scale numbers. These results are similar to those in the stratocumulus clouds, but proved valid for the first time in observed cumulus clouds. The empirical relationships can be used to parameterize entrainment-mixing processes in two-moment microphysical schemes. Further examined are the effects of secondary mixing events on the relationships between homogeneous mixing degree and transition scale numbers with the explicit mixing parcel model. The secondary mixing events are found to be at least partially responsible for the larger scatter in the above positive correlations based on observations than that in the previous results based on numerical simulations without considering secondary mixing events.
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