期刊
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
卷 124, 期 17-18, 页码 10049-10090出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2018JD030122
关键词
cirrus; cloud microphysics; ice particle habit; in situ cirrus; anvil cirrus; radiative transfer
资金
- NSF
- NASA [NNA15BA18P, NNX14AQ55G]
- DOE [DE-SC0007035]
- National Science Foundation
- U.S. Department of Energy (DOE) [DE-SC0007035] Funding Source: U.S. Department of Energy (DOE)
- NASA [674034, NNX14AQ55G] Funding Source: Federal RePORTER
Results from 22 airborne field campaigns, including more than 10 million high-resolution particle images collected in cirrus formed in situ and in convective anvils, are interpreted in terms of particle shapes and their potential impact on radiative transfer. Emphasis is placed on characterizing ice particle shapes in tropical maritime and midlatitude continental anvil cirrus, as well as in cirrus formed in situ in the upper troposphere, and subvisible cirrus in the upper tropical troposphere layer. There is a distinctive difference in cirrus ice particle shapes formed in situ compared to those in anvils that are generated in close proximity to convection. More than half the mass in cirrus formed in situ are rosette shapes (polycrystals and bullet rosettes). Cirrus formed from fresh convective anvils is mostly devoid of rosette-shaped particles. However, small frozen drops may experience regrowth downwind of an aged anvil in a regime with RHice > similar to 120% and then grow into rosette shapes. Identifiable particle shapes in tropical maritime anvils that have not been impacted by continental influences typically contain mostly single plate-like and columnar crystals and aggregates. Midlatitude continental anvils contain single-rimed particles, more and larger aggregates with riming, and chains of small ice particles when in a highly electrified environment. The particles in subvisible cirrus are < similar to 100 mu m and quasi-spherical with some plates and rare trigonal shapes. Percentages of particle shapes and power laws relating mean particle area and mass to dimension are provided to improve parameterization of remote retrievals and numerical simulations.
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