AGS-PRF: Modeling Ice Crystal Habit Evolution from Vapor Growth and Riming--Investigating How Evolving Ice Particle Properties Impacts Clouds, Precipitation, and Phase Partitioning

GSTDTAP

项目编号	1524267
	AGS-PRF: Modeling Ice Crystal Habit Evolution from Vapor Growth and Riming--Investigating How Evolving Ice Particle Properties Impacts Clouds, Precipitation, and Phase Partitioning
	Anders Jensen
主持机构	Jensen Anders
项目开始年	2016
	2016-04-01
项目结束日期	2018-03-31
资助机构	US-NSF
项目类别	Fellowship
项目经费	86000(USD)
国家	美国
语种	英语
英文摘要	Representing ice in microphysics models is important not only to study the effects of ice on cloud dynamics and cloud lifetime, but also for accurate quantitative precipitation forecasts. Traditional microphysics parameterizations artificially separate ice into categories such as cloud ice, snow, and graupel. These models assume that for each category ice crystal size varies with mass, but they do not account for ice crystal shape evolution. In nature, ice crystal shape, or habit, is temperature dependent and evolves as ice moves through a cloud. Ice crystal shape significantly affects vapor growth rates by varying the gradients in the encompassing vapor field. Ice crystal shape also influences riming rates and fall speed. Traditional models are not able to capture this ice crystal shape sensitivity. This project will study the impact of ice crystal shape evolution on different cloud systems. Simulations will be conducted using the Weather Research and Forecasting (WRF) model to look at how ice crystal habit evolution impacts orographic precipitation, tropical cyclone dynamics and precipitation, and squall lines. A 2-dimensional modeling framework will also be used to explore the effects of evolving ice crystal shape on phase partitioning in mixed-phase clouds. Finally, how representing lightly-rimed ice crystals, which is now possible by evolving ice crystal shape, impacts mixed-phase cloud stability will be studied. Intellectual Merit: The research provides a unique opportunity to study how ice crystal habit evolution impacts different cloud systems. At present, the degree to which ice particle shape evolution influences cloud evolution is unknown. With the new microphysics parameterization, the influence evolving ice crystal shape has on cloud system properties can be explored. How light riming affects mixed-phase clouds can also be examined for the first time. Broader Impacts: Modeling ice crystal fall speed evolution which is partially determined by ice crystal shape is crucial for quantitative precipitation forecasts. Also, cirrus cloud properties and lifetime are incredibly sensitive to ice crystal fall speeds. Cirrus cloud radiative properties depend on ice crystal shape as well, meaning ice crystal shape could have important influences on climate. Because the microphysical methods in this study can, in principle, be used in any modeling framework, the research has the potential to impact modeling ranging from operational forecasting through climate studies of ice clouds. Being able to more accurately forecast precipitation, especially heavy or persistent precipitation that could cause flooding in general makes this research relevant to society.
来源学科分类	Geosciences - Atmospheric and Geospace Sciences
文献类型	项目
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/69298
专题	环境与发展全球科技态势
推荐引用方式 GB/T 7714	Anders Jensen.AGS-PRF: Modeling Ice Crystal Habit Evolution from Vapor Growth and Riming--Investigating How Evolving Ice Particle Properties Impacts Clouds, Precipitation, and Phase Partitioning.2016.