气候变化领域集成服务门户(CCPortal): Realistic Simulation of Tropical Atmospheric Gravity Waves Using Radar-Observed Precipitation Rate and Echo Top Height

CCPortal

DOI	10.1029/2019MS001949
	Realistic Simulation of Tropical Atmospheric Gravity Waves Using Radar-Observed Precipitation Rate and Echo Top Height
	Bramberger M.; Alexander M.J.; Grimsdell A.W.
发表日期	2020
ISSN	19422466
卷号	12 期号:8
英文摘要	Gravity waves (GWs) generated by tropical convection are important for the simulation of large-scale atmospheric circulations, for example, the quasi-biennial oscillation (QBO), and small-scale phenomena like clear-air turbulence. However, the simulation of these waves still poses a challenge due to the inaccurate representation of convection, and the high computational costs of global, cloud-resolving models. Methods combining models with observations are needed to gain the necessary knowledge on GW generation, propagation, and dissipation so that we may encode this knowledge into fast parameterized physics for global weather and climate simulation or turbulence forecasting. We present a new method suitable for rapid simulation of realistic convective GWs. Here, we associate the profile of latent heating with two parameters: precipitation rate and cloud top height. Full-physics cloud-resolving WRF simulations are used to develop a lookup table for converting instantaneous radar precipitation rates and echo top measurements into a high-resolution, time-dependent latent heating field. The heating field from these simulations is then used to force an idealized dry version of the WRF model. We validate the method by comparing simulated precipitation rates and cloud tops with scanning radar observations and by comparing the GW field in the idealized simulations to satellite measurements. Our results suggest that including variable cloud top height in the derivation of the latent heating profiles leads to better representation of the GWs compared to using only the precipitation rate. The improvement is especially noticeable with respect to wave amplitudes. This improved representation also affects the forcing of GWs on large-scale circulation. © 2020. The Authors.
语种	英语
scopus关键词	Atmospheric thermodynamics; Atmospheric turbulence; Climate models; Energy dissipation; Gravity waves; Heating; Radar; Radar measurement; Table lookup; Tropics; Atmospheric circulation; Atmospheric gravity waves; Clear-air turbulences; Cloud resolving model; Large-scale circulation; Quasi-biennial oscillation; Satellite measurements; Small-scale phenomena; Precipitation (meteorology); atmospheric convection; gravity wave; heating; observational method; precipitation (climatology); quasi-biennial oscillation; radar; satellite data
来源期刊	Journal of Advances in Modeling Earth Systems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156658
作者单位	NorthWest Research Associates, Boulder, CO, United States
推荐引用方式 GB/T 7714	Bramberger M.,Alexander M.J.,Grimsdell A.W.. Realistic Simulation of Tropical Atmospheric Gravity Waves Using Radar-Observed Precipitation Rate and Echo Top Height[J],2020,12(8).
APA	Bramberger M.,Alexander M.J.,&Grimsdell A.W..(2020).Realistic Simulation of Tropical Atmospheric Gravity Waves Using Radar-Observed Precipitation Rate and Echo Top Height.Journal of Advances in Modeling Earth Systems,12(8).
MLA	Bramberger M.,et al."Realistic Simulation of Tropical Atmospheric Gravity Waves Using Radar-Observed Precipitation Rate and Echo Top Height".Journal of Advances in Modeling Earth Systems 12.8(2020).