气候变化领域集成服务门户(CCPortal): Modeling Responses of Polar Mesospheric Clouds to Gravity Wave and Instability Dynamics and Induced Large-Scale Motions

CCPortal

DOI	10.1029/2021JD034643
	Modeling Responses of Polar Mesospheric Clouds to Gravity Wave and Instability Dynamics and Induced Large-Scale Motions
	Dong W.; Fritts D.C.; Thomas G.E.; Lund T.S.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:13
英文摘要	A gravity wave (GW) model that includes influences of temperature variations and large-scale advection on polar mesospheric cloud (PMC) brightness having variable dependence on particle radius is developed. This Complex Geometry Compressible Atmosphere Model for PMCs (CGCAM-PMC) is described and applied here for three-dimensional (3-D) GW packets undergoing self-acceleration (SA) dynamics, breaking, momentum deposition, and secondary GW (SGW) generation below and at PMC altitudes. Results reveal that GW packets exhibiting strong SA and instability dynamics can induce significant PMC advection and large-scale transport, and cause partial or total PMC sublimation. Responses modeled include PMC signatures of GW propagation and SA dynamics, “voids” having diameters of ∼500–1,200 km, and “fronts” with horizontal extents of ∼400–800 km. A number of these features closely resemble PMC imaging by the Cloud Imaging and Particle Size (CIPS) instrument aboard the Aeronomy of Ice in the Mesosphere (AIM) satellite. Specifically, initial CGCAM-PMC results closely approximate various CIPS images of large voids surrounded by smaller void(s) for which dynamical explanations have not been offered to date. In these cases, the GW and instabilities dynamics of the initial GW packet are responsible for formation of the large void. The smaller void(s) at the trailing edge of a large void is (are) linked to the lower- or higher-altitude SGW generation and primary mean-flow forcing. We expect an important benefit of such modeling to be the ability to infer local forcing of the mesosphere and lower thermosphere (MLT) over significant depths when CGCAM-PMC modeling is able to reasonably replicate PMC responses. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	Gravity wave instabilities; Induced large-scale motions; Polar mesospheric clouds
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/237150
作者单位	Global Atmospheric Technologies and Sciences (GATS), Boulder, CO, United States; Center for Space and Atmospheric Research (CSAR), Embry-Riddle Aeronautical University, Daytona Beach, FL, United States; Laboratory for Atmospheric and Space Physics (LASP), University of Colorado, Boulder, CO, United States
推荐引用方式 GB/T 7714	Dong W.,Fritts D.C.,Thomas G.E.,et al. Modeling Responses of Polar Mesospheric Clouds to Gravity Wave and Instability Dynamics and Induced Large-Scale Motions[J],2021,126(13).
APA	Dong W.,Fritts D.C.,Thomas G.E.,&Lund T.S..(2021).Modeling Responses of Polar Mesospheric Clouds to Gravity Wave and Instability Dynamics and Induced Large-Scale Motions.Journal of Geophysical Research: Atmospheres,126(13).
MLA	Dong W.,et al."Modeling Responses of Polar Mesospheric Clouds to Gravity Wave and Instability Dynamics and Induced Large-Scale Motions".Journal of Geophysical Research: Atmospheres 126.13(2021).