气候变化领域集成服务门户(CCPortal): The Role of Vertically and Obliquely Propagating Gravity Waves in Influencing the Polar Summer Mesosphere

CCPortal

DOI	10.1029/2020JD032495
	The Role of Vertically and Obliquely Propagating Gravity Waves in Influencing the Polar Summer Mesosphere
	Thurairajah B.; Cullens C.Y.; Siskind D.E.; Hervig M.E.; Bailey S.M.
发表日期	2020
ISSN	2169897X
卷号	125 期号:9
英文摘要	Using an 8-year (2007–2014) data set from two different limb-viewing instruments, we evaluate the relative roles of vertically versus obliquely propagating gravity waves (GWs) as sources of GWs in the polar summer mesosphere. Obliquely propagating waves are of interest because they are presumed to be generated by the summer monsoons. In the high-latitude upper mesosphere, the correlation coefficient between the time series of ice water content (IWC) and GW amplitude is 0.48, indicating that the observed GWs enhance polar mesospheric clouds (PMCs). For vertically propagating waves, the correlation coefficient between IWC and stratospheric/lower mesospheric (20–70 km) GW amplitude at the same high latitudes becomes more negative with increasing altitude. This change in correlation from negative in the lower mesosphere to positive at PMC altitudes suggests the presence of another source of GWs. The positive correlation coefficient between the time series of IWC and GW amplitude from 0–50°N, 20–90 km shows a slanted structure suggesting oblique propagation. This slanted structure is more robust in some seasons compared to others, and this interannual variability may be due to the latitudinal gradient of the mesospheric easterly jet where steeper gradients allow for low-latitude tropospheric GWs to be refracted to the high-latitude mesosphere more efficiently. Gravity-Wave Regional or Global Ray Tracer (GROGRAT) ray tracing simulations show that more GWs propagate obliquely compared to vertically propagating waves that reach PMC altitudes. For obliquely propagating waves, GROGRAT simulations indicate that nonorographic tropospheric GWs with faster phase speed (>20 m/s) and longer horizontal wavelength (>400 km) have a higher probability of reaching the polar summer mesosphere. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	gravity waves; oblique propagation; polar mesospheric clouds
语种	英语
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/186027
作者单位	Center for Space Science and Engineering Research, Bradley Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, VA, United States; Space Science Laboratory, University of California, Berkeley, CA, United States; Space Science Division, Naval Research Laboratory, Washington, DC, United States; GATS, Inc., Driggs, ID, United States
推荐引用方式 GB/T 7714	Thurairajah B.,Cullens C.Y.,Siskind D.E.,et al. The Role of Vertically and Obliquely Propagating Gravity Waves in Influencing the Polar Summer Mesosphere[J],2020,125(9).
APA	Thurairajah B.,Cullens C.Y.,Siskind D.E.,Hervig M.E.,&Bailey S.M..(2020).The Role of Vertically and Obliquely Propagating Gravity Waves in Influencing the Polar Summer Mesosphere.Journal of Geophysical Research: Atmospheres,125(9).
MLA	Thurairajah B.,et al."The Role of Vertically and Obliquely Propagating Gravity Waves in Influencing the Polar Summer Mesosphere".Journal of Geophysical Research: Atmospheres 125.9(2020).