CEDAR: Global and Seasonal Occurrence and Characteristics of Mesospheric Bores

GSTDTAP

项目编号	1908237
	CEDAR: Global and Seasonal Occurrence and Characteristics of Mesospheric Bores
	Steven Smith (Principal Investigator)
主持机构	Trustees of Boston University
项目开始年	2019
	2019-07-01
项目结束日期	2022-06-30
资助机构	US-NSF
项目类别	Standard Grant
项目经费	268200(USD)
国家	美国
语种	英语
英文摘要	This award is an experimental effort to characterize rare but strong disturbances in the Earth's atmosphere that are often visible to the naked eye as large bands of faint optical emission called airglow that extend from horizon to horizon. These disturbances are atmospheric waves that are known as mesospheric bores. These waves are characterized by an extensive propagating "step-like" frontal region of enhanced or depleted airglow followed a train of waves. Mesospheric bores exhibit large brightness amplitudes (typically >10%) and can transport large amounts of energy and momentum through the mesosphere-lower-thermosphere (MLT) region. The wave dynamics significantly affects the large-scale temperature and circulation structure of the MLT and higher atmospheric regions. Understanding the full scope of wave effects on the MLT region is important for obtaining a complete physical picture of atmospheric processes. This work will utilize the data from eight existing ground-based optical imaging systems, together with a suite of co-located multi-diagnostic instrumentation and satellite data, to investigate the global and seasonal occurrence characteristics of mesospheric bores and other frontal gravity waves in the MLT region. The effort will: 1) conduct a global survey and characterization of these waves and an estimate of the momentum flux contributing to the MLT using the Boston University all-sky imager network, and 2) utilize co-located ground-based multi-diagnostic measurements and satellite measurements to supplement the imager data in order to fully characterize both the propagation environment and the gravity wave propagation modes. This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
文献类型	项目
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/213592
专题	环境与发展全球科技态势
推荐引用方式 GB/T 7714	Steven Smith .CEDAR: Global and Seasonal Occurrence and Characteristics of Mesospheric Bores.2019.