DOI: 10.1002/2015GL063237
论文题名: Dust devil signatures in infrasound records of the International Monitoring System
作者: Lorenz R.D. ; Christie D.
刊名: Geophysical Research Letters
ISSN: 0094-8869
EISSN: 1944-8600
出版年: 2015
卷: 42, 期: 6 起始页码: 2009
结束页码: 2014
语种: 英语
英文关键词: dust devil
; infrasound
; microbarometer
; vortex
Scopus关键词: Boundary layers
; Dust
; Monitoring
; Comprehensive nuclear-test-ban treaty verification
; Continuous measurements
; Dust devils
; Infrasound
; Infrasound monitoring
; International monitoring systems
; Microbarometer
; Time domain filtering
; Vortex flow
; dust devil
; infrasonics
; periodicity
; vorticity
; Australia
; Warramunga
英文摘要: We explore whether dust devils have a recognizable signature in infrasound array records, since several Comprehensive Nuclear-Test-Ban Treaty verification stations conducting continuous measurements with microbarometers are in desert areas which see dust devils. The passage of dust devils (and other boundary layer vortices, whether dust laden or not) causes a local temporary drop in pressure: the high-pass time domain filtering in microbarometers results in a "heartbeat" signature, which we observe at the Warramunga station in Australia. We also observe a ∼50min pseudoperiodicity in the occurrence of these signatures and some higher-frequency infrasound. Dust devils do not significantly degrade the treaty verification capability. The pipe arrays for spatial averaging used in infrasound monitoring degrade the detection efficiency of small devils, but the long observation time may allow a useful census of large vortices, and thus, the high-sensitivity infrasonic array data from the monitoring network can be useful in studying columnar vortices in the lower atmosphere. Key Points Dust devil vortex appear in infrasound records Vortex pressure drop appears as "heartbeat" in high-pass pressure series Allows census of dust devil vortices ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84927797047&doi=10.1002%2f2015GL063237&partnerID=40&md5=969594bd00faf0191adffac858e559bf
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8485
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Johns Hopkins University, Applied Physics Laboratory, Laurel, MD, United States
Recommended Citation:
Lorenz R.D.,Christie D.. Dust devil signatures in infrasound records of the International Monitoring System[J]. Geophysical Research Letters,2015-01-01,42(6).