Investigating vertical motion of small insects in the atmospheric boundary layer using millimetre-wavelength radar and Doppler LIDAR

Conference paper

Wainwright, C. E., Stepanian, P. M., Reynolds, D. R. and Reynolds, A. M. 2019. Investigating vertical motion of small insects in the atmospheric boundary layer using millimetre-wavelength radar and Doppler LIDAR. Institution of Engineering and Technology. doi:10.1049/joe.2019.0596

AuthorsWainwright, C. E., Stepanian, P. M., Reynolds, D. R. and Reynolds, A. M.
TypeConference paper
Abstract

It is well known in the meteorological community that millimetre-wavelength cloud radars contain considerable
contamination from aerial biota, and much of this comprises small weakly flying insects. Several methods have been explored for removing insect contamination from cloud radar data yet using this data to study the behaviour of insects remains a relatively unexplored area. Here, the authors describe the use of a collocated Ka-band cloud radar and Doppler LIDAR to study the vertical motion of small insects and investigate how this varies depending on the surrounding vertical air motion. We find that in the convective boundary layer, insects are largely concentrated in updrafts. During the daytime, small insects in downdrafts are found to descend at an average rate of 0.25 m s−1, yet insects caught in updrafts showed a descent response that was dependent upon the strength of the updraft in which they were embedded. Although the downward motion of the insects increased with increasing updraft strength, it was insufficient to overcome the rising motion in the updraft, i.e. in updrafts the insects ascend but at a slower speed than the surrounding air. We also report an ongoing efforts to extend this research to the nocturnal stable boundary layer.

KeywordsSmall insects; Dispersal; Radar
Year of Publication2019
Conference titleIET International Radar Conference
Conference locationNanjing, China
Event date17 Oct 2018
Digital Object Identifier (DOI)doi:10.1049/joe.2019.0596
Open accessPublished as bronze (free) open access
JournalJournal of Engineering
PublisherInstitution of Engineering and Technology
Funder project or codeBBSRC Strategic Programme in Smart Crop Protection
FunderBBSRC Industrial Strategy Challenge
Publisher's version
Output statusPublished
Publication dates
OnlineOct 2019
Publication process dates
Accepted08 May 2019

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