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Sensors 2017, 17(6), 1189;

Atmospheric Sampling on Ascension Island Using Multirotor UAVs

Department of Aerospace Engineering, University of Bristol, Bristol BS8 1TR, UK
School of Geographical Sciences, University of Bristol, Bristol BS8 1SS, UK
Cabot Institute, University of Bristol, Bristol BS8 1SS, UK
School of Geography, Earth & Environmental Sciences, University of Birmingham, Birmingham B15 2TT, UK
Royal Holloway, University of London, Egham TW20 0EX, UK
Author to whom correspondence should be addressed.
Academic Editors: Felipe Gonzalez Toro and Antonios Tsourdos
Received: 15 November 2016 / Revised: 9 May 2017 / Accepted: 15 May 2017 / Published: 23 May 2017
(This article belongs to the Special Issue UAV-Based Remote Sensing)
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As part of an NERC-funded project investigating the southern methane anomaly, a team drawn from the Universities of Bristol, Birmingham and Royal Holloway flew small unmanned multirotors from Ascension Island for the purposes of atmospheric sampling. The objective of these flights was to collect air samples from below, within and above a persistent atmospheric feature, the Trade Wind Inversion, in order to characterise methane concentrations and their isotopic composition. These parameters allow the methane in the different air masses to be tied to different source locations, which can be further analysed using back trajectory atmospheric computer modelling. This paper describes the campaigns as a whole including the design of the bespoke eight rotor aircraft and the operational requirements that were needed in order to collect targeted multiple air samples up to 2.5 km above the ground level in under 20 min of flight time. Key features of the system described include real-time feedback of temperature and humidity, as well as system health data. This enabled detailed targeting of the air sampling design to be realised and planned during the flight mission on the downward leg, a capability that is invaluable in the presence of uncertainty in the pre-flight meteorological data. Environmental considerations are also outlined together with the flight plans that were created in order to rapidly fly vertical transects of the atmosphere whilst encountering changing wind conditions. Two sampling campaigns were carried out in September 2014 and July 2015 with over one hundred high altitude sampling missions. Lessons learned are given throughout, including those associated with operating in the testing environment encountered on Ascension Island. View Full-Text
Keywords: Ascension Island; atmospheric sampling; methane; UAV; SUAS; multirotor; BVLOS Ascension Island; atmospheric sampling; methane; UAV; SUAS; multirotor; BVLOS

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Greatwood, C.; Richardson, T.S.; Freer, J.; Thomas, R.M.; MacKenzie, A.R.; Brownlow, R.; Lowry, D.; Fisher, R.E.; Nisbet, E.G. Atmospheric Sampling on Ascension Island Using Multirotor UAVs. Sensors 2017, 17, 1189.

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