TY - JOUR
T1 - Development and characterization of a high-efficiency, aircraft-based axial cyclone cloud water collector
AU - Crosbie, Ewan
AU - Brown, Matthew D.
AU - Shook, Michael
AU - Ziemba, Luke
AU - Moore, Richard H.
AU - Shingler, Taylor
AU - Winstead, Edward
AU - Lee Thornhill, K.
AU - Robinson, Claire
AU - Macdonald, Alexander B.
AU - Dadashazar, Hossein
AU - Sorooshian, Armin
AU - Beyersdorf, Andreas
AU - Eugene, Alexis
AU - Collett, Jeffrey
AU - Straub, Derek
AU - Anderson, Bruce
N1 - Funding Information:
Acknowledgements. This research was funded by NASA’s Radiation Sciences and Tropospheric Chemistry Programs, as well as NASA’s Earth Venture-2 Program through the Earth System Science Pathfinder (ESSP) Program Office. Twin Otter campaigns and data analysis were supported by Office of Naval Research grants N00014-10-1-0811, N00014-11-1-0783, N00014-10-1-0200, N00014-04-1-0118, and N00014-16-1-2567. Matthew D. Brown acknowledges support from the NASA Postdoctoral Program, ABM acknowledges support from the Mexican National Council for Science and Technology (CONACyT). We wish to thank the ESSP Program Office and Mary Kleb for their support throughout the NAAMES deployments. The authors would also like to acknowledge the contributions of Brian Beaton, Terry Clark, R. Eric Dyke, David Fahringer, Robert Wagner, and Wayne Welch during the probe design and fabrication. We also wish to thank Monica Chance and Martin Nowicki for their support related to C-130 engineering and operations, Haflidi Jonsson for support with Twin Otter operations, and we would like to express deep appreciation to the pilots and flight crew of both aircraft. The authors also acknowledge the helpful review of the manuscript by Marcelo Guzman, Darrel Baumgardner, and an anonymous reviewer.
Publisher Copyright:
© Author(s) 2018.
PY - 2018/9/5
Y1 - 2018/9/5
N2 - A new aircraft-mounted probe for collecting samples of cloud water has been designed, fabricated, and extensively tested. Following previous designs, the probe uses inertial separation to remove cloud droplets from the airstream, which are subsequently collected and stored for offline analysis. We report details of the design, operation, and modelled and measured probe performance.Computational fluid dynamics (CFD) was used to understand the flow patterns around the complex interior geometrical features that were optimized to ensure efficient droplet capture. CFD simulations coupled with particle tracking and multiphase surface transport modelling provide detailed estimates of the probe performance across the entire range of flight operating conditions and sampling scenarios.Physical operation of the probe was tested on a Lockheed C-130 Hercules (fuselage mounted) and de Havilland Twin Otter (wing pylon mounted) during three airborne field campaigns. During C-130 flights on the final field campaign, the probe reflected the most developed version of the design and a median cloud water collection rate of 4.5 mL minĝ'1 was achieved. This allowed samples to be collected over 1-2 min under optimal cloud conditions. Flights on the Twin Otter featured an inter-comparison of the new probe with a slotted-rod collector, which has an extensive airborne campaign legacy. Comparison of trace species concentrations showed good agreement between collection techniques, with absolute concentrations of most major ions agreeing within 30 %, over a range of several orders of magnitude..
AB - A new aircraft-mounted probe for collecting samples of cloud water has been designed, fabricated, and extensively tested. Following previous designs, the probe uses inertial separation to remove cloud droplets from the airstream, which are subsequently collected and stored for offline analysis. We report details of the design, operation, and modelled and measured probe performance.Computational fluid dynamics (CFD) was used to understand the flow patterns around the complex interior geometrical features that were optimized to ensure efficient droplet capture. CFD simulations coupled with particle tracking and multiphase surface transport modelling provide detailed estimates of the probe performance across the entire range of flight operating conditions and sampling scenarios.Physical operation of the probe was tested on a Lockheed C-130 Hercules (fuselage mounted) and de Havilland Twin Otter (wing pylon mounted) during three airborne field campaigns. During C-130 flights on the final field campaign, the probe reflected the most developed version of the design and a median cloud water collection rate of 4.5 mL minĝ'1 was achieved. This allowed samples to be collected over 1-2 min under optimal cloud conditions. Flights on the Twin Otter featured an inter-comparison of the new probe with a slotted-rod collector, which has an extensive airborne campaign legacy. Comparison of trace species concentrations showed good agreement between collection techniques, with absolute concentrations of most major ions agreeing within 30 %, over a range of several orders of magnitude..
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U2 - 10.5194/amt-11-5025-2018
DO - 10.5194/amt-11-5025-2018
M3 - Article
AN - SCOPUS:85053065814
VL - 11
SP - 5025
EP - 5048
JO - Atmospheric Measurement Techniques
JF - Atmospheric Measurement Techniques
SN - 1867-1381
IS - 9
ER -