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Sampling interplanetary dust from Antarctic air

Taylor, S. and Lever, J. H. and Burgess, K. D. and Stroud, R. M. and Brownlee, D. E. and Nittler, L. R. and Bardyn, A. and Alexander, C. M. O'D. and Farley, K. A. and Treffkorn, J. and Messenger, S. and Wozniakiewicz, P. J. (2020) Sampling interplanetary dust from Antarctic air. Meteoritics and Planetary Science, 55 (5). pp. 1128-1145. ISSN 1086-9379. doi:10.1111/maps.13483.

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We built a collector to filter interplanetary dust particles (IDPs) larger than 5 μm from the clean air at the Amundsen Scott South Pole station. Our sampling strategy used long duration, continuous dry filtering of near‐surface air in place of short duration, high‐speed impact collection on flags flown in the stratosphere. We filtered ~10⁷ m³ of clean Antarctic air through 20 cm diameter, 3 µm filters coupled to a suction blower of modest power consumption (5–6 kW). Our collector ran continuously for 2 years and yielded 41 filters for analyses. Based on stratospheric concentrations, we predicted that each month’s collection would provide 300–900 IDPs for analysis. We identified 19 extraterrestrial (ET) particles on the 66 cm² of filter examined, which represented ~0.5% of the exposed filter surfaces. The 11 ET particles larger than 5 µm yield about a fifth of the expected flux based on >5 µm stratospheric ET particle flux. Of the 19 ET particles identified, four were chondritic porous IDPs, seven were FeNiS beads, two were FeNi grains, and six were chondritic material with FeNiS components. Most were <10 µm in diameter and none were cluster particles. Additionally, a carbon‐rich candidate particle was found to have a small ¹⁵N isotopic enrichment, supporting an ET origin. Many other candidate grains, including chondritic glasses and C‐rich particles with Mg and Si and FeS grains, require further analysis to determine if they are ET. The vast majority of exposed filter surfaces remain to be examined.

Item Type:Article
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Nittler, L. R.0000-0002-5292-6089
Farley, K. A.0000-0002-7846-7546
Additional Information:© 2020 The Meteoritical Society. Issue Online: 15 July 2020; Version of Record online: 27 May 2020; Manuscript accepted: 24 March 2020; Manuscript revised: 23 March 2020; Manuscript received: 30 December 2019. We thank Dr. Jeff Grossman, NASA’s Emerging Worlds program manager, for funding this project and for added support provided by Dr. Scott Borg, NSF’s Antarctic Program manager. We thank our research associates Adam West (2017), Ta‐Lee Shue (2018), and Sheryl Seagraves (2019) who conscientiously monitored the operation of the collector and changed out the filters. Many people at South Pole helped to make this project a reality but a special thanks to Leah Street, our NSF science support coordinator and to Dan McCreight, our NSF logistics coordinator. We also thank our students Amanda Pinson and Summer Christenson from Dartmouth College and David Bour, an NRL SEAP student intern. Lastly, we thank Dr. Hope Ishii and an anonymous reviewer who provided comments that improved the paper. The authors have no conflict of interests that could affect the results presented in this paper.
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Issue or Number:5
Record Number:CaltechAUTHORS:20200527-131917889
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Official Citation:Taylor, S., Lever, J.H., Burgess, K.D., Stroud, R.M., Brownlee, D.E., Nittler, L.R., Bardyn, A., Alexander, C.M.O., Farley, K.A., Treffkorn, J., Messenger, S. and Wozniakiewicz, P.J. (2020), Sampling interplanetary dust from Antarctic air. Meteorit Planet Sci, 55: 1128-1145. doi:10.1111/maps.13483
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103496
Deposited By: Tony Diaz
Deposited On:27 May 2020 21:08
Last Modified:16 Nov 2021 18:22

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