I was researching more into the studies done by Kjaer and his team ( https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6235527/ ) concerning the hypothesis about the Younger Dryas impact crater named Hiawatha in Greenland and its dating. Another study by Pino et al. ( https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6416299/ ) proposes that some of the Younger Dryas Boundary located in Chile could potentially be associated with the impact of Hiawatha and travel of impact ejecta.
Regardless of the pending measurements of the exact age of the meteoric rock located under the Ice Sheet to confirm age, my question is this: did the ejecta travel through the atmospheric circulation, which I find to be a possibility due to the polar vortex air currents carrying it over the North Pole, or was it simply from the explosive force which the meteorite was theorized to fall with? I know that with eruptions like St. Helens volcanic ash can circulate far and wide through the atmosphere, but with the amount found in Chile would this more line up with a blanketing of ejecta or just trace amounts finding its way there?
Kjær KH, Larsen NK, Binder T, Bjørk AA, Eisen O, Fahnestock MA, Funder S, Garde AA, Haack H, Helm V, Houmark-Nielsen M, Kjeldsen KK, Khan SA, Machguth H, McDonald I, Morlighem M, Mouginot J, Paden JD, Waight TE, Weikusat C, Willerslev E, MacGregor JA. (2018). A large impact crater beneath Hiawatha Glacier in northwest Greenland. Sci Adv. 2018 Nov 14;4(11):eaar8173. doi: 10.1126/sciadv.aar8173.
Pino, M., Abarzúa, A. M., Astorga, G., Martel-Cea, A., Cossio-Montecinos, N., Navarro, R. X., Lira, M. P., Labarca, R., LeCompte, M. A., Adedeji, V., Moore, C. R., Bunch, T. E., Mooney, C., Wolbach, W. S., West, A., & Kennett, J. P. (2019). Sedimentary record from Patagonia, southern Chile supports cosmic-impact triggering of biomass burning, climate change, and megafaunal extinctions at 12.8 ka. Scientific reports, 9(1), 4413. https://doi.org/10.1038/s41598-018-38089-y