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Ongoing dispersal of the 7 August 2019 pumice raft from the Tonga Arc in the Southwestern Pacific Ocean

Ongoing dispersal of the 7 August 2019 pumice raft from the Tonga Arc in the Southwestern Pacific Ocean
Ongoing dispersal of the 7 August 2019 pumice raft from the Tonga Arc in the Southwestern Pacific Ocean
On the 7 August 2019, a 195 km2 raft of andesitic pumice was produced at 200 m below sea level at an unnamed submarine volcano in the Tonga Islands (Southwest Pacific Ocean). Drifting chiefly westward, the raft reached the Fiji Islands on the 19 September. Yachts that crossed the raft as early as 2 days post‐eruption provided an outstanding data set of raft characteristics and pristine samples. Further, exceptional tracking of raft dispersal by satellite images allows us to contrast virtual particle tracking methods with ocean model currents to explore the relative influence of surface currents, wind, and wave action on pumice flotsam dispersal over up to 2 years. Attenuation of ocean waves by large and compact pumice rafts appears to reduce the effect of Stokes drift. The coupling of real‐time satellite observations with oceanographic Lagrangian simulations allows near‐real time forecasting for global maritime hazard mitigation.
Eruption, Hazard, Oceanographic model, Pumice raft, Submarine volcanism, Tonga
0094-8276
Jutzeler, Martin
3ff7423b-ed16-439c-ad5b-1822b72d7b8c
Marsh, Robert
702c2e7e-ac19-4019-abd9-a8614ab27717
Sebille, Erik
4aec956c-2a78-4f85-8ead-4c943ac31662
Mittal, Tushar
88a76c28-20f6-444a-8b3d-6830b01799b2
Carey, Rebecca J.
8c5d6a25-3bd6-4de1-8045-e3b3eafdffdc
Fauria, Kristen E.
91738288-c425-451b-8722-876a4f132248
Manga, Michael
924be86d-0d11-410f-be8e-a3cf637af295
Mcphie, Jocelyn
55a4dd37-008b-441f-91ce-f7ff5bffc9a0
Jutzeler, Martin
3ff7423b-ed16-439c-ad5b-1822b72d7b8c
Marsh, Robert
702c2e7e-ac19-4019-abd9-a8614ab27717
Sebille, Erik
4aec956c-2a78-4f85-8ead-4c943ac31662
Mittal, Tushar
88a76c28-20f6-444a-8b3d-6830b01799b2
Carey, Rebecca J.
8c5d6a25-3bd6-4de1-8045-e3b3eafdffdc
Fauria, Kristen E.
91738288-c425-451b-8722-876a4f132248
Manga, Michael
924be86d-0d11-410f-be8e-a3cf637af295
Mcphie, Jocelyn
55a4dd37-008b-441f-91ce-f7ff5bffc9a0

Jutzeler, Martin, Marsh, Robert, Sebille, Erik, Mittal, Tushar, Carey, Rebecca J., Fauria, Kristen E., Manga, Michael and Mcphie, Jocelyn (2020) Ongoing dispersal of the 7 August 2019 pumice raft from the Tonga Arc in the Southwestern Pacific Ocean. Geophysical Research Letters, 47 (5), [e1701121]. (doi:10.1029/2019GL086768).

Record type: Article

Abstract

On the 7 August 2019, a 195 km2 raft of andesitic pumice was produced at 200 m below sea level at an unnamed submarine volcano in the Tonga Islands (Southwest Pacific Ocean). Drifting chiefly westward, the raft reached the Fiji Islands on the 19 September. Yachts that crossed the raft as early as 2 days post‐eruption provided an outstanding data set of raft characteristics and pristine samples. Further, exceptional tracking of raft dispersal by satellite images allows us to contrast virtual particle tracking methods with ocean model currents to explore the relative influence of surface currents, wind, and wave action on pumice flotsam dispersal over up to 2 years. Attenuation of ocean waves by large and compact pumice rafts appears to reduce the effect of Stokes drift. The coupling of real‐time satellite observations with oceanographic Lagrangian simulations allows near‐real time forecasting for global maritime hazard mitigation.

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Accepted/In Press date: 13 February 2020
e-pub ahead of print date: 18 February 2020
Published date: 16 March 2020
Keywords: Eruption, Hazard, Oceanographic model, Pumice raft, Submarine volcanism, Tonga

Identifiers

Local EPrints ID: 439276
URI: http://eprints.soton.ac.uk/id/eprint/439276
ISSN: 0094-8276
PURE UUID: a2db55b0-04a0-44c9-8317-691ced689a5d

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Date deposited: 07 Apr 2020 16:32
Last modified: 28 Apr 2022 05:52

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Contributors

Author: Martin Jutzeler
Author: Robert Marsh
Author: Erik Sebille
Author: Tushar Mittal
Author: Rebecca J. Carey
Author: Kristen E. Fauria
Author: Michael Manga
Author: Jocelyn Mcphie

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