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
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DOI：
10.1029/2019gl086768
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发表时间：
2020-03-16
影响因子：
5.2
通讯作者：
McPhie, Jocelyn
中科院分区：
文献类型：
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作者：
Jutzcler, Martin;Marsh, Robert;McPhie, Jocelyn
2019年8月7日，在汤加群岛（西南太平洋）的一座无名海底火山，在海平面以下200米处产生了一个195公里（2）的安山浮石筏。木筏主要向西漂流，于9月19日抵达斐济群岛。早在喷发后2天就穿过木筏的游艇提供了木筏特征和原始样本的出色数据集。此外，特殊的跟踪筏分散的卫星图像，使我们能够对比虚拟粒子跟踪方法与海洋模型电流，探索表面电流，风和波浪作用的浮石漂浮物分散的相对影响超过2年。大而紧凑的浮石筏对海浪的衰减似乎减少了斯托克斯漂移的影响。将实时卫星观测与海洋学拉格朗日模拟相结合，可以对全球海洋灾害减灾进行近实时预报。
On the 7 August 2019, a 195 km(2) 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.