A model of the plumes above basaltic fissure eruptions
A model of the plumes above basaltic fissure eruptions
复制标题
玄武岩裂隙喷发上方的羽流模型
DOI：
10.1029/93gl01215
复制
发表时间：
1993
影响因子：
5.2
通讯作者：
A. Woods
中科院分区：
文献类型：
--
作者：
A. Woods
一个简单的模型的上升的挥发物以上玄武岩裂缝喷发表明，大气中的水分可能起着重要的作用，在注入挥发物高到大气中。由于周围的水蒸气被卷流夹带并向上携带，它会减压，并可能发生一些冷凝。这导致潜热的释放，使空气升温，从而增加了羽流的浮力，使其能够比干燥的大气层高出几公里。这种羽状物的高度也随着喷泉中细灰的质量分数而增加。虽然非常简单，模型的预测是在雅阁与历史上的喷发，包括1984年的冒纳罗亚火山喷发的烟羽高度的观察。
A simple model of the ascent of the volatiles above basaltic fissure eruptions shows that atmospheric moisture may play an important role in injecting volatiles high into the atmosphere. As ambient water vapour is entrained and carried upwards by the plume, it decompresses and some condensation may occur. This causes the release of latent heat which heats up the air and thereby increases the buoyancy of the plume enabling it to ascend several kilometres higher than in a dry atmosphere. The height of such plumes also increases with the mass fraction of fine ash in the fountain. Although very simple, the model predictions are in accord with observations of plume heights during historical eruptions including the 1984 eruption of Mauna Loa.