New insight in the Hawaiian plume swell dynamics from scaling laws
New insight in the Hawaiian plume swell dynamics from scaling laws
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从尺度定律对夏威夷羽流膨胀动力学的新认识
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
S. Zhong
中科院分区：
文献类型：
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作者：
J. van Hunen;S. Zhong
夏威夷羽流膨胀的形成和形状变化的数值重新检查。羽流浮力通量和膨胀的宽度和高度的标度律有助于获得新的见解膨胀形成和相关的模型参数，如羽流温度和大小，地幔流变学之间的关系。羽流浮力F = Aη0−1.2Rp3.5Δ Tp 2.2 exp（1.3 × 10−8EΔTp）的标度律，与背景地幔粘度η0、羽流半径Rp、羽流超额温度ΔTp和活化能E在8%以内符合数值通量测量。涌浪宽度和涌浪高度的标度律具有相似的形式，它们的乘积在10%以内类似于浮力通量标度律。这些标度律表明，背景地幔粘度起着重要的作用，而夏威夷羽强度的增加，2025年前是由于羽过度温度增加了50%。
The formation and shape variation of the Hawaiian plume swell is re‐examined numerically. Scaling laws for the plume buoyancy flux and swell width and height help gaining new insight in relationships between swell formation and relevant model parameters, like plume temperature and size, and mantle rheology. A scaling law for the plume buoyancy F = Aη0−1.2Rp3.5ΔTp2.2 exp(1.3 × 10−8EΔTp), with background mantle viscosity η0, plume radius Rp, plume excess temperature ΔTp, and activation energy E fits numerical flux measurements within 8%. Scaling laws for the swell width and height have similar forms, and their multiplication resembles the buoyancy flux scaling law within 10%. These scaling laws suggest that the background mantle viscosity plays a significant role, and that the increased Hawaiian plume intensity ∼25 Ma ago is due to a plume excess temperature increase of 50%.