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Why Some Volcanic Ash Clouds Disrupt Air Travel More Than Others
为何某些火山灰云对航空运输影响更大
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Volcanic ash clouds vary in danger based on particle size, silica content, and altitude.火山灰云的危险程度取决于颗粒大小、二氧化硅含量和高度。
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Fine ash particles under 63 micrometers melt inside jet engines and coat turbine blades.粒径小于63微米的细灰颗粒会在喷气发动机内熔化并附着在涡轮叶片上。
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High-silica ash, like that from Mount St. Helens, becomes glassy when heated to 1,000°C.高二氧化硅灰（如圣海伦斯火山喷发物）在加热至1000°C时会变成玻璃状。
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Ash plumes reaching cruising altitudes (9–12 km) pose the greatest risk to commercial flights.升至巡航高度（9–12公里）的火山灰羽流对民航飞行构成最大风险。
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Satellites track sulfur dioxide emissions to estimate ash concentration and dispersion.卫星通过监测二氧化硫排放量来估算火山灰浓度与扩散范围。
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Pilots avoid ash clouds using volcanic ash advisory centers and real-time radar data.飞行员依靠火山灰咨询中心和实时雷达数据避开火山灰云。
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Even low-concentration ash can erode cockpit windows and damage avionics over time.即使低浓度火山灰，长期也会侵蚀驾驶舱窗户并损坏航电设备。
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Computer models simulate ash transport using wind patterns and eruption column height.计算机模型结合风场和喷发柱高度模拟火山灰输送路径。
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Regulatory agencies require mandatory engine testing with simulated ash before certification.监管机构要求飞机发动机在认证前必须通过模拟火山灰的强制测试。
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This science explains why some eruptions ground thousands of flights while others cause minimal disruption.这一科学原理解释了为何某些火山喷发导致数千航班停飞，而另一些则影响甚微。