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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Spreading and growth of contrails in a sheared environment
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Spreading and growth of contrails in a sheared environment

机译：在剪切环境中凝结尾迹的扩散和生长

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摘要

A case study of persistent contrail evolution in a sheared environment is simulated over time-scales of 15-180 min using a large-eddy simulation model with detailed microphysics. Model results are compared to satellite and in situ measurements of persistent contrails from the Subsonic Aircraft: Contrail and Cloud Effects Special Study (SUCCESS) experiment. In simulations with large ambient supersaturations and moderate wind shear, crystals with lengths >200 mu m are generated within 45 min by depositional growth. These crystals fall rapidly, and the contrail horizontal extent increases due to the wind shear. Strong radiative heating (with rates up to 10 K d(-1)) drives a local updraft and lofts the contrail core several hundred meters. The observed rate of contrail spreading and maintenance of optical depths larger than 0.05 can be approximately explained simply by growth and precipitation of ice crystals nucleated during the initial contrail formation if the environmental humidity is very high (relative humidity with respect to ice >125%). This result is consistent with observed high humidities in regions where persistent contrails formed during SUCCESS. [References: 24]
机译：使用具有详细微观物理学的大涡模拟模型，在15-180分钟的时间范围内，模拟了在剪切环境中持续轨迹转换的案例研究。将模型结果与“亚音速飞机：持续轨迹和云效应特殊研究（SUCCESS）”实验中持久凝结尾迹的卫星和原位测量结果进行比较。在具有较大的环境过饱和度和适度的风切变的模拟中，沉积生长会在45分钟内生成长度大于200微米的晶体。这些晶体迅速下落，并且由于风切变，凝结尾迹水平范围增加。强烈的辐射加热（速率高达10 K d（-1））驱动局部上升气流，并将转换轨迹放高数百米。如果环境湿度很高（如果相对湿度大于125％，相对于冰的相对湿度> 125％），则观察到的轨迹转换速率和大于0.05的光学深度维持率可以用在初始轨迹转换时成核的冰晶的生长和沉淀来简单地解释。 。该结果与在成功期间形成持续凝结尾迹的区域中观察到的高湿度一致。 [参考：24]

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