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首页> 外文期刊>Atmospheric chemistry and physics >Cirrus and water vapor transport in the tropical tropopause layer-Part 1: A specific case modeling study
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Cirrus and water vapor transport in the tropical tropopause layer-Part 1: A specific case modeling study

机译：热带对流层顶层中的卷云和水汽输送-第1部分：特定案例建模研究

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摘要

In a simulation of a tropical-tropopause-layer (TTL) cirrus forced by a large-scale equatorial Kelvin wave, the radiatively induced mesoscale dynamics of the cloud actively contributes to the transport of water vapor in the vertical direction. In a typical TTL cirrus, the heating that results from absorption of radiation by ice crystals induces a mesoscale circulation. Advection of water vapor by the radiatively induced circulation leads to upward advection of the cloudy air. Upward advection of the cloudy air is equivalent to upward transport of water vapor when the air above the cloud is drier than the cloudy air. On the other hand, ice nucleation and depositional growth, followed by sedimentation and sublimation lead to downward transport of water vapor. Under the conditions specific to our simulation, the upward transport of water vapor by the mesoscale circulation dominates the downward transport by microphysical processes. The net result is upward transport of water vapor, which is equivalent to hydration of the lower stratosphere. Sensitivity to model conditions and parameters will be discussed in a follow-up paper.
机译：在大型赤道开尔文波强迫下的热带对流层顶（TTL）卷云的模拟中，辐射诱发的云的中尺度动力学积极地促进了水蒸气在垂直方向上的传输。在典型的TTL卷云中，冰晶吸收辐射所产生的热量会引起中尺度循环。通过辐射诱导的循环对流的水蒸气导致多云的空气向上对流。当云层上方的空气比多云空气干燥时，多云空气的向上对流等效于水蒸气的向上传输。另一方面，冰的成核和沉积增长，然后是沉积和升华，导致水蒸气向下传输。在特定于我们的模拟的条件下，中尺度循环的水蒸气向上传输控制了微观物理过程的向下传输。最终结果是水蒸气向上传输，这相当于较低平流层的水合作用。对模型条件和参数的敏感性将在后续论文中讨论。

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