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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Mechanisms for pollutant transport between the boundary layer and the free troposphere
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Mechanisms for pollutant transport between the boundary layer and the free troposphere

机译：边界层与对流层之间污染物传输的机理

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Pollutants are longer-lived in the free troposphere than the boundary layer, hence the transport of pollutants from the boundary layer to the free troposphere has significant implications for long-range transport and global warming. It is important to quantify the transport of air between the boundary layer and the free troposphere and to understand the role different meteorological mechanisms play, Idealised passive tracer experiments, with tracer initially only in the boundary layer, are performed in a numerical model for three case study days with different synoptic conditions. After 24 hours, more than 50% of the tracer resides in the free troposphere for the two frontal cases, and 40% resides there for the high-pressure case. The tracer was transported to maximum heights of 8 km, To elucidate the role of different mechanisms for each case, the tracer amount transported by advection only, advection and turbulent mixing, and advection and convection was calculated. Advection is found to be the most important mechanism in transporting the tracer to the free troposphere; however, the addition of upright convection and turbulent mixing increases the amount by up to 24% with convection transporting the tracer to heights of 5 km. The inclusion of convection and turbulent mixing to the advection are not linearly additive processes. This study shows the possibility of a large proportion of the pollutant emitted in the boundary layer being transported to the free troposphere in a short time and the importance of representing all the meteorological processes. [References: 37]
机译：污染物在自由对流层中的寿命比边界层长，因此污染物从边界层到自由对流层的迁移对远距离迁移和全球变暖具有重要意义。量化边界层和自由对流层之间的空气传输并了解不同的气象机制所起的作用非常重要。理想的被动示踪剂实验（最初仅在边界层进行示踪）是在三种情况下的数值模型中进行的学习天数不同的天气情况。 24小时后，对于两种额叶情况，超过50％的示踪剂驻留在自由对流层中，而对于高压情况，超过40％的示踪剂驻留在对流层中。示踪剂的最大运输高度为8 km。为了阐明每种情况下不同机制的作用，仅通过对流，对流和湍流混合以及对流和对流来计算示踪剂的运输量。对流是将示踪剂运至对流层的最重要机制。但是，随着对流将示踪剂输送到5 km的高度，垂直对流和湍流混合的添加使量最多增加了24％。对流包括对流和湍流混合不是线性累加过程。这项研究表明，在边界层中排放的大部分污染物有可能在短时间内被输送到对流层，并代表了所有气象过程的重要性。 [参考：37]

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