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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >DESCENT OF LONG-LIVED TRACE GASES IN THE WINTER POLAR VORTEX
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DESCENT OF LONG-LIVED TRACE GASES IN THE WINTER POLAR VORTEX

机译：冬季极涡中长寿命痕量气体的下降

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摘要

Recent observations of CH4 and HF from the UARS Halogen Limb Occultation Experiment (HALOE) suggest that vigorous descent occurs within the polar winter vortex with ''mesospheric'' values of CH4 evident down to 30 mbar. This study shows that a highly accurate two-dimensional model advection scheme coupled with a modern radiation scheme, parameterized planetary and gravity wave drag algorithms can produce tracer distributions consistent with HALOE observations. The modeled tracer distribution within the polar vortex is found to be principally dependent on the strength of dynamical drag in the middle atmosphere and the strength of the planetary wave forcing. However, the strong downward transport of tracers at the poles during winter can be disrupted in midwinter by planetary wave mixing. Thus the weaker planetary wave forcing in the southern hemisphere winter allows for a more coherent descent of long-lived tracers from the mesosphere than during the northern hemisphere winter. Multiple-year integrations of the model reveal a general circulation of the stratosphere which lofts tracers to mesospheric altitudes. Material removed from the mesosphere returns to the stratosphere principally within the polar regions. Upward vertical transport of material is found to be enhanced by horizontal planetary wave mixing. [References: 31]
机译：UARS卤素四肢潜伏实验（HALOE）对CH4和HF的最新观察表明，极地冬季涡旋中剧烈下降，CH4的“中层”值明显下降至30 mbar。这项研究表明，高精度二维模型对流方案与现代辐射方案，参数化行星和重力波阻力算法相结合，可以产生与HALOE观测值一致的示踪剂分布。发现在极涡中建模的示踪剂分布主要取决于中间大气中的动态阻力强度和行星波强迫的强度。但是，冬季中极点的示踪剂在向下的强烈向下传输可能会在仲冬受到行星波混合的干扰。因此，与北半球冬季相比，南半球冬季的行星波强迫更弱，使得中空层长寿命示踪剂的下降更为连贯。该模型的多年积分揭示了平流层的总体环流，使示踪剂升至中层高度。从中层层去除的物质主要在极地区域内返回平流层。发现材料的垂直向上传输通过水平行星波混合得到增强。 [参考：31]

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