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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >MODIFIED LAGRANGIAN-MEAN DIAGNOSTICS OF THE STRATOSPHERIC POLAR VORTICES .2. NITROUS OXIDE AND SEASONAL BARRIER MIGRATION IN THE CRYOGENIC LIMB ARRAY ETALON SPECTROMETER AND SKYHI GENERAL CIRCULATION MODEL
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MODIFIED LAGRANGIAN-MEAN DIAGNOSTICS OF THE STRATOSPHERIC POLAR VORTICES .2. NITROUS OXIDE AND SEASONAL BARRIER MIGRATION IN THE CRYOGENIC LIMB ARRAY ETALON SPECTROMETER AND SKYHI GENERAL CIRCULATION MODEL

机译：改良的平流球极耳腔拉格朗日均值诊断法; 2。低温下肢阵列标量谱仪中的一氧化二氮和季节壁垒迁移及SKYHI总循环模型

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The Lagrangian-mean transport and mixing properties associated with the life cycle of the stratospheric polar vortices are analyzed using nitrous oxide (N2O) as a tracer, both observed by the cryogenic limb array etalon spectrometer (CLAES) and simulated by the Geophysical Fluid Dynamics Laboratory SKYHI general circulation model. Based on the modified Lagrangian-mean (MLM) diagnostic formalism, the area equivalent latitude-potential temperature cross sections are constructed for the N2O mixing ratio and the squared equivalent length, a Lagrangian equivalence of the eddy diffusion coefficient K-yy. The robustness of the analysis is tested and confirmed by subsampling the SKYHI tracer field at a CLAES-equivalent resolution and comparing the result with the full-resolution analysis. The seasonal and interhemispheric variabilities of the MLM cross sections an examined in detail. Both CLAES and SKYHI identify two major barriers to horizontal mixing (minimal equivalent length) in both hemispheres: a perennial subtropical barrier and an annual polar barrier. The polar barrier splits from the subtropical barrier in fall: migrates poleward in winter, and disappears at the demise of the polar vortex. The barriers are in general collocated with st tracer edge (concentrated gradients), but larger gradients do not necessarily translate to a greater barrier. For example, at the Arctic vortex edge, where the tracer gradients are greater than at the Antarctic vortex edge, the barrier is actually weaker. A significant difference is found in the structure of the barriers between the two northern hemisphere winters examined. [References: 45]
机译：使用一氧化二氮（N2O）作为示踪剂分析了与平流层极涡旋的生命周期相关的拉格朗日均值输运和混合特性，二者均由低温肢体阵列标准具光谱仪（CLAES）观测并由地球物理流体动力学实验室模拟SKYHI普通流通模型。基于修正的拉格朗日均值（MLM）诊断形式，构造了N2O混合比和平方当量长度，涡流扩散系数K-yy的拉格朗日当量的面积当量纬势温度剖面。通过以等效于CLAES的分辨率对SKYHI示踪剂场进行二次采样并将结果与​​全分辨率分析进行比较，来测试和确认分析的稳健性。详细检查了传销截面的季节和半球间变化。 CLAES和SKYHI都确定了两个半球水平混合的两个主要障碍（最小等效长度）：多年生亚热带障碍和年极障碍。极地屏障在秋天从亚热带屏障中分裂出来：在冬天向极地迁移，并在极地涡旋消亡时消失。障碍通常与st示踪物边缘并置（集中的梯度），但是较大的梯度不一定会转化为较大的障碍。例如，在示踪剂梯度大于南极涡旋边缘的北极涡旋边缘处，势垒实际上较弱。发现两个北半球冬季之间的屏障结构存在显着差异。 [参考：45]

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