Characteristics of Atmospheric Wave‐Induced Laminae Observed by Ozonesondes at the Southern Tip of South America
Characteristics of Atmospheric Wave‐Induced Laminae Observed by Ozonesondes at the Southern Tip of South America
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南美洲南端臭氧探空仪观测到的大气波诱发纹层特征
DOI：
10.1029/2018jd028707
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Benitez G. C.
中科院分区：
文献类型：
--
作者：
Ohyama H.;Mizuno A.;Zamorano F.;Sugita T.;Akiyoshi H.;Noguchi K.;Wolfram E.;Salvador J.;Benitez G. C.
在臭氧探测剖面中经常发现几公里尺度的臭氧浓度波动（即臭氧层）。我们利用在南美洲南端进行的臭氧探空仪测量，研究了靠近极地涡旋边缘和安第斯山脉背风侧的臭氧层与大气波之间的关系。层流结构是由重力波引起的等线的垂直和水平位移以及罗斯比波破碎引起的低臭氧浓度涡旋气丝的等熵平流形成的。我们通过对观测到的臭氧剖面应用高通滤波器并将其归一化为背景浓度来提取这些臭氧波动的成分，背景浓度由低通滤波器提取。用实验数据分别评价了由引力波引起的位移引起的臭氧波动。我们假设观测到的和引力波引起的波动之间的残差是罗斯比波引起的波动。在对流层上层重力波诱发的变率大于平流层下层，并在冬季达到最大值。罗斯比波引起的变率在平流层下层表现出明显的季节性模式，并占观测到的变率的很大一部分。我们还研究了重力波和罗斯比波引起的臭氧变率与探空仪位置和极涡边缘等效纬度的差异之间的关系。我们发现极地涡旋内部的变化比外部大。
Fluctuations of ozone concentrations with dimensions of a few kilometers (i.e., ozone laminae) are frequently found in ozone‐sounding profiles. We used ozonesonde measurements made at the southern tip of South America to examine the relationship between ozone laminae and atmospheric waves near the edge of the polar vortex and on the leeward side of the Andes Mountains. Laminar structures are formed by vertical and horizontal displacements of isopleths due to gravity waves and by isentropic advection of vortex air filaments with low ozone concentration due to Rossby wave breaking. We extracted components of these ozone fluctuations by applying a high‐pass filter to the observed ozone profiles and normalizing them to background concentrations, which were extracted with a low‐pass filter. Ozone fluctuations due to displacements caused by gravity waves were individually evaluated with experimental data. We assumed that the residuals between the observed and gravity wave‐induced fluctuations were Rossby waves‐induced fluctuations. We found that the gravity wave‐induced variability was larger in the upper troposphere than in the lower stratosphere and was a maximum in winter. Rossby wave‐induced variability showed a distinct seasonal pattern in the lower stratosphere and accounted for a large portion of the observed variability. We also examined the relationship between gravity wave‐induced and Rossby wave‐induced ozone variability and the differences in equivalent latitudes between the sonde positions and the polar vortex edge. We found that variability was larger inside than outside the polar vortex.
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DOI：
--
发表时间：
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DOI：
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发表时间：
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