Evidence for diabatic cooling and poleward transport within and around the 1987 Antarctic ozone hole
Evidence for diabatic cooling and poleward transport within and around the 1987 Antarctic ozone hole
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1987 年南极臭氧空洞及其周围非绝热冷却和极地传输的证据
DOI：
10.1029/jd094id14p16797
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发表时间：
1989
影响因子：
--
通讯作者：
K. R. Chan
中科院分区：
文献类型：
--
作者：
M. Proffitt;K. Kelly;J. Powell;B. Gary;M. Loewenstein;J. R. Podolske;S. Strahan;K. R. Chan
结合现场测量的一氧化二氮，总水，和NO{sub y}与气象数据，包括位涡，在1987年的空中南极臭氧实验，一致的图片出现了一个逐渐向极运动的空气延伸约10{度}在纬度外的臭氧洞边界内约5{度}。数据分析集中在425-450 K的潜在温度范围内，对应于17.5-19 km的几何高度。整个地区正在进行的非绝热冷却的证据，和冷却速率约1.75 K的潜在温度每天（约0.8 K每天在恒定压力下的温度）计算的臭氧洞边界外的数据。的数据的解释，描述了来自低纬度的空气进入臭氧洞的运动，作为非绝热下降和螺旋极地。这种螺旋运动的结果是富含臭氧的空气的主要平流穿过边界并进入臭氧洞。这个简单的图像排除了需要广泛的等熵混合伴随着垂直下降，以保持陡峭的极向等熵梯度发现在一氧化二氮。数据表明，在低于425 K的潜在温度下，臭氧洞内平流层空气的流出是更必要的，并且在使命期间，在425 K至450 K之间，没有经过处理的空气穿过边界并流出臭氧洞。涉及角动量守恒的参数也被用来支持这个模型。«少
Combining in situ measurements of nitrous oxide, total water, and NO{sub y} with meteorological data, including potential vorticity, taken during the 1987 Airborne Antarctic Ozone Experiment, a consistent picture emerges of a gradual poleward movement of air extending from about 10{degree} in latitude outside the boundary of the ozone hole to about 5{degree} inside. The data analysis is concentrated in the potential temperature range of 425-450 K, corresponding to geometric altitudes of 17.5-19 km. Evidence of ongoing diabatic cooling throughout this region is presented, and cooling rates of about 1.75 K in potential temperature per day (approximately 0.8 K per day in temperature at constant pressure) are calculated from the data outside the boundary of the ozone hole. An interpretation of the data is presented that describes the movement of air that has come from lower latitudes into the ozone hole, as diabatically descending and spiraling poleward. The result of this spiraling motion is a dominantly advective flow of ozone rich air across the boundary and into the ozone hole. This simple picture precludes requiring extensive isentropic mixing with accompanying vertical descent to maintain the steep poleward isentropic gradients found in nitrous oxide. Data are presented to show that themore » necessary accompanying outflow of stratospheric air from within the ozone hole occurs at potential temperatures less than 425 K and that, during the mission, there was no significant transport of processed air across the boundary and out of the ozone hole from 425 to 450 K. Arguments involving conservation of angular momentum are also used to support this model.« less