Satellite observations and modeling of transport in the upper troposphere through the lower mesosphere during the 2006 major stratospheric sudden warming
Satellite observations and modeling of transport in the upper troposphere through the lower mesosphere during the 2006 major stratospheric sudden warming
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DOI：
10.5194/acp-9-4775-2009
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发表时间：
2009-07
影响因子：
6.3
通讯作者：
G. Manney;R. Harwood;I. MacKenzie;K. Minschwaner;D. Allen;M. Santee;K. Walker;M. Hegglin;A. Lambert;H. Pumphrey;P. Bernath;C. Boone;M. Schwartz;N. Livesey;W. Daffer;R. Fuller
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文献类型：
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作者：
G. Manney;R. Harwood;I. MacKenzie;K. Minschwaner;D. Allen;M. Santee;K. Walker;M. Hegglin;A. Lambert;H. Pumphrey;P. Bernath;C. Boone;M. Schwartz;N. Livesey;W. Daffer;R. Fuller
抽象的。2006年1月的一次异常强烈和持续的平流层突然变暖是第一次主要的平流层突然变暖，全球分布的长寿命痕量气体数据可用于覆盖对流层上部到中间层下部。我们使用Aura微波临边探测器（MLS），大气化学实验傅立叶变换光谱仪（ACE-FTS）数据，SLIMCAT化学传输模式（CTM），同化气象分析，提供了一个全面的图片运输在这一事件。触发SSW的上对流层脊与升高的对流层顶和分层的微量气体剖面与平流层和对流层入侵。异常极向传输（与相应的准等熵对流层到平流层交换在最低层次的研究）在该地区的脊延伸到平流层低。在平流层中上部，极涡输送障碍的崩溃被认为是在微量气体，包括CO，H2O，CH 4和N2 O的快速，广泛的混合的签名。气旋在平流层下部的破裂时间稍晚，速度也比平流层中部要慢。在平流层中、低层，具有SSW前涡旋特征的微量气体值的小残留物在涡旋的弱而缓慢的恢复过程中徘徊。上层平流层涡旋迅速重组，并且，随着增强的非绝热下降设置，CO下降到这个强涡旋，呼应了秋季涡旋的发展。从对流层上部到平流层中部，SLIMCAT CTM中的痕量气体演化与卫星痕量气体资料中的演化一致。在平流层上部和中间层下部，SLIMCAT模拟没有捕捉到中间层CO和H2O值的强烈下降到改造涡;这种不良的CTM性能在平流层上部和中间层下部的结果主要是从偏差的非绝热下降同化分析。
Abstract. An unusually strong and prolonged stratospheric sudden warming (SSW) in January 2006 was the first major SSW for which globally distributed long-lived trace gas data are available covering the upper troposphere through the lower mesosphere. We use Aura Microwave Limb Sounder (MLS), Atmospheric Chemistry Experiment-Fourier Transform Spectrometer (ACE-FTS) data, the SLIMCAT Chemistry Transport Model (CTM), and assimilated meteorological analyses to provide a comprehensive picture of transport during this event. The upper tropospheric ridge that triggered the SSW was associated with an elevated tropopause and layering in trace gas profiles in conjunction with stratospheric and tropospheric intrusions. Anomalous poleward transport (with corresponding quasi-isentropic troposphere-to-stratosphere exchange at the lowest levels studied) in the region over the ridge extended well into the lower stratosphere. In the middle and upper stratosphere, the breakdown of the polar vortex transport barrier was seen in a signature of rapid, widespread mixing in trace gases, including CO, H2O, CH4 and N2O. The vortex broke down slightly later and more slowly in the lower than in the middle stratosphere. In the middle and lower stratosphere, small remnants with trace gas values characteristic of the pre-SSW vortex lingered through the weak and slow recovery of the vortex. The upper stratospheric vortex quickly reformed, and, as enhanced diabatic descent set in, CO descended into this strong vortex, echoing the fall vortex development. Trace gas evolution in the SLIMCAT CTM agrees well with that in the satellite trace gas data from the upper troposphere through the middle stratosphere. In the upper stratosphere and lower mesosphere, the SLIMCAT simulation does not capture the strong descent of mesospheric CO and H2O values into the reformed vortex; this poor CTM performance in the upper stratosphere and lower mesosphere results primarily from biases in the diabatic descent in assimilated analyses.