Stratospheric contribution to the summertime high surface ozone events over the western united states

Stratospheric contribution to the summertime high surface ozone events over the western united states
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平流层对美国西部夏季高表面臭氧事件的贡献

DOI:
10.1088/1748-9326/abba53
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发表时间:
2020
影响因子:
6.7
通讯作者:
Tilmes, Simone
Tilmes, Simone
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Wang, Xinyue;Wu, Yutian;Randel, William;Tilmes, Simone

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平流层对夏季高地面臭氧(O3)事件的影响进行了研究,使用全大气社区气候模式的20年模拟。我们发现,从平流层输送的O3作出了显着的贡献,地面O3变化的背景下,地面O3超过第95百分位数,特别是在美国西部最大协方差分析适用于O3异常配对平流层O3示踪剂异常,以确定平流层入侵和潜在的动力学机制。第一个主导模态对应于美国西部和北方平流层的深层侵入,以及沿西海岸沿着对流层中低层的东北风加强,这也有利于向东太平洋的输送。第二种主导模式对应于山间地区的深部侵入体。这两种模式都与向东传播的斜压系统有关,斜压系统在北太平洋风暴路径末端附近被放大,导致美国西部强烈下降
The stratospheric influence on summertime high surface ozone (O3) events is examined using a twenty-year simulation from the Whole Atmosphere Community Climate Model. We find that O3 transported from the stratosphere makes a significant contribution to the surface O3 variability where background surface O3 exceeds the 95th percentile, especially over western US Maximum covariance analysis is applied to O3 anomalies paired with stratospheric O3 tracer anomalies to identify the stratospheric intrusion and the underlying dynamical mechanism. The first leading mode corresponds to deep stratospheric intrusions in the western and northern tier of the US, and intensified northeasterlies in the mid-to-lower troposphere along the west coast, which also facilitate the transport to the eastern Pacific Ocean. The second leading mode corresponds to deep intrusions over the Intermountain Regions. Both modes are associated with eastward propagating baroclinic systems, which are amplified near the end of the North Pacific storm tracks, leading to strong descents over the western US
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发表时间: 2016-11
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