Impact of a gravity wave process on the upper stratospheric ozone valley on the Qinghai-Tibetan Plateau
Impact of a gravity wave process on the upper stratospheric ozone valley on the Qinghai-Tibetan Plateau
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DOI：
10.1007/s00704-023-04783-9
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发表时间：
2024-01
影响因子：
3.4
通讯作者：
Jundong Wang;Lingfeng Wan;Shujie Chang;Haotian He
中科院分区：
文献类型：
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作者：
Jundong Wang;Lingfeng Wan;Shujie Chang;Haotian He
大气重力波是一种重要的中小尺度振荡，它促进了大气中的物质交换。这些波动对青藏高原对流层上部和平流层下部的臭氧层有显著的影响。然而，重力波动力学过程对平流层上层臭氧的影响却鲜有研究。利用ECMWF再分析5（ERA 5）资料识别了青藏高原的重力波，分析了平流层上层臭氧对重力波的响应，并利用WRF模式模拟了重力波的动力传播机制。分析结果表明，2015年7月29日15：00 ~ 21：00 UTC期间，重力波从青藏高原地面（450 hPa）向上传播到平流层上层（20 − 3 hPa），呈弧形结构，并随高度向东倾斜。重力波信号于同日21：00 UTC开始减弱。受东风急流影响，7月30日02时30分重力波在3 hPa附近部分破碎，但重力波信号仍存在，并于04时完全破碎并释放能量。在此过程中，青藏高原20-3 hPa（平流层上部）臭氧对重力波的响应较好，臭氧混合比在部分破裂后30 min（UTC 03：00）开始下降。从04：00到05：00 UTC，臭氧急剧下降约0.014 ppmv。WRF的模拟结果与ERA 5的结果吻合良好，准确地捕捉到了重力波的复杂特征。此外，重力波的破裂导致臭氧总量下降0.024 ppmv。
Atmospheric gravity waves are essential meso-small-scale oscillations that facilitate material exchange within the atmosphere. These waves can significantly affect the ozone layer in the Upper Troposphere and Lower Stratosphere (UTLS) on the Qinghai-Tibetan Plateau. However, the influence of gravity wave dynamic processes on upper stratospheric ozone has rarely been studied. This paper identifies the gravity waves on the Tibetan Plateau based on ECMWF Reanalysis 5 (ERA5) data, analyzes the response of the upper stratospheric ozone to the event, and simulates the dynamic propagation mechanism of gravity waves by the Weather Research and Forecasting (WRF) model. This analysis reveals that between 15:00 and 21:00 UTC on July 29, 2015, gravity waves propagated from the surface of Tibetan Plateau (450 hPa) up to the upper stratosphere (20 − 3 hPa) in an arc-shaped structure and tilted to the east with height. The gravity wave signals started to weaken at 21:00 UTC on the same day. Influenced by the easterly rapids, gravity waves partially broke near 3 hPa at 02:30 UTC on July 30, but gravity wave signals were still present, and gravity waves completely broke and released energy at 04:00 UTC. During this process, ozone in the 20–3 hPa region (upper stratosphere) on the Qinghai-Tibetan Plateau responds well to gravity waves, and the ozone mixing ratio began to drop in ozone concentration 30 min after the partial breakup (03:00 UTC). The ozone dropped drastically by about 0.014 ppmv from 04:00 to 05:00 UTC. The WRF simulation results agree well with ERA5 and accurately capture the intricate characteristics of gravity waves. Furthermore, the breakup of gravity waves caused a total drop in ozone of 0.024 ppmv.