Detection of stratospheric intrusion events and their role in ozone enhancement at a mountain background site in sub-tropical East Asia

被引：11

作者：

Ou-Yang, Chang-Feng ^{[1
]}

Babu, Saginela Ravindra ^{[1
]}

Lee, Jia-Ren ^{[2
]}

Yen, Ming-Cheng ^{[1
]}

Griffith, Stephen M. ^{[1
]}

Lin, Chia-Ching ^{[1
]}

Chang, Shuenn-Chin ^{[3
]}

Lin, Neng-Huei ^{[1
,4
]}

机构：

[1] Natl Cent Univ, Dept Atmospher Sci, Taoyuan 32001, Taiwan

[2] Natl Cent Univ, Dept Chem, Taoyuan 32001, Taiwan

[3] Environm Protect Adm, Taipei 10042, Taiwan

[4] Natl Cent Univ, Ctr Environm Monitoring & Technol, Taoyuan 32001, Taiwan

来源：

ATMOSPHERIC ENVIRONMENT | 2022年 / 268卷

关键词：

Stratospheric intrusion (SI); Tropopause folding; Rossby wave breaks; Ozone; East Asia; Typhoon; TROPOSPHERIC OZONE; CARBON-MONOXIDE; SURFACE OZONE; POTENTIAL-VORTICITY; GLOBAL CLIMATOLOGY; TROPOPAUSE FOLDS; TRANSPORT; AIR; MONSOON; STATION;

D O I：

10.1016/j.atmosenv.2021.118779

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

In this study, we investigated the influences of stratospheric intrusion (SI) on the tropospheric ozone (O-3) at Lulin Atmospheric Background Station (LABS, 2862 m MSL), a representative high-altitude site in East Asia. Thresholds for surface O-3, carbon monoxide (CO), and relative humidity (RH) were set to identify SI events at LABS. Accordingly, 3.0% of the observation period was impacted by SI leading to a net O-3 enhancement of 14.6 +/- 9.6 ppb at LABS. Factors influencing the two most common SI event types affecting LABS, i.e. tropopause folds (major) and tropical cyclones (minor), were discussed. We utilized ERA5 reanalysis products (meteorology and O-3) to trace and analyze the pathway and mechanism of these SI types over sub-tropical East Asia. With a conceptual model, we illustrate two driving circulations for SI air at similar to 200 hPa that affect subtropical East Asia. SI air generated due to Rossby wave breaks are transported equatorward and downward into the troposphere. The southern westerlies passing south of the Tibetan Plateau can further push the SI air eastward. A SI event in 2007 with a significant O-3 enhancement of 43.4 ppb caused by typhoon Nari was detected and discussed to depict the second SI type.

引用

页数：11