期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 817, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2021.152776
关键词
Ozone; Tibetan Plateau; Ozone valley; Box model
资金
- National Natural Science Foundation of China [91837311, 42075054, 91737102]
This paper investigates the formation mechanism of the ozone valley in the upper stratosphere over the Tibetan Plateau. The results suggest that the different distributions of NO2 during the day and night, as well as the temperature difference between the Tibetan Plateau and other regions at the same latitude, may contribute to the diurnal and nighttime variation of the ozone valley.
The ozone valley (OV) in the upper troposphere-lower stratosphere (UTLS) over the Tibetan Plateau (TP) has been identified since the 1990s during boreal summer. Recent studies have shown that another upper core of the OV appeared in the middle and upper stratosphere (10-2 hPa); however, the formation mechanism of the OV in the upper stratosphere remains unclear. In this paper, Microwave Limb Sounder (MLS) data from the Aura satellite and the stratospheric heterogeneous chemical reaction box model are used to investigate the impact of chemical substances, including NO, NO2, Cl and Br, on the ozone valley in the middle and upper stratosphere over the TP. The results show that the formation mechanism of the diurnal and nighttime variation in the upper core of the OV over the TP in the summer may be related to the different daytime and nighttime distributions of NO2 and the difference in daytime and nighttime average temperatures between the TP and the same latitude regions.
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