基于非参数统计方法估算青藏高原臭氧背景浓度

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Abstract The atmospheric background concentration can reflect the degree of pollution and long-term trends on a regional scale. This work was based on the Kolmogorov-Zurbenko (KZ) filtering and Robust Extraction of Baseline Signal (REBS) methods and processed multiple years of continuous near-surface ozone raw observational data from Nam Co Station and Qomolangma Station on the Tibetan Plateau. By optimizing the KZ filter and REBS filtering window and bandwidth, short-term fluctuations in the ozone time series were successfully removed, and signals representing the background concentration of near-surface ozone at both stations were extracted. The results showed that the annual average background ozone concentrations at Nam Co Station and Qomolangma Station were 89.71μg/m³ and 88.98μg/m³ respectively according to the KZ filtering method, and 89.62μg/m³ and 88.52μg/m³ respectively according to the REBS method. The background ozone concentrations obtained by both methods demonstrated good consistency and exhibited similar seasonal variation patterns. The ozone concentration was higher in April-May and lower during the monsoon period. KZ filtering focused more on reflecting long-term trends and seasonal cyclical changes, while REBS performed better during local pollution periods. Both non-parametric statistical methods were effectively applied to the analysis of ozone time series in background regions, providing an important basis for monitoring and controlling ozone pollution.

Key words： ozone background concentration Kolmogorov-Zurbenko filter Robust Extraction of Baseline Signal Tibetan Plateau

Received: 27 January 2024

PACS:

X511

Corresponding Authors: 丛志远,教授,czy@utibet.edu.cn E-mail: czy@utibet.edu.cn

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	XIE Min-sheng
	JI Dong-sheng
	YIN Xiu-feng
	XIN Jin-yuan
	WAN Xin
	LI Jian-jun
	ZHANG Qiang-gong
	BU Duo
	CONG Zhi-yuan

Cite this article:

XIE Min-sheng,JI Dong-sheng,YIN Xiu-feng等. Estimation of ozone background concentration on the Tibetan Plateau based on nonparametric statistical technique[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(8): 4274-4281.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I8/4274

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