The madden-julian oscillation modulates the air quality in the maritime continent

Kuwata, Mikinori and Miyakawa, Takuma and Yokoi, Satoru and Khan, Md Firoz and Latif, Mohd Talib (2021) The madden-julian oscillation modulates the air quality in the maritime continent. Earth And Space Science, 8 (7). ISSN 2333-5084, DOI

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Air quality in the Maritime Continent, which worsens particularly during peatland fire periods, causes climate and environmental concerns. The occurrence of peatland fire haze has been related to the interannual variations of the El Nino-Southern Oscillation, Indian Ocean Dipole, and inter-seasonal monsoon cycle. However, the factors affecting the region's air quality on subseasonal timescales have not been clearly identified. We investigated the role of the Madden-Julian Oscillation (MJO), which has a 30-90-day cycle, in air quality using a long-term observation data set from Malaysia. The results show that in MJO Phase 3, during which the region is covered by convective clouds, only accounted for 4 +/- 2% of high PM10 concentration days (daily average PM10 concentration at site X > average + standard deviation of daily average PM10 concentration at site X) among all active MJO periods. In contrast, the corresponding values were considerably higher in MJO Phases 1 and 5-8. The MJO also modulated CO and ozone concentrations. This study shows that the MJO influences air quality during both fire and non-fire seasons, demonstrating that variations in wildfire activity are not the only cause of air quality changes. Other factors, such as precipitation, also need to be considered to better understand the relationship between the MJO and air quality.

Item Type: Article
Funders: Research Institute for Humanity and Nature (RIHN) [14200117], Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) Japan Society for the Promotion of Science [JP16K05560], Japan Society for the Promotion of Science (JSPS) [JP16H04048]
Uncontrolled Keywords: Madden-Julian Oscillation; Particulate matter; Carbon monoxide; Ozone
Subjects: Q Science > Q Science (General)
Q Science > QD Chemistry
Divisions: Faculty of Science > Department of Chemistry
Depositing User: Ms Zaharah Ramly
Date Deposited: 25 Jul 2022 04:49
Last Modified: 25 Jul 2022 04:49

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