Abstract

Trans-Pacific transport of enhanced ozone plumes has been mainly attributed to fossil fuel combustion in Asia in spring, but less attention has been paid to vegetation fires in Asia. Here we show that the El Niño-Southern Oscillation (ENSO)-modulated fires in Southeast Asia, rather than Asian fossil fuel plumes, dominate the interannual variability of springtime trans-Pacific transport of ozone across the entire North Pacific Ocean. During El Niño springs, the intensified fires from both the Indochinese Peninsula and Indonesia, together with large-scale circulation anomalies, result in enhanced ozone plumes that stretch over 15 000 km in both the lower-middle and upper troposphere. This enhancement is also observed in the in situ measurements of ozone concentration, with an almost 10% increase at Mauna Loa Observatory, Hawaii, a unique site to monitor the long-distance transport over the North Pacific. This study reports an unexpectedly strong influence of vegetation fires, linked with climate variability, on global tropospheric chemistry and proves once more how complex the interactions in the climate system are.

中文翻译：

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ENSO 和东南亚生物质燃烧调节亚热带跨太平洋臭氧输送

 抽象的

臭氧羽流的跨太平洋输送主要归因于亚洲春季化石燃料的燃烧，但对亚洲植被火灾的关注较少。在这里，我们表明，厄尔尼诺南方涛动（ENSO）调节的东南亚火灾，而不是亚洲化石燃料羽流，主导了整个北太平洋春季跨太平洋臭氧输送的年际变化。厄尔尼诺现象春季期间，印度支那半岛和印度尼西亚的大火加剧，加上大规模的环流异常，导致对流层中下层和上层的臭氧羽流增​​强，延伸超过15 000公里。这种增强也可以在臭氧浓度的现场测量中观察到，夏威夷莫纳罗亚天文台的臭氧浓度增加了近 10%，该天文台是监测北太平洋长距离运输的独特地点。这项研究报告了与气候变化有关的植被火灾对全球对流层化学的意外强烈影响，并再次证明了气候系统中相互作用的复杂性。