生物质燃烧在热带高臭氧/低水汽结构中具有普遍作用。

A pervasive role for biomass burning in tropical high ozone/low water structures.

作者信息

Anderson Daniel C, Nicely Julie M, Salawitch Ross J, Canty Timothy P, Dickerson Russell R, Hanisco Thomas F, Wolfe Glenn M, Apel Eric C, Atlas Elliot, Bannan Thomas, Bauguitte Stephane, Blake Nicola J, Bresch James F, Campos Teresa L, Carpenter Lucy J, Cohen Mark D, Evans Mathew, Fernandez Rafael P, Kahn Brian H, Kinnison Douglas E, Hall Samuel R, Harris Neil R P, Hornbrook Rebecca S, Lamarque Jean-Francois, Le Breton Michael, Lee James D, Percival Carl, Pfister Leonhard, Pierce R Bradley, Riemer Daniel D, Saiz-Lopez Alfonso, Stunder Barbara J B, Thompson Anne M, Ullmann Kirk, Vaughan Adam, Weinheimer Andrew J

机构信息

Department of Atmospheric and Oceanic Science, University of Maryland, College Park, Maryland 20742, USA.

Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA.

出版信息

Nat Commun. 2016 Jan 13;7:10267. doi: 10.1038/ncomms10267.

DOI:10.1038/ncomms10267

PMID:26758808

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4735513/

Abstract

Air parcels with mixing ratios of high O3 and low H2O (HOLW) are common features in the tropical western Pacific (TWP) mid-troposphere (300-700 hPa). Here, using data collected during aircraft sampling of the TWP in winter 2014, we find strong, positive correlations of O3 with multiple biomass burning tracers in these HOLW structures. Ozone levels in these structures are about a factor of three larger than background. Models, satellite data and aircraft observations are used to show fires in tropical Africa and Southeast Asia are the dominant source of high O3 and that low H2O results from large-scale descent within the tropical troposphere. Previous explanations that attribute HOLW structures to transport from the stratosphere or mid-latitude troposphere are inconsistent with our observations. This study suggest a larger role for biomass burning in the radiative forcing of climate in the remote TWP than is commonly appreciated.

摘要

臭氧混合比高且水汽含量低的气块（HOLW）是热带西太平洋（TWP）对流层中层（300 - 700百帕）的常见特征。在此，利用2014年冬季在TWP进行飞机采样期间收集的数据，我们发现在这些HOLW结构中，臭氧与多种生物质燃烧示踪剂之间存在强烈的正相关关系。这些结构中的臭氧水平比背景值大约高三倍。利用模型、卫星数据和飞机观测结果表明，热带非洲和东南亚的火灾是高臭氧的主要来源，而低水汽是热带对流层内大规模下沉的结果。以往将HOLW结构归因于平流层或中纬度对流层输送的解释与我们的观测结果不一致。这项研究表明，生物质燃烧在偏远TWP地区气候辐射强迫中所起的作用比通常认为的更大。