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


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.

SUBMITTER: Anderson DC 

PROVIDER: S-EPMC4735513 | biostudies-literature | 2016 Jan

REPOSITORIES: biostudies-literature

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

Anderson Daniel C DC   Nicely Julie M JM   Salawitch Ross J RJ   Canty Timothy P TP   Dickerson Russell R RR   Hanisco Thomas F TF   Wolfe Glenn M GM   Apel Eric C EC   Atlas Elliot E   Bannan Thomas T   Bauguitte Stephane S   Blake Nicola J NJ   Bresch James F JF   Campos Teresa L TL   Carpenter Lucy J LJ   Cohen Mark D MD   Evans Mathew M   Fernandez Rafael P RP   Kahn Brian H BH   Kinnison Douglas E DE   Hall Samuel R SR   Harris Neil R P NR   Hornbrook Rebecca S RS   Lamarque Jean-Francois JF   Le Breton Michael M   Lee James D JD   Percival Carl C   Pfister Leonhard L   Pierce R Bradley RB   Riemer Daniel D DD   Saiz-Lopez Alfonso A   Stunder Barbara J B BJ   Thompson Anne M AM   Ullmann Kirk K   Vaughan Adam A   Weinheimer Andrew J AJ  

Nature communications 20160113


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 tro  ...[more]

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