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Título

Bimodal distribution of free tropospheric ozone over the tropical western Pacific revealed by airborne observations

AutorPan, L.L.; Honomichl, S.B.; Randel, W.J.; Apel, E.C.; Atlas, E.L.; Beaton, S.P.; Bresch, J.F.; Hornbrook, R.; Kinnison, D.E.; Lamarque, J.F.; Saiz-Lopez, A. ; Salawitch, R.J.; Weinheimer, A.J.
Fecha de publicación2015
EditorAmerican Geophysical Union
CitaciónGeophysical Research Letters 42: 7844- 7851 (2015)
ResumenA recent airborne field campaign over the remote western Pacific obtained the first intensive in situ ozone sampling over the warm pool region from oceanic surface to 15-km altitude (near 360-K potential temperature level). The new data set quantifies ozone in the tropical tropopause layer under significant influence of convective outflow. The analysis further reveals a bimodal distribution of free tropospheric ozone mixing ratio. A primary mode, narrowly distributed around 20-ppbv, dominates the troposphere from the surface to 15-km. A secondary mode, broadly distributed with a 60-ppbv modal value, is prominent between 3 and 8-km (320-K to 340-K potential temperature levels). The latter mode occurs as persistent layers of ozone-rich drier air and is characterized by relative humidity under 45%. Possible controlling mechanisms are discussed. These findings provide new insight into the physical interpretation of the >S>-shaped mean ozone profiles in the tropics.
URIhttp://hdl.handle.net/10261/141447
DOI10.1002/2015GL065562
Identificadoresdoi: 10.1002/2015GL065562
issn: 1944-8007
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