Convective and wave signatures in ozone profiles over the equatorial Americas: Views from TC4 2007 and SHADOZ

During the TC4 (Tropical Composition, Clouds, and Climate Coupling) campaign in
9 July–August 2007, daily ozonesondes were launched over coastal Las Tablas, Panamá
10 (7.8°N, 80°W) and several times per week at Alajuela, Costa Rica (10°N, 84°W). Wave
11 activity, detected most prominently in 100–300 m thick ozone laminae in the tropical
12 tropopause layer, occurred in 50% (Las Tablas) and 40% (Alajuela) of the soundings.
13 These layers, associated with vertical displacements and classified as gravity waves (GW,
14 possibly Kelvin waves) by laminar identification, occur with similar structure and
15 frequency over the Paramaribo (5.8°N, 55°W) and San Cristóbal (0.92°S, 90°W) Southern
16 Hemisphere additional ozonesondes (SHADOZ) sites. GW‐labeled laminae in individual
17 soundings correspond to cloud outflow as indicated by DC‐8 tracers and other aircraft
18 data, confirming convective initiation of equatorial waves. Layers representing quasi‐
19 horizontal displacements, referred to as Rossby waves by the laminar technique, are robust
20 features in soundings from 23 July to 5 August. The features associated with Rossby
21 waves correspond to extratropical influence, possibly stratospheric, and sometimes to
22 pollution transport. Comparison of Las Tablas and Alajuela ozone budgets with 1999–
23 2007 Paramaribo and San Cristóbal soundings shows that TC4 is typical of climatology for
24 the equatorial Americas. Overall during TC4, convection and associated waves appear
25 to dominate ozone transport in the tropical tropopause layer; intrusions from the
26 extratropics occur throughout the free troposphere.