. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 136 E. AUGSTEIN ET AL. of the boundary layer can be found, based on the temperature and humidity profiles. The variation of the boundary-layer structure in relation to convection could be observed in more detail during ATEX. From the 'Discoverer' and 'Planet' profiles in Figure 4, one may conclude that in the tradewind area, changes from period one to period two in the vertical distribution of temperature and water vapor were rather height [m].
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 136 E. AUGSTEIN ET AL. of the boundary layer can be found, based on the temperature and humidity profiles. The variation of the boundary-layer structure in relation to convection could be observed in more detail during ATEX. From the 'Discoverer' and 'Planet' profiles in Figure 4, one may conclude that in the tradewind area, changes from period one to period two in the vertical distribution of temperature and water vapor were rather height [m]. LT 14° 32' N / 19° 2' W 1741 LT 14° 36' N/ 18°21'W wb LT 14° 33' N/17" 37' W Fig. 5. Tethered balloon profiles of dry- and wetbulb temperature on an east-west cross-section at the African coast near Dakar. small in spite of the large-scale weather changes. But at 'Meteor' where convection increased during the second phase, distinct differences in the profiles for the two pe- riods can be seen. Here, the trade inversion was not observed in about 40% of the soundings between 13 and 17 February. Therefore, the measurements of this period have been divided further into those with an inversion (dash-dotted) and those without (dashed). Generally, we find an increase of temperature and specific humidity in the entire layer in the second period. At the 'Discoverer' and 'Planet', the transition layer did not move vertically at all while the inversion layer moved downward in the second period (see Figure 4). At the 'Meteor', the transition layer migrated downward and the inversion upward during the second period. This indicates an increase of the depth of the cloud layer with increasing convective activity. And the further downward migration of the transition layer and the destruction of the trade inversion in the dashed profiles (Figure 4) seems to be due to an additional increase of cumulus con- vection. Although the lifting condensation
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